CN110752992B - Device and method for realizing point-to-multipoint by MPLS SBFD reflection end - Google Patents
Device and method for realizing point-to-multipoint by MPLS SBFD reflection end Download PDFInfo
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- CN110752992B CN110752992B CN201911030253.2A CN201911030253A CN110752992B CN 110752992 B CN110752992 B CN 110752992B CN 201911030253 A CN201911030253 A CN 201911030253A CN 110752992 B CN110752992 B CN 110752992B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/70—Routing based on monitoring results
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
Abstract
The invention discloses a device and a method for realizing point-to-multipoint by an MPLS SBFD reflection end. The device comprises: the message identification module is used for identifying the type of the received message and sending the message to the corresponding module according to the message type; the OAM engine module is used for generating loopback information and sending the loopback information and the MPLS message to the message editing module; and the message editing module is used for editing the MPLS message according to the loopback information and sending the edited message to the message loopback module. And the message loopback module is used for sending the edited message to the message identification module. Compared with the prior art, the device for realizing point-to-multipoint by the MPLS SBFD reflection end separates the editing step of the SBFD reply message for the sending end from the packaging step of the MPLS label, multiplexes the forwarding information of the data message after the message loops back, and searches a routing table to determine the export and the editing information of the next hop, thereby realizing that one reflection end supports a plurality of sending ends.
Description
Technical Field
The invention relates to the field of communication, in particular to a device and a method for realizing point-to-multipoint by an MPLS SBFD reflection end.
Background
The requirements for operation and maintenance are higher and higher in the current network development, and higher requirements are provided for how to quickly and effectively detect network abnormality and perform backup recovery.
Bidirectional Forwarding Detection (BFD) is a mechanism for fast error Detection in a network, and currently, there are various BFD technologies such as Internet Protocol-BFD (IP-BFD for short), Multi-Protocol Label Switching-BFD (MPLS-BFD for short), and MPLS Transport network Bidirectional Forwarding Detection (MPLS Transport Profile BFD for short). The BFD technique in the related art needs to perform a conventional 3-way handshake process when establishing a session, and the conventional handshake process is not only complicated in operation but also inefficient. Based on the above-mentioned problem of BFD in the related art, a Seamless Bidirectional Forwarding Detection (SBFD) is provided.
SBFD is a link check mechanism that simplifies the BFD state machine and can be used in IP and MPLS network environments. According to the descriptions of Rfc7880 and Rfc7881, the S-BFD can be divided into a transmitting end (SBFDInitiator) and a reflecting end (SBFDReflector) according to its own role. And a reflection end can have a plurality of transmitting ends according to the protocol, and one reflection end respectively responds to different transmitting ends. In an MPLS network environment, how to implement correct MPLS Label encapsulation for different transmitting ends for an MPLS encapsulated SBFD packet by a reflecting end is a problem that needs to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a device and a method for realizing point-to-multipoint by an MPLS SBFD reflection end.
To achieve one of the above objects, an embodiment of the present invention provides an apparatus for implementing point-to-multipoint at MPLS SBFD reflection end, which includes:
the message identification module is used for identifying the type of the received message and sending the message to a corresponding module according to the message type, wherein when the type of the received message is an MPLS message which is sent to the node and carries an SBFD message, the message is sent to the OAM engine module, and when the type of the received message is an IP message which needs to be forwarded, the IP message is forwarded;
the OAM engine module is used for generating loopback information and sending the loopback information and the MPLS message to the message editing module;
and the message editing module is used for editing the MPLS message according to the loopback information and sending the edited message to the message loopback module.
And the message loopback module is used for sending the edited message to the message identification module.
As a further improvement of an embodiment of the present invention, the loopback information specifically includes:
popping up a label of the MPLS label;
the destination IP of the IP header and the source IP exchange marks;
the destination port and the source port of the UDP header exchange marks;
the My descriptor and the Young descriptor of the SBFD message are subjected to label exchange;
modifying the D field of the SBFD message into a 0 mark;
and modifying the Sta field of the SBFD message into a mark of the SBFD state information of the local end node.
As a further improvement of an embodiment of the present invention:
the device also comprises a message forwarding module, wherein the message forwarding module comprises a routing table and a label database, and generates forwarding information through the IP message, the routing table and the label database, and sends the IP message and the forwarding information to a message editing module;
when the message identification module forwards the IP message, the message identification module firstly sends the IP message to the message forwarding module;
and the message editing module is also used for editing and forwarding the IP message according to the forwarding information.
