CN105704257A - Media access control (MAC) address election method and device - Google Patents

Abstract

The present invention provides a method for media access control MAC address election, which is applied to a cross-frame link aggregation group MC-LAG. The method includes: when the trigger condition is met, perform aggregation calculation on MC-LAG; And when the aggregation is successful, obtain the system MAC address of each frame of the MC-LAG, and determine the interface MAC address of the MC-LAG from the system MAC addresses of each frame of the MC-LAG according to a predetermined election rule. The above solution uses the existing MC-LAG protocol packets to implement MC-LAG interface MAC address election, so that the same MAC address can be selected for the MC-LAG interfaces of different chassis in the same MC-LAG group. The current VRRP solution does not need to open other protocols or add new links.

Description

Method and device for media access control MAC address election

technical field

The present invention relates to network communication technology, and specifically designs a method and device for MAC (MediaAccessControl, Media Access Control) address election of MC-LAG (Multi-ChassisLinkAggregationGroup, cross-chassis link aggregation group).

Background technique

With the rapid development of the Internet, IP networks have gradually become an indispensable tool in people's daily work and life.

In an IP communication network, in order to avoid single node failure at the network uplink egress, we can choose to deploy MC-LAG cross-chassis link aggregation group to realize redundant backup of uplink egress links and nodes. As shown in Figure 1, we deploy MC-LAG between Node 2 and Node 3, and bind the two links interconnected with Node 1 into an MC-LAG cross-chassis link aggregation group. When a single node fails such as node 2 downtime, MC-LAG will automatically switch all the uplink egress traffic of node 1 to node 3.

For a network communication device such as an Ethernet switch, its system MAC address has been assigned and set before leaving the factory and is required to be globally unique. It cannot be the same as the MAC address of other network nodes, otherwise it may cause MAC address conflicts.

At present, common Ethernet switch devices in the industry directly use the system MAC address of the node for the MAC address of the MC-LAG interface. As shown in Figure 2, the MAC address of the MC-LAG interface of node 2 is the system MAC address of node 2, The MAC address of the MC-LAG interface of node 3 is the system MAC address of node 3, which causes the problem that the MAC addresses of the MC-LAG interfaces of different chassis in the same MC-LAG group are different.

When MC-LAG is deployed in the Layer 3 forwarding scenario across network segments, different aggregated links in the same MC-LAG cross-chassis link aggregation group will use different MAC addresses as the Ethernet addresses of forwarded data frames. The destination MAC address in the network header. As shown in the example shown in Figure 3, we configure the IP address 10.80.1.254 on the MC-LAG interfaces of Node 2 and Node 3 as the gateway IP address of the users connected to Node 1. In this way, when the service traffic is forwarded from the left link, the destination MAC address field in the Ethernet header of the data frame of the service traffic will be filled with the system MAC address of node 2; when the service traffic is forwarded from the right link, the service traffic The destination MAC address field in the Ethernet header of the traffic data frame will be filled with the system MAC address of node 3. This will cause the gateway ARP (Address Resolution Protocol, Address Resolution Protocol) entry on the user host to change repeatedly and the problem of service traffic packet loss.

In order to solve the above problems, the current solution commonly used in the industry is to deploy VRRP (VirtualRouterRedundancyProtocol, Virtual Router Redundancy Protocol) on the MC-LAG interfaces of node 2 and node 3 so that MC-LAG uses the same VRRP virtual MAC address to as the interface MAC address. However, this scheme currently has the following shortcomings:

1. This solution needs to additionally enable the VRRP protocol. VRRP is an additional overhead for the system's CPU and other resources. Moreover, each network segment must independently enable a VRRP group, so that when an MC-LAG interface carries traffic from multiple network segments at the same time, it is necessary to enable a corresponding number of VRRP groups.

2. Each VRRP group needs to occupy a real IP address and a virtual IP address, which is a waste of IP address resources

3. It is necessary to deploy an additional heartbeat link for VRRP between node 2 and node 3, which will increase the network construction cost and maintenance workload.

Invention content:

The invention provides a method and device for MAC address election to solve the problem that the MAC addresses of MC-LAG interfaces of different machine frames of the same MC-LAG group are not the same.

