Dual Links from 4431 to Nexus N9K vPC Domain - Config Help please

[Cormac Champion]

Hi all,

I'm looking configure a routed connection to connect dual links from a 4431 into a Nexus N9K Domain.

So on the 4431, I have

int g0/0/0 - 1

channel-group 1

int po1

ip address 192.168.0.1/30

However, on the N9K's, I can obviously do pretty much the same thing, but can I put the same IP Address on Po1 on each of the two switches in the vPC Domain ?

So each N9K would have the SAME

int eth1/1

channel-group 1 mode on

int po1

ip address 192.168.0.2/30

Or do I need to do it with Vlans and HSRP ?

[Cormac Champion · Accepted solution]

I sorted it out.  For others, you need to create Vlans with HSRP and assign the Vlan to your Port Channel

[Felipe A. Amaya]

Question, on the 9K's you said you created a VLAN, assuming 2000, you then created the SVI's with the HSRP configurations and the IP 192.168.0.2 /30 and then added the VLAN to the vPC right? Please explain a bit further as I have a similar set up coming up where I have 2 7000 Nexus running vPC and I was thinking on how to connect my 4451x router to both Nexus.

Thanks

[Cormac Champion]

So on the router, have something like the following

int g0/1

switchport access vlan xx

channel-group 1

int g0/2

switchport access vlan xx

channel-group 1

int po1

ip address xx.xx.xx.xx /29 

On EACH nexus

int eth1/1

switchport access vlan xx

channel-group 1 mode on

int vlan xx

ip address xx.xx.xx.xx /29

hsrp xx

preempt

priority 110

ip xx.xx.xx.xx

int po1

vpc x

So you are essentially doing a /30 link from the router to the N7K but you'll need to use a /29 due to the 4 addresses required.

Hope that helps