CN104901893B - Flux of multicast guard method and device - Google Patents
Flux of multicast guard method and device Download PDFInfo
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- CN104901893B CN104901893B CN201510319817.XA CN201510319817A CN104901893B CN 104901893 B CN104901893 B CN 104901893B CN 201510319817 A CN201510319817 A CN 201510319817A CN 104901893 B CN104901893 B CN 104901893B
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Abstract
The application proposes flux of multicast guard method and device.Method includes：Any node in PIM SM networks receives join messages, determine to be provided with MoDP application marks in the message, and bifurcated mark set, then, if being provided with main path in join messages to mark, for main path generation PIM list items, MRIB list items and MFIB list items；If standby path tag is provided with join messages, for the standby coordinates measurement PIM list items and MRIB list items；After the completion of being established when the active and standby path, when the node receives the first two-way converting of multicast detection BFD messages that bifurcated tail node is sent along the main path, the first BFD messages of multicast are forwarded according to the MFIB list items；When the node receives the 2nd BFD messages of unicast that bifurcated first node is sent along the standby path, the 2nd BFD messages of unicast are forwarded according to the unicast forwarding list item itself preserved.The application saves the bandwidth consumed during flux of multicast protection.
Description
Technical field
This application involves technical field of multicast, more particularly to flux of multicast guard method and device.
Background technology
With developing rapidly for audio frequency and video business, the application of multicast is extensive all the more.But realizing for multicast is complex,
Trail protection and when being switched fast there are larger difficulty, using being above restricted.
PIM-SM (Protocol Independent Multicast-Sparse Mode, unrelated group of sparse mode protocol
Broadcast) agreement uses " draw (Pull) pattern " transmission multicast packet, be commonly available to multicast member distribution relative distribution, scope compared with
Wide large and medium-sized network.
The basic principle of PIM-SM is as follows：
PIM-SM assumes that receiving multicast data is all not required in All hosts, and the host of multicast packet is only needed to clearly proposition
Forwarding.PIM-SM realizes that the core missions of multicast forwarding are exactly to construct and safeguard that (Rendezvous Point Tree, share RPT
Tree or sink tree), as common root node RP, (Rendezvous Point, collect certain router in RPT selections PIM domains
Point), multicast packet is transmitted to recipient by RP along RPT；
The router for connecting recipient joins message (Join Message) to the corresponding RP transmissions of certain multicast group, the message
RP is sent to by hop-by-hop, paths traversed is formed the branch of RPT；
If multicast source will send multicast packet to certain multicast group, first by multicast source DR (Designated
Router, Designated Router) it is responsible for being registered to RP, logon message (Register Message) is sent out by mode of unicast
RP is given, is triggered after message arrival RP and establishes SPT (Shortest Path Tree, shortest path tree).Multicast source will afterwards
Multicast packet is sent to RP along SPT, after multicast packet reaches RP, is replicated and is sent to recipient along RPT.
When recipient side DR has found that being sent to the multicast packet speed of multicast group G from RP has exceeded certain threshold value, will send out
The switching from RPT to SPT is played, process is as follows：First, recipient side DR sends (S, G) to multicast source S hop-by-hops and joins message, and
Multicast source DR finally is sent to, the all-router passed through on the way all generates (S, G) list item in its forwarding table, so as to establish
SPT branches；Then, recipient side DR sends beta pruning (Prune) message for including RP to RP hop-by-hops, after RP receives the message
Can continue to send prune packet (assuming that at this time only have this recipient) to multicast source direction, thus finally realize from RPT to
The switching of SPT.After RRT is switched to SPT, multicast packet directly will be sent to recipient from multicast source.
MOFRR (Multicast Over Fast ReRoute, the quick heavy-route of multicast) is to multicast in recipient side DR
Source initiates two parts and joins message, and is sent to active and standby next-hop respectively.Multicast source receive 2 parts join message after establish multicast list,
Multicast data flow is forwarded to recipient side DR from 2 SPT paths at the same time, and recipient side DR passes through RPF (Reverse Path
Forwarding, reverse path forwarding) check the flow for abandoning not preferred next-hop.The former preferable next-hop when network failure
Route table items are deleted, then backup next-hop is upgraded to main next-hop, and flow is able to be forwarded to recipient.
The content of the invention
The embodiment of the present application provides flux of multicast guard method and device.
What the technical solution of the application was realized in：
A kind of flux of multicast guard method, this method include：
Any node in PIM-SM networks receives the join messages for multicast group, determines to set in the join messages
Put the quick heavy-route MoDP applications mark of multicast based on diverging paths, and bifurcated mark set, then,
Marked if being provided with main path in the join messages, main path generation PIM list items for the multicast group,
Multicast Routing information bank MRIB list items and multicast forwarding information bank MFIB list items；
If standby path tag is provided with the join messages, for the standby coordinates measurement PIM list items of the multicast group
With MRIB list items；
After the completion of being established when the active and standby path, the node receives the tail nodes of the diverging paths along the master
When the first two-way converting of multicast for the multicast group that path is sent detects BFD messages, forwarded according to the MFIB list items
The first BFD messages of multicast；
The first node that the node receives the diverging paths is sent to the periprocts of the diverging paths along the standby path
During the 2nd BFD messages of unicast of point, the 2nd BFD messages of unicast are forwarded according to the unicast forwarding list item itself preserved.
A kind of flux of multicast protective device, on the node in PIM-SM networks, which includes：
Multicast list maintenance module：The join messages for multicast group are received, determine to be provided with the join messages
The quick heavy-route MoDP applications mark of multicast based on diverging paths, and bifurcated mark set, then, if being set in the join messages
Main path mark is put, then for main path generation PIM list items, Multicast Routing information bank MRIB list items and the group of the multicast group
Broadcast forwarding information storehouse MFIB list items；If standby path tag is provided with the join messages, for the standby road of the multicast group
Footpath generates PIM list items and MRIB list items；
BFD modules：After the completion of being established when the active and standby path, the tail nodes of the diverging paths is received along the master
When the first two-way converting of multicast for the multicast group that path is sent detects BFD messages, forwarded according to the MFIB list items
The first BFD messages of multicast；The first node for receiving the diverging paths is sent to the diverging paths along the standby path
During the 2nd BFD messages of unicast of tail node, the 2nd BFD messages of unicast are forwarded according to the unicast forwarding list item itself preserved.
