System information

BSR 64000 Configuration and Management Guide
12-64
• no-export
• no-advertise
• no-sub-confed export
In addition, you can define a community number to advertise to a specific community
number. All destinations belong to the general Internet community by default.
Use the no export keyword to disallow advertising to EBGP peers. This is useful in a
network that uses IBGP heavily but does not want to share its internal routing entries
with its EBGP peers. Use the no-advertise keyword to prevent routes from being
propagated beyond the local router, even to IBGP peers.
Figure 12-21 details creating a route map based on the network in which Router
Boston sets the value of the local preference attribute based on the value of the
community attribute. Any route that has a community attribute of 100 matches
community list 1 and has its local preference set to 50. Any route that has a
community attribute of 200 matches community list 2 and has its local preference set
to 25. All other routes do not have their local preference attributes changed, because
all routes are members of the internet community.
1. To create a community list that globally accepts or rejects all advertisements, use
the ip community-list command in Global Configuration mode, as shown below:
MOT(config)#ip community-list <community-list-number> {permit | deny}
<community-numbers>
where:
community-list-number is a number that identifies a community list.
permit indicates accept the advertisements.
deny indicates reject the advertisements.
community-numbers are one or more community numbers.
2. To create a community list that accepts or rejects advertisements with a local AS
community, use the ip community-list local-as command in Global
Configuration mode as shown below:
MOT(config)#ip community-list <community-list-number> {permit | deny}
local-as
where: