CN108259304B - Forwarding table item synchronization method and device - Google Patents

Forwarding table item synchronization method and device Download PDF

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CN108259304B
CN108259304B CN201711454167.5A CN201711454167A CN108259304B CN 108259304 B CN108259304 B CN 108259304B CN 201711454167 A CN201711454167 A CN 201711454167A CN 108259304 B CN108259304 B CN 108259304B
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evpn route
interface
forwarding table
distributed aggregation
evpn
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CN108259304A (en
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黄李伟
王伟
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Hangzhou H3C Technologies Co Ltd
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Hangzhou H3C Technologies Co Ltd
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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
    • 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
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • 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
    • H04L45/44—Distributed routing
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

The application provides a method and a device for synchronizing forwarding table entries, wherein the method can be applied to any VTEP device in a distributed aggregation system, and comprises the following steps: receiving a first EVPN route announcement message from a VTEP at an opposite end; checking whether the source of the first EVPN route notification message is in the same distributed aggregation system with the equipment; and when the source of the first EVPN route notification message and the device are in the same distributed aggregation system, generating a first forwarding table entry according to the first EVPN route notification message. Because the EVPN route notification message is adopted to synchronize the forwarding table entry, the synchronization speed of the forwarding table entry in the distributed aggregation system can be improved.

Description

Forwarding table item synchronization method and device
Technical Field
The present application relates to the field of computer communications, and in particular, to a method and an apparatus for synchronizing forwarding entries.
Background
EVPN (Ethernet Virtual Private Network) is a two-layer VPN technology, where BGP (Border Gateway Protocol) is used on the control plane to advertise routing information, and VXLAN (Virtual eXtensible local area Network) is used on the data plane to forward user packets.
Fig. 1 illustrates a Distributed aggregation system, such as a DR (Distributed aggregation) system, in EVPN networking. In the networking shown in fig. 1, VTEP11(VXLAN Tunnel End Point) and VTEP12 may constitute a DR system. VTEP11 and VTEP12 may be connected to VM11(virtual machine) via a distributed aggregation interface, and VM11 is connected to VTEP11 and VTEP12 via a common aggregation interface.
Usually, the table entry synchronization between VTEP devices in the DR system is performed by Rlink (Reliable link), for example, after VTEP11 learns the forwarding table entry of the MAC address of VM11, VTEP11 may synchronize the learned forwarding table entry to VTEP12 by Rlink. However, Rlink may be shared by many modules on the device, so that Rlink may not only synchronize entries, but also forward data traffic. Therefore, when VTEP11 synchronously forwards the table entry to VTEP12 through Rlink, the table entry to be synchronized is forwarded together with the data traffic, which causes congestion and greatly reduces the synchronization speed of the forwarding table entry.
Disclosure of Invention
In view of the above, the present application provides a method and an apparatus for synchronizing forwarding entries, so as to increase a synchronization speed of forwarding entries in a DR system.
Specifically, the method is realized through the following technical scheme:
according to a first aspect of the present application, a forwarding table synchronization method is provided, where the method is applied to any VTEP device in a distributed aggregation system, and includes:
receiving a first EVPN route announcement message from a VTEP at an opposite end;
checking whether the source of the first EVPN route notification message is in the same distributed aggregation system with the equipment;
when the source of the first EVPN route notification message and the device are in the same distributed aggregation system, generating a first forwarding table entry according to the first EVPN route notification message; the MAC address of the first forwarding table entry is an MAC address carried in the first EVPN route advertisement message, the egress interface is a distributed aggregation DR interface carried in the first EVPN route advertisement message, and the first forwarding table entry corresponds to a virtual switch instance VSI associated with an extensible virtual local area network VXLAN identifier carried in the first EVPN route advertisement message.
Optionally, the checking that the source of the first EVPN route advertisement message and the device are in the same distributed aggregation system includes:
and detecting whether the value of the designated field of the first EVPN route announcement message is a preset value or not, and whether the distributed aggregation address of the first EVPN route announcement message is the same as the distributed aggregation address of the equipment or not.
Optionally, the method further includes:
after learning that the output interface is a second forwarding table entry of the distributed aggregation DR interface, constructing a second Ethernet virtual private network EVPN route notification message corresponding to the second forwarding table entry;
and broadcasting the second EVPN route notification message to synchronize the second forwarding table item to other VTEP equipment connected with the equipment in the distributed aggregation system to which the equipment belongs.
Optionally, the generating a first forwarding table entry according to the first EVPN route advertisement message includes:
acquiring the MAC address, the VXLAN identifier and the DR interface identifier carried in the first EVPN routing notification message;
detecting whether a VSI corresponding to the obtained VXLAN identifier and a DR interface corresponding to the obtained DR interface identifier exist on the equipment;
if yes, generating a first forwarding table entry; the MAC address of the first forwarding table entry is the acquired MAC address, the output interface is the acquired DR interface, and the first forwarding table entry corresponds to the acquired VSI associated with the VXLAN identifier.
