ip sla tracking issue

[Mohd Nasir]

I have 2 router A and router  B. There are  3 switches X,Y,Z which is connected in ring topology via trunk port with each other.

Switch X connected to Router A and switch Z connected with router B. and switch Y connected to switch X,Z.

I want if router B outgoing interface goes down then switch X,Y,Z start forward traffic towards the Router A. 

[M02@rt37]

Hello @Mohd Nasir,

You could implement HA and redundancy mechanisms in your topology. 

Initially, Router B should be the active router for the virtual IP address, and traffic flows through it.

If Router B's outgoing interface goes down (monitored by tracking), Router B's HSRP/VRRP priority decreases, and Router A becomes the active router.

Switches X, Y, and Z still have two paths available to reach both routers. However, the HSRP/VRRP change ensures that traffic flows through Router A.

Configure HA:

Set up HSRP or VRRP on Router A and Router B for the LAN segment connected to switches X, Y, and Z.

Assign a virtual IP address as the default gateway for the devices in switches X, Y, and Z. This virtual IP address should be shared between Router A and Router B.

Configure Router B Interface Tracking:

On Router B, configure interface tracking. This means that Router B will monitor the status of its outgoing interface. When the interface goes down, Router B will decrement the HSRP/VRRP priority.

When Router B's priority becomes lower than Router A's priority, Router A will become the active router for the virtual IP address.