As it can be seen that multicast forwarding is only generated on main path when generating active and standby path for multicast group in the embodiment of the present application
List item, so that flux of multicast only forwards on the paths in main or standby path, saves bandwidth；Based on established active and standby
Path, by multicast BFD packet check main path states, by unicast BFD packet checks for path status, based on the detection machine
System, it is possible to achieve during link failure, the protection to flux of multicast..
Brief description of the drawings
Fig. 1 is the flux of multicast guard method flow chart that one embodiment of the application provides；
Fig. 2 is the active and standby path establishment method flow chart in the flux of multicast protection that one embodiment of the application provides；
Fig. 3 is the exemplary networking diagram of application of the application；
Fig. 4 is the path switching method flow chart in flux of multicast provided by the embodiments of the present application protection；
Fig. 5 is the PIM join message formats that RFC4601 is defined；
Fig. 6 is extended example of the embodiment of the present application to join messages shown in Fig. 6；
Fig. 7 is the composition schematic diagram for the flux of multicast protective device that one embodiment of the application provides.
Embodiment
Applicant carries out analysis to existing MOFRR methods and finds：
MOFRR is substantially exactly to establish SPT trees respectively from 2 upstream networks, and flow draws to get off at the same time from active-standby path, its
There are following defect：
One) existing MOFRR cannot substantially be known as " quick heavy-route ", and be " redundancy route ", that is, pass through two sets
Independent network drains at the same time, loses a flow in receiving terminal, wastes bandwidth；
Two) existing MOFRR lacks dynamic detection mechanism, and node failure causes do not have safeguard measure during cutout.
To solve the above-mentioned problems, the application provides following solution, and below in conjunction with the accompanying drawings and specific embodiment is to this
Application is described in further detail.
Fig. 1 is the flux of multicast guard method flow chart that one embodiment of the application provides, it is comprised the following steps that：
Step 101：Any node in PIM-SM networks receives the join messages for multicast group, determines in the message
There is provided MoDP, (Multicast over Divergent Path Fast ReRout, the multicast based on diverging paths quickly weigh
Route application) mark, and bifurcated mark set, then, marked if being provided with main path in join messages, for the multicast group
Main path generation PIM list items, MRIB (Multicast Routing Information Base, Multicast Routing information bank) table
Item and MFIB (Multicast Forwarding Information Base, multicast forwarding information bank) list item；If join messages
In be provided with standby path tag, then for standby the coordinates measurement PIM list items and MRIB list items of the multicast group.
Step 102：After the completion of being established when the active and standby path, the node receives the tail node of the diverging paths
The first BFD (Bidirectional of multicast for the multicast group that (abbreviation bifurcated tail node) is sent along the main path
Forwarding Detection, two-way converting detection) message when, the first BFD messages are forwarded according to the MFIB list items；
The first node (abbreviation bifurcated first node) for receiving diverging paths is sent to along the standby path tail node of the diverging paths
During the 2nd BFD messages of unicast, the 2nd BFD messages of unicast are forwarded according to the unicast forwarding list item itself preserved.
In step 101, for the laggard of the main path generation PIM list items of the multicast group, MRIB list items and MFIB list items
One step includes：If itself not generating the PIM list items and MRIB list items in the standby path for the multicast group, confirm itself for institute
The bifurcated intermediate node of multicast group is stated, the join messages are directly sent to multicast source；Otherwise, confirm itself for the multicast group
Bifurcated tail node, multicast source is sent to after which is converted into common join messages；
Further comprise afterwards for standby the coordinates measurement PIM list items and MRIB list items of the multicast group：If itself does not give birth to
Into the PIM list items, MRIB list items and MFIB list items of the main path for the multicast group, then confirm itself for the multicast group
Bifurcated intermediate node, is directly sent to multicast source by the join messages；Otherwise, the bifurcated periproct that itself is the multicast group is confirmed
Point, multicast source is sent to after which is converted into common join messages.
The node is the tail node of the diverging paths, after receiving the 2nd BFD messages of unicast, and, the section
Point is the first node of the diverging paths, after receiving the first BFD messages of multicast, the tail node of the diverging paths and institute
State the BFD session establishments between the first node of diverging paths.
After the BFD session establishments, the node be diverging paths first node when, detect on the main path with
When BFD session ratios between the tail node of the diverging paths are less than predetermined threshold value, the main path failure is determined, and send
Carry the 3rd BFD messages of unicast of BFD sessions Down marks；
The node is the tail node of the diverging paths, when receiving the 3rd BFD messages of unicast, confirms the master
Path failure, MFIB list items are generated for the standby path for the multicast group, and send multicast datagram along the standby path
Text；
The node is the intermediate node of the diverging paths, when receiving the multicast data message, for described standby
Path generates MFIB list items for the multicast group, and forwards the multicast data message according to the MFIB list items of generation.
After the main path failure, the node be diverging paths first node when, detect on the main path with
When BFD session ratios between the tail node of the diverging paths are equal to or higher than predetermined threshold value, the main path failure is confirmed
Recover, the 4th BFD of the unicast reports for carrying BFD sessions Up marks are sent along the standby path to the tail node of the diverging paths
Text, and start timer, in timer to constantly, the join reports for carrying main path recovery mark are sent along the standby path
Text；
When the tail node of intermediate node or the diverging paths that the node is the diverging paths, the node connects
Receive the join messages that the carrying main path recovers mark, and will the corresponding MFIB list items deletion in the standby path.
Here BFD session ratios refer to the number of received BFD messages in each detection cycle, such as：Bifurcated is first
Node is equal to or more than predetermined threshold value in a detection cycle from the number of the received first BFD messages of main path, then it is assumed that
Main path is normal；Otherwise it is assumed that main path failure.
Before any node receives the addition join messages for multicast group, when the node is the bifurcated road
During the first node in footpath, the unicast forwarding list item of multicast source is arrived according to this node, is selected most in multiple next-hops to multicast source
The excellent and next-hop of suboptimum；
Set main path to mark in the join messages for be sent to optimal next-hop, be sent to the join messages of suboptimum next-hop
It is middle that standby path tag is set, while for main path generation PIM list items, MRIB list items and MFIB list items, for described standby
Coordinates measurement PIM list items and MRIB list items.