Optionally, the method further includes:
if the value of the designated field of the first EVPN route notification message is not the preset value, or the distributed aggregation address carried by the first EVPN route notification message is different from the distributed aggregation address of the equipment, generating a third forwarding table entry according to the first EVPN route notification message; the MAC address of the third forwarding entry is the MAC address carried in the first EVPN route notification message, and the egress interface is a VXLAN tunnel interface for receiving the first EVPN route notification message.
According to a second aspect of the present application, there is provided a forwarding table synchronization apparatus, which is applied to any scalable virtual local area network tunnel endpoint VTEP device in a distributed aggregation system, and includes:
the receiving unit is used for receiving a first EVPN route notification message from a VTEP of an opposite end;
the checking unit is used for checking whether the source of the first EVPN route notification message is in the same distributed aggregation system with the equipment;
a generating unit, configured to generate a first forwarding table entry according to the first EVPN route advertisement message when it is checked that a source of the first EVPN route advertisement message and the device are in the same distributed aggregation system; the MAC address of the first forwarding table entry is an MAC address carried in the first EVPN route advertisement message, the egress interface is a distributed aggregation DR interface carried in the first EVPN route advertisement message, and the first forwarding table entry corresponds to a virtual switch instance VSI associated with an extensible virtual local area network VXLAN identifier carried in the first EVPN route advertisement message.
Optionally, the checking unit is specifically configured to detect whether a value of a specified field of the first EVPN route advertisement message is a preset value, and whether a distributed aggregation address of the first EVPN route advertisement message is the same as a distributed aggregation address of the device.
Optionally, the apparatus further comprises:
the learning unit is used for constructing a second Ethernet virtual private network EVPN route notification message corresponding to a second forwarding table entry after learning that the outgoing interface is the second forwarding table entry of the distributed aggregation DR interface;
and the broadcasting unit is used for broadcasting the second EVPN route notification message so as to synchronize the second forwarding table entry to other VTEP equipment connected with the equipment in the distributed aggregation system to which the equipment belongs.
Optionally, the generating unit is specifically configured to acquire the MAC address, the VXLAN identifier, and the DR interface identifier carried in the first EVPN route advertisement message; detecting whether a VSI corresponding to the obtained VXLAN identifier and a DR interface corresponding to the obtained DR interface identifier exist on the equipment; if yes, generating a first forwarding table entry; the MAC address of the first forwarding table entry is the acquired MAC address, the output interface is the acquired DR interface, and the first forwarding table entry corresponds to the acquired VSI associated with the VXLAN identifier.
Optionally, the generating unit is further specifically configured to generate a third forwarding table entry according to the first EVPN route notification message if a value of the specified field of the first EVPN route notification message is not the preset value, or a distributed aggregation address carried in the first EVPN route notification message is different from a distributed aggregation address of the local device; the MAC address of the third forwarding entry is the MAC address carried in the first EVPN route notification message, and the egress interface is a VXLAN tunnel interface for receiving the first EVPN route notification message.
The application provides a method for synchronizing forwarding table items, which can use EVPN route notification information to synchronize forwarding table items when synchronous forwarding table items are needed among VTEPs in a DR system.
On one hand, as the network equipment of each company supports the BGP EVPN protocol, the EVPN routing notification message based on the BGP EVPN protocol is adopted to synchronously forward the table entries, and the limitation that the Rlink based on the private protocol is not matched with the network equipment is avoided; on the other hand, the routing quantity carried by the EVPN routing advertisement message based on the BGP EVPN protocol is very large, and no longer uses Rlink for forwarding data traffic and forwarding table entries simultaneously to synchronize the forwarding table entries, so congestion is no longer generated when the table entries are synchronously forwarded, thereby greatly improving the efficiency of synchronizing forwarding table entries between VTEP devices in the DR system.
Drawings
Fig. 1 is a schematic diagram of a network architecture of EVPN employing a distributed aggregation system according to an exemplary embodiment of the present application;
fig. 2 is a flowchart illustrating a method for synchronizing forwarding entries according to an exemplary embodiment of the present application;
fig. 3 is a hardware structure diagram of an apparatus where a forwarding table synchronization apparatus is located according to an exemplary embodiment of the present application;
fig. 4 is a block diagram illustrating a forwarding table entry synchronization apparatus according to an exemplary embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In EVPN networking employing a distributed aggregation system as shown in fig. 1, VTEP11 and VTEP12 may constitute a distributed aggregation system, i.e., a DR system. The DR system is connected to a remote VTEP13 via a VXLAN tunnel. Specifically, VTEP11 and VTEP12 in the DR system are connected to a remote VTEP13, respectively, via VXLAN tunnels.
Each VTEP in the networking is respectively connected with a corresponding host. The host may include a Virtual Machine VM (Virtual Machine) or a server, and the host is not particularly limited herein.
For example, VTEP13 is connected to VM13 and VTEP12 is connected to VM 12. VTEP11 and VTEP12 are connected to VM11 via a distributed aggregate interface, and VM11 is connected to VTEP11 and VTEP12 via a common aggregate interface.
Specifically, Port13 connected to VTEP11 on VM11 and Port14 connected to VTEP12 on VM11 are added to the common aggregate interface Aggr1 interface. Port11 on VTEP11 connected to VM11 and Port12 on VTEP12 connected to VM11 join distributed aggregation interface DR interface 1. An AC port, AC100, is created on DR interface 1.
