We have a topology like this:
R1, R2 are our edge routers (4506)
X1, X2 are let's call it ISP routers
I is router to go into outside of the network
(some extra words about the connections:
The R1 is connected to the X1 and R2
The R2 is connected to the X2 and R1
The X1 is connected to the R1 and I
The X2 is connected to the R2 and I
The I is connected to the X1/X2)
For now, we are not using R2, all the traffic is going thru the R1, it is working fine.
We are using BGP to exchange routes with our ISP (between routers R1 and X1), R2 and X2 are nowadays backup routers.
In lab I tested the HSRP between R1 and R2, and it was working fine. But then, question about the load balancing came.
Well, the GLBP can be done between R1 and R2 and load balancing for the outgoing traffic will be achieved.
But what about the incoming traffic? In case of no changes at the X1 and X2 level, all the traffic will come back to the our internal network (behind R1/R2) using only the link R1-X1 (because of BGP, more weight had this link).
I'm pretty sure that we need to do something on the ISP X1/X2 routers, let's say it is possible, but not huge steps like to resign from BGP. ;)
All ideas are warmly welcome, thank you.