Manipulating The Community Attribute - Dell S4820T Configuration Manual

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

Manipulating the COMMUNITY Attribute

In addition to permitting or denying routes based on the values of the COMMUNITY attributes, you can
manipulate the COMMUNITY attribute value and send the COMMUNITY attribute with the route
information.
By default, Dell Networking OS does not send the COMMUNITY attribute.
To send the COMMUNITY attribute to BGP neighbors, use the following command.
• Enable the software to send the router's COMMUNITY attribute to the BGP neighbor or peer group
specified.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} send-community
To view the BGP configuration, use the show config command in CONFIGURATION ROUTER BGP
mode.
If you want to remove or add a specific COMMUNITY number from a BGP path, you must create a route
map with one or both of the following statements in the route map. Then apply that route map to a BGP
neighbor or peer group.
1. Enter ROUTE-MAP mode and assign a name to a route map.
CONFIGURATION mode
route-map map-name [permit | deny] [sequence-number]
2. Configure a set filter to delete all COMMUNITY numbers in the IP community list.
CONFIG-ROUTE-MAP mode
set comm-list community-list-name delete
OR
set community {community-number | local-as | no-advertise | no-export |
none}
Configure a community list by denying or permitting specific community numbers or types of
community.
• community-number: use AA:NN format where AA is the AS number (2 or 4 Bytes) and NN is a
value specific to that autonomous system.
• local-AS: routes with the COMMUNITY attribute of NO_EXPORT_SUBCONFED and are not sent
to EBGP peers.
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Border Gateway Protocol IPv4 (BGPv4)