In order to solve the above technical problems, the present invention provides a method for media access control MAC address election, which is applied to a cross-chassis link aggregation group MC-LAG, and the method includes:

When the trigger condition is met, perform aggregation calculation on the MC-LAG;

When the aggregation calculation ends and the aggregation is successful, obtain the system MAC address of each frame of the MC-LAG, and determine the MC-LAG from the system MAC addresses of each frame of the MC-LAG according to a predetermined election rule MAC address of the interface.

further,

The trigger condition is that the MC-LAG completes initialization, or the MC-LAG adds/deletes members.

further,

Obtain the system MAC address of each frame of the MC-LAG, and determine the interface MAC address of the MC-LAG from the system MAC addresses of each frame of the MC-LAG according to a predetermined election rule when the aggregation calculation is successful , determining the interface MAC address of the MC-LAG according to a predetermined election rule includes:

When the aggregation calculation is successful, obtain the system MAC address of each frame of the MC-LAG from the protocol message of the MC-LAG;

The system MAC address with the smallest value among the system MAC addresses of each chassis is used as the interface MAC address of the MC-LAG.

further,

After said determining the interface MAC address of the MC-LAG according to the predetermined election rules, it also includes:

sending an ARP message to each network segment, where the ARP message carries the interface MAC address of the MC-LAG determined according to the predetermined election rule.

further,

After the aggregation calculation of the MC-LAG is performed, it also includes:

When the aggregation calculation fails, wait for a new aggregation calculation of the MC-LAG.

The present invention also provides a device for media access control MAC address election, which is applied to a cross-frame link aggregation group MC-LAG, and the device includes:

A calculation module, configured to perform aggregate calculation on the MC-LAG when a trigger condition is met;

An election module, configured to obtain the system MAC address of each frame of the MC-LAG when the aggregation calculation is completed and the aggregation is successful, and determine from the system MAC addresses of each frame of the MC-LAG according to a predetermined election rule MAC address of the MC-LAG interface.

further,

The trigger condition is that the MC-LAG completes initialization, or the MC-LAG adds/deletes members.

further,

The election module is used to obtain the system MAC addresses of each frame of the MC-LAG when the aggregation calculation is successfully completed and the aggregation is successful, and select from the system MAC addresses of each frame of the MC-LAG according to a predetermined election rule Determining the interface MAC address of the MC-LAG refers to:

When the aggregation calculation is successful, obtain the system MAC address of each frame of the MC-LAG from the protocol message of the MC-LAG;

The system MAC address with the smallest value among the system MAC addresses of each chassis is used as the interface MAC address of the MC-LAG.

Further, the device also includes:

A communication module, configured to send an ARP message to each network segment after the election module determines the interface MAC address of the MC-LAG according to predetermined election rules, and the ARP message carries the MC-LAG determined according to predetermined election rules. MAC address of the interface of the LAG.

Further, the device also includes:

A processing module, configured to wait for a new aggregation calculation of the MC-LAG when the aggregation calculation fails.

The above solution is based on the existing MC-LAG protocol to solve the problem that the MC-LAG interface MAC addresses of different chassis in the same MC-LAG group are not the same, and implement MC-LAG by borrowing the existing MC-LAG protocol packets Interface MAC address election, so that the same MAC address can be selected for the MC-LAG interfaces of different chassis in the same MC-LAG group. Compared with the existing VRRP solution, there is no need to open other protocols or add new links.

Description of drawings

Figure 1 is a schematic diagram of MC-LAG link switching;

FIG. 2 is a schematic diagram of MAC address information of an MC-LAG interface in the prior art;

Fig. 3 is a schematic diagram of the MAC address information of the MC-LAG interface in the three-layer forwarding scenario of the MC-LAG cross-network segment in the prior art;

Fig. 4 is a schematic diagram of the MAC address information of the MC-LAG interface in the three-layer forwarding scenario of the MC-LAG cross-network segment in Embodiment 1 of the present invention;

FIG. 5 is a flowchart of a method for MAC address election in Embodiment 1 of the present invention;

FIG. 6 is a schematic diagram of an apparatus for MAC address election in Embodiment 1 of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the application clearer, the embodiments of the application will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

At present, the existing MC-LAG protocol will periodically exchange MC-LAG protocol packets between the chassis that have joined the MC-LAG aggregation group to update and maintain the link aggregation status. The protocol message is a standard Ethernet data frame structure, and the source MAC address in the Ethernet header is filled with the system MAC address of the sending node. The source MAC address in the Ethernet header of the MC-LAG protocol message is filled with the system MAC address of the node that sends the message during the periodical exchange between each chassis of the MC-LAG aggregation group. After the calculation of the group is completed and the aggregation is successful, a MAC address election processing link of the MC-LAG interface is added.