After the completion of the active and standby path is established, when the node is the first node of the diverging paths, the node connects
Receive join messages；
If the bifurcated mark set in the join messages received, deletes the PIM that itself is directed to the active and standby path
List item, MRIB list items and MFIB list items, and respectively beta pruning prune messages are sent along the active and standby path；
When the node is the middle node or tail node of the diverging paths, the prune messages are received, and then delete
Itself is directed to PIM list items, MRIB list items and the MFIB list items in the active and standby path.
When selecting optimal next-hop and suboptimum next-hop, and generally use LPM (Longest Prefix Matching, most
Long prefix matching) method, i.e., the next-hop with the most matched route of prefix of multicast source is optimal next-hop, before multicast source
The next-hop for sewing time matched route is suboptimum next-hop.
After the completion of the active and standby path is established, bifurcated first node finds that itself changes to the singlecast router of multicast source,
Then when receiving the join messages that downstream node is sent, return and perform the unicast forwarding table that multicast source is arrived according to this node
, the optimal and next-hop of suboptimum action is selected in multiple next-hops to multicast source, according to new singlecast router, to build
Stand new active and standby path.
In one embodiment of the application, what any node in PIM-SM networks received that downstream node sends is directed to a multicast
The join messages of group, if finding itself to have generated the PIM list items, MRIB list items and MFIB tables for the main path of the multicast group
, or the PIM list items and MRIB list items in the standby path for the multicast group have been generated, and itself be not point of the multicast group
First node or bifurcated tail node are pitched, and the downstream node is not located on the master or standby path of the multicast group, then directly by the join
Message forwards.This is allowed for：Any two groups of active and standby paths cannot be overlapping, and even there are two groups of active and standby paths：Path
A, B (backup each other and form a ring 1), path C, D (backup each other and form a ring 2), then ring 1, ring 2 cannot intersect,
Therefore, after path A, B (i.e. ring 1) foundation, after the intermediate node on ring 1 receives the join messages outside ring again, directly forwarding is
Can (even if oneself meets the condition as bifurcated first node, also no longer bifurcated), intersect to avoid another is established again with ring 1
Ring.
Fig. 2 is the active and standby path establishment method flow chart in the flux of multicast protection that one embodiment of the application provides, it has
Body step is as follows：
Step 200：MoDP is enabled on all nodes in the PIM-SM networks of single-point connection.
Single-point connection PIM-SM networks i.e., for each routing node in PIM-SM networks, for the same network segment
An only PIM neighbours.
Step 201：Any upstream node in PIM-SM networks receive that downstream node sends for a multicast group
Join messages, find the message be not provided with MoDP application mark, and the singlecast router in this node to multicast source direction have it is multiple under
One jumps, then it is bifurcated first node to confirm this node, and optimal and suboptimum next-hop is selected in multiple next-hops.
In addition, bifurcated first node can also be pre-configured with by webmaster etc. according to the networking situation of PIM-SM networks, in this way, working as
Any upstream node in PIM-SM networks receive that downstream node sends for a multicast group join messages when, if finding
Bifurcated first node itself is configured as, then is selected in multiple next-hops of this node to multicast source direction under optimal and suboptimum
One jumps.
Step 202：Bifurcated first node replicates join messages, obtains two parts of join messages, in two parts of join messages all
MoDP application marks are set, and the bifurcated of two parts of join messages is marked into set, one's duty is set in two parts of join messages
The IP address (IP address for leading to the uplink port of the optimal next-hop of multicast source i.e. in bifurcated first node) of first node is pitched, is being sent out
Set main path to mark into the join messages of optimal next-hop, standby path is set in the join messages for be sent to suboptimum next-hop
Mark, while for main path generation PIM list items, MRIB (the Multicast Routing Information of the multicast group
Base, Multicast Routing information bank) list item and MFIB (Multicast Forwarding Information Base, multicast forwarding
Information bank) list item, for standby the coordinates measurement PIM list items and MRIB list items of the multicast group.
The content of PIM list items mainly includes：Multicast source S addresses, multicast group G addresses, main path or the upstream end for path
Mouth and downstream port, the content of MRIB and MFIB list items mainly include：Multicast source S addresses, multicast group G addresses, main path or standby
The downstream port in path.
MFIB list items are generated according to PIM and MRIB list items.For multicast group main path generate PIM, MRIB and
During MFIB list items, the downstream port (i.e. the inbound port of join messages) of main path is added to PIM, MRIB and MFIB list item
In, while set " master " to mark on the downstream port of the main path in PIM list items.
When for standby the coordinates measurement PIM and MRIB list items of multicast group, only by the downstream port in standby path, (i.e. join is reported
The inbound port of text) be added in PIM list items, and be not added in MRIB list items, at the same in PIM list items this for path downstream
" standby " mark is set on port.
Node in multicast data forwarding message, is forwarded according to MFIB list items.
Step 203：Upstream node in PIM-SM networks receives the join for a multicast group that downstream node is sent
Message, finds to be provided with MoDP application marks in the message, and bifurcated mark set, then, if being provided with main road in join messages
Footpath marks, then generates PIM, MRIB and MFIB list item for the main path of the multicast group；If standby path is provided with join messages
Mark, then for standby coordinates measurement PIM, MRIB list item of the multicast group.
For the detailed process of main path generation PIM, MRIB and MFIB list item of the multicast group, and for the multicast group
Standby coordinates measurement PIM, MRIB list item detailed process it is identical with step 202.
Step 204：The upstream node judges itself whether generated the PIM list items in the standby path for the multicast group, or
Person judges itself whether generated the PIM list items for the main path of the multicast group, if so, performing step 206；Otherwise, perform
Step 205.
The PIM list items that the upstream node judges itself whether to have generated for the standby path of the multicast group are specially：Certainly
Body searches the corresponding PIM list items of the multicast group, if finding to be provided with " standby " mark on the downstream port of the PIM list items, it is determined that
The PIM list items in the standby path for the multicast group itself are generated.
The PIM list items that the upstream node judges itself whether to have generated for the main path of the multicast group are specially：Certainly
Body searches the corresponding PIM list items of the multicast group, if finding, " master " is provided with the downstream port of the PIM list items to be marked, it is determined that
The PIM list items for the main path of the multicast group itself are generated.
Step 205：The upstream node confirms the bifurcated intermediate node or bifurcated tail node that this node is the multicast group, then
The join messages are sent to multicast source, go to step 207.
Step 206：The upstream node confirms the bifurcated tail node that this node is the multicast group, then changes the join messages
To be sent to multicast source after common join messages.
