L3 Port-channel from spine to IPN device

[Antonio Macia]

Hi,

Is it possible to create a L3 port-channel from each spine to each IPN device?

In my case, two 6509 in VSS are the IPN devices and I was thinking to have a layer 3 port-channel from each spine where each link ends in a different VSS member.  In this way, if one of the VSS members fails, it won't be OSPF recalculations or PIM Bidir changes. 

If that's not possible and only single links can be used, is it recommended to have two links per spine ending in a different VSS member or just one link per spine connected to a single VSS member?

Thanks.

[Gaurav Gambhir]

L3 port-channels are not supported on spines, you can configure them as individual routed sub-interfaces with vlan-4 tagging.

[Antonio Macia]

Thank you Gaurav.

In this case, having two links per spine to the IPN device is the recommended right? At least based on the pictures in the multipod whitepaper. 

The multipod configuration whitepaper uses just a single link per spine. Would adding additional links incur on any PIM Bidir caveat?

Regards.

[Gaurav Gambhir · Accepted solution]

Multiple uplinks on each spine to IPN is recommended for redundancy, that should not create any issues with PIM, you need to make sure that everyone links b/w IPN devices have lower OSPF Cost IPN devices do not pick spine devices as preferred path to reach RP.