Configure backup point to point link on VSS switches

[Wafabewafa]

I have two core switches in each office connecting both office one through point-to-point.

Now i have second point-to-point which i wan to use as backup.

see attach diagram, main point-to-point is configure in Vlan not as routed port..

What is best way to achieve it?

[Mark Malone]

If your certain you want no traffic to pass the backup link while primary is up and its all layer 2 links you can use STP cost and increase the cost of its link becoming less preferred than the primary , if its layer 3 depends on the protocol and the metrics available that you can use

[Wafabewafa]

Here is config for 100MB link.. second link would be standby10MB..

Switch 1

interface GigabitEthernet2/5/3
 description 100MB point-to-point
 switchport
 switchport access vlan 55
 switchport mode access

interface Vlan55
 description New Point To Point
 ip address 10.57.10.1 255.255.255.0
 ip flow ingress

Switch 2

interface GigabitEthernet2/5/3
description 100MB point-to-point
switchport
switchport access vlan 55
switchport mode access

interface Vlan55
description New Point To Point
ip address 10.57.10.2 255.255.255.0
ip flow ingress

I was thinking to  route the traffic as

100MB link ip route x.x.x.x x.x.x.x 10.57.10.1  20

10 MB link ip route x.x.x.x x.x.x.x 10.57.11.1 30

[Mark Malone · Accepted solution]

If both links are routed links then your config will work as its floating static so the AD of 20 will be more preferred as its lower  , i would use tracking and ip sla to enforce it as well so it is removed from the table straight away and replaced with the backup route