Assume that the significance of this AC100 is: if the data message entering from the physical port ten1/0/1 carries tag10, the data message will enter vsivpnb for forwarding. Where vpnb is the name of VSI (Virtual Switch Instance). VTEP11 and VTEP12 are also configured with VSIvpnb, which is assumed to correspond to VXLAN 100.
Still taking the networking shown in fig. 1 as an example, the following briefly introduces a forwarding table synchronization process between VTEP devices in the above DR system in the related art.
The VM11 can send the traffic flow to the DR system through the ordinary aggregation interface Aggr1, and assume that the VLAN TAG carried by the traffic flow is TAG10, and the source MAC address of the traffic flow is 1-1-1.
During the sending process, VM11 may hash one of the two links locally with VTEP11 and VTEP12 for traffic forwarding. Assume that the hashed link is a link between the local and VTEP 11. VM11 may send the traffic to VTEP11 over the hashed link.
VTEP11 may receive the traffic sent by VM11 from DR interface 1 described above. VTEP11 may determine from DR interface 1 the AC100 configured on DR interface 1. With the AC100, VTEP11 may determine that tag10 carried by the traffic matches VSI vpnb.
VTEP11 may then learn the source MAC address of the traffic into the forwarding entry for the VSI vpnb, the learned forwarding entry being shown in table 1.
MAC address Status of state VSI name Outlet interface
1-1-1 Dynamic vpnb DR interface 1
TABLE 1
Wherein, Dynamic indicates that the forwarding table entry is learned by traffic Dynamic trigger.
Since the link hashed by VM11 is the link between VM11 and VTEP11, only VTEP11 may receive the traffic, learn the MAC address of the traffic, and form the forwarding table shown in table 1. And no forwarding table entry is generated at VTEP 12. At this time, the forwarding table entry generated on VTEP11 needs to be synchronized to VTEP 12.
In the existing synchronization process, the VTEP11 needs to send an Rlink synchronization message to the VTEP12 through Rlink, where the synchronization message carries a forwarding entry to be synchronized. After receiving the forwarding table entry synchronized with VTEP11, VTEP12 may detect whether there are VSI (i.e., VSI vpnb) and DR interface (i.e., DR interface 1) in the forwarding table entry synchronized with VTEP12, and if so, generate and send the forwarding table entry (e.g., table 1) carried in the synchronization packet to the forwarding chip.
However, the synchronous forwarding of the table entry from VTEP11 to VTEP12 is synchronized by Rlink, and on one hand, Rlink synchronization is based on private protocol synchronization, which makes VTEP devices in the DR system need to match with the private protocol, which imposes limitation on the synchronization of forwarding table entries; on the other hand, Rlink can be shared by a plurality of modules on the device, so that Rlink can not only synchronize the table entries, but also forward data traffic, so that the forwarding table entries and the data traffic are forwarded together, congestion is caused, and the synchronization speed of the forwarding table entries is greatly reduced.
In view of this, the present application provides a method for synchronizing forwarding entries, which can use EVPN route advertisement message to synchronize forwarding entries when synchronous forwarding entries are needed between VTEPs in a DR system.
On one hand, as the network equipment of each company supports the BGP EVPN protocol, the EVPN routing notification message based on the BGP EVPN protocol is adopted to synchronously forward the table entries, and the limitation that the Rlink based on the private protocol is not matched with the network equipment is avoided; on the other hand, the routing quantity carried by the EVPN routing advertisement message based on the BGP EVPN protocol is very large, and no longer uses Rlink for forwarding data traffic and forwarding table entries simultaneously to synchronize the forwarding table entries, so congestion is no longer generated when the table entries are synchronously forwarded, thereby greatly improving the efficiency of synchronizing forwarding table entries between VTEP devices in the DR system.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for synchronizing forwarding entries according to an exemplary embodiment of the present application. The method can be applied to any VTEP device in a DR system of the distributed aggregation system. For convenience of description, any one of the VTEP devices is referred to as a first VTEP, and any other VTEP connected to the first VTEP in the DR system to which the first VTEP belongs is referred to as a second VTEP.
For convenience of description, the EVPN neighbor route advertisement message received by the device (first VTEP) is referred to as a first EVPN route advertisement message.
When the source of the first EVPN route advertisement message and the device are in the same distributed aggregation system, the forwarding table entry corresponding to the first EVPN route advertisement message is recorded as a first forwarding table entry.
And recording a forwarding table entry corresponding to the first EVPN route notification message as a third forwarding table entry when the source of the first EVPN route notification message and the device are not in the same distributed aggregation system.
And broadcasting the EVPN route advertisement message which is broadcasted to the EVPN neighbor equipment by the equipment (the first VTEP) as a second EVPN route advertisement message.
And recording the forwarding table generated by learning the MAC address of the local host by the equipment (the first VTEP) as a second forwarding table.
Step 201: a first EVPN route advertisement message is received from a peer VTEP.
Step 202: checking whether the source of the first EVPN route announcement message is in the same distributed aggregation system with the device.