As a further improvement of an embodiment of the present invention:
the message forwarding module is also used for finding a corresponding MPLS label according to a target IP and a label database of the IP message; finding the next hop of the outgoing interface of the IP message according to the destination IP of the IP message and the routing table;
the forwarding information comprises the MPLS label and an outgoing interface of a next hop;
the message editing module is further configured to print the MPLS label on the IP message to obtain an MPLS message; and forwarding the MPLS message from an egress interface of a next hop of the IP message.
In order to achieve one of the above objects, an embodiment of the present invention provides a method for implementing point-to-multipoint at MPLS SBFD reflection end, where the method includes:
when receiving MPLS message carrying SBFD message sent to the local end node, generating loopback information;
editing the MPLS message according to the loopback information to obtain an IP message carrying an SBFD message;
looping back the IP message and sending the IP message to the IP message again;
and when receiving the IP message to be forwarded, forwarding the IP message.
As a further improvement of an embodiment of the present invention, determining whether a received packet is an MPLS packet that carries an SBFD packet and is sent to the local end node specifically includes:
when the target IP of the IP message encapsulated in the received MPLS message is the IP of the local end node, acquiring a global descriptor of an SBFD message encapsulated in the inner layer of the MPLS message;
and if the global descriptor is matched with the global descriptor of the local node, judging that the received message is the MPLS message which is sent to the local node and carries the SBFD message.
As a further improvement of an embodiment of the present invention, the "editing an MPLS packet according to the loopback information" specifically includes:
popping up an MPLS label of the MPLS message to obtain an IP message;
exchanging the destination IP and the source IP of the IP message;
exchanging a destination port and a source port of the UDP message encapsulated in the IP message memory;
exchanging the My distributor and the outer distributor of the SBFD message encapsulated in the UDP message;
modifying the D field of the SBFD message to 0;
and modifying the Sta field of the SBFD message into the SBFD state information of the local end node.
As a further improvement of an embodiment of the present invention, the "forwarding the IP packet" specifically includes:
generating forwarding information according to the IP message, the routing table and the label database;
and editing and forwarding the IP message according to the forwarding information.
As a further improvement of an embodiment of the present invention, "generating forwarding information according to an IP packet, a routing table, and a label database" specifically includes:
finding out a corresponding MPLS label according to a target IP and a label database of the IP message;
and finding out the next hop outgoing interface of the IP message according to the destination IP and the routing table of the IP message.
As a further improvement of an embodiment of the present invention, the "editing and forwarding an IP packet according to the forwarding information" specifically includes:
packaging the corresponding MPLS label for the IP message to obtain an MPLS message;
and forwarding the MPLS message out from the next hop of the outgoing interface.
Compared with the prior art, the device for realizing point-to-multipoint by the MPLS SBFD reflection end of the invention divides the packaging steps of the reply message to the sending end into two steps: firstly, according to a normal MPLS message processing flow, firstly, editing an IP message carrying an SBFD reply message; and secondly, encapsulating a correct MPLS label for the IP message according to a normal data forwarding flow. Through the two steps, the editing step of the SBFD reply message for the sending end is separated from the packaging step of the MPLS label, after the message loops back, the forwarding information of the data message is multiplexed, and the routing table is searched to determine the export and the editing information of the next hop, so that one reflecting end supports a plurality of sending ends.
Drawings
Fig. 1 is an SBFD message format.
Fig. 2 is a block diagram of an apparatus for implementing point-to-multipoint at MPLS SBFD reflection end according to the present invention.
Fig. 3 is a flowchart illustrating a method for implementing point-to-multipoint by MPLS SBFD reflection end according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
Before describing the present invention, SBFD will be briefly described.
The SBFD can be divided into a sending end and a reflecting end according to own roles, the sending end actively sends the SBFD messages (aiming at initiating the SBFD detection), maintains an updating state machine, initiates negotiation and the like, and the reflecting end passively reflects the received SBFD messages. And sending an SBFD message through the sending end, replying the SBFD message by the reflecting end, and detecting whether the link between the nodes is normal or not.
The SBFD message is encapsulated in a UDP message, which is then encapsulated in an IP message for transmission over the IP network (by adding an IP header in front of the UDP message). In the MPLS network, an MPLS label needs to be marked on the front of an IP packet to be encapsulated into an MPLS packet for transmission. In addition, the SBFD message may be identified by UDP port 7784 or ACH Type 0x 0008.
