Please see attached sketch showing existing IP Centrex solution.
I am trying to provide LAN (switch) redundancy in case of failure of 3750 Distribution switch.
I would bring an additional fiber run from Building A and Building B.
I would add another 3750(L2) Distribution switch. I would connect the 3750-Distribution-Switch2 to Router 2811 secondary fastethernet interface.
Someone mentioned that since the DHCP and call control is coming from Service Provider (HIPC), I can't just plug and use the Secondary interface on the 2811.
Such concern does not make sense to me.
Please let me know if in a typical HIPC scenario I can or cannot improve the Distribution Layer redundancy by adding another switch as I stated above.