Looking for suggestions on routing for a school system...
The main site currently has one T1 to the Internet and will be getting a second, probably from a different provider (for redundancy and extra bandwidth, both). Behind the 2800 series router is a PIX with three interfaces (inside, outside, DMZ).
The second site has its own T1 to the Internet with a 1600 series router behind which is another PIX (inside and outside). Connected to the internal network of both sites is another T1 for communications between the two sites (IP telephony and data).
Design goals, in order of importance:
1. Use the two Internet T1s at site #1 to maximize available bandwidth and redundancy. We will have to deal with the asymmetric routing as the two links will likely use different ISPs.
2. If either site #1 or site #2 loose their direct Internet connectivity, try to use (at most half of) the link between campuses for limited Internet connectivity.
3. If the T1 between the two sites goes down, bring up a VPN across the Internet to restore connectivity.
