CN107547402A - A kind of forwarding table generation method and device - Google Patents
A kind of forwarding table generation method and device Download PDFInfo
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- CN107547402A CN107547402A CN201710591639.5A CN201710591639A CN107547402A CN 107547402 A CN107547402 A CN 107547402A CN 201710591639 A CN201710591639 A CN 201710591639A CN 107547402 A CN107547402 A CN 107547402A
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Abstract
The application provides a kind of forwarding-table item generation method and device, and this method is applied to the first access device, the first access device and the second access device composition MLAG, and the two is connected by peer link VXLAN tunnels, and this method is：Receive the message for informing terminals address；If the interface for receiving message is the distributed aggregation port of this equipment, or, the distributed aggregation port ID that the interface for receiving the message is the peer link VXLAN tunnel faces of this equipment and message includes is virtual value, then determine that terminal dual homed corresponding to the terminal address accesses the first access device and the second access device, generate the first forwarding-table item, the occurrence of first forwarding-table item includes the terminal address, and the outgoing interface of the first forwarding-table item is distributed aggregation port of the terminal on the first access device.This MLAG deployment way need not take extra physical port and connect extra physical link.
Description
Technical field
The application is related to communication technical field, more particularly to a kind of forwarding table generation method and device.
Background technology
MLAG (English：Multi-chassis link aggregation group, referred to as：Striding equipment link aggregation group)
It is a kind of mechanism for realizing striding equipment link aggregation, is gathered by the way that one equipment is carried out into striding equipment link with other two equipment
Close, so as to which link reliability has been brought up to device level from single-plate grade, form dual-active system.
It is a kind of MLAG deployment schemes in Spine-Leaf (backbone-leaf) networking, in Fig. 1, terminal 2 referring to Fig. 1
Leaf2 equipment and Leaf3 equipment are arrived by the way that MLAG mechanism is dual-homed, the connector of Leaf2 equipment and Leaf3 equipment with terminal 2
The referred to as DYNAMIC DISTRIBUTION aggregation port (hereinafter referred to as distributed aggregation port) of MLAG agreements.Leaf2 equipment and Leaf3 equipment are
MLAG member, it is connected by a direct connected link therebetween, the link is commonly referred to as peer-link (peer link), peer-
Link can be used for exchanging negotiation packet and hop message, the direct-connected interface in peer-link both ends are referred to as peer-link and connect
Mouthful.
The content of the invention
In view of this, the application provides a kind of forwarding table generation method, a kind of without extra physical port work for providing
MLAG deployment way and corresponding forwarding table generation method for peer link mouths.
Specifically, the application is achieved by the following technical solution：
The application first aspect, there is provided a kind of forwarding-table item generation method, the first access device and the second access device
MLAG is formed, is connected between the first access device and the second access device by peer-link VXLAN tunnels, methods described should
For the first access device, including：
Receive the message for informing terminals address；
If the interface for receiving the message is the distributed aggregation port of this equipment, or, the interface for receiving the message is
The distributed aggregation port ID that the peer-link VXLAN tunnel faces of this equipment and the message include is virtual value, then
Determine that terminal dual homed corresponding to the terminal address accesses the first access device and the second access device, generation first
Forwarding-table item, the occurrence of first forwarding-table item include the terminal address, and the outgoing interface of first forwarding-table item is
Distributed aggregation port of the terminal on the first access device.
The application second aspect, there is provided a kind of forwarding-table item generating means, described device can apply to the first access
Equipment, the first access device and the second access device composition MLAG, pass through between the first access device and the second access device
Peer-link VXLAN tunnels connect.First access device has the function of realizing the above method.The function can be by hard
Part is realized, corresponding software can also be performed by hardware and is realized.The hardware or software include one or more and above-mentioned work(
Module or unit that can be corresponding.
In a kind of possible implementation, described device includes：
Receiving unit, for receiving the message for informing terminals address；
Forwarding-table item generation unit, for being the distributed aggregation port of this equipment in the interface for receiving the message, or,
The distributed aggregation port that the interface for receiving the message is the peer-link VXLAN tunnel faces of this equipment and the message includes
When ID is virtual value, determine that terminal dual homed corresponding to the terminal address accesses the first access device and the second access device, it is raw
Into the first forwarding-table item, the occurrence of first forwarding-table item includes the terminal address, and first forwarding-table item goes out
Interface is distributed aggregation port of the terminal on the first access device.
In alternatively possible implementation, described device includes communication interface, processor, memory and bus, described
It is connected with each other between communication interface, the processor and the memory by bus；The processor described in reading by depositing
The logical order stored in reservoir, perform the forwarding-table item generation method described in the application first aspect.
In this application, peer-link is realized by VXLAN tunnels between MLAG member, it is not necessary to take extra thing
Manage port and connect extra physical link.And because peer-link VXLAN tunnels are logical tunnel, therefore even if belong to
For same MLAG two MLAG members not in same computer room, physical location is apart from each other, will not also give between MLAG member
The deployment in peer-link VXLAN tunnels impacts.When MLAG member passes through peer-link VXLAN tunnel transmission messages
When, because the message is bound to carry VXLAN information, without carrying vlan information in messages, can so break existing
There is limitations of the VLAN to usable VXLAN example quantity in MLAG deployment schemes so that access device can be supported more
VXLAN examples.
Brief description of the drawings
Fig. 1 is MLAG deployment schemes schematic diagram of the prior art；
Message forwarding schematic diagram when Fig. 2 is MLAG member's failure of the prior art；
Fig. 3 is a kind of MLAG deployment schemes schematic diagram that the application provides；
Fig. 4 is the VXLAN tunnels schematic diagram in a kind of MLAG deployment schemes that the application provides；
Fig. 5 is the method flow diagram that the application provides；
Fig. 6 is the message format schematic diagram of the message for the peer-link VXLAN tunnel transmissions that the application provides；
Fig. 7 is the apparatus function module frame chart that the application provides；
Fig. 8 is the hardware architecture diagram for Fig. 7 shown devices that the application provides.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects be described in detail in claims, the application.
