What is the max number of secondary interfaces on routers & switches?

[state]

What is the maximun number of secondary interfaces on routers & switches? What are the problems with having more than one?

[jamey]

From what I know, there is no hard limit on the number of secondary addresses on an interface other than RAM used and NVRAM space for the router's config.

[state]

Are there any known issues when using multiple secondary interfaces such as: load balancing, routing inconsistancies, etc.?

[jamey]

I'm not aware of any issues that don't have workarounds when using secondary addresses. That is not to say there aren't any. I suggest looking on on Cisco and comp.dcom.sys.cisco for any references on specific concerns you have about a particular technology or IOS feature and its compatibility with secondary addresses.

HTH