Fig. 1 is a schematic diagram of an SBFD message format, and as shown in fig. 1, Sta represents a local node state of an SBFD, where the local node state of a transmitting end includes UP, down, and AdminDown 3 states, a reflecting end only has UP and AdminDown states, and UP and down of a port respectively correspond to UP and AdminDown of the SBFD state. The D field is used to distinguish whether the transmitter is a transmitter or a reflector, where D1 denotes the transmitter and D0 denotes the reflector. The My descriptor and the outer descriptor fields are global descriptors of a source and a destination respectively, and are used for detecting whether the SBFD message is sent to the end node.
The reason why the SBFD reflector supports point-to-multipoint support in the IP network is that for the IP encapsulated SBFD message, the reflector can search a routing forwarding table according to the source IP of the received IP message, and find an egress interface of the next hop to forward the IP message, thereby implementing point-to-multipoint support at the reflector. However, in the MPLS network, how to encapsulate a corresponding MPLS label for different sending ends by a reflection end, so as to implement point-to-multipoint of the reflection end, is a difficult problem that needs to be solved at present.
As shown in fig. 2, the structural block diagram of the apparatus for implementing point-to-multipoint at MPLS SBFD reflection end of the present invention includes a message identification module, an OAM engine module, a message editing module and a message loopback module, where:
the message identification module is used for identifying the type of the received message and sending the message to a corresponding module according to the message type, wherein when the type of the received message is an MPLS message which is sent to the local end node and carries an SBFD message, the message is sent to the OAM engine module, and when the type of the received message is an IP message which needs to be forwarded, the IP message is forwarded.
Specifically, when receiving an IP packet or an MPLS packet, the packet identification module first determines whether the packet is a packet to be sent to the packet identification module (home node) according to a destination IP of an IP header of the IP packet or the MPLS packet, and if so, further identifies the packet, otherwise, forwards the packet. Then, when the destination IP of the IP packet encapsulated in the received MPLS packet is the IP of the local node, it is obtained whether the global descriptor Your descriptor of the SBFD packet encapsulated in the inner layer of the MPLS packet matches (i.e., is the same as) the global descriptor of the local node, and if so, it is determined that the received packet is the MPLS packet carrying the SBFD packet and sent to the local node.
The OAM engine module is used to process the information of the SBFD home node, including how to reply the message to the opposite end (sending end). The OAM engine module generates loopback information and sends the loopback information and the MPLS message to the message editing module. Specifically, the loopback information includes:
(1) pop label of MPLS label: and popping up the MPLS label of the MPLS message by the message editing module according to the mark to obtain the IP message.
(2) The destination IP of the IP header is traded against the source IP with the notation: according to the mark, the message editing module exchanges the destination IP of the IP header of the IP message with the source IP (in this application, the source/destination IP of the IP message, i.e., the source/destination IP of the IP header of the IP message).
(3) The destination port and the source port of the UDP header exchange the labels: and exchanging the destination port and the source port of the UDP header by the message editing module according to the mark.
(4) The My distributor and the Young distributor of the SBFD message exchange marks: and according to the mark, the message editing module exchanges My distributor and outer distributor of the SBFD message.
(5) Modifying the D field of the SBFD message into a 0 mark: and the D field is 0 to represent a reflecting end, and the message editing module modifies the D field of the SBFD message into 0 according to the mark.
(6) Modifying the Sta field of the SBFD message into a mark of the SBFD state information of the local end node: the OAM engine module converts the state of the port into SBFD state information (UP and down of the port respectively correspond to UP and AdminDown of the SBFD state), and the port is placed in loopback information, and the message editing module modifies the Sta field of the SBFD message into the SBFD state information of the local node.
The message editing module is used for editing the MPLS message according to the loopback information and sending the edited message to the message loopback module. It should be noted here that the loopback information further includes how to forward the edited packet, so that the packet editing module sends the edited packet to the packet loopback module according to the forwarding information.
The message loopback module is used for resending the edited message to the message identification module. The edited message refers to an IP message with an edited IP header, UDP header and SBFD message, but the MPLS label of the corresponding transmitting terminal is not marked. The message loopback module is used for retransmitting the edited IP message to the message identification module, and the message identification module forwards the IP message according to the target IP of the IP message.
