High Availability box to box for cisco 4000 series

[Augustgood]

Hi ,

how can be configured high availability on a couple of cisco 4351 or 4451 serie router ?

someone can help me, send a config link

[Joseph W. Doherty]

Generally, for ISRs, high availability is obtained by having more than one with (ideally) an independent path to your destination. If your ISRs are the also the first hop (i.e. gateway), you can use a FHRP (e.g. HSRP). If they are a transit router, you would have routes that "know" a destination can be reached via either.

[Augustgood]

local HA, we can use interchassis ha ?

[Joseph W. Doherty]

Yes. Without it, the best you might accomplish is using two different modules for links (hoping if one fails the other will not) and/or dual power supplies (if offered). The "box" itself, and the "CPU" are single points of failure.