Need direction on router config

[wdoellefeld]

Have a 2610 with 3 interfaces, had 2 active before and I am turning up another. This router is an external, I have a 2501 on the internal side.

ethernet0 = LAN
ethernet1 = Wireless ISP (just added)
serial0 = T1

My question is with routing but I'd also like to implement some fail-over as well.

I have "ip route 0.0.0.0 0.0.0.0 serial1" in place and I know I have to add the route for ethernet1 as well. I've heard that having two routes like this can cause packet loss as well as slowdown because of caching. Is this true and how can I prevent this?

On the fail-over side I have no clue how to implement. Any ideas would be appreciated.

Thanks!

 

[lui3]

For failover you can use the same command except add adminsistrative distance higher than static something like this

ip route 0.0.0.0 0.0.0.0 ether1 225


This will cause all packets destined for T1 to be routed to next adminstrative distance of 225 in the event T1 fails.

Since the admin distance is higher than the normal 0.0.0.0 command the packets will never be routed to ether1 unless the T1 is down. However load balancing is not possible with this configuration. Routing protocols like OSPF or EIGRP would be required for this configuration.