â– Use to assign an AS-path access list to matching inbound or outbound routes
with the in or out keywords.
â– You can specify an optional weight value with the weight keyword to assign a
relative importance to incoming routes matching the AS-path access list.
â– The name of the access list is a string of up to 32 characters.
â– 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 unless it is overridden for a specific peer. However, you cannot
configure a member of a peer group to override the inherited peer group
characteristic for outbound policy.
â– 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.
Behavior is different for outbound policies configured for peer groups for which
you have enabled Adj-RIBs-Out. If you change the outbound policy for such a
peer group and want to fill the Adj-RIBs-Out table for that peer group with the
results of the new policy, you must use the clear ip bgp peer-group command
to perform a hard clear or outbound soft clear of the peer group. You cannot
merely perform a hard clear or outbound soft clear for individual peer group
members because that causes BGP to resend only the contents of the Adj-RIBs-Out
table.
â– Use the no version to disassociate the access list from a neighbor.
â– See neighbor filter-list.
Filtering AS Paths with a Route Map
You can use a route map instead of the neighbor filter-list command to apply access
lists for filtering routes. In Figure 25 on page 91, suppose router Chicago is configured
as follows:
host1(config)#router bgp 293
host1(config-router)#network 192.168.5.0 mask 255.255.255.0
host1(config-router)#neighbor 10.2.2.4 remote-as 17
host1(config-router)#neighbor 10.2.2.4 weight 150
host1(config-router)#neighbor 10.5.5.2 remote-as 32
host1(config-router)#neighbor 10.5.5.2 weight 50
90 â– Configuring BGP Routing Policy
JUNOSe 11.1.x BGP and MPLS Configuration Guide
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