Juniper JUNOSE, Configuration Manual

Page: 130 / 738

The following commands configure router Boston to apply route map 5 to routes
going out to 10.5.5.4. If the destination IP address of such a route matches instance
10 of the route map, router Boston sets the community attribute of the route to
no-export.
host3(config)# router bgp 122
host3(config-router)# network 192.168.144.0 mask 255.255.240.0
host3(config-router)# neighbor 10.5.5.4 remote-as 425
host3(config-router)# neighbor 10.5.5.4 send-community
host3(config-router)# neighbor 10.5.5.4 route-map 5 out
host3(config-router)# exit
host3(config)# route-map 5 permit 10
host3(config-route-map)# match ip address access5
host3(config-route-map)# set community no-export
host3(config-route-map)# exit
host3(config)# access-list access5 permit 10.16.22.112
Suppose router Boston forwards a route destined for 10.16.22.112 through router
LA. Route map 5 matches and sets the community attribute to no-export. As a
consequence router LA does not export the route to router NY; the route does not
reach its destination.
ip bgp-community new-format
Use to specify that communities must be displayed in AA : NN format, where AA
is a number that identifies the autonomous system and NN is a number that
identifies the community within the autonomous system.
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Use the no version to restore the default display.
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See ip bgp-community new-format.
neighbor send-community
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Use to specify that a community attribute must be sent to a BGP neighbor.
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You can specify that only standard communities, only extended communities,
or both be sent.
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When you create a neighbor in a VPNv4 address family, that neighbor
automatically gets a
neighbor send-community extended command; this
command subsequently appears in a show configuration display because it is
not the default.
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If you specify a BGP peer group by using the peerGroupName argument, all the
members of the peer group inherit the characteristic configured with this
command. You cannot override this inheritance for a peer group member.
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Example
host1(config-router)# neighbor send-community westcoast extended
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New policy values are applied to all routes that are sent (outbound policy) or
received (inbound policy) after you issue the command.
To apply the new policy to routes that are already present in the BGP routing
table, you must use the
clear ip bgp command to perform a soft clear or hard
clear of the current BGP session.
94 ■
Configuring BGP Routing Policy
JUNOSe 11.0.x BGP and MPLS Configuration Guide