LINK AGGREGATION – PART 4 (LAG CONFIGURATION ON ALCATEL-LUCENT DEVICES)

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LAG Configuration on Alcatel-Lucent Devices

In the previous article we focus on how to configure link aggregation on Cisco and Juniper devices. Here we will see how is this configuration done on Alcatel-Lucent devices. Alcatel-Lucent 7750 Service Router will be our device.

The term for Link Aggreagtion is LAG(Link Aggragation Group) in Alcatel-Lucnet.In Alcatel-Lucent routers also maximum 8 ports can be bundled in a LAG, and up to 64 LAG can be on a chassis.

The ports in a LAG must have the same characteristis, speed, duplex etc.

In this part, let’s start with the configuration of the ports. We have ports 1/1/1 and 1/1/2. We must ensure that these two ports have identical speed and duplex. Let’s starts with RouterA.

A : RouterA # configure port 1/1/1 
A : RouterA >config>port# ethernet no autonegotiate
A : RouterA >config>port# ethernet speed 100
A : RouterA >config>port# ethernet duplex full
A : RouterA >config>port# exit
A : RouterA # configure port 1/1/2 
A : RouterA >config>port# ethernet no autonegotiate 
A : RouterA >config>port# ethernet speed 100
A : RouterA >config>port# ethernet duplex full

Above, the “no autonegotiation” command is used to ensure that autonegotiation is disabled and only a specific speed is advertised.

We must remove the port binding from the interface between RouterA and RouterB. To do this use the below command.

A : RouterA # configure  router  interface RouterAB  no  port

Next, we configure the LAG and associate the ports with this LAG.

A : RouterA # configure lag 20
A : RouterA >config>lag# port 1/1/1
A : RouterA >config>lag# port 1/1/2
A : RouterA >config>lag# exit

And lastly, we can bind the LAG to the interface between RouterA and RouterB.

A : RouterA #  configure  router  interface  RouterAB  
A : RouterA >config>if# lag  20

We will do the same configuration on the other end of the LAG.

B : RouterB # configure lag 20
B : RouterB >config>lag# port 1/1/1
B : RouterB >config>lag# port 1/1/2
B : RouterB >config>lag# exit

And lastly, we can bind the LAG to the interface between RouterA and RouterB.

B : RouterB #  configure  router  interface  RouterBA  
B : RouterB >config>if# lag  20

After the configuration of LAG, you can check the Lag with the below comands:

A : RouterA # show lag
A : RouterA # show lag  20
A : RouterA # show lag  20  detail
A : RouterA # show lag  20  statistics

Below, the screenshot of these commands on Alcatel-Lucent Service Router are also given.

“Show lag” Command on ALU SR 7750

“Show lag 20” Command on ALU SR 7750

“Show lag 20 detail” Command on ALU SR 7750

I hope this article series, that show the configuration of the Link Aggregation, will be helpfull for you.Keep on ipcisco.com.

Link Aggregation – Part 1 (Link Aggregation Control Protocol, LACP)
Link Aggregation – Part 2 (LACP Configuration on Cisco Devices)
Link Aggregation – Part 3 (LACP Configuration on Juniper Devices)
Link Aggregation – Part 4 (LAG Configuration on Alcatel-Lucent Devices)