vPC Cisco Nexus and Transit VLAN
I have two Nexus switches configured in a vPC domain.
Each switch will receive a dedicated fiber link to the headquarters for communication. My plan is to bundle these two fibers into a port-channel and configure a vPC, since at the headquarters there is only one switch and I can close this port-channel. I intend to configure the port-channel as an access port, allowing only VLAN 112. Then, I would set up the SVI and HSRP between the Nexus switches for this VLAN.
My concern is that if one fiber link fails, traffic might still reach the Nexus with the broken link. To address this, I thought about creating a floating route between the Nexus switches using VLAN 112, but with a higher administrative distance.
Another option would be to create a dedicated VLAN (e.g., VLAN 113) just for transit between the Nexus switches, and use it to configure floating routes to reach the headquarters in case one of the fibers goes down.
I also consider configuring the port-channel as an L3 interface, using a single transit VLAN between the Nexus switches and creating the floating route through it.
My question is: is the approach I described above considered best practice, or should I go with the alternative of creating a dedicated transit VLAN?