Command:

ip community-list


Mode:

Router(config)#


Syntax:

ip community-list community-list-number {permit | deny} community-number no ip community-list community-list-number

 

Syntax Description:

community-list-number Integer from 1 to 99 that identifies one or more permit or deny groups of communities.
permit Permits access for a matching condition.
deny Denies access for a matching condition.
community-number Community number configured by a set community command. Valid value is one of the following:

A number from 1 to 4294967200. You can specify a single number or multiple numbers separated by a space.
internet--The Internet community.
no-export--Routes with this community are sent to peers in other subautonomous systems within a confederation. Do not advertise this route to an eBGP peer. External systems are those outside the confederation. If there is no confederation, an external system is any eBGP peer.
local-as--Do not advertise this route to peers outside the local autonomous system. This route will not be advertised to other autonomous systems or sub-autonomous systems when confederations are configured.
no-advertise--Do not advertise this route to any peer (internal or external).

 

Command Description:

To create a community list for BGP and control access to it, use the ip community-list command in global configuration mode. To delete the community list, use the no form of this command.

Once you permit a value for the community number, the community list defaults to an implicit deny for everything else that has not been permitted.


Example:

In the following example, Cisco IOS software permits all routes except the routes with the communities 5 and 10 or 10 and 15:

Router(config)#ip community-list 1 deny 5 10
Router(config)#ip community-list 1 deny 10 15
Router(config)#ip community-list 1 permit internet

The following example permits all routes within the local autonomous system:

Router(config)#ip community-list 1 permit local-as


Misconceptions:

None


Related Commands:

set community

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