Further, the device also comprises a message forwarding module, wherein the message forwarding module comprises a routing table and a label database. When the message identification module forwards the IP message, the message identification module firstly sends the IP message to the message forwarding module. And the message identification module generates forwarding information through the IP message, the routing table and the label database, and sends the IP message and the forwarding information to a message editing module. And the message editing module is also used for editing and forwarding the IP message according to the forwarding information.
Specifically, the label database is used for storing a corresponding relationship between the IP address and the label, and the routing table is used for storing a corresponding relationship between the IP address and the next hop outgoing interface. The message forwarding module finds a corresponding MPLS label according to a target IP of the IP message and the label database; and finding the next hop of the outgoing interface of the IP message according to the destination IP of the IP message and the routing table. The forwarding information includes the MPLS label and information about the next hop's outgoing interface. And the message editing module marks a correct MPLS label on the IP message to obtain an MPLS message, and then forwards the MPLS message from an outlet interface of the next hop of the IP message.
The device for realizing point-to-multipoint by MPLS SBFD reflection end of the invention divides the packaging steps of the reply message to the sending end into two steps: firstly, according to a normal MPLS message processing flow, an IP message carrying an SBFD reply message is edited and then is sent to the IP message again; and secondly, encapsulating a correct MPLS label for the IP message according to a normal data forwarding flow. Through the two steps, one reflecting end supports a plurality of transmitting ends.
As shown in fig. 3, the present invention further provides a method for implementing point-to-multipoint at MPLS SBFD reflection end, where the method includes the following steps:
step S01: and when receiving the MPLS message which is sent to the end node and carries the SBFD message, generating loopback information.
Specifically, when the destination IP of the IP packet encapsulated in the received MPLS packet is the IP of the local node, the global descriptor of the SBFD packet encapsulated in the inner layer of the MPLS packet is obtained, and if the global descriptor is matched with the global descriptor of the local node, it is determined that the packet received by the ingress port is the MPLS packet carrying the SBFD packet and sent to the local node. The SBFD message here is an SBFD message sent by a sending end.
According to the state information of the SBFD home node, loop-back information is generated, and of course, the loop-back information further includes other edit information for the MPLS label, the IP header, the UDP header, and the SBFD message, which may specifically refer to the foregoing.
Step S02: and editing the MPLS message according to the loopback information to obtain an IP message carrying the SBFD message. The specifically edited content includes:
popping up an MPLS label of the MPLS message to obtain an IP message;
exchanging the destination IP and the source IP of the IP message;
exchanging a destination port and a source port of the UDP message encapsulated in the IP message memory;
exchanging the My distributor and the outer distributor of the SBFD message encapsulated in the UDP message;
modifying the D field of the SBFD message to 0;
and modifying the Sta field of the SBFD message into the SBFD state information of the local end node.
The SBFD message carried in the edited IP message is the SBFD message which is replied to the sending end by the reflecting end.
Step S03: and looping the IP message back and sending the IP message to the IP message.
The loopback operation is performed inside the chip of the home node, the specific loopback process is similar to the process of adding a connection line between an output port and an input port of the home node, and a message is sent out from the output port and sent into the input port.
Step S04: and when receiving the IP message to be forwarded, forwarding the IP message.
When the local node receives the IP packet sent to the sending end with the SBFD reply packet again, the destination IP of the IP packet is not the local node, so the IP packet is forwarded according to the data forwarding flow.
Further, forwarding the IP packet specifically includes:
step S041: and generating forwarding information according to the IP message, the routing table and the label database.
Finding out a corresponding MPLS label according to a target IP and a label database of the IP message;
and finding out the next hop outgoing interface of the IP message according to the destination IP and the routing table of the IP message.
Step S042: and editing and forwarding the IP message according to the forwarding information.