It is only merely for the purpose of description specific embodiment in term used in this application, and is not intended to be limiting the application.
" one kind " of singulative used in the application and appended claims, " described " and "the" are also intended to including majority
Form, unless context clearly shows that other implications.It is also understood that term "and/or" used herein refers to and wrapped
Containing the associated list items purpose of one or more, any or all may be combined.
It will be appreciated that though various information, but this may be described using term first, second, third, etc. in the application
A little information should not necessarily be limited by these terms.These terms are only used for same type of information being distinguished from each other out.For example, do not departing from
In the case of the application scope, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as
One information.Depending on linguistic context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determining ".
Existing MLAG deployment schemes may refer to shown in Fig. 1, and terminal 2 passes through MLAG mechanism and other two equipment
(Leaf2 equipment and Leaf3 equipment) carries out striding equipment link aggregation, collectively constitutes a dual-active system.It can so realize
Leaf2 equipment and Leaf3 equipment carry out the forwarding of flow jointly, ensure the reliability of network.
For example, when terminal 1 access terminal 2 when, terminal 1 can by load balancing by message be sent to Leaf2 equipment and
In Leaf3 equipment.Leaf2 equipment receives message and carries out VXLAN (Virtual Extensible LAN, virtual extended LAN)
Decapsulation, then forwards in corresponding VXLAN examples, is sent to terminal 2；Leaf3 equipment receives message and equally carries out VXLAN
Decapsulation, then forwards in corresponding VXLAN examples, is sent to terminal 2.
When user's sidelinks of MLAG member break down, the MLAG member of failure can pass through message
Peer-link is detoured to opposite end MLAG member, and message is sent into user side by opposite end MLAG member.For example, when in Fig. 1
When physical link between Leaf2 equipment and terminal 2 breaks down, the message that terminal 1 accesses terminal 2 is reached by load balancing
After Leaf2 equipment, the message can be carried out VXLAN decapsulations by Leaf2 equipment, then be detoured by peer-link to Leaf3
Equipment, it be may be referred to by Leaf3 device forwards to terminal 1, specific message repeating process shown in the dotted line in Fig. 2.
But in the prior art at least there is the defects of following three aspects in MLAG deployment schemes：
1st, extra physical port is needed between MLAG member to realize peer-link interfaces, and needs extra thing
Link is managed to realize peer-link, waste bandwidth and resource.
2nd, in some networkings, two MLAG members for belonging to same MLAG may not be in same computer room, physical location
Apart from each other, this brings difficulty for peer-link deployment.
3rd, when MLAG member is by peer-link transmitting messages, in order to allow opposite end MLAG member to know, the message belongs to
, it is necessary to carry vlan information in the message, such opposite end MLAG member can believe which VXLAN example according to the VLAN of message
Breath and the VXLAN and VLAN corresponding relation locally preserved, determine the VXLAN examples belonging to the message.But which also limits
The quantity of VXLAN examples can be used.For in theory, VLAN represents network segment name using 12bit VLAN ID, so as to the network segment
Number is limited in 2^12=4096；And VXLAN uses 24bit to be used as VXLAN identifiers so that the number of VXLAN examples expands
Open up 2^24.But in MLAG networking is deployed, in order to safeguard VLAN and VXLAN corresponding relation, workable VXLAN
The number of example is restricted to 4096.
The application provides a kind of new MLAG deployment schemes to solve the predicament faced at present.The MLAG that the application provides
Deployment scheme can apply to the network of any support MLAG agreements, such as EVPN (Ethernet Virtual Private
Network, Ethernet VPN) network, TRILL (Transparent Interconnection of Lotsof
Links, multi-link transparent interconnection) network etc..
Below by taking Spine-Leaf networkings as an example, illustrate the MLAG deployment schemes that the application provides.With reference to shown in figure 3,
In Spine-Leaf networkings, including equipment may include following three class by role：
Spine (backbone) equipment：Can be interchanger or router such as the Spine1 equipment and Spine2 equipment in Fig. 3,
Common IP (Internet Protocol, Internet protocol) is supported to forward.
Leaf (leaf) equipment：Such as the Leaf1 equipment in Fig. 3 to Leaf3 equipment, for the edge equipment of access terminal,
The application also refers to leaf equipment using access device sometimes.
Terminal：Can be virtual machine or physical host such as the terminal 1 in Fig. 3 to terminal 3.
In figure 3, Leaf1 equipment is a common access device；Leaf2 equipment and Leaf3 equipment enable MLAG agreements,
The two composition MLAG；The single access Leaf1 equipment of terminal 1；The single access Leaf2 equipment of terminal 2；The dual homed of terminal 3 accesses Leaf2 equipment
With Leaf3 equipment.
In the application, there is no peer-link, Leaf2 equipment and Leaf3 equipment between Leaf2 equipment and Leaf3 equipment
Using existing Spine-Leaf networkings, a special VXLAN tunnel is established in a network to realize existing peer-link's
Function, as shown by the dotted line in fig. 3.
For ease of distinguishing, in the application, will be used for realizing that peer-link tunnel is referred to as peer- between MLAG member
Link VXLAN tunnels, other VXLAN tunnels in network in addition to peer-link VXLAN tunnels are referred to as common VXLAN
Tunnel.Peer-link VXLAN tunnels can be used to transmit MLAG protocol massages and data message, MLAG protocol massages and datagram
Text need to carry out VXLAN encapsulation when being transmitted on peer-link VXLAN tunnels.For MLAG protocol massages, what it was encapsulated
VXLAN ID can be global VXLAN ID that are reserved, not accessing any terminal (i.e. tenant).It is it should be noted that different
MLAG different peer-link VXLAN tunnels can use different VXLAN ID, can also use identical VXLAN ID.
For data message, its VXLAN ID encapsulated is the VXLAN ID of the affiliated VXLAN examples of the data message.
