Route-Filters

[cisco]

Hi,

I am aware that access-list and prefix-list comes under "Route-Filters", does route-map also comes under that category ?

regards

Neo

[Giuseppe Larosa]

Hello Neo,

route-maps can be used for route filtering or for PBR.

route-maps are the more powerful tool for route filtering allowing not only to filter but also to modify some fields/attributes of the routes.

Hope to help

Giuseppe

[cisco]

Hi,

So if in a question its mentioned that no route filtering technique has to be use for blocking certain routes, how do we achieve that ?

regards

Neo

[cisco]

Please help

regards

Neo

[Giuseppe Larosa]

Hello Neo,

>> So if in a question its mentioned that no route filtering technique has to be use for blocking certain routes, how do we achieve that ?

there can be multiple answers to this depending on the scenario and I would say on the type of exam

locally on node you have a virtual interface called null0:

whatever you route to null0 is silently discarded

ip route 10.220.222.0 255.255.255.0 null0

But even easier and better: if the routing protocol is EIGRP or OSPF you can tailor the network commands to advertise only the IP prefixes you need.

Hope to help

Giuseppe