Solved: back to back vPCs with layer 3 port-channeling

west33637 · ‎11-15-2012

hello all. is it possible to run Layer 3 back to back VPCs btw 2 N 7009s (sup2 running f2 cards)? If so, do I put the same port-channel interface IP address on each VPC peer?

please see sample configuration below for one of the vpc domains. Thanks

vpc domain 2

peer-keepalive destination 10.10.10.2 source 10.10.10.1 vrf peer-keepalive

peer-switch

!

interface port-channel1

description vpc_peer-link

switch

switchport mode trunk

vpc peer-link

spanning-tree port type network

shut

!

interface e3/47-48,e4/47-48

description vpc_peer-link

switch

switchport mode trunk

channel-group 1 mode active

shut

!

interface port-channel50

description L3_TO_DISTRIBUTION

no switch

ip address 10.1.1.1/30 --- do I need this same IP to be configured on the other peer

vpc 50

!

interface e3/1,e4/1

description L3_TO_DISTRIBUTION

no switch

no ip add

channel-group 50 mode active

Chad Peterson · ‎11-16-2012

L3 port channels are not supported on vPCs. When connecting to a layer 3 host the best method is to use independent /30 links. Trying to do L3 over a vPC isn't providing any additional redundancy and load balancing can already be achieved over layer three links via ECMP.

Take a look at this presentation PDI gave at a recent DC Byte-Z session. We cover supported L3 topologies in vPC environments:

https://communities.cisco.com/docs/DOC-31528

Hope that helps

Chad

View solution in original post

Chad Peterson · ‎11-16-2012

L3 port channels are not supported on vPCs. When connecting to a layer 3 host the best method is to use independent /30 links. Trying to do L3 over a vPC isn't providing any additional redundancy and load balancing can already be achieved over layer three links via ECMP.

Take a look at this presentation PDI gave at a recent DC Byte-Z session. We cover supported L3 topologies in vPC environments:

https://communities.cisco.com/docs/DOC-31528

Hope that helps

Chad