We are in the process of setting up eBGP and iBGP between our datacenter and Verizon internet services. We will have 4x T1s (2x 3.0mbit) two connected to VZ in Dallas and two connected to VZ in KC. This gives us diverse paths to the internet so if VZ has an issue we aren't dead in the water (has happened before). VZ is handling everything on their side and will setup our IP block to be available from either side but we want to load share and need complete failover. What we plan to do is split our IP block in half xxx.xxx.xxx.1-126 going to Dallas and xxx.xxx.xxx.128-254 going to KC.
I've reviewed this page: http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml and it looks exactly like what we want to do except it doesn't go beyond our routers to what our firewall portion should look like. That is where I need some help. We currently have two Pix 515e firewalls running in a Active/Standby failover pair (running 7.2) that have to NAT traffic from outside IPs to internal hosts. Right now it is configured with a simple 0.0.0.0/0.0.0.0 default gateway that points to one of our two 2821 routers but that will all change with the new BGP stuff. How can I do this? All help is greatly apprecaited.
If I understand what you're saying then that wouldn't matter because even if it is pointing all the traffic to R1, R1 and R2 have iBGP load sharing that will send the traffic where it needs to go regardless of which router it came to originally?
Yes, that?s correct.
As you mention previously that you are reviewing the below document (which will take care of load sharing)
Load Sharing When Dual-Homed to One ISP through Multiple Local Routers