Common join messages i.e., meet join messages as defined in existing PIM agreements, this Shen are not provided with common join messages
MoDP applications mark that please be in embodiment, bifurcated mark, active/standby path tag etc..
As it can be seen that for bifurcated tail node, main or standby path tag is provided with for a multicast group when it is first received
Join messages (while there is provided MoDP application mark and bifurcated mark set) when, its processing is：Foundation is directed to Zhu Huobei roads
The related multicast list item in footpath, and join messages are continued to be sent to multicast source (MoDP applications mark, bifurcated mark in join messages
Note, active/standby path tag all retain as former state)；When hereafter it have received standby or main path mark is provided with for the multicast group
Join messages (while there is provided MoDP application mark and bifurcated mark set) when, find itself to have generated for the multicast
During the related multicast list item in the master of group or standby path, then the bifurcated tail node that this node is the multicast group is confirmed, at this time, except building
It is vertical to be directed to outside standby or main path related multicast list item, multicast is sent to again after join messages also are converted into common join messages
Source.
For the upstream node of bifurcated tail node, when the upstream node receives being provided with from bifurcated tail node
When MoDP applications mark and bifurcated mark set and the join messages there is provided main or standby path tag, the multicast group has been learnt
Through bifurcated, even if then itself possessing the attribute of bifurcated first node, also no longer bifurcated, only generates related multicast according to the join messages
List item；
When the upstream node receives the common join messages from bifurcated tail node, if then itself possessing bifurcated first node
Attribute (i.e. this node to multicast source has multiple next-hops), then held as depicted at step 201 using this node as bifurcated first node
The processing of row step 201~202, next group of active/standby path of the multicast group occur.
That is, being directed to same multicast group, there can be multigroup active/standby path, but the different active/standby paths of group cannot hand over
Fork.
Furthermore, it is contemplated that：Bifurcated tail node is probably the bifurcated first node in next group of active/standby path of the multicast group, then
In step 206, before which is converted to common join messages by bifurcated tail node, also to judge oneself whether be
New bifurcated first node, that is, judge：Whether this node has multiple next-hops to multicast source direction, if so, then as depicted at step 201
Using this node as bifurcated first node, the processing of step 201~202 is performed, next group of active/standby path of the multicast group occurs
.
Step 207：Node in PIM-SM networks receives the multicast data message from multicast source, according in the message
Multicast source S addresses and multicast group G addresses, corresponding MFIB list items itself are being found, according to the downstream port of MFIB list items
The multicast data packet forwarding is gone out.
Fig. 3 is the exemplary networking diagram of application of the application, then the active and standby path of multicast group to establish process as follows：
1) the interchanger SW8 as DR receives the join messages for a multicast group G that host Host3 is sent, and finding should
MoDP application marks are not provided with message, and itself singlecast router to multicast source direction there are multiple next-hops, then confirms itself
For the bifurcated first node of multicast group G, selected in itself multiple next-hop to multicast source direction optimal and suboptimum next
Jump, wherein, optimal next-hop is directed toward SW7, and suboptimum next-hop is directed toward SW5.
2) bifurcated first node SW8 replicates join messages, and MoDP application marks are all set in two parts of join messages, and will
The bifurcated mark set of two parts of join messages, sets IP address (the i.e. SW8 of this bifurcated first node in two parts of join messages
In the IP address of the upper uplink port towards SW7, SW8 towards SW5 uplink port IP address), be sent to optimal next-hop
Join messages in set main path to mark, standby path tag, same hour hands are set in the join messages for be sent to suboptimum next-hop
To main path generation PIM list items, MRIB list items and the MFIB list items of the multicast group, for the standby coordinates measurement PIM of the multicast group
List item and MRIB list items, are sent to SW7 by the join messages for carrying main path mark, the join messages for carrying standby path tag are sent out
Toward SW5.
3) SW7 receives the join messages for carrying main path mark, then learns that oneself is located on the main path of multicast group G, raw
Into PIM, MRIB and MFIB list item of the main path for multicast group G, which is sent to multicast source direction；
SW5 receives the join messages for carrying standby path tag, then learns that oneself is located on the standby path of multicast group G, generates
For PIM the and MRIB list items in the standby path of multicast group G, which is sent to multicast source direction；
4) SW4 receives the join messages for carrying main path mark, then learns that oneself is located on the main path of multicast group G, raw
Into PIM, MRIB and MFIB list item of the main path for multicast group G, which is sent to multicast source direction；
SW2 receives the join messages for carrying standby path tag, then learns that oneself is located on the standby path of multicast group G, generates
For PIM the and MRIB list items in the standby path of multicast group G, which is sent to multicast source direction；
5) SW1 receives the join messages for carrying main path mark, then learns that oneself is located on the main path of multicast group G, raw
Into PIM, MRIB and MFIB list item of the main path for multicast group G, which is sent to multicast source direction；
Afterwards, SW1 receives the join messages for carrying standby path tag, then learns oneself while positioned at the active and standby of multicast group G
On path, the bifurcated tail node that oneself is multicast group G is confirmed, generation is directed to PIM the and MRIB list items in the standby path of multicast group G,
Multicast source direction is sent to after the join messages are converted to common join messages.
Hereafter, the flux of multicast for the multicast group G that multicast source is sent reaches SW1, and SW1 is according to the MFIB list items of itself, by this
Flux of multicast is transferred to Host3 by SW4, SW7, SW8 successively along the main path of multicast group G.
In the embodiment of the present application, active and standby path is long in order to prevent causes protection switching slower, can preset it is main,
The maximum hop count H in standby pathmax, and by HmaxIt is pre-configured on each node in PIM-SM networks, in step 202, bifurcated is first
Node carries the H fields of the hop count for representing main or standby path in the join messages sent to active and standby path, and by H words
The value of section is arranged to 0, hereafter, after each upstream node receives join messages, the value of H fields will be added to 1, and add 1
If finding afterwards, the value of H fields is equal to Hmax, and join messages are reverted to common join messages is sent to multicast source.
In addition, in the embodiment of the present application, intersect in order to avoid multigroup active/standby path of same multicast group, when established
The master of one multicast group sends for the downstream node that the bifurcated intermediate node on path is received not on this master or standby path
Join messages (being provided with MoDP applications mark or the set of bifurcated mark) for the multicast group when, no longer bifurcated, i.e. no
Judge the attribute (judging whether this node there are multiple next-hops to multicast source) for oneself whether possessing bifurcated first node, but directly
Connect and directly forward join messages according to after join messages generation related multicast list item.