Step 203: when the source of the first EVPN route notification message and the device are in the same distributed aggregation system, generating a first forwarding table entry according to the first EVPN route notification message; the MAC address of the first forwarding table entry is the MAC address carried in the first EVPN route advertisement message, the egress interface is the DR interface carried in the first EVPN route advertisement message, and the first forwarding table entry corresponds to the VSI associated with the VXLAN identifier carried in the first EVPN route advertisement message.
In an embodiment of the present application, the first VTEP may detect whether the source of the first EVPN route advertisement message is in the same distributed aggregation system as the device.
Specifically, the first VTEP may detect whether a value of a specified field of the first EVPN route advertisement message is a preset value.
If the value of the designated field of the first EVPN route advertisement message is a preset value, it can be further detected whether the distributed aggregation address carried by the first EVPN route advertisement message is the same as the distributed aggregation address of the device.
And if the distributed aggregation address carried by the first EVPN route notification message is the same as the distributed aggregation address of the equipment, determining that the source of the first EVPN route notification message and the equipment are in the same distributed aggregation system.
If the value of the designated field of the first EVPN route advertisement message is not a preset value, or if the distributed aggregation address carried by the first EVPN route advertisement message is different from the distributed aggregation address of the device, determining that the source of the first EVPN route advertisement message and the device are not in the same distributed aggregation system, and at this time, the first VTEP may determine that the first EVPN route advertisement message is a common route advertisement message sent by a remote VTEP.
It should be noted that the above-mentioned detection of the first EVPN route advertisement message is mainly used to distinguish whether the first EVPN route advertisement message is an EVPN route advertisement message sent by another VTEP (e.g. the first VTEP) in the DR system to which the first VTEP belongs, or a normal EVPN route advertisement message sent by another remote VTEP.
In this embodiment of the present application, when it is determined that a source of a first EVPN route advertisement message and the device are in the same distributed aggregation system, the first VTEP may generate a first forwarding entry according to the first EVPN route advertisement message, where a MAC address of the first forwarding entry is a MAC address carried in the first EVPN route advertisement message, an output interface is a DR interface carried in the first EVPN route advertisement message, and the first forwarding entry corresponds to a VSI associated with a VXLAN identifier carried in the first EVPN route advertisement message. The first VTEP may also issue the generated first forwarding table entry to the forwarding chip.
Specifically, when the first forwarding table entry is generated, the first VTEP may obtain the MAC address carried in the first EVPN route notification message, the VXLAN identifier corresponding to the MAC address, and the DR interface identifier corresponding to the MAC address.
The first VTEP may then check whether the device is configured with a VSI corresponding to the obtained VXLAN identifier and a DR interface corresponding to the obtained DR interface identifier.
Specifically, the device is preconfigured with a corresponding relationship between a VXLAN identifier and a VSI, the VXLAN identifier that the first VTEP can acquire is used as a keyword, and in the corresponding relationship between the VXLAN identifier and the VSI, it is detected whether a VSI matching the keyword exists, and the first VTEP also needs to detect whether a DR interface corresponding to the DR interface identifier exists on the device.
If the VSI corresponding to the obtained VXLAN identifier and the DR interface corresponding to the DR interface identifier exist on the equipment, generating a first forwarding table entry; the MAC address of the first forwarding table entry is the acquired MAC address, and the output interface is the acquired DR interface.
If the VSI corresponding to the obtained VXLAN identifier does not exist on the device or the DR interface corresponding to the DR interface identifier does not exist on the device, the first VTEP may record the information carried in the first EVPN route notification message, but does not generate a forwarding table entry or issue the forwarding table entry.
When determining that the source of the first EVPN route advertisement message and the device are not in the same distributed aggregation system, the first VTEP may determine that the first EVPN route advertisement message is a normal route advertisement message sent by the remote VTEP, and at this time, the first VTEP may generate and issue a forwarding table according to the normal EVPN route advertisement message.
Specifically, the first VTEP may generate a third forwarding entry according to the first EVPN route advertisement message. The MAC address of the third forwarding entry is the MAC address carried in the first EVPN route advertisement message, and the egress interface is a VXLAN tunnel interface for receiving the first EVPN route advertisement message.
In addition, in this embodiment of the present application, after learning that the outgoing interface is a second forwarding table entry of the distributed aggregation DR interface, the first VTEP may further construct a second EVPN route notification message corresponding to the second forwarding table entry, and broadcast the second EVPN route notification message, so as to synchronize the second forwarding table entry to other VTEP devices connected to the local VTEP device in the distributed aggregation system to which the local VTEP device belongs.
During implementation, after the first VTEP device learns the second forwarding table of the MAC address of the VM connected to the first VTEP device, the first VTEP may determine whether the output interface of the second forwarding table is the DR interface of the distributed aggregation interface. And if the output interface of the second forwarding table entry is a DR interface, constructing a second EVPN route notification message corresponding to the second forwarding table entry based on a BGP EVPN protocol, and broadcasting the second EVPN route notification message so as to synchronize the second forwarding table entry to other VTEP equipment connected with the equipment in a distributed aggregation system to which the equipment belongs. And if the output interface of the first forwarding table entry is not the DR interface, not synchronizing the second forwarding table entry.
