• This command takes effect immediately.
• There is no no version.
• See clear bgp ipv6.
• See clear ip bgp.
Changing Policies Without Disruption
Changing policies can cause major network disruptions when you bring down sessions
to reapply the modified policies. You can use either of the methods in this section to
minimize network disruptions.
Soft Reconfiguration
You can use soft reconfiguration to enable the nondisruptive reapplication of inbound
policies. Issuing the command causes the router to store copies of the routes received
from the specified peer or from all members of the specified peer group. The route copies
are stored unmodified, before application of inbound policies.
If you then change your inbound policies, you can apply them to the stored routes without
clearing your BGP sessions—and causing network disruptions—by issuing the clear ip
bgp soft in command.
neighbor soft-reconfiguration inbound
• Use to initiate the storage of copies of routes received from the specified IP address
or from all members of the specified peer group.
• Use with the clear ip bgp soft in command to reapply inbound policies to stored routes
without clearing the BGP sessions.
• Example
host1(config)#router bgp 37
host1(config-router)#neighbor 192.168.1.1 remote-as 42
host1(config-router)#neighbor 192.168.1.1 soft-reconfiguration inbound
• 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.
• If the route-refresh capability was negotiated with the peer, BGP immediately sends
a route-refresh message to the peer to populate the Adj-RIBs-In table.
If the route-refresh capability was not negotiated with the peer, BGP automatically
bounces the session. The Adj-RIBs-In table is repopulated when routes are received
from the peer after the session comes back up.
• Use the no version to disable storage of the route copies. Use the default version to
remove the explicit configuration from the peer or peer group and reestablish inheritance
of the feature configuration.
• See neighbor soft-reconfiguration inbound.
97Copyright © 2010, Juniper Networks, Inc.
Chapter 1: Configuring BGP Routing
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