Filtering Routes With Community Lists - Dell S4820T Configuration Manual

To view the configuration, use the show config command in CONFIGURATION COMMUNITY-LIST or
CONFIGURATION EXTCOMMUNITY LIST mode or the show ip {community-lists |
extcommunity-list} command in EXEC Privilege mode.
Dell#show ip community-lists
ip community-list standard 1
deny 701:20
deny 702:20
deny 703:20
deny 704:20
deny 705:20
deny 14551:20
deny 701:112
deny 702:112
deny 703:112
deny 704:112
deny 705:112
deny 14551:112
deny 701:667
deny 702:667
deny 703:667
deny 704:666
deny 705:666
deny 14551:666
Dell#

Filtering Routes with Community Lists

To use an IP community list or IP extended community list to filter routes, you must apply a match
community filter to a route map and then apply that route map to a BGP neighbor or peer group.
1. Enter the ROUTE-MAP mode and assign a name to a route map.
CONFIGURATION mode
route-map map-name [permit | deny] [sequence-number]
2. Configure a match filter for all routes meeting the criteria in the IP community or IP extended
community list.
CONFIG-ROUTE-MAP mode
match {community community-list-name [exact] | extcommunity extcommunity-
list-name [exact]}
3. Return to CONFIGURATION mode.
CONFIG-ROUTE-MAP mode
exit
4. Enter ROUTER BGP mode.
CONFIGURATION mode
router bgp as-number
AS-number: 0 to 65535 (2-Byte) or 1 to 4294967295 (4-Byte) or 0.1 to 65535.65535 (Dotted format)
5. Apply the route map to the neighbor or peer group's incoming or outgoing routes.
Border Gateway Protocol IPv4 (BGPv4)
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