Embodiment one

The present application provides a method for media access control MAC address election, which is applied to a cross-chassis link aggregation group MC-LAG, and the method includes:

Step 1. When the trigger condition is met, perform aggregation calculation on the MC-LAG;

Step 2. When the aggregation calculation is successfully completed and the aggregation is successful, obtain the system MAC address of each frame of the MC-LAG, and determine the system MAC address of each frame of the MC-LAG according to a predetermined election rule. MAC address of the interface on the MC-LAG.

The above solution is based on the existing MC-LAG protocol to solve the problem that the MC-LAG interface MAC addresses of different chassis in the same MC-LAG group are not the same, and implement MC-LAG by borrowing the existing MC-LAG protocol packets Interface MAC address election, so that the same MAC address can be selected for the MC-LAG interfaces of different chassis in the same MC-LAG group. Compared with the existing VRRP solution, there is no need to open other protocols or add new links.

In the above technical solution, the MC-LAG may be used to complete the initialization, or the MC-LAG may add/delete members as a trigger condition for aggregation calculation.

When the aggregation calculation ends successfully and the aggregation is successful, obtain the system MAC address of each frame of the MC-LAG from the protocol message of the MC-LAG; The MAC address is used as the interface MAC address of the MC-LAG.

When the aggregation calculation fails, it waits for a new aggregation calculation of the MC-LAG.

Optionally, can also include

Step 3: Send an ARP message to each network segment, and the ARP message carries the interface MAC address of the MC-LAG determined according to the predetermined election rule.

It should be noted that, for the MAC address election rules of the MC-LAG interface, the MAC address of the selected shelf system with the smallest value can be used as the MAC address of the MC-LAG interface. The characteristics of the MC-LAG protocol itself are used to define the MAC address election rules of different MC-LAG interfaces. Just ensure that all the chassis of the MC-LAG aggregation group elect the same MAC address as the MAC address of the MC-LAG interface. That's it.

Embodiment two

As shown in FIG. 4 and FIG. 5 , the technical solution of the present invention is further described in combination with specific scenarios.

Step 1-2: MC-LAG aggregation group initialization or MC-LAG aggregation group member leaving/new member joining triggers new aggregation calculation;

Step 3: After the MC-LAG aggregation calculation is completed, determine whether the aggregation is successful; if the aggregation is successful, perform step 4, and if the aggregation fails, perform step 7;

Step 4: Each frame of the aggregation group extracts the system MACs of all member frames of the MC-LAG aggregation group from the MC-LAG protocol message, and selects the one with the smallest MAC value as the MAC address of the MC-LAG interface;

If the aggregation fails, the MAC election process will not be performed, and it will directly jump to the end state to wait for a new round of aggregation calculation process;

Step 5: After the MAC election process ends, determine whether the system has enabled the interface MAC change notification function. If the notification function is turned on, go to step 6; if the notification function is not turned on, go to step 7;

Step 6: The system sends gratuitous ARP from the Layer 3 interface where the MC-LAG is located. If there are multiple network segments, it needs to send one copy for each network segment.

The purpose of sending this ARP is to quickly notify other nodes in the LAN that the MAC address of the Layer 3 interface where the MC-LAG is located has changed, so that other nodes in the LAN can quickly update the local ARP cache table.

Step 7: This address election is over, waiting for the conditions to trigger the next departure address election.

As shown in FIG. 6, the present invention also provides a device for media access control MAC address election, which is applied to a cross-chassis link aggregation group MC-LAG, and the device includes:

A calculation module 11, configured to perform aggregate calculation on the MC-LAG when a trigger condition is met;

The election module 12 is configured to determine the interface MAC address of the MC-LAG according to a predetermined election rule when the aggregation calculation is successful.

