When I try to configure ISIS I get:
"protocol not in this image"
The IOS I use is 12.3(15)T9on a 26xx router. Normally it should support isis

I tried it out on a 17xx router with the asme IOS and it worked ...
I have the same problem with OSPF, BGP en EGP on some routers.
Anyone know that the problem could be? Can't find anything about it on the cisco site ... Some hardware/software requirements for ISIS and the other protocols
Greets

Miek