When the first VTEP constructs the second EVPN route notification message corresponding to the second forwarding table, the first VTEP may use a value of a designated field of the constructed second EVPN route notification message as a preset value, and the constructed second EVPN route notification message carries the distributed aggregation address of the local device (the first VTEP), the MAC address of the second forwarding table, the VXLAN identifier of the VXLAN corresponding to the VSI of the second forwarding table, and the DR interface identifier of the outgoing interface of the second forwarding table.
The first VTEP may then broadcast the constructed second EVPN route advertisement message to a peer VTEP of the first VTEP.
The application provides a method for synchronizing forwarding table items, which can use EVPN route notification information to synchronize forwarding table items when synchronous forwarding table items are needed among VTEPs in a DR system.
On one hand, as the network equipment of each company supports the BGP EVPN protocol, the EVPN routing notification message based on the BGP EVPN protocol is adopted to synchronously forward the table entries, and the limitation that the Rlink based on the private protocol is not matched with the network equipment is avoided; on the other hand, the routing quantity carried by the EVPN routing advertisement message based on the BGP EVPN protocol is very large, and no longer uses Rlink for forwarding data traffic and forwarding table entries simultaneously to synchronize the forwarding table entries, so congestion is no longer generated when the table entries are synchronously forwarded, thereby greatly improving the efficiency of synchronizing forwarding table entries between VTEP devices in the DR system.
The following describes in detail a synchronization method for forwarding entries in the embodiment of the present application by taking the networking shown in fig. 1 as an example.
First, the following basic configuration is described.
VTEP11 and VTEP12 constitute a DR system, and it is assumed that the distributed aggregation address of the DR system is 1.2.3.4, and is recorded on both VTEP11 and VTEP 12.
Both VTEP11 and VTEP12 are provided with a correspondence between VSI and VXLAN, for example, a correspondence between VSI vpnb and VXLAN 100.
In addition, DR systems are created with a DR interface that can be added by designated physical ports on VTEP11 and VTEP 12. The AC port of the VSI may be configured on the created DR interface. Furthermore, VTEP11 and VTEP12 record the correspondence between the DR interface, the physical port included in the DR interface, and the correspondence between the DR interface and the AC port.
For example, assuming that a DR system is created with DR interface 1, physical Port11 of VTEP11 and physical Port12 on VTEP12 may join DR interface 1. An AC port, such as AC100, may be configured on the DR interface 1, and the configuration of the AC100 may be as follows:
assume that AC100 represents: data messages entering from the physical Port ten1/0/1 (assumed to be Port11) enter vsi vpnb for forwarding if tag10 is carried.
Furthermore, VTEP11 records the correspondence relationship between DR interface 1 and Port11, and the correspondence relationship between DR interface 1 and AC 100. The VTEP12 records the correspondence between the DR interface 1 and the Port12, and the correspondence between the DR interface 1 and the AC 100.
A common aggregation interface Aggr1 is created on the VM11, and a Port13 and a Port14 on the VM11 are added to the common aggregation interface Aggr 1. The VM11 is connected with a distributed aggregation interface DR interface 1 in the DR system through a common aggregation interface Aggr 1.
Furthermore, VTEP11, VTEP12, and VTEP13 may establish EVPN neighbor relations.
Next, a method for synchronizing forwarding entries according to an embodiment of the present application is described in detail.
The VM11 can send the traffic flow to the DR system through the ordinary aggregation interface Aggr1, and assume that the VLAN TAG carried by the traffic flow is TAG10, and the source MAC address of the traffic flow is 1-1-1.
During the sending process, VM11 may hash one of the two links locally with VTEP11 and VTEP12 for traffic forwarding. Assume that the hashed link is a link between the local and VTEP 11. VM11 may send the traffic to VTEP11 over the hashed link.
VTEP11 may receive the traffic sent by VM11 from DR interface 1 described above. VTEP11 may determine from DR interface 1 the AC100 configured on DR interface 1. From the configuration information in the AC100, VTEP11 may determine that tag10 carried by the traffic matches VSI vpnb.
VTEP11 may then learn the source MAC address of the traffic into the forwarding entry for the VSI vpnb, the learned forwarding entry being shown in table 1.
After learning the forwarding table entry shown in table 1, VTEP11 may detect whether the outgoing interface of the forwarding table entry is a distributed aggregation interface, that is, a DR interface, and if the outgoing interface of the forwarding table entry is not a distributed aggregation interface, not synchronize the forwarding table entry to VTEP 12. If the outgoing interface of the forwarding table entry is a distributed aggregation interface, an EVPN route advertisement message corresponding to the learned forwarding table entry is constructed, and the EVPN route advertisement message is broadcasted to the opposite VTEP of VTEP11, where the EVPN route advertisement message may be used to synchronize the forwarding table entries as shown in table 1.
In this example, when VTEP11 determines that the outgoing interface of the forwarding entry is DR interface 1, the distributed aggregation interface, VTEP11 may construct an EVPN route advertisement message matching the forwarding entry. The designated field in the constructed EVPN route advertisement message is a preset value and carries the distributed aggregation address of the device (VTEP 11).
Wherein, the specified field and the distributed aggregation address of the device may be carried in an extended community attribute of the EVPN route advertisement message. The extended community attributes are shown in table 2:
Figure BDA0001528942010000131
TABLE 2
The Type field indicates the extended community attribute Type, the Type field may be the designated field, and 0x07 may be the preset value. When the value of the Type field is 0x07, it indicates that the EVPN route advertisement message is an EVPN route advertisement message sent by a distributed aggregation system, such as a VTEP in a DR system.
The Reserved field may be a Reserved field.
The EVPN route address field is used to fill the distributed aggregation address of the VTEP that sent the EVPN route advertisement message. In this example, this field fills out the distributed aggregate address of VTEP11, e.g., 1.2.3.4.
In addition, the EVPN route advertisement message also carries the MAC address (for example, MAC address 1-1-1) of the forwarding table entry shown in table 1, the VXLAN identifier (i.e., VXLAN 100) corresponding to the VSI in the forwarding table entry, and the DR interface identifier (i.e., DR interface 1) of the outgoing interface DR interface 1 of the forwarding table entry.
VTEP11 may broadcast EVPN route advertisement messages to its peer VTEPs (e.g., VTEP12, VTEP13, etc.).
Furthermore, VTEP11 may also receive EVPN route advertisement messages sent by the peer VTEP, e.g., VTEP11 may receive EVPN route advertisement messages sent by VTEP12 or VTEP 13.
VTEP11 may perform steps 301 through 304.
Step 301: VTEP11 receives EVPN route advertisement messages broadcast by a peer VTEP.
Step 302: VTEP11 may detect whether the source of the received EVPN route advertisement message is in the same distributed aggregation system as the device.
When implemented, VTEP11 may detect whether a specified field of the EVPN route advertisement message is a preset value. For example, the VTEP11 may check whether the value of the Type field in the extended community attribute in the EVPN route advertisement message is 0x 07.
If VTEP11 detects that the specified field of the EVPN route advertisement message is not a preset value, then it is determined that the source of the EVPN route advertisement message is not in the same distributed aggregation system as the device.
If VTEP11 detects that the specified field of the EVPN route advertisement message is a preset value, VTEP11 may further detect whether the distributed aggregation address carried in the EVPN route advertisement message is the same as the distributed aggregation address of the device.
If VTEP11 detects that the distributed aggregation address carried in the EVPN route advertisement message is not the same as the distributed aggregation address of the device, it may be determined that the source of the EVPN route advertisement message is not in the same distributed aggregation system as the device.
If VTEP11 detects that the distributed aggregation address carried in the EVPN route advertisement message is the same as the distributed aggregation address of the device, it may be determined that the source of the EVPN route advertisement message is in the same distributed aggregation system as the device.
In this example, VTEP11 detects that the specified field of the EVPN route advertisement message is a preset value, and detects that the distributed aggregation address 1.2.3.4 carried in the EVPN route advertisement message is the same as the distributed aggregation address 1.2.3.4 of the device, so VTEP11 may determine that the source of the EVPN route advertisement message is in the same distributed aggregation system as the device.
Step 303: when VTEP11 determines that the source of the EVPN route advertisement message is in the same distributed aggregation system as the device, VTEP11 may generate a forwarding entry corresponding to the EVPN route advertisement message. The MAC address of the forwarding table entry is the MAC address carried in the EVPN route advertisement message, and the egress interface is the DR interface carried in the EVPN route advertisement message and corresponding to the MAC address. The forwarding table entry corresponds to the VSI associated with the VXLAN identifier carried in the EVPN route advertisement message.
In implementation, the VTEP11 may obtain the MAC address (i.e., MAC address 1-1-1) carried in the EVPN route advertisement message, the VXLAN identifier (VXLAN 100) corresponding to the MAC address, and the DR interface identifier (i.e., DR interface 1) corresponding to the MAC address.
VTEP11 may then detect whether there is a VSI corresponding to the obtained VXLAN identifier (i.e., VXLAN 100) and a DR interface corresponding to the obtained DR interface identifier (DR interface 1) on the device.
Specifically, VTEP11 detects whether or not there is a VSI corresponding to VXLAN 100 on the device in the locally configured correspondence between VXLAN and VSI, and VTEP11 may detect whether or not DR interface 1 is created locally.
If VTEP11 detects that there are a vsi (vsi vpnb) corresponding to the obtained VXLAN identifier (i.e., VXLAN 100) and a DR interface corresponding to the DR interface identifier (DR interface 1) on the device, it may generate a forwarding table entry of the vsi (vsi vpnb) and issue the generated forwarding table entry to a forwarding chip.
The forwarding table entry of VSI vpnb is shown in table 3. The MAC address of the forwarding entry is the obtained MAC (i.e., MAC address 1-1-1), and the egress interface is the obtained DR interface (e.g., DR interface 1).
MAC address Status of state VSI name Outlet interface
1-1-1 EVPN vpnb DR interface 1
TABLE 3
The EVPN in the column of the state in table 3 indicates that the forwarding entry is synchronized with the EVPN route advertisement message.
If the VTEP11 detects that the VSI corresponding to the obtained VXLAN identifier and the DR interface corresponding to the DR interface identifier do not exist on the device. At this time, VTEP11 may record the routing information carried in the EVPN route advertisement message, but does not generate a forwarding table entry, nor issue a forwarding table entry corresponding to the routing information.
