Lab
9.2.3 Identifying and Filtering Routes based on the NLRI
Objective:
Filter routing information using a
distribute list in BGP.
Scenario:
Given the lab you just completed on
Router Reflectors. You have decided that you want to prevent network
2.0.0.0 from being advertised to AS 200. You have decided to use
a route filter on Router C.
Lab Tasks:
Examine the routing table on
Router D in AS 200. Do you see a BGP advertisement for network
2.0.0.0?
If you do not see an advertisement
for network 2.0.0.0, troubleshoot the network until you see the
route in the BGP table.
Log into router C. This is where
we are going to filter the routing updates that go into AS 200.
We are going to use a distribute list in order to accomplish
this task.
The first step in configuring a
distribute list is to set up a standard access list. Since we
are going to filter network 2.0.0.0 and allow all other
networks, issue the following commands: