--- Austin <amckinle@andrew.cmu.edu> wrote:
It's worth noting that C's don't need actual IP address space assigned to the router-id for OSPF. It's just an arbitrary value; it's probably better karma to set it to whatever you want (maybe something that doesn't look like an IP address).
RFC 2328:
Router ID A 32-bit number assigned to each router running the OSPF protocol. This number uniquely identifies the router within an Autonomous System.
eek! There are a couple of downsides to having the router-ID divorced from a physical address: 1) you get an additional number which you have to have to track to ensure uniqueness. 2) you lose the benefit of being able to double check reachability (ping/ssh to router ID) 3) RFC 1403 says that the BGP router identifier must be the same as the OSPF router ID, and do you really want your BGP to reflect an unreachable ID? I've had a customer who used unreachable router IDs, and it made their NOC work quite a bit harder than they otherwise would have had to... -David __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com