hi everyone,
I just ran into this with my customer. I think I understand why they are doing it, but Bridging is a pretty new concept for me so if can you correct me if you see that I'm heading the wrong way.
Below is a working config, has been working for a long while, and I'm just trying to understand it.
So the customer has Router R1, and two CAT4503 (CORE1 and CORE2) configure with HSRP.
From R1, they have 2 interfaces, Fa0/0 and Fa0/1 connect to 2 interfaces on each CAT4503.
R1 (Fa0/1)_______________ (G1/1) CORE1
|(Fa0/0)_________________ (G1/1) CORE2
R1 is the Internet Edge Router.
R1 has Bridging configured for Fa0/1 and Fa0/0 under Bridge Group 1, there is an Interface BVI1 with IP 10.10.254.1/24, and the config of bridge 1 is "bridge 1 route ip"
CORE1 and CORE2 both have G1/1 configure just with ACCESS VLAN 10, and ip route 0.0.0.0 0.0.0.0 10.10.254.1
My guess is that the Router was configure this way to give a Redundancy for the connection between the Switch and the Router. Since there is no Interface VLAN, this is the only way out to Redundant and have a Routing Interface on the Router using BVI.
We are replacing the pair of 4503 with a stack of 3750. My question is: should I configure LACP for the 2 ports on the 3750-Stack? or should I just leave them as independent port just like the 4503?
I'm thinking since LACP or any etherchannel need to be done on both ends, I would have to leave the ports independent instead of tieing them into a Port-Channel.
If you have run into this or have better understanding about Bridging, your input will be much appreciated.
Thank you everyone!