I would like to get some feedback to this design:
2821 - ISP1 (MLPPP NxT1)
2821 - ISP2 (T1)
1 ASA FW
BGP announcing ISP1's /24 block over both ISPs.
Thinking of running GLBP on 2821 routers thus giving the ASA a single default (redundant) route to Internet.
I am not necessarily interested in load balancing/sharing as the MLPPP provides plenty of BW.
Is this a typical design?
If I were to advertise a default route from BGP into OSPF/EIGRP to the ASA (ver 8.x), or even use two default routes (same ASA interface), will that accomplish the same level of redundancy without the additional GLBP design?
Also - assuming this design works, and load balancing is not an issue, is it worth it to receive full internet routes in BGP vs. default routes from ISPs? Both 2821s would run w/ 1GB of RAM.
Yes, on your routers GLBP/HSRP will use public IP addresses. If you want NAT/PAT on your ASA, then ASA will have a public IP address on the outside interface (from /24 block) with the gw on the "virtual IP". You will do NAT/PAT on ASA through this public IP address from the outside interface.