In the application, the interface that non-dual homed terminal (such as terminal 1 and terminal 2) is connected in Leaf equipment is referred to as non-distributed
Aggregation port, the interface that dual homed terminal (such as terminal 3) is connected in Leaf equipment is referred to as distributed aggregation port, by peer-link
The direct-connected interface in VXLAN tunnels both ends is referred to as peer-link VXLAN tunnel faces.Wherein, non-distributed described in the application
Aggregation port is for distributed aggregation port, and non-distributed aggregation port refers to other outside distributed aggregation port type
The interface of type.Distributed aggregation port can be identified by distributed aggregation port ID, add same MLAG two distributions
The distributed aggregation port ID of formula aggregation port is identical.Non-distributed aggregation port and distributed aggregation port are equal physical interface,
Peer-link VXLAN tunnel faces are logic interfacing.
Due to the presence in peer-link VXLAN tunnels, Leaf2 equipment and the Leaf3 equipment for forming MLAG are each own 1
Real IP address and virtual IP address.So-called real IP address, for form MLAG two access devices as two physical equipments when pair
The IP address of outer embodiment；So-called virtual IP address, it is the MLAG of two access device compositions group address, that is, forms two of MLAG
The IP address of logical device when access device externally embodies a logical device.
Assuming that in figure 3, the IP address of Leaf1 equipment is 1.1.1.1, and the real IP address of Leaf2 equipment is 2.2.2.2,
The real IP address of Leaf3 equipment is 3.3.3.3, and the virtual IP address of Leaf2 equipment and Leaf3 equipment is 4.4.4.4, then each
VXLAN tunnels situation in Leaf equipment may refer to Fig. 4：
Three kinds of VXLAN tunnels in Leaf1 equipment be present, be respectively：
1) MLAG formed to Leaf2 equipment and Leaf3 equipment common VXLAN tunnels, its source IP address are
1.1.1.1, purpose IP address 4.4.4.4.
2) the common VXLAN tunnels of Leaf2 equipment are arrived, its source IP address is 1.1.1.1, purpose IP address 2.2.2.2.
This tunnel can be supported to access the terminal of this kind of single access Leaf2 equipment of terminal 2.
3) the common VXLAN tunnels of Leaf3 equipment are arrived, its source IP address is 1.1.1.1, purpose IP address 3.3.3.3.
This tunnel can be supported to access the terminal of single access Leaf3 equipment.
Two kinds of VXLAN tunnels in Leaf2 equipment be present, be respectively：
1) the peer-link VXLAN tunnels of Leaf3 equipment are arrived, its source IP address is 2.2.2.2, and purpose IP address is
3.3.3.3。
2) the common VXLAN tunnels of Leaf1 equipment are arrived, its source IP address is 4.4.4.4, purpose IP address 1.1.1.1.
Two kinds of VXLAN tunnels in Leaf3 equipment be present, be respectively：
1) the peer-link VXLAN tunnels of Leaf2 equipment are arrived, its source IP address is 3.3.3.3, and purpose IP address is
2.2.2.2。
2) the common VXLAN tunnels of Leaf1 equipment are arrived, its source IP address is 4.4.4.4, purpose IP address 1.1.1.1.
Common VXLAN tunnels and peer-link VXLAN tunnels can be established by EVPN agreements above, specific to establish
Process refers to existing realization, and the application is not described further.
The application substitutes existing physical link peer-link benefit to have using peer-link VXLAN tunnels：
1st, peer- need not be realized using the extra physical link of extra physical port and connection between MLAG member
link。
2nd, because peer-link VXLAN tunnels are logical tunnel, therefore even if belong to same MLAG two MLAG into
For member not in same computer room, physical location is apart from each other, the portion in the peer-link VXLAN tunnels that will not also give between MLAG member
Administration impacts.
3rd, when MLAG member is by peer-link VXLAN tunnel transmission messages, because the message can carry VXLAN letters
Breath, without carrying vlan information in messages, it can so break in existing MLAG deployment schemes VLAN to can be used
The limitation of VXLAN example quantity so that access device can support more VXLAN examples.
Below based on the MLAG deployment schemes shown in Fig. 1, forwarding-table item generating process when being reached the standard grade to terminal is described：
Assuming that the first access device and the second access device composition MLAG, between the first access device and the second access device
Connected by peer-link VXLAN tunnels, then referring to Fig. 5, when the end hung under the first access device and/or the second access device
When end is reached the standard grade, for the first access device, it, which generates the flow of forwarding-table item, may include following steps：
Step 501：First access device receives the message for informing terminals address.
Step 502：If the interface for receiving the message is the distributed aggregation port of this equipment, or, receive connecing for the message
Mouthful be the peer-link VXLAN tunnel faces of this equipment and distributed aggregation port ID that the message includes is virtual value, then first
Access device determines that terminal dual homed corresponding to the terminal address accesses the first access device and the second access device, generates first turn
Forwarding list item, the occurrence of the first forwarding-table item include the terminal address, and the outgoing interface of the first forwarding-table item is the terminal first
Distributed aggregation port on access device.
As one embodiment, if the interface that the message is received in step 502 is the non-distributed aggregation port of this equipment,
First access device can determine that terminal list corresponding to the terminal address accesses the first access device, and the first access device can give birth to
Into the second forwarding-table item, the occurrence of the second forwarding-table item includes the terminal address, and the outgoing interface of the second forwarding-table item is the end
Hold the non-distributed aggregation port on the first access device.
As further embodiment, if the interface that the message is received in step 502 is the peer-link VXLAN of this equipment
The distributed aggregation port ID that tunnel face and the message include is invalid value, then the first access device can determine the terminal address pair
The terminal list answered accesses the second access device, generates the 3rd forwarding-table item, the occurrence of the 3rd forwarding-table item is with including the terminal
Location, the outgoing interface of the 3rd forwarding-table item are the peer-link VXLAN tunnel faces of the first access device.
In this application, the MLAG member connected to it is sent into message after terminal is reached the standard grade, such as ARP (Address
Resolution Protocol, address resolution protocol) message, DHCP (Dynamic Host Configuration
Protocol, DHCP) message etc., to notice the terminal address of itself.Then by receive the MLAG of message into
The terminal address is packaged into VXLAN messages by member, and another MLAG member is transmitted to by peer-link VXLAN tunnels.Below
This process is described in detail so that message is sent to the first access device by terminal as an example.
