VSS L3 Subinterfaces

[zekebashi]

Hello,

Can you configure a sub-interfaces with IP addresses under a L3 port-channel in VSS (a pair of C6509s)?

Thanks,

~zK

[balaji.bandi]

If your question on the VSL Link - NO

Normal Port-channel yes you can do.

[zekebashi]

Thanks for the quick response.

I was wondering if you had a document to show how to configure that? Or can you provide an example?

Also, I am assuming that I won't have to use an additional L3 interlink between the two chassis, is that correct?

Thanks, ~zK

[balaji.bandi]

Not sure what is the requirement here.

VSS Physically 2- but logically 1 - why do you like to connect Port-channel between chasis ?

I meant was you can do port-channel with other device with sub-interfaces.

you can do between port as layer 3 - how we do traditional way, but not sure - is this your rquirement or goal to achieve this.

[zekebashi]

We are adapting SD-WAN in our environment and the requirement is to connect the VSS to an upstream device (WAN Edger Router). 

The vendor required to connect their device to the VSS using L3 Ether-channel. When I reviewed Cisco's document I posted above, it states that "sub-interfaces can't be created on L3 Ether-Channel".

You mentioned that sub-interfaces can be created on a L3 Ether-channel and that would meet the requirement. I was wondering if there was a document to explain the steps to configure the L3 sub-interfaces.

I don't intend or plan to use L3 between the VSS pair. you can disregard this point.

~zK

[balaji.bandi · Accepted solution]

example : (on the router side, On switch side you can do Ether-channel and VLAN configuration)

interface Port-channel10
no ip address
negotiation auto
!
interface Port-channel10.10
encapsulation dot1Q 10
ip address 10.10.10.1 255.255.255.0
!
interface GigabitEthernet1/0/1
no ip address
negotiation auto
channel-group 10 active
!
interface GigabitEthernet2/0/1
no ip address
negotiation auto
channel-group 10 active