Fig. 4 be flux of multicast provided by the embodiments of the present application protection in path switching method flow chart, its specific steps
It is as follows：
Step 401：Bifurcated tail node (i.e. step after receiving for the join messages in the active and standby path of a multicast group
After the upstream node confirms the bifurcated tail node that this node is the multicast group in 206), start to be directed to the multicast group periodically edge
Main path downstream sends multicast BFD messages, and the source IP address of message is from the IP of the downstream port on the main path
Location, the purpose MAC of message, IP address are respectively the MAC of the multicast group, IP address.
In practical application, if multiple multicast groups correspond to same group of active/standby path, bifurcated tail node need to only be directed to wherein one
A multicast group sends multicast BFD messages.
Step 402：Bifurcated first node receives multicast BFD messages, confirms the bifurcated first node that oneself is the multicast group,
Unicast BFD messages then are sent along the standby path of the multicast group to bifurcated tail node, the purpose IP address of message is reported for multicast BFD
The source IP address of text；Bifurcated first node actively can also send unicast BFD messages to bifurcated tail node.
Step 403：Bifurcated tail node receives unicast BFD messages, BFD session establishments；Bifurcated first node is based on receiving
Multicast BFD message packet check BFD session ratios, if being equal to or higher than predetermined threshold value, then it is assumed that the main road of the multicast group
Footpath is normal；Unicast BFD message packet check BFD session ratio of the bifurcated tail node based on reception, if being equal to or higher than pre- gating
Limit value, then it is assumed that the standby path of the multicast group is normal；The state of the BFD sessions of the multicast group is set for " active and standby path is equal
Active (coming into force) ".
If multiple multicast groups correspond to same group of active/standby path, in this step, bifurcated tail node sets the plurality of multicast group
The states of BFD sessions be all " the active and standby equal active " in path.
In order to avoid multicast BFD messages are sent to useless port, in the embodiment shown in fig. 3, positioned at the main road of the multicast group
Node on footpath (carries MoDP applications mark and bifurcated mark set and takes receiving join messages that downstream node sends
Band main path marks) when, ACL (Access Control List, accesses control list) list item is generated, the content of list item is：Only
Allow the transmission of the multicast BFD messages of the multicast group in the receiving port of the join messages；In this way, in the present embodiment, work as multicast
When BFD messages reach the bifurcated intermediate node of main path, bifurcated intermediate node, only can be by the multicast according to the ACL table item of itself
BFD messages are sent from the downstream port of the main path of the multicast group.
Step 404：When bifurcated first node detects the BFD sessions on the main path of the multicast group between bifurcated tail node
When frequency is less than predetermined threshold value, then BFD sessions Down marks are carried in the unicast BFD messages that this backward bifurcated tail node is sent
Note.
Step 405：Bifurcated tail node receives the unicast BFD messages that bifurcated first node is sent, and finds to carry BFD in message
Session down is marked, then the state by the BFD sessions of the multicast group is changed to " only for path active "；Meanwhile by the multicast
The downstream port in the standby path of group is added in the corresponding MRIB list items in standby path of the multicast group, and for the standby of the multicast group
Coordinates measurement MFIB list items.
After the BFD session Down of the main path of the multicast group, the downstream of the main path in the MFIB list items of main path
Port is not deleted, i.e., when bifurcated tail node receives the multicast data message of the multicast group, multicast data message still from
The downstream port forwarding of the main path, until receive that downstream node sends from the downstream port of the main path is directed to the multicast group
Beta pruning (Prune) message after just by the downstream port of the main path from MFIB list items delete.
Step 406：When bifurcated tail node receives the multicast data message for the multicast group, the multicast group is found
Corresponding MFIB list items, according to the downstream port of the MFIB list items found, which is gone out.
Step 407：When the bifurcated intermediate node on the standby path of the multicast group receives the multicast number for the multicast group
During according to message, on the corresponding PIM list items in standby path for itself finding the multicast group, the downstream port for finding the PIM list items
There is provided it is " standby " mark, and the inbound port of the multicast data message be the PIM list items in this for path upstream port, then will
Downstream port (downstream port in i.e. standby path) there is provided " standby " mark is added in the corresponding MRIB list items of the multicast group, and
The corresponding MFIB list items in standby path of the multicast group are generated, according to the downstream port of the corresponding MFIB list items of the multicast group by the group
Multicast data message forwards.
Step 408：The first preset duration after BFD session Down of the bifurcated first node in the main path of the multicast group
It is interior, detect when this starts to be equal to or higher than predetermined threshold value again for the BFD session ratios on path between bifurcated tail node,
BFD sessions Up marks are then carried in the unicast BFD messages that this backward bifurcated tail node is sent.
Step 409：Bifurcated tail node is in the first preset duration after the BFD sessions Down of the main path of the multicast group,
The unicast BFD messages that bifurcated first node is sent are received, find to carry BFD sessions Up marks in message, then by the shape of BFD sessions
State is changed to " the active and standby equal active " in path.
Step 410：Bifurcated first node is after BFD sessions the second preset durations of active of the main path of the multicast group, edge
The standby path for the multicast group sends the join messages for being directed to the multicast group, and carrying main path in the join messages recovers mark.
Step 411：Bifurcated intermediate node and bifurcated tail node receive join messages, it is found that it is extensive the message carries main path
Multiple mark, then by the corresponding MFIB list items deletion in the standby path of the multicast group, meanwhile, by the inbound port of join messages from the multicast
Deleted in the corresponding MRIB list items in standby path of group.
In addition, in the embodiment of the present application, saved when bifurcated tail node is detected on the standby path of the multicast group with bifurcated head
When BFD session ratios between point are less than predetermined threshold value, BFD sessions Down is carried in the multicast BFD messages sent thereafter
Mark, and the state of the BFD sessions of the multicast group is changed to " only main path active ".
In the first preset duration after BFD session Down of the bifurcated tail node in the standby path of the multicast group, detect
BFD session ratios on the standby path of the multicast group between bifurcated first node start to be equal to or higher than predetermined threshold value, then will
The state of the BFD sessions of the multicast group is changed to " the active and standby equal active " in path.