Further, the trigger condition is that the MC-LAG completes the initialization, or the MC-LAG adds/deletes members.

further,

The election module is used to determine the interface MAC address of the MC-LAG according to a predetermined election rule when the aggregation calculation is successful:

When the aggregation calculation is successful, obtain the system MAC address of each frame of the MC-LAG from the protocol message of the MC-LAG;

The system MAC address with the smallest value among the system MAC addresses of each chassis is used as the interface MAC address of the MC-LAG.

Further, the device also includes:

The communication module 13 is configured to send an ARP message to each network segment after the election module determines the interface MAC address of the MC-LAG according to predetermined election rules, and the ARP message carries the MC determined according to predetermined election rules. -MAC address of the interface of the LAG.

Further, the device also includes:

The processing module 14 is configured to wait for a new aggregation calculation of the MC-LAG when the aggregation calculation fails.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a magnetic disk or an optical disk, and the like. Optionally, all or part of the steps in the above embodiments can also be implemented using one or more integrated circuits. Correspondingly, each module/module in the above embodiments can be implemented in the form of hardware, or can be implemented in the form of software function modules. The form is realized. This application is not limited to any specific form of combination of hardware and software.

Claims (10)

1. a method for medium access control MAC Address election, is applied to across machine frame link aggregation group MC-LAG, it is characterised in that described method includes:

When a triggering condition is met, described MC-LAG carries out polymerization to calculate；

When described polymerization calculates and terminates and be polymerized successfully, obtain the system MAC Address of each machine frame of described MC-LAG, from the system MAC Address of each machine frame of described MC-LAG, determine the interface mac address of described MC-LAG according to predetermined election regulation。

2. the method for claim 1, it is characterised in that:

Described trigger condition is that described MC-LAG completes to initialize, or described MC-LAG increase/removing members。

3. method as claimed in claim 2, it is characterised in that:

Obtain the system MAC Address of each machine frame of described MC-LAG, from the system MAC Address of each machine frame of described MC-LAG, determine that the interface mac address of described MC-LAG includes according to predetermined election regulation:

The system MAC Address of each machine frame of described MC-LAG is obtained from the protocol massages of described MC-LAG；

Using the system MAC Address minimum for numerical value in the system MAC Address of each machine frame interface mac address as described MC-LAG。

4. method as claimed in claim 3, it is characterised in that:

Also include after the described interface mac address determining described MC-LAG according to predetermined election regulation:

Sending ARP message to each network segment, described ARP message carries the interface mac address of the described MC-LAG determined according to predetermined election regulation。

5. the method as described in as arbitrary in Claims 1-4, it is characterised in that:

Described described MC-LAG is carried out also includes after polymerization calculates:

When described polymerization calculates unsuccessfully, then wait that polymerization new for described MC-LAG calculates。

6. a device for medium access control MAC Address election, is applied to across machine frame link aggregation group MC-LAG, it is characterised in that described device includes:

Computing module, calculates for described MC-LAG carries out polymerization when a triggering condition is met；

Election module, for when described polymerization calculates and terminates and be polymerized successfully, obtaining the system MAC Address of each machine frame of described MC-LAG, determine the interface mac address of described MC-LAG according to predetermined election regulation from the system MAC Address of each machine frame of described MC-LAG。

7. device as claimed in claim 6, it is characterised in that:

Described trigger condition is that described MC-LAG completes to initialize, or described MC-LAG increase/removing members。

8. device as claimed in claim 7, it is characterised in that:

Described election module, for obtaining the system MAC Address of each machine frame of described MC-LAG, determines that the interface mac address of described MC-LAG refers to according to predetermined election regulation from the system MAC Address of each machine frame of described MC-LAG:

The system MAC Address of each machine frame of described MC-LAG is obtained from the protocol massages of described MC-LAG；

Using the system MAC Address minimum for numerical value in the system MAC Address of each machine frame interface mac address as described MC-LAG。

9. device as claimed in claim 8, it is characterised in that described device also includes:

Communication module, for determine the interface mac address of described MC-LAG according to predetermined election regulation when described election module after, sends ARP message to each network segment, and described ARP message carries the interface mac address of the described MC-LAG determined according to predetermined election regulation。

10. the device as described in as arbitrary in claim 6 to 9, it is characterised in that described device also includes:

Processing module, for when described polymerization calculates unsuccessfully, then waiting that polymerization new for described MC-LAG calculates。