In this article we will make a link aggregation protocol with two ports in one bundle. You can use more port up to 8 ports in Cisco devices.
We will use the G1/0/0 and the G2/0/0 ports to configure link aggregation. The basic configuration steps are below.,
On RouterA
RouterA> enable RouterA# configure terminal RouterA (config)# interface port-channel 1 RouterA (config-if)# lacp max-bundle 2 RouterA (config-if)# ip address 192.168.0.1 255.255.255.0 RouterA (config-if)# interface g1/0/0 RouterA (config-if)# no ip address RouterA (config-if)# channel-group 1 mode active RouterA (config-if)# exit RouterA (config)# interface g2/0/0 RouterA (config-if)# no ip address RouterA (config-if)# channel-group 1 mode active RouterA (config-if)# end
On RouterB
RouterB > enable RouterB # configure terminal RouterB (config)# interface port-channel 1 RouterB (config-if)# lacp max-bundle 2 RouterB (config-if)# ip address 192.168.0.2 255.255.255.0 RouterB (config-if)# interface g1/0/0 RouterB (config-if)# no ip address RouterB (config-if)# channel-group 1 mode passive RouterB (config-if)# exit RouterB (config)# interface g2/0/0 RouterB (config-if)# no ip address RouterB (config-if)# channel-group 1 mode passive RouterB (config-if)# end
Beside the basic steps, we can also configure some parameters used with LACP. Here we do it for only routerA, you can also use this command on the other end.
RouterA # configure terminal RouterA (config)# lacp system-priority 11111 RouterA (config)# interface g1/0/0 RouterA (config-if)# lacp port-priority 100 RouterA (config-if)# exit RouterA (config)# interface g2/0/0 RouterA (config-if)# lacp port-priority 200 RouterA (config-if)# end
To remove aport channel from a port you can use the below configurtion:
RouterA > enable RouterA # configure terminal RouterA (config)# no interface port-channel 1 RouterA (config)# end
To view the agregated link’s information, use the ”show interfaces port-channel 1” command.
I hope these two article will be helpfull for you to understand how to configure link aggregation on Cisco routers. In the following articles, we will focus link aggregation on Juniper and Alcatel-Lucent devices. Keep on.
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)
