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)
