Route-Refresh Capability; Cooperative Route Filtering - Juniper BGP - CONFIGURATION GUIDE V 11.1.X Configuration Manual

JUNOSe 11.1.x BGP and MPLS Configuration Guide

Route-Refresh Capability

The route-refresh capability provides a lower-cost alternative to soft reconfiguration
as a means to change policies without major disruptions. The router advertises the
route-refresh capability when it establishes a BGP session with a peer to indicate that
it is capable of exchanging BGP route-refresh messages. If inbound soft reconfiguration
is disabled (the default) and you issue the clear ip bgp soft in command, the router
sends route-refresh messages to its peers that have advertised this capability. The
messages contain a request for the peer to resend its routes to the router. The new
inbound policy is then applied to the routes as they are received.
Our implementation conforms to RFC 2918 Route Refresh Capability for BGP-4
(September 2000), but it also supports nonstandard implementations.

Cooperative Route Filtering

If a BGP speaker negotiates the cooperative route filtering capability with a peer,
then the speaker can transfer inbound route filters to the peer. The peer then installs
the filter as an outbound route filter (ORF) on the remote end. The ORF is applied
by the peer after application of its configured outbound policies. This cooperative
filtering has the advantage of both reducing the amount of processing required for
inbound BGP updates and reducing the amount of BGP control traffic generated by
BGP updates.
clear ip bgp
neighbor capability
100
Configuring BGP Routing Policy
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.
Use to push an ORF to the peer and reapply inbound policy to all received routes
without clearing the BGP session.
You can specify the IP address of a BGP neighbor, the name of a BGP peer group,
or an address family to be cleared.
Use the asterisk (*) to clear all BGP connections.
If the ORF capability is not configured or received on the peer, then the
prefix-filter keyword is ignored and the router performs a normal inbound soft
reconfiguration.
This command takes effect immediately.
There is no no version.
See clear ip bgp.