Terminal selects to send message for noticing Self address to the first access device after reaching the standard grade, and the first access device leads to
After the physical link crossed between this equipment and the terminal receives the message, by judging incoming interface of the message in this equipment
It is distributed aggregation port or non-distributed aggregation port, it may be determined that the terminal is that dual homed access the first access device and second connects
Enter equipment, or the first access device of single access.
In the case of it is determined that incoming interface of the message in this equipment is distributed aggregation port, it is meant that send the message
Terminal dual homed access the first access device and the second access device, the first access device can further obtain the terminal at this
The distributed aggregation port ID (mark) of distributed aggregation port in equipment.Conversely, it is determined that the message enters to connect in this equipment
In the case that mouth is non-distributed aggregation port, it is meant that the terminal list for sending the message accesses the first access device, the first access
Distributed aggregation port ID corresponding to the terminal can be arranged to a setting value by equipment, and the setting value can be the first access device
The value appointed in advance with the second access device, such as full F values, gather for representing to send the distribution of the terminal of the message
The ID that heals up is invalid, and the terminal list accesses the first access device.
Next, the first access device can seal the distributed aggregation port ID determined and the terminal address of the terminal
It is attached in VXLAN messages, the VXLAN messages is sent to the second access device by peer-link VXLAN tunnels.
In the application, the form of the VXLAN messages transmitted on peer-link VXLAN tunnels may be referred to shown in Fig. 6, report
Literary internal layer includes IP address, MAC Address and the distributed aggregation port ID of terminal.Packet outer layer includes VXLAN heads, IP heads and MAC
Head, wherein, the VXLAN ID that VXLAN heads include are described being reserved for peer-link VXLAN tunnels, corresponding above
The source IP address and purpose IP address that VXLAN ID, the IP heads that VXLAN examples do not access any terminal include are respectively first to connect
Enter equipment and the real IP address of the second access device, the source MAC and target MAC (Media Access Control) address that MAC header includes are respectively first to connect
Enter the MAC Address of equipment and the second access device.
After second access device receives the VXLAN messages by peer-link VXLAN tunnels, first by the VXLAN messages
Decapsulated, therefrom get terminal address and distributed aggregation port ID.If the second access device can be from this equipment
Finding distributed aggregation port corresponding with the distributed aggregation port ID, then it is assumed that the distributed aggregation port ID is a virtual value,
Two access devices can be generated using the terminal address as matching based on the terminal address and the distributed formula aggregation port determined
, the forwarding-table item using distributed aggregation port of the terminal on the second access device as outgoing interface., whereas if the second access
Equipment finds that the distributed aggregation port ID that is got from VXLAN messages is the above-mentioned setting value appointed in advance, or this point
Cloth aggregation port ID is not the above-mentioned setting value appointed in advance but the second access device can not be found and this point from this equipment
Distributed aggregation port corresponding to cloth aggregation port ID, then it is assumed that the distributed aggregation port ID is invalid value, and the second access device can
Turned using generating using the terminal address as occurrence, using the peer-link VXLAN tunnel faces of the second access device as outgoing interface
Forwarding list item.
Described forwarding-table item can be MAC address entries and/or route table items in the application.
For Fig. 3, Leaf2 equipment and Leaf3 equipment composition MLAG, the dual homed of terminal 3 access Leaf2 equipment and
Leaf3 equipment, the single access Leaf2 equipment of terminal 2.Occurrence will be generated so after terminal 3 is reached the standard grade, in Leaf2 equipment as eventually
The MAC Address or IP address at end 3, the forwarding-table item that outgoing interface is the distributed aggregation port that Leaf2 equipment is connected with terminal 3.Together
Reason, also by generation occurrence it is the MAC Address of terminal 3 or IP address, outgoing interface are Leaf3 equipment with terminal 3 in Leaf3 equipment
The forwarding-table item of connected distributed aggregation port.And occurrence will be generated after terminal 2 is reached the standard grade, in Leaf2 equipment as terminal 2
MAC Address or IP address, the forwarding-table item that outgoing interface is the non-distributed aggregation port that Leaf2 equipment is connected with terminal 2, Leaf3
The peer-link VXLAN that occurrence is the MAC Address of terminal 2 or IP address, outgoing interface are Leaf3 equipment will be generated in equipment
The forwarding-table item of tunnel exit.
In the application, the first access device and the second access device are after the message for informing terminals address is received, also
Can by the terminal address by other procotols, such as BGP (Border Gateway Protocol, Border Gateway Protocol),
Other access devices are advertised to, such as the 3rd access device.Detailed process is as follows：
In the case where terminal dual homed accesses the first access device and the second access device, the first access device (or second
Access device) terminal address can be sent jointly to the 3rd access device together with the virtual IP address of the first access device, with
The 3rd access device is set to generate the 4th forwarding-table item, the occurrence of the 4th forwarding-table item includes the terminal address, the 4th forward table
The outgoing interface of item points to the virtual IP address that source address is the IP address of the 3rd access device, destination address is the first access device
Common VXLAN tunnels；Wherein, the virtual IP address is the group address for the MLAG that the first access device and the second access device form.
For Fig. 3 and Fig. 4, after the terminal 3 of dual homed access Leaf2 equipment and Leaf3 equipment is reached the standard grade, Leaf1 is set
Standby above to generate the MAC Address or IP address that occurrence is terminal 3, outgoing interface points to source IP address for 1.1.1.1, purpose IP
Location is 4.4.4.4 common VXLAN tunnels.
In the case where terminal list accesses the first access device, the first access device can be by the terminal address together with first
The real IP address of access device sends jointly to the 3rd access device, so that the 3rd access device generates the 5th forwarding-table item, the
The occurrence of five forwarding-table items includes the terminal address, and it is the 3rd access device that the outgoing interface of the 5th forwarding-table item, which points to source address,
IP address, destination address for the first access device real IP address common VXLAN tunnels；Wherein, first access device
Real IP address is the physical equipment IP address of the first access device.
