RIP Distribute-lists and the Extended ACL

Here’s a neat trick that’s an easy one to screw up or forget the syntax on.  In RIP (and EIGRP as well I believe) you can use an extended access-list to filter out specific routes advertised by specific neighbours.  This is done using the source and destination fields of the extended ACL to specify source of the routing update, and the route(s) you want to filter respectively.

Example after the jump.