Classless domain ---------R1----------classful domain R1 is the border router between the classless and classful routing domain. R1 maintains a BGP peering session with the classless routing domain, and runs a classful IGP with the classful routing domain. The classless routing domain is originating a default route to R1 via BGP, and advertising prefixes which are subnetted, aggregated, and classful. Since the classful routing domain does not support the advertisement of subnets or aggregates, there is no reason for R1 to accept any of these prefixes in from the classless domain. Configure an access-list or prefix-list on R1 that will only allow classful networks and a default route in from the classless routing domain. This access-list or prefix-list should not contain more than four entries.
I think this will work but not sure. Can anyone tell me if this is right? ip prefix-list test seq 5 permit 0.0.0.0/0 ip prefix-list test seq 5 permit 0.0.0.0/0 ge 8 le 8 ip prefix-list test seq 5 permit 0.0.0.0/0 ge 16 le 16 ip prefix-list test seq 5 permit 0.0.0.0/0 ge 24 le 24 Any help is duly appreciated in advance. Thanks Raj Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=72090&t=72090 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