Likewise, in the case where terminal list accesses the second access device, the second access device can be by the terminal address
The 3rd access device is sent jointly to together with the real IP address of the second access device, so that the forwarding of the 3rd access device generation the 6th
List item, the occurrence of the 6th forwarding-table item include the terminal address, and it is the 3rd that the outgoing interface of the 6th forwarding-table item, which points to source address,
The common VXLAN tunnels of the IP address of access device, the real IP address that destination address is the second access device；Wherein, second connect
The real IP address for entering equipment is the physical equipment IP address of the second access device.
For Fig. 3 and Fig. 4, after the terminal 2 for singly accessing Leaf2 equipment is reached the standard grade, generation is matched in Leaf1 equipment
Item is the MAC Address or IP address of terminal 2, and outgoing interface sensing source IP address is 1.1.1.1, purpose IP address is 2.2.2.2's
Common VXLAN tunnels.
The forwarding-table item generation method provided above the application is described.With reference to the networking shown in Fig. 3, it is situated between
Continuing, how the forwarding-table item based on generation carries out message forwarding.
It should be noted that in this application, each access device need to only E-Packet according to existing forwarding logic,
The outgoing interface specified is forwarded the packet to according to the instruction of forwarding-table item, decides whether to encapsulate according to the type of outgoing interface
Message, then message is sent by specified outgoing interface.
In turn below from two kinds of angles of unicast message and multicast message, to illustrate the specific repeating process of message.
1st, the repeating process of unicast message.
1) in one case, if some terminal list accesses above-mentioned first access device, the first access device is receiving
, can be according to above-mentioned second forwarding-table item, by the unicast message from the end when destination address is the unicast message of the terminal address
Hold the non-distributed aggregation port on the first access device to send, pass through the physical link between the first access device and the terminal
It is sent to the terminal.
It should be noted that in the case where some terminal list accesses the first access device, formed with the first access device
MLAG the second access device will not receive the unicast message that destination address is the terminal address.
For Fig. 3 and Fig. 4, message repeating process when terminal 1 accesses the terminal 2 hung under Leaf2 equipment is：Terminal
Message is sent to Leaf1 equipment by 1, Leaf1 equipment search MAC table or routing table (according to the target MAC (Media Access Control) address of message whether
Which table determined to search for the machine MAC Address), it is found that outgoing interface direction be common VXLAN tunnels, so as to be message encapsulation
VXLAN heads and outer layer IP heads, the purpose IP address of outer layer IP heads are the real IP address of Leaf2 equipment, i.e. 2.2.2.2, the report
Text is simply sent to Leaf2 equipment.Leaf2 equipment is decapsulated after receiving message, list item outlet is then inquired about, by decapsulation
Message is sent from Leaf2 equipment with the non-distributed aggregation port that terminal 2 is connected.
2) in another case, if some terminal dual homed accesses above-mentioned first access device and the second access device,
First access device receive destination address be the terminal address unicast message when, can according to above-mentioned first forwarding-table item,
Distributed aggregation port of the unicast message from the terminal on the first access device is sent, passes through the first access device and the end
Physical link between end is sent to the terminal.
It should be noted that in the case where some terminal dual homed accesses the first access device and the second access device, with
First access device composition MLAG the second access device can also receive the list that destination address is the terminal address because of load balancing
Text is reported, the second access device, with the first access device, is not repeated the retransmission method of the unicast message.
For Fig. 3 and Fig. 4, terminal 1 accesses the message forwarding during terminal 3 hung under Leaf2 equipment and Leaf3 equipment
Process is：Message is sent to Leaf1 equipment by terminal 1, and Leaf1 equipment searches MAC table or routing table, finds outgoing interface direction
For common VXLAN tunnels, so as to be message packaging V XLAN heads and outer layer IP heads, the purpose IP address of outer layer IP heads is Leaf1
The virtual IP address of equipment and Leaf2 equipment, i.e. 4.4.4.4, the message can be sent to Leaf2 equipment and Leaf3 equipment simultaneously.
Leaf2 equipment is decapsulated after receiving message, list item outlet is then inquired about, by the message of decapsulation from Leaf2 equipment with end
The connected distributed aggregation port in end 3 is sent.Equally, Leaf3 equipment is decapsulated after receiving message, and the report by decapsulation
Text is sent from Leaf3 equipment with the distributed aggregation port that terminal 3 is connected.
In the present embodiment, if the physical link between dual homed access MLAG terminal and one of MLAG member occurs
Failure, broken down than the physical link between such as above-mentioned terminal and the first access device, then the first access device will can be received
To unicast message another members of MLAG i.e. the second access device is sent to by peer-link VXLAN tunnels, connect by second
Enter equipment and the unicast message is sent to the terminal.Similarly, if the terminal occurs with the physical link before the second access device
Failure, then the second access device make same processing, the unicast message received is sent to the by peer-link VXLAN tunnels
One access device, the terminal is transmitted to by the first access device.
For Fig. 3 and Fig. 4, when the physical link between Leaf2 equipment and terminal 3 breaks down, terminal 1 accesses
After the message of terminal 3 reaches Leaf2 equipment, Leaf2 equipment finds that the state of the distributed aggregation port of this equipment connection terminal 3 is
Down, the source IP address of the outer layer IP heads of the message can be changed to the real IP address of capital equipment, i.e. 2.2.2.2, and incited somebody to action
The purpose IP address of the outer layer IP heads of the message is modified as the real IP address of Leaf3 equipment, i.e. 3.3.3.3, after then changing
Message Leaf3 equipment is sent to by peer-link VXLAN tunnels, Leaf3 equipment finds point of this equipment connection terminal 3
The state of cloth aggregation port is up, so as to be transmitted directly to terminal 3 after message is decapsulated.
2nd, the repeating process of multicast message (including multicast message and broadcasting packet).
In this application, to prevent multicast message loop, following rule is provided with the access device for deploy MLAG：
1) multicast message received for MLAG member from common VXLAN tunnels, it is allowed to which the MLAG member is by more reports
Text is forwarded by peer-link VXLAN tunnels.
