Effects Of Changing Outbound Policies - Juniper BGP - CONFIGURATION GUIDE V 11.1.X Configuration Manual

JUNOSe 11.1.x BGP and MPLS Configuration Guide
BGP cannot compare them with the attributes in the new update message.
Consequently, BGP cannot determine whether the update contains new attributes
or the same attributes as those previously advertised, and might send superfluous
advertisements to peers. This circumstance does not happen for