cisco ios // setup lacp on catalyst switches

warning // lessons learned

ESW doesn’t offer LACP. we’ve tried to make static etherchannel work with several bonding modes without success (there’s always about 50% packet loss). this is probably because the static etherchannel (mode on) is indeed a PAgP one which operates its own way.

both LACP peers can be active - that’s fine enough

we’re going LACPDU slow rate here (the default on both sides)

lacp setup

we want two times 3-port aggregates for linking two GNU/Linux servers together

int range gi0/9 - 11
    channel-protocol lacp
    channel-group 1 mode active

int range gi0/25 - 27
    channel-protocol lacp
    channel-group 2 mode active

choose the vlan on which this is all going to work

int range po1 - 2
    switchport mode access
    switchport access vlan 400

check

show interfaces status
show etherchannel 1 summary
show etherchannel 2 summary

more details on LACPDU rate

show lacp internal

more commands

show interfaces gi 0/9 etherchannel
show interfaces gi 0/25 etherchannel
show etherchannel 1 detail
show etherchannel 2 detail
show etherchannel load-balance
show etherchannel 1 port-channel
show etherchannel 2 port-channel

ready to go

you’re good to proceed on the server side

resources

cisco ios // setup lacp on catalyst switches

warning // lessons learned

lacp setup

ready to go

resources

the book

deep dive

links

lacp rate