I recently took over this Network, and would like to understand a few things that I am not sure about.
I am used to run HSRP on the LAN interfaces of a WAN router and track the serial interface so the router can failover if the circuit goes down.
In this particular setup, they are using a pair of 3845’s, each is connected to MPLS circuit, running eBGP with the provider, and iBGP with each other. The 3845 has all the Layer-3 interfaces for the VLAN’s, and this is where the HSRP is configured for each VLAN. The LAN interfaces on the router are not used, only the HWIC ports are used as trunks to the Layer-2 switches connected to them. Since this router has dual functions (WAN and LAN L-3), do I need to configure tracking for the serial interface? If so, would that need to be done for each SVI?