When bifurcated periproct point discovery：In the first preset duration after the BFD sessions Down of the main path of the multicast group, not
The unicast BFD messages for the carrying BFD sessions Up marks standby path of bifurcated first node along the multicast group sent are received, then are stopped
The multicast BFD messages for the multicast group are sent along the main path of the multicast group, and by the state of the BFD sessions of the multicast group more
It is changed to " active and standby path initialization ".
When bifurcated periproct point discovery：, should in the first preset duration after the BFD sessions Down in the standby path of the multicast group
BFD sessions on the standby path of multicast group do not recover (i.e. BFD session ratios are always below predetermined threshold value) always, then stop edge
The main path of the multicast group sends the multicast BFD messages for the multicast group, and the state of the BFD sessions of the multicast group is changed
For " active and standby path initialization ".
In addition, in the embodiment of the present application, bifurcated first node detects that itself changes to the singlecast router of multicast source, then edge should
The standby path of multicast group sends the unicast BFD messages for carrying BFD sessions Down marks to bifurcated tail node, and stops along the multicast
The standby path transmission unicast BFD messages of group, and, when receive that downstream node sends for the multicast group join messages after,
Return to step 301, so as to the bifurcated first node as the multicast group, new active and standby path is established for the multicast group.
In addition, in the embodiment of the present application, if after one group of active/standby path for a multicast group G is established, bifurcated first node connects
The join messages for multicast group G that downstream node is sent, and the bifurcated mark set in the join messages are received, then foundation
Downstream preferential principle, bifurcated first node send prune messages along the active and standby path of the multicast group respectively, are taken in prune messages
Band multicast group G marks, meanwhile, the join messages that this node is newly received as bifurcated intermediate node handles.
The embodiment of the present application needs to be extended existing join messages.Fig. 5 is that the PIM join that RFC4601 is defined disappear
Form is ceased, Fig. 6 is extended example of the embodiment of the present application to join messages shown in Fig. 5, as shown in fig. 6, the embodiment of the present application
Extension is main as follows：
1) a new value is defined for the type field in the first row of PIM join messages, such as：Value 3, with table
It is the message used in multicast divergence to show the join messages；
2) marked the Reserved fields (totally 1 byte) in the first row of PIM join messages as MoDP applications, example
Such as：Can value be 0x01；
3) using the Reserved fields (totally 1 byte) in the third line of PIM join messages as MoDP-Type (altogether
3bit), H (common 4bit) and D (common 1bit) marks, wherein：
31)MoDP-Type：The type of the join message sent for representing bifurcated first node, specifically includes three kinds：
A, the join message that bifurcated first node is sent to the main path of multicast group, at this time, MoDP-Type values can be
0x00；
B, the join message that bifurcated first node is sent to the standby path of multicast group, at this time, MoDP-Type values can be
0x01；
C, the join message that bifurcated first node is recovered to the notice main path that bifurcated tail node is sent, at this time, MoDP-Type
Value can be 0x02.
32)H：Represent hop count of the join message on the master of multicast group or standby path；
33)D：Bifurcated marks.
4) in addition, in the embodiment of the present application, it is also necessary to 2 fields are inserted into join messages：The IP of bifurcated first node
Location and the IP address of bifurcated tail node, specifically, can be inserted into 8 bytes, preceding 4 words at the end of the 3rd row of join messages
Section represents the IP address of bifurcated first node, the IP address of rear 4 byte representations bifurcated tail node.
The advantageous effects of the embodiment of the present application are as follows：
One) when generating active and standby path for multicast group, multicast forwarding list item is only generated on main path, on standby path
PIM list items are only generated without generating multicast forwarding list item, in this way, flux of multicast only forwards on main path, when main path failure
Afterwards, multicast forwarding list item just is generated on standby path, so that on the premise of flux of multicast protection is realized, saves bandwidth.
Two) flux of multicast dynamic protection and handover mechanism are provided, flux of multicast does not interrupt during node failure.
Fig. 7 is the composition schematic diagram of flux of multicast protective device provided by the embodiments of the present application, which is located at PIM-SM
On node in network, which mainly includes：Multicast list maintenance module and BFD modules, wherein：
Multicast list maintenance module：The join messages for multicast group are received, determine to be provided with the join messages
MoDP application marks, and bifurcated mark set, then, mark, for described group if being provided with main path in the join messages
Broadcast main path generation PIM list items, MRIB list items and the MFIB list items of group；If being provided with standby path tag in the join messages,
Then it is directed to standby the coordinates measurement PIM list items and MRIB list items of the multicast group.
BFD modules：After the completion of being established when the active and standby path, the tail nodes of the diverging paths is received along the master
During the first BFD messages of multicast for being directed to the multicast group that path is sent, according to the MFIB list items forwarding multicast first
BFD messages；Receive the diverging paths first node be sent to along the standby path diverging paths tail node unicast
During the 2nd BFD messages, the 2nd BFD messages of unicast are forwarded according to the unicast forwarding list item itself preserved.
Main path generation PIM list item, MRIB list item and MFIB list item of the multicast list maintenance module for the multicast group
It is further used for afterwards, if itself not generating the PIM list items and MRIB list items in the standby path for the multicast group, confirms certainly
As the intermediate node of the diverging paths, the join messages are directly sent to multicast source；Otherwise, confirm itself for described point
The tail node in cross road footpath, multicast source is sent to after the join messages are converted into common join messages；
Multicast list maintenance module is for further after standby the coordinates measurement PIM list items and MRIB list items of the multicast group
For if itself not generating the PIM list items, MRIB list items and MFIB list items for the main path of the multicast group, confirming certainly
As the intermediate node of the diverging paths, the join messages are directly sent to multicast source；Otherwise, confirm itself for described point
The tail node in cross road footpath, multicast source is sent to after the join messages are converted into common join messages.
BFD modules are further used for, and when this node is the tail node of the diverging paths, receive the unicast second
After BFD messages, the BFD session establishments between the first node of the tail node of the diverging paths and the diverging paths；Alternatively, work as
When this node is the first node of the diverging paths, after receiving the first BFD messages of multicast, the periproct of the diverging paths
BFD session establishments between point and the first node of the diverging paths.
BFD modules are further used for, after BFD session establishments,
When this node is the first node of diverging paths, the periproct with the diverging paths on the main path is detected
When BFD session ratios between point are less than predetermined threshold value, the main path failure is determined, and send and carry BFD sessions Down marks
The 3rd BFD messages of unicast of note；
When this node is the tail node of the diverging paths, when receiving the 3rd BFD messages of unicast, described in confirmation
Main path failure, MFIB list items are generated for the standby path for the multicast group, and send multicast packet along the standby path
Message；
When this node is the intermediate node of the diverging paths, when receiving the multicast data message, for described
Standby path generates MFIB list items for the multicast group, and forwards the multicast data message according to the MFIB list items of generation.
BFD modules are further used for, after the main path failure,
When this node is the first node of diverging paths, the periproct with the diverging paths on the main path is detected
When BFD session ratios between point are equal to or higher than predetermined threshold value, confirm the main path fault recovery, along the standby path to
The tail node of the diverging paths sends the 4th BFD messages of unicast for carrying BFD sessions Up marks, and starts timer, fixed
When device to constantly, the join messages for carrying main path and recovering mark are sent along the standby path；
When the tail node of intermediate node or the diverging paths that this node is the diverging paths, the carrying is received
Main path recovers the join messages of mark, and will the corresponding MFIB list items deletion in the standby path.
Multicast list maintenance module is further used for, and before receiving the addition join messages for multicast group, works as this section
Point for the diverging paths first node when, the unicast forwarding list item of multicast source is arrived according to this node, to the multiple of multicast source
Optimal and suboptimum next-hop is selected in next-hop；Main path is set to mark in the join messages for be sent to optimal next-hop,
It is sent in the join messages of suboptimum next-hop and standby path tag is set, while for main path generation PIM list items, MRIB tables
Item and MFIB list items, for the standby coordinates measurement PIM list items and MRIB list items.
Multicast list maintenance module is further used for, after the completion of the active and standby path is established,
When this node is the first node of the diverging paths, join messages are received；If in the join messages received
Bifurcated mark set, then delete itself be directed to the active and standby path PIM list items, MRIB list items and MFIB list items, and respectively
Beta pruning prune messages are sent along the active and standby path；
When this node is the middle node or tail node of the diverging paths, the prune messages are received, and are then deleted certainly
Body is directed to PIM list items, MRIB list items and the MFIB list items in the active and standby path.
The foregoing is merely the preferred embodiment of the application, not limiting the application, all essences in the application
God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of the application protection.
Claims (14)
1. a kind of flux of multicast guard method, it is characterised in that this method includes：
Any node in Protocol Independent Multicast-Sparse Mode PIM-SM networks receives the addition join messages for multicast group,
Determine to be provided with the quick heavy-route MoDP applications mark of multicast based on diverging paths in the join messages, and bifurcated mark is put
Position, then,
If being provided with main path in the join messages to mark, for main path generation PIM list items, the multicast of the multicast group
Routing information base MRIB list items and multicast forwarding information bank MFIB list items；
If being provided with standby path tag in the join messages, for the multicast group standby coordinates measurement PIM list items with
MRIB list items；
After the completion of being established when the active and standby path, the node receives the tail nodes of the diverging paths along the main path
When the first two-way converting of multicast for the multicast group sent detects BFD messages, according to MFIB list items forwarding
The first BFD messages of multicast；
The first node that the node receives the diverging paths is sent to along the standby path tail nodes of the diverging paths
During the 2nd BFD messages of unicast, the 2nd BFD messages of unicast are forwarded according to the unicast forwarding list item itself preserved.
2. according to the method described in claim 1, it is characterized in that, the main path for the multicast group generates PIM tables
After item, MRIB list items and MFIB list items, the method further includes：
If itself not generating the PIM list items and MRIB list items in the standby path for the multicast group, confirm itself for described point
The intermediate node in cross road footpath, is directly sent to multicast source by the join messages；Otherwise, the tail that itself is the diverging paths is confirmed
Node, multicast source is sent to after the join messages are converted into common join messages；
Further comprise after standby the coordinates measurement PIM list items and MRIB list items for the multicast group：
If itself not generating the PIM list items, MRIB list items and MFIB list items for the main path of the multicast group, itself is confirmed
For the intermediate node of the diverging paths, the join messages are directly sent to multicast source；Otherwise, confirm itself to be the bifurcated
The tail node in path, multicast source is sent to after the join messages are converted into common join messages.
3. according to the method described in claim 1, it is characterized in that,
The node is the tail node of the diverging paths, after receiving the 2nd BFD messages of unicast, and, the node is
The first node of the diverging paths, after receiving the first BFD messages of multicast, the tail node of the diverging paths and described point
BFD session establishments between the first node in cross road footpath.
4. according to the method described in claim 3, it is characterized in that, after the BFD session establishments, the method further includes：
When the node is the first node of diverging paths, detect on the main path between the tail node of the diverging paths
BFD session ratios when being less than predetermined threshold value, determine the main path failure, and send and carry BFD sessions Down marks
The 3rd BFD messages of unicast；
The node is the tail node of the diverging paths, when receiving the 3rd BFD messages of unicast, confirms the main path
Failure, MFIB list items are generated for the standby path for the multicast group, and send multicast data message along the standby path；
The node is the intermediate node of the diverging paths, when receiving the multicast data message, for the standby path
MFIB list items are generated for the multicast group, and the multicast data message is forwarded according to the MFIB list items of generation.
5. according to the method described in claim 4, it is characterized in that, after the main path failure, this method further includes：
When the node is the first node of diverging paths, detect on the main path between the tail node of the diverging paths
BFD session ratios when being equal to or higher than predetermined threshold value, the main path fault recovery is confirmed, along the standby path to described
The tail node of diverging paths sends the 4th BFD messages of unicast for carrying BFD sessions Up marks, and starts timer, in timer
To constantly, the join messages for carrying main path and recovering mark are sent along the standby path；
When the tail node of intermediate node or the diverging paths that the node is the diverging paths, the node receives institute
State and carry the join messages that main path recovers mark, and will the corresponding MFIB list items deletion in the standby path.
6. according to the method described in claim 1, it is characterized in that, any node receives the addition for multicast group
Before join messages, the method further includes：
When the node be the diverging paths first node when, according to this node arrive multicast source unicast forwarding list item, to
Optimal and suboptimum next-hop is selected in multiple next-hops of multicast source；
Set main path to mark in the join messages for be sent to optimal next-hop, set in the join messages for being sent to suboptimum next-hop
Purchase path tag, while for main path generation PIM list items, MRIB list items and MFIB list items, for the standby path
Generate PIM list items and MRIB list items.
