View - ADTRAN Support Community

Additional BGP Configuration
Specifies a privately defined community for routes serviced by this route map. This is a
numeric value that can be an integer from 1 to 4294967295 or string in the form aa:nn, where aa is the
AS number and nn is the community number. Multiple community number parameters can be present
in the command.
add Appends the listed community number to the end of the community attribute for routes serviced
by this route map.
internet Sets the community attribute to the reserved INTERNET community number for routes
serviced by this route map.
local-as Sets the community attribute to the reserved NO_EXPORT_SUBCONFED community
number for routes serviced by this route map. Routes containing this attribute should not be advertised
to eBGP peers.
no-advertise Sets the community attribute to the reserved NO_ADVERTISE community number for
routes serviced by this route map. Routes containing this attribute should not be advertised to any BGP
peer.
no-export Sets the community attribute to the reserved NO_EXPORT community number for routes
serviced by this route map. Routes containing this attribute should not be advertised to BGP peers
outside a confederation boundary.
none Removes all communities from BGP routes serviced by this route map.
See Table 1 on page 14 for a summary of the well-known communities (for example,
INTERNET, NO_EXPORT_SUBCONFED, etc.) and the policy expected for these
communities.
Attributes, such as local preference and metric, can also be defined for the community string. A
discussion of the set commands used to define these community attributes begin with Prepending
Private AS Numbers for Load Balancing on page 28.
Enabling an AOS Device to Send or Receive BGP Communities
A BGP neighbor must be configured for BGP communities before it is able to send or receive a
community attribute. Use the send-community standard command to enable this peer to accept a
community attribute and add the community attribute to any advertisement sent by this peer. This
command is issued from the BGP Neighbor Configuration mode:
(config-bgp-neighbor)#send-community standard
Deleting Communities from a Route
BGP communities are not completely standardized. External neighbors can place routes in a
community for which the local network does not define a policy or for which it defines a substantially
different policy. A network administrator might not want to apply the policies that the external
neighbor is requesting with the community attribute. As a result, the administrator might need to
remove certain communities from inbound routes in order to enforce the organization’s policies.
61200860L1-29.4E Copyright © 2012 ADTRAN, Inc. 15