Packaging the corresponding MPLS label for the IP message to obtain an MPLS message;
and forwarding the MPLS message out from the next hop of the outgoing interface.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. An apparatus for implementing point-to-multipoint at MPLS SBFD reflection end, the apparatus comprising:
the message identification module is used for identifying the type of the received message and sending the message to a corresponding module according to the message type, wherein when the type of the received message is an MPLS message which is sent to the node and carries an SBFD message, the message is sent to the OAM engine module, and when the type of the received message is an IP message which needs to be forwarded, the IP message is forwarded;
the OAM engine module is used for generating loopback information and sending the loopback information and the MPLS message to the message editing module;
the message editing module is used for editing the MPLS message according to the loopback information and sending the edited message to the message loopback module;
the message loopback module sends the edited message to the message identification module;
the loopback information specifically includes: popping up a label of an MPLS (multi-protocol label switching) label, interchanging a target IP and a source IP of an IP header, interchanging a target port and a source port of a UDP (user datagram protocol) header, interchanging a My repeater and a Young repeater of an SBFD message, modifying a D field of the SBFD message into a label of 0, modifying a Sta field of the SBFD message into a label of SBFD state information of a local end node;
the edited message refers to an IP message with an edited IP header, UDP header and SBFD message, and the edited message does not include the MPLS label of the corresponding transmitting terminal.
2. The apparatus of claim 1 wherein the MPLS SBFD reflection end implements point-to-multipoint, wherein:
the device also comprises a message forwarding module, wherein the message forwarding module comprises a routing table and a label database, and generates forwarding information through the IP message, the routing table and the label database, and sends the IP message and the forwarding information to a message editing module;
when the message identification module forwards the IP message, the message identification module firstly sends the IP message to the message forwarding module;
and the message editing module is also used for editing and forwarding the IP message according to the forwarding information.
3. The apparatus of claim 2 wherein the MPLS SBFD reflection end implements point-to-multipoint, wherein:
the message forwarding module is also used for finding a corresponding MPLS label according to a target IP and a label database of the IP message; finding the next hop of the outgoing interface of the IP message according to the destination IP of the IP message and the routing table;
the forwarding information comprises the MPLS label and an outgoing interface of a next hop;
the message editing module is further configured to print the MPLS label on the IP message to obtain an MPLS message; and forwarding the MPLS message from an egress interface of a next hop of the IP message.
4. A method for implementing point-to-multipoint at MPLS SBFD reflection end, the method comprising:
when receiving MPLS message carrying SBFD message sent to the local end node, generating loopback information; the loopback information specifically includes: popping up a label of an MPLS (multi-protocol label switching) label, interchanging a target IP and a source IP of an IP header, interchanging a target port and a source port of a UDP (user datagram protocol) header, interchanging a My repeater and a Young repeater of an SBFD message, modifying a D field of the SBFD message into a label of 0, modifying a Sta field of the SBFD message into a label of SBFD state information of a local end node;
editing the MPLS message according to the loopback information to obtain an IP message carrying an SBFD message;
looping back the IP message and sending the IP message to the IP message again;
and when receiving the IP message to be forwarded, forwarding the IP message.
5. The method of claim 4, wherein the determining whether the received packet is an MPLS packet carrying an SBFD packet and sent to the local node specifically comprises:
when the target IP of the IP message encapsulated in the received MPLS message is the IP of the local end node, acquiring a global descriptor of an SBFD message encapsulated in the inner layer of the MPLS message;
and if the global descriptor is matched with the global descriptor of the local node, judging that the received message is the MPLS message which is sent to the local node and carries the SBFD message.
6. The method for implementing point-to-multipoint at MPLS SBFD reflecting end according to claim 4, wherein the "editing MPLS packets according to the loopback information" specifically includes:
popping up an MPLS label of the MPLS message to obtain an IP message;
exchanging the destination IP and the source IP of the IP message;
exchanging a destination port and a source port of the UDP message encapsulated in the IP message memory;
exchanging the My distributor and the outer distributor of the SBFD message encapsulated in the UDP message;
modifying the D field of the SBFD message to 0;
and modifying the Sta field of the SBFD message into the SBFD state information of the local end node.
7. The method of claim 4, wherein the forwarding the IP packet specifically comprises:
generating forwarding information according to the IP message, the routing table and the label database;
and editing and forwarding the IP message according to the forwarding information.
8. The method of claim 7, wherein generating forwarding information according to the IP packet, the routing table, and the label database specifically comprises:
finding out a corresponding MPLS label according to a target IP and a label database of the IP message;
and finding out the next hop outgoing interface of the IP message according to the destination IP and the routing table of the IP message.
9. The method of claim 8, wherein the "editing and forwarding the IP packet according to the forwarding information" specifically includes:
packaging the corresponding MPLS label for the IP message to obtain an MPLS message;
and forwarding the MPLS message out from the next hop of the outgoing interface.
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