7. according to the method described in claim 6, it is characterized in that, after the completion of the active and standby path foundation, the method is also wrapped
Include：
When the node is the first node of the diverging paths, the node receives join messages；
If the bifurcated mark set in the join messages received, deletes the PIM tables that itself is directed to the active and standby path
Item, MRIB list items and MFIB list items, and respectively beta pruning prune messages are sent along the active and standby path；
When the node is the middle node or tail node of the diverging paths, the prune messages are received, and delete itself pin
To the PIM list items, MRIB list items and MFIB list items in the active and standby path.
8. a kind of flux of multicast protective device, on the node in Protocol Independent Multicast-Sparse Mode PIM-SM networks, it is special
Sign is that the device includes：
Multicast list maintenance module：The addition join messages for multicast group are received, determine to be provided with the join messages
The quick heavy-route MoDP applications mark of multicast based on diverging paths, and bifurcated mark set, then, if being set in the join messages
Main path mark is put, then for main path generation PIM list items, Multicast Routing information bank MRIB list items and the group of the multicast group
Broadcast forwarding information storehouse MFIB list items；If standby path tag is provided with the join messages, for the standby road of the multicast group
Footpath generates PIM list items and MRIB list items；
BFD modules：After the completion of being established when the active and standby path, the tail nodes of the diverging paths is received along the main path
When the first two-way converting of multicast for the multicast group sent detects BFD messages, according to MFIB list items forwarding
The first BFD messages of multicast；The first node for receiving the diverging paths is sent to the periproct of the diverging paths along the standby path
During the 2nd BFD messages of unicast of point, the 2nd BFD messages of unicast are forwarded according to the unicast forwarding list item itself preserved.
9. device according to claim 8, it is characterised in that the multicast list maintenance module is for the multicast group
It is further used for after main path generation PIM list items, MRIB list items and MFIB list items, if itself is not generated for the multicast group
Standby path PIM list items and MRIB list items, then confirm itself be the diverging paths intermediate node, directly by the join
Message is sent to multicast source；Otherwise, confirm the tail node that itself is the diverging paths, the join messages are converted into commonly
Multicast source is sent to after join messages；
The multicast list maintenance module is for further after standby the coordinates measurement PIM list items and MRIB list items of the multicast group
For if itself not generating the PIM list items, MRIB list items and MFIB list items for the main path of the multicast group, confirming certainly
As the intermediate node of the diverging paths, the join messages are directly sent to multicast source；Otherwise, confirm itself for described point
The tail node in cross road footpath, multicast source is sent to after the join messages are converted into common join messages.
10. device according to claim 8, it is characterised in that
The BFD modules are further used for, and when this node is the tail node of the diverging paths, receive the unicast second
After BFD messages, the BFD session establishments between the first node of the tail node of the diverging paths and the diverging paths；Alternatively, work as
When this node is the first node of the diverging paths, after receiving the first BFD messages of multicast, the periproct of the diverging paths
BFD session establishments between point and the first node of the diverging paths.
11. device according to claim 10, it is characterised in that the BFD modules are further used for, BFD session establishments
Afterwards,
When this node is the first node of diverging paths, detect on the main path between the tail node of the diverging paths
BFD session ratios when being less than predetermined threshold value, determine the main path failure, and send and carry BFD sessions Down marks
The 3rd BFD messages of unicast；
When this node is the tail node of the diverging paths, when receiving the 3rd BFD messages of unicast, the main road is confirmed
Footpath failure, MFIB list items are generated for the standby path for the multicast group, and send multicast data message along the standby path；
When this node is the intermediate node of the diverging paths, when receiving the multicast data message, for the standby road
Footpath generates MFIB list items for the multicast group, and forwards the multicast data message according to the MFIB list items of generation.
12. according to the devices described in claim 11, it is characterised in that the BFD modules are further used for, the main path event
After barrier,
When this node is the first node of diverging paths, detect on the main path between the tail node of the diverging paths
BFD session ratios when being equal to or higher than predetermined threshold value, the main path fault recovery is confirmed, along the standby path to described
The tail node of diverging paths sends the 4th BFD messages of unicast for carrying BFD sessions Up marks, and starts timer, in timer
To constantly, the join messages for carrying main path and recovering mark are sent along the standby path；
When the tail node of intermediate node or the diverging paths that this node is the diverging paths, the carrying main road is received
The join messages of mark are recovered in footpath, and will the corresponding MFIB list items deletion in the standby path.
13. device according to claim 8, it is characterised in that the multicast list maintenance module is further used for,
Before receiving the addition join messages for multicast group, when this node is the first node of the diverging paths, according to
This node arrives the unicast forwarding list item of multicast source, and optimal and suboptimum next-hop is selected in multiple next-hops to multicast source；
Set main path to mark in the join messages for be sent to optimal next-hop, set in the join messages for being sent to suboptimum next-hop standby
Path tag, while for main path generation PIM list items, MRIB list items and MFIB list items, for the standby coordinates measurement
PIM list items and MRIB list items.
14. device according to claim 13, it is characterised in that the multicast list maintenance module is further used for, institute
After the completion of stating active and standby path foundation,
When this node is the first node of the diverging paths, join messages are received；If point in the join messages received
Fork mark set, then delete PIM list items, MRIB list items and MFIB list items that itself is directed to the active and standby path, and respectively along institute
State active and standby path and send beta pruning prune messages；
When this node is the middle node or tail node of the diverging paths, the prune messages are received, and then delete itself pin
To the PIM list items, MRIB list items and MFIB list items in the active and standby path.
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| CN109474520B (en) * | 2017-09-07 | 2022-07-08 | 中兴通讯股份有限公司 | Flow forwarding method of multicast VPN (virtual private network), PE (provider edge) and multicast VPN |
| CN110535675B (en) * | 2018-05-25 | 2022-03-01 | 中兴通讯股份有限公司 | Method and device for multicast fast switching |
| CN109218207B (en) * | 2018-09-30 | 2021-02-26 | 新华三技术有限公司 | Multicast traffic processing method and device and routing equipment |
| CN112134776B (en) * | 2019-06-25 | 2022-08-26 | 华为技术有限公司 | Method for generating multicast forwarding table item and access gateway |
| CN112822097A (en) * | 2019-11-15 | 2021-05-18 | 华为技术有限公司 | Message forwarding method, first network device and first device group |
| CN114268561B (en) * | 2020-09-15 | 2023-06-09 | 烽火通信科技股份有限公司 | BFD message sending device and method |
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