How to achieve redundant internet connection using two cisco 2610 routers?
Posted on 2003-03-14
Here it is:
Two sites with 2 T1s between them. Cisco 2610 with 2 Ethernet and 2 CSU/TSU on each side. IOS 12.0.
One of the Ethernet ports on each side is on the local subnet: 10.101.60.0 and 10.101.70.0.
Secondary Ethernet ports are not being used at the moment.
Each site has a NOKIA IP440 connected to a FATPIPE WARP and the WARPs, in turn, connected to ISPs.
Previously, we had both sites on the same subnet and were using transparent bridging. We also had only one T1 between sites.
The goal is to achieve aggregated bandwidth between sites and to have each site falling back on to the distant firewall for a default gateway (if local firewall is physically down). I am not trying to load balance internet access between sites.
Internal firewalls IPs are 10.101.60.1 and 10.101.70.1 correspondingly.
Clients (HOSTS) may have dual gateway entries.
I have some rudimentary knowledge of Cisco programming, so you going in details would be helpful.
The task seemingly easy to accomplish to begin with end-up being major pain. I have tried two routes
to 0.0.0.0 0.0.0.0 10.101.60.1 1
and 0.0.0.0 0.0.0.0 10.101.70.1 2
with RIP 2 enabled by default. The moment second router gets assigned a 0.0.0.0 0.0.0.0 x.x.x.x gateway- it nullifies the earlier propagated entries in routing table with local static route to a gateway on the same subnet. (The routes are still visible in sh running-config). Yanking the cable out of Ethernet port on local subnet does not affect the state of the routing table.
HELP!!! It is still an experimental environment I am working in right now so I am willing to try anything that may work.
Thanks in advance,