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Dell Configuration Guide for the S4048–ON System 9.14.2.5

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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.
    CONFIG-ROUTER-BGP mode
    neighbor {ip-address | ipv6-address | peer-group-name} route-map map-name {in | out}

Example configuration for filtering routes with community lists

DellEMC# configure terminal
DellEMC(conf)# router bgp 400
DellEMC(conf-router_bgp)# neighbor 10.10.10.1 remote-as 500
DellEMC(conf-router_bgp)# neighbor 10.10.10.1 route-map route2 in
DellEMC(conf-router_bgp)# exit
DellEMC(conf)# route-map route2 permit 10
DellEMC(conf-route-map)# match community 1
DellEMC(conf-route-map)# set community 99
DellEMC(conf-route-map)# exit
DellEMC(conf)# ip community-list 1 permit 100
DellEMC(conf)# exit
DellEMC#

In the above example, add a BGP neighbor to the AS 400 and the route-map called route2 applied to inbound routes from the BGP neighbor at 10.10.10.1. A route map route2 is created with a permit clause and the route’s community attribute is matched to communities in community list 1. A community list 1 that permits routes with a communities attribute of 100.

To view the BGP configuration, use the show config command in CONFIGURATION ROUTER BGP mode. To view a route map configuration, use the show route-map command in EXEC Privilege mode.

To view which BGP routes meet an IP community or IP extended community list’s criteria, use the show ip bgp {community-list | extcommunity-list} command in EXEC Privilege mode.

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