Step 304: when VTEP11 determines that the source of the EVPN route advertisement message and the device are not in the same distributed aggregation system, VTEP11 may generate a forwarding entry corresponding to the EVPN route advertisement message, where a MAC address of the forwarding entry is a MAC address carried in the EVPN route advertisement message, and an egress interface is a VXLAN tunnel interface that receives the EVPN route advertisement message.
In this embodiment of the application, when the VTPE11 determines that the specified field of the EVPN route advertisement message is not a preset value, or that the distributed aggregation address carried in the EVPN route advertisement message is different from the distributed aggregation address of the device, the VTEP11 may generate a forwarding entry corresponding to the EVPN route advertisement message, where the MAC address of the forwarding entry is the MAC address carried in the EVPN route advertisement message, and the outgoing interface is a VXLAN tunnel interface that receives the EVPN route advertisement message.
The application provides a method for synchronizing forwarding table items, which can use EVPN route notification information to synchronize forwarding table items when synchronous forwarding table items are needed among VTEPs in a DR system.
On one hand, as the network equipment of each company supports the BGP EVPN protocol, the EVPN routing notification message based on the BGP EVPN protocol is adopted to synchronously forward the table entries, and the limitation that the Rlink based on the private protocol is not matched with the network equipment is avoided; on the other hand, the routing quantity carried by the EVPN routing advertisement message based on the BGP EVPN protocol is very large, and no longer uses Rlink for forwarding data traffic and forwarding table entries simultaneously to synchronize the forwarding table entries, so congestion is no longer generated when the table entries are synchronously forwarded, thereby greatly improving the efficiency of synchronizing forwarding table entries between VTEP devices in the DR system.
Referring to fig. 3, the present application further provides a hardware architecture diagram of an apparatus, such as a VTEP apparatus, where a forwarding table synchronization apparatus is located, the apparatus includes: a communication interface 301, a processor 302, a memory 303, and a bus 304; wherein, the communication interface 301, the processor 302 and the memory 303 complete the communication with each other through the bus 304.
Wherein, the communication interface 301 is used for communicating with the server. Processor 302 may be a CPU, memory 303 may be a non-volatile memory (non-volatile memory), and memory 303 stores logic instructions for synchronizing forwarding entries, and processor 302 may execute the logic instructions for synchronizing forwarding entries stored in memory 303 to implement the function of synchronizing forwarding entries.
Up to this point, the description of the hardware configuration shown in fig. 3 is completed.
Referring to fig. 4, fig. 4 is a block diagram illustrating a forwarding table entry synchronization apparatus according to an exemplary embodiment of the present application. The device can be applied to any VTEP in a DR system. The apparatus may comprise the following elements.
A receiving unit 401, configured to receive a first EVPN route advertisement message from a peer VTEP;
a checking unit 402, configured to check whether a source of the first EVPN route advertisement message is in the same distributed aggregation system as the device;
a generating unit 403, configured to generate a first forwarding entry according to the first EVPN route advertisement message when it is checked that the source of the first EVPN route advertisement message and the device are in the same distributed aggregation system; the MAC address of the first forwarding table entry is the MAC address carried in the first EVPN route advertisement message, the egress interface is the DR interface carried in the first EVPN route advertisement message, and the first forwarding table entry corresponds to the VSI associated with the VXLAN identifier carried in the first EVPN route advertisement message.
Optionally, the checking unit 402 is specifically configured to detect whether a value of a specified field of the first EVPN route advertisement message is a preset value, and whether a distributed aggregation address of the first EVPN route advertisement message is the same as a distributed aggregation address of the device.
Optionally, the apparatus further comprises:
a learning unit 404, configured to construct a second ethernet virtual private network EVPN route advertisement message corresponding to a second forwarding table entry after learning that the egress interface is the second forwarding table entry of the distributed aggregation DR interface;
a broadcasting unit 405, configured to broadcast the second EVPN route advertisement message, so as to synchronize the second forwarding table to other VTEP devices connected to the local device in the distributed aggregation system to which the local device belongs.
Optionally, the generating unit 403 is specifically configured to acquire the MAC address, the VXLAN identifier, and the DR interface identifier carried in the first EVPN route advertisement message; detecting whether a VSI corresponding to the obtained VXLAN identifier and a DR interface corresponding to the obtained DR interface identifier exist on the equipment; if yes, generating a first forwarding table entry; the MAC address of the first forwarding table entry is the acquired MAC address, the output interface is the acquired DR interface, and the first forwarding table entry corresponds to the acquired VSI associated with the VXLAN identifier.
Optionally, the generating unit 403 is further specifically configured to generate a third forwarding table entry according to the first EVPN route notification message if a value of the specified field of the first EVPN route notification message is not the preset value, or a distributed aggregation address carried in the first EVPN route notification message is different from a distributed aggregation address of the local apparatus; the MAC address of the third forwarding entry is the MAC address carried in the first EVPN route notification message, and the egress interface is a VXLAN tunnel interface for receiving the first EVPN route notification message.
The implementation process of the functions and actions of each unit in the above device is specifically described in the implementation process of the corresponding step in the above method, and is not described herein again.
For the device embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of the application. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims (10)

1. A method for synchronizing forwarding table entries is applied to any extensible virtual local area network tunnel endpoint (VTEP) equipment in a distributed aggregation system, and comprises the following steps:
receiving a first Ethernet Virtual Private Network (EVPN) route advertisement message from a peer VTEP;
checking whether the source of the first EVPN route notification message is in the same distributed aggregation system with the equipment;
when the source of the first EVPN route notification message and the device are in the same distributed aggregation system, generating a first forwarding table entry according to the first EVPN route notification message; the MAC address of the first forwarding table entry is an MAC address carried in the first EVPN route advertisement message, the egress interface is a distributed aggregation DR interface carried in the first EVPN route advertisement message, and the first forwarding table entry corresponds to a virtual switch instance VSI associated with an extensible virtual local area network VXLAN identifier carried in the first EVPN route advertisement message.
2. The method of claim 1, wherein the checking that the source of the first EVPN route advertisement message is in the same distributed aggregation system as the device comprises:
and detecting whether the value of the designated field of the first EVPN route announcement message is a preset value or not, and whether the distributed aggregation address of the first EVPN route announcement message is the same as the distributed aggregation address of the equipment or not.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
after learning that the output interface is a second forwarding table entry of the distributed aggregation DR interface, constructing a second EVPN route notification message corresponding to the second forwarding table entry;
and broadcasting the second EVPN route notification message to synchronize the second forwarding table item to other VTEP equipment connected with the equipment in the distributed aggregation system to which the equipment belongs.
4. The method of claim 1, wherein said generating a first forwarding entry based on said first EVPN route advertisement message comprises:
acquiring the MAC address, the VXLAN identifier and the DR interface identifier carried in the first EVPN routing notification message;
detecting whether a VSI corresponding to the obtained VXLAN identifier and a DR interface corresponding to the obtained DR interface identifier exist on the equipment;
if yes, generating a first forwarding table entry; the MAC address of the first forwarding table entry is the acquired MAC address, the output interface is the acquired DR interface, and the first forwarding table entry corresponds to the acquired VSI associated with the VXLAN identifier.
5. The method of claim 2, further comprising:
if the value of the designated field of the first EVPN route notification message is not the preset value, or the distributed aggregation address carried by the first EVPN route notification message is different from the distributed aggregation address of the equipment, generating a third forwarding table entry according to the first EVPN route notification message; the MAC address of the third forwarding entry is the MAC address carried in the first EVPN route notification message, and the egress interface is a VXLAN tunnel interface for receiving the first EVPN route notification message.
6. A forwarding table synchronization device is applied to any extensible virtual local area network tunnel endpoint (VTEP) equipment in a distributed aggregation system, and comprises:
the receiving unit is used for receiving a first EVPN route notification message from a VTEP of an opposite end;
the checking unit is used for checking whether the source of the first EVPN route notification message is in the same distributed aggregation system with the equipment;
a generating unit, configured to generate a first forwarding table entry according to the first EVPN route advertisement message when it is checked that a source of the first EVPN route advertisement message and the device are in the same distributed aggregation system; the MAC address of the first forwarding table entry is an MAC address carried in the first EVPN route advertisement message, the egress interface is a distributed aggregation DR interface carried in the first EVPN route advertisement message, and the first forwarding table entry corresponds to a virtual switch instance VSI associated with an extensible virtual local area network VXLAN identifier carried in the first EVPN route advertisement message.
7. The apparatus according to claim 6, wherein the checking unit is specifically configured to detect whether a value of a specified field of the first EVPN route advertisement message is a preset value, and whether a distributed aggregation address of the first EVPN route advertisement message is the same as a distributed aggregation address of the device.
8. The apparatus of claim 6 or 7, further comprising:
the learning unit is used for constructing a second Ethernet virtual private network EVPN route notification message corresponding to a second forwarding table entry after learning that the outgoing interface is the second forwarding table entry of the distributed aggregation DR interface;
and the broadcasting unit is used for broadcasting the second EVPN route notification message so as to synchronize the second forwarding table entry to other VTEP equipment connected with the equipment in the distributed aggregation system to which the equipment belongs.
9. The apparatus according to claim 6, wherein the generating unit is specifically configured to obtain a MAC address, a VXLAN identifier, and a DR interface identifier carried in the first EVPN route advertisement message; detecting whether a VSI corresponding to the obtained VXLAN identifier and a DR interface corresponding to the obtained DR interface identifier exist on the equipment; if yes, generating a first forwarding table entry; the MAC address of the first forwarding table entry is the acquired MAC address, the output interface is the acquired DR interface, and the first forwarding table entry corresponds to the acquired VSI associated with the VXLAN identifier.
10. The apparatus according to claim 7, wherein the generating unit is further specifically configured to generate a third forwarding entry according to the first EVPN route advertisement message if a value of a specified field of the first EVPN route advertisement message is not the preset value, or a distributed aggregation address carried in the first EVPN route advertisement message is different from a distributed aggregation address of the local device; the MAC address of the third forwarding entry is the MAC address carried in the first EVPN route notification message, and the egress interface is a VXLAN tunnel interface for receiving the first EVPN route notification message.
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