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NetStructure™ 480T Routing Switch User Guide
These points apply to this example:
• RTA is a member of AS 1111 and peers with a router in the
Internet to receive the entire Internet routing table.
• RTB is a member of AS 2222, and has an EBGP connection with
RTA through which it receives the Internet routing table.
• AS 1111 is acting as a transit AS for all traffic between AS 2222
and the Internet.
If you are the administrator of AS 1111 and you want to filter
out route information about network 221.1.1.0/24 and its
subnets from being passed on to AS 2222, you can configure a
route-map on the egress side of RTA's EBGP connection with
RTB, and filter out the routes.
To configure RTA, use these commands:
create access-profile iplist type ipaddress
configure iplist add ipaddress 221.1.1.0/24
create route-map bgp-out
configure bgp-out add 10 deny
configure bgp-out 10 add match nlri-list iplist
configure bgp-out add 20 permit
configure bgp neighbor 10.0.0.2 route-map-filter
out bgp-out
configure bgp neighbor 10.0.0.2 soft-reset out
To modify the routing information originated from AS 300 to
include a MED value of 200, the sequence of commands would be:
create access-profile aslist type as-path
configure aslist add as-path "^300"
configure bgp-out add 15 permit
configure bgp-out 15 add match as-path access-
profile aslist
configure bgp-out 15 add set med 200
configure bgp neighbor 10.0.0.2 soft-reset out
Changes to Route Maps
Changes to the route maps used to modify or filter NLRI
information exchanged with neighbors is immediately effective on
the routing information exchanged after the policy changes.