, can be by the multicast message when Leaf2 equipment receives multicast message from common VXLAN tunnels for Fig. 3
Leaf3 equipment is sent to by peer-link VXLAN tunnels.
2) multicast sent by opposite end MLAG member received for local terminal MLAG member from peer-link VXLAN tunnels
Message, local terminal MLAG member is forbidden to forward the multicast message by common VXLAN tunnels.
, can be by the multicast message when Leaf2 equipment receives multicast message from common VXLAN tunnels for Fig. 3
Leaf3 equipment is sent to by peer-link VXLAN tunnels, and the multicast message can not be sent to net by Leaf3 equipment again
Network side, such as it is sent to Leaf1 equipment and Leaf2 equipment.
3) multicast sent by opposite end MLAG member received for local terminal MLAG member from peer-link VXLAN tunnels
Message, it is allowed to which local terminal MLAG member forwards the multicast message by non-distributed aggregation port
, can be by the multicast message when Leaf2 equipment receives multicast message from common VXLAN tunnels for Fig. 3
It is sent to single extension terminal 2.
4) multicast sent by opposite end MLAG member received for local terminal MLAG member from peer-link VXLAN tunnels
Message, if the physical link between opposite end MLAG member and dual homed terminal is normal, forbid local terminal MLAG by the multicast
Message is forwarded by distributed aggregation port.
Wherein, when opposite end MLAG member has found the physical link failure between dual homed terminal, failure thing can be sent
Part gives local terminal MLAG member；If local terminal MLAG member does not receive above-mentioned event of failure, it is considered that opposite end MLAG member with
Physical link between dual homed terminal is normal.
For Fig. 3, when Leaf2 equipment from peer-link VXLAN tunnels receive Leaf3 equipment transmission more reports
Wen Shi, if the physical link between Leaf3 and terminal 3 is normal, the multicast message can not be sent to dual homed by Leaf2 equipment
Terminal 3.
5) multicast sent by opposite end MLAG member received for local terminal MLAG member from peer-link VXLAN tunnels
Message, if the physical link failure between opposite end MLAG member and dual homed terminal, allow local terminal MLAG by the multicast
Message is forwarded by distributed aggregation port.
So regulation the reason for be, multicast message reaches two MLAG members by load balancing mode, therefore same
Individual message will not reach two MLAG members simultaneously, the feelings of the physical link failure between opposite end MLAG member and dual homed terminal
Under condition, to avoid the dual homed terminal from receiving telegraph less text, therefore the above-mentioned 4) article principle can be broken in this case, it is allowed to local terminal
The multicast message that MLAG member is received by the forwarding of distributed aggregation port from peer-link VXLAN tunnels.
For Fig. 3, when Leaf2 equipment from peer-link VXLAN tunnels receive Leaf3 equipment transmission more reports
Wen Shi, if the physical link failure between Leaf3 equipment and terminal 3, Leaf2 needs the multicast message being sent to dual homed
Terminal 3.
In summary, this application provides a kind of new MLAG deployment schemes and corresponding forwarding-table item generting machanism and
Message forwarding mechanism.In this application, peer-link is realized by VXLAN tunnels between MLAG member, it is not necessary to take extra
Physical port and connect extra physical link.And because peer-link VXLAN tunnels are logical tunnel, therefore even if
Belong to same MLAG two MLAG members not in same computer room, physical location is apart from each other, will not also give between MLAG member
The deployment in peer-link VXLAN tunnels impact.When MLAG member passes through peer-link VXLAN tunnel transmission messages
When, because the message is bound to carry VXLAN information, without carrying vlan information in messages, can so break existing
There is limitations of the VLAN to usable VXLAN example quantity in MLAG deployment schemes so that access device can be supported more
VXLAN examples.
The method provided above the application is described.The device provided below the application is described.
Referring to Fig. 7, a kind of functional block diagram of the forwarding-table item generating means provided for the application, the device can answer
For the first access device, the first access device and the second access device are grouped MLAG, the first access device and the second access
Connected between equipment by peer-link VXLAN tunnels.As shown in fig. 7, described device can include receiving unit 701, turn
Forwarding list item generation unit 702, port id determining unit 703 and transmitting element 704.
Receiving unit 701, for receiving the message for informing terminals address.
Forwarding-table item generation unit 702, for being the distributed aggregation port of this equipment in the interface for receiving the message, or
Person, receive the interface of the message and gather for the distribution that the peer-link VXLAN tunnel faces of this equipment and the message include
When the ID that heals up is virtual value, determine that terminal dual homed corresponding to the terminal address accesses the first access device and the second access is set
It is standby, the first forwarding-table item is generated, the occurrence of first forwarding-table item includes the terminal address, first forwarding-table item
Outgoing interface be distributed aggregation port of the terminal on the first access device.
In wherein a kind of embodiment, the forwarding-table item generation unit 702, it is additionally operable to：Receiving the message
When interface is the non-distributed aggregation port of this equipment, determine that terminal list corresponding to the terminal address accesses the first access device,
The second forwarding-table item is generated, the occurrence of second forwarding-table item includes the terminal address, second forwarding-table item
Outgoing interface is non-distributed aggregation port of the terminal on the first access device；It is this equipment in the interface of the reception message
Peer-link VXLAN tunnel faces and the distributed aggregation port ID that includes of message when being invalid value, determine the terminal
Terminal list corresponding to address accesses the second access device, generates the 3rd forwarding-table item, the occurrence bag of the 3rd forwarding-table item
The terminal address is included, the outgoing interface of the 3rd forwarding-table item is the peer-link VXLAN tunnel faces of the first access device.
In wherein a kind of embodiment, port id determining unit 703, for it is determined that the interface for receiving the message is
During the distributed aggregation port of this equipment, it is determined that receiving the distributed aggregation port ID of the interface of the message；
Transmitting element 704, for the distributed aggregation port ID determined and the terminal address to be encapsulated into VXLAN reports
Wen Zhong, the VXLAN messages are sent to the second access device by peer-link VXLAN tunnels, what the VXLAN messages included
VXLAN examples corresponding to VXLAN ID do not access any terminal.
In wherein a kind of embodiment, the transmitting element 704, it is used for：If it is determined that the terminal dual homed access first
Access device and the second access device, the then empty Internet protocol IP address by the terminal address together with the first access device
The 3rd access device is sent to, so that the 3rd access device generates the 4th forwarding-table item, the occurrence of the 4th forwarding-table item
Including the terminal address, it is the IP address of the 3rd access device, mesh that the outgoing interface of the 4th forwarding-table item, which points to source address,
Address for the first access device virtual IP address common VXLAN tunnels；Wherein, the virtual IP address is the first access device
With the MLAG of the second access device composition group address；If it is determined that the terminal list accesses the first access device, then by the end
End address sends jointly to the 3rd access device together with the real IP address of the first access device, so that the 3rd access device generation the
Five forwarding-table items, the occurrence of the 5th forwarding-table item include the terminal address, the outgoing interface of the 5th forwarding-table item
Sensing source address is the IP address of the 3rd access device, the common VXLAN for the real IP address that destination address is the first access device
Tunnel；Wherein, the real IP address of first access device is the physical equipment IP address of the first access device.
In wherein a kind of embodiment, when the terminal dual homed accesses the first access device and the second access device,
The receiving unit 701, it is additionally operable to receive the unicast message that destination address is the terminal address；
The transmitting element 704, if being broken down for the physical link between the terminal and the first access device,
The unicast message is sent to the second access device by peer-link VXLAN tunnels, by the second access device by the unicast
Message is sent to the terminal；If the physical link between the terminal and the first access device is normal, by the unicast message
The terminal is sent to by the physical link between the first access device and the terminal.
In wherein a kind of embodiment, the transmitting element 704, for more for being received from common VXLAN tunnels
Report text, it is allowed to forward the multicast message by peer-link VXLAN tunnels；For from peer-link VXLAN tunnels
The multicast message received, forbid forwarding the message by common VXLAN tunnels, and, if the second access device and the end
Physical link between end is normally then forbidden forwarding the multicast message by distributed aggregation port, if the second access device and institute
Stating the physical link failure between terminal then allows to forward the multicast message by distributed aggregation port.
So far, the description of Fig. 7 shown devices is completed.
Accordingly, present invention also provides the hardware configuration of Fig. 7 shown devices.Referring to Fig. 8, Fig. 8 is what the application provided
The hardware architecture diagram of Fig. 7 shown devices, the device include：Communication interface 801, processor 802, memory 803 and bus
804；Wherein, communication interface 801, processor 802, memory 803 complete mutual communication by bus 804.
Wherein, communication interface 801, for sending and receiving message.Processor 802 can be a CPU, memory 803
It can be nonvolatile memory (non-volatile memory), and forwarding-table item generation is stored with memory 803 and is patrolled
Instruction is collected, processor 802 can perform the forwarding-table item generation logical order stored in memory 803, to realize above-mentioned forwarding
List item generation method, flow shown in Figure 5.
So far, the hardware configuration description of Fig. 8 shown devices is completed.
The preferred embodiment of the application is the foregoing is only, not limiting the application, all essences in the application
God any modification, equivalent substitution and improvements done etc., should be included within the scope of the application protection with principle.
Claims (12)
1. a kind of forwarding-table item generation method, it is characterised in that the first access device and the second access device composition striding equipment chain
Road aggregation group MLAG, pass through peer link peer-link virtual extended locals between the first access device and the second access device
The connection of VXLAN tunnels is netted, methods described is applied to the first access device, including：
Receive the message for informing terminals address；
If the interface for receiving the message is the distributed aggregation port of this equipment, or, the interface for receiving the message is originally to set
The distributed aggregation port mark ID that standby peer-link VXLAN tunnel faces and the message include is virtual value, then
Determine that terminal dual homed corresponding to the terminal address accesses the first access device and the second access device, the forwarding of generation first
List item, the occurrence of first forwarding-table item include the terminal address, and the outgoing interface of first forwarding-table item is described
Distributed aggregation port of the terminal on the first access device.
2. the method as described in claim 1, it is characterised in that methods described also includes：
If the interface for receiving the message is the non-distributed aggregation port of this equipment, it is determined that terminal corresponding to the terminal address
The first access device of single access, generates the second forwarding-table item, and the occurrence of second forwarding-table item includes the terminal address,
The outgoing interface of second forwarding-table item is non-distributed aggregation port of the terminal on the first access device；
The distribution that if interface for receiving the message is the peer-link VXLAN tunnel faces of this equipment and the message includes
Aggregation port ID is invalid value, it is determined that terminal list corresponding to the terminal address accesses the second access device, the forwarding of generation the 3rd
List item, the occurrence of the 3rd forwarding-table item include the terminal address, and the outgoing interface of the 3rd forwarding-table item is first
The peer-link VXLAN tunnel faces of access device.
3. method as claimed in claim 2, it is characterised in that when the interface for receiving the message gathers for the distribution of this equipment
When healing up；Methods described also includes：
It is determined that receive the distributed aggregation port ID of the interface of the message；
The distributed aggregation port ID determined and the terminal address are encapsulated into VXLAN messages, the VXLAN messages are led to
Cross peer-link VXLAN tunnels and be sent to the second access device, corresponding to the VXLAN ID that the VXLAN messages include
VXLAN examples do not access any terminal.
4. method as claimed in claim 2, it is characterised in that methods described also includes：
If it is determined that the terminal dual homed accesses the first access device and the second access device, then by the terminal address together with first
The empty Internet protocol IP address of access device sends jointly to the 3rd access device, so that the forwarding of the 3rd access device generation the 4th
List item, the occurrence of the 4th forwarding-table item include the terminal address, and the outgoing interface of the 4th forwarding-table item points to source
Address is the IP address of the 3rd access device, the common VXLAN tunnels for the virtual IP address that destination address is the first access device；Its
In, the virtual IP address is the group address for the MLAG that the first access device and the second access device form；
If it is determined that the terminal list accesses the first access device, then the real IP by the terminal address together with the first access device
Location sends jointly to the 3rd access device, so that the 3rd access device generates the 5th forwarding-table item, the 5th forwarding-table item
Occurrence includes the terminal address, and the outgoing interface of the 5th forwarding-table item is with pointing to the IP that source address is the 3rd access device
Location, the common VXLAN tunnels for the real IP address that destination address is the first access device；Wherein, the reality of first access device
IP address is the physical equipment IP address of the first access device.
5. the method as described in claim 1, it is characterised in that the terminal dual homed accesses the first access device and the second access
Equipment；
Methods described also includes：
Receive the unicast message that destination address is the terminal address；
If the physical link between the terminal and the first access device breaks down, the unicast message is passed through into peer-
Link VXLAN tunnels are sent to the second access device, and the unicast message is sent into the terminal by the second access device；
If the physical link between the terminal and the first access device is normal, the unicast message is passed through into the first access device
Physical link between the terminal is sent to the terminal.
6. the method as described in claim 1, it is characterised in that methods described also includes：
For the multicast message received from common VXLAN tunnels, it is allowed to which the multicast message is passed through into peer-link VXLAN tunnels
Forwarding；
For the multicast message received from peer-link VXLAN tunnels, forbid the multicast message passing through common VXLAN tunnels
Forwarding；And if the physical link between the second access device and the terminal normally if forbid by the multicast message by point
Cloth aggregation port forwards, and allows to lead to the multicast message if the physical link failure between the second access device and the terminal
Cross distributed aggregation port forwarding.
7. a kind of forwarding-table item generating means, it is characterised in that the first access device and the second access device composition striding equipment chain
Road aggregation group MLAG, pass through peer link peer-link virtual extended locals between the first access device and the second access device
The connection of VXLAN tunnels is netted, described device is applied to the first access device, including：
Receiving unit, for receiving the message for informing terminals address；
Forwarding-table item generation unit, for being the distributed aggregation port of this equipment in the interface for receiving the message, or, receive
The distributed aggregation port mark that the interface of the message is the peer-link VXLAN tunnel faces of this equipment and the message includes
When ID is virtual value, determine that terminal dual homed corresponding to the terminal address accesses the first access device and the second access device, it is raw
Into the first forwarding-table item, the occurrence of first forwarding-table item includes the terminal address, and first forwarding-table item goes out
Interface is distributed aggregation port of the terminal on the first access device.
8. device as claimed in claim 7, it is characterised in that the forwarding-table item generation unit, be additionally operable to：
In non-distributed aggregation port of the interface for receiving the message for this equipment, terminal corresponding to the terminal address is determined
The first access device of single access, generates the second forwarding-table item, and the occurrence of second forwarding-table item includes the terminal address,
The outgoing interface of second forwarding-table item is non-distributed aggregation port of the terminal on the first access device；
In the distribution that the interface of the reception message is the peer-link VXLAN tunnel faces of this equipment and the message includes
When aggregation port ID is invalid value, determine that terminal list corresponding to the terminal address accesses the second access device, the forwarding of generation the 3rd
List item, the occurrence of the 3rd forwarding-table item include the terminal address, and the outgoing interface of the 3rd forwarding-table item is first
The peer-link VXLAN tunnel faces of access device.
9. device as claimed in claim 8, it is characterised in that described device also includes port id determining unit：
Port id determining unit, for it is determined that receive the message interface be this equipment distributed aggregation port when, it is determined that
Receive the distributed aggregation port ID of the interface of the message；
Transmitting element, sealed for the distributed aggregation port ID for determining the port id determining unit and the terminal address
It is attached in VXLAN messages, the VXLAN messages is sent to the second access device by peer-link VXLAN tunnels, should
The VXLAN examples corresponding to VXLAN ID that VXLAN messages include do not access any terminal.
10. device as claimed in claim 8, it is characterised in that described device also includes transmitting element；The transmitting element is used
In：
If it is determined that the terminal dual homed accesses the first access device and the second access device, then by the terminal address together with first
The empty Internet protocol IP address of access device sends jointly to the 3rd access device, so that the forwarding of the 3rd access device generation the 4th
List item, the occurrence of the 4th forwarding-table item include the terminal address, and the outgoing interface of the 4th forwarding-table item points to source
Address is the IP address of the 3rd access device, the common VXLAN tunnels for the virtual IP address that destination address is the first access device；Its
In, the virtual IP address is the group address for the MLAG that the first access device and the second access device form；
If it is determined that the terminal list accesses the first access device, then the real IP by the terminal address together with the first access device
Location sends jointly to the 3rd access device, so that the 3rd access device generates the 5th forwarding-table item, the 5th forwarding-table item
Occurrence includes the terminal address, and the outgoing interface of the 5th forwarding-table item is with pointing to the IP that source address is the 3rd access device
Location, the common VXLAN tunnels for the real IP address that destination address is the first access device；Wherein, the reality of first access device
IP address is the physical equipment IP address of the first access device.
11. device as claimed in claim 7, it is characterised in that terminal dual homed access first access device and second connects
Enter equipment；
The receiving unit, it is additionally operable to receive the unicast message that destination address is the terminal address；
Described device also includes transmitting element；
The transmitting element, if being broken down for the physical link between the terminal and the first access device, by the list
Report text and the second access device is sent to by peer-link VXLAN tunnels, sent out the unicast message by the second access device
Give the terminal；If the physical link between the terminal and the first access device is normal, the unicast message is passed through
Physical link between one access device and the terminal is sent to the terminal.
12. device as claimed in claim 7, it is characterised in that described device also includes transmitting element；
The transmitting element, for the multicast message for being received from common VXLAN tunnels, it is allowed to which the multicast message is passed through
Peer-link VXLAN tunnels forward；For the multicast message received from peer-link VXLAN tunnels, forbid the message
By common VXLAN tunnels forward, and, if the physical link between the second access device and the terminal normally if forbid by
The multicast message is forwarded by distributed aggregation port, is permitted if the physical link failure between the second access device and the terminal
Perhaps the multicast message is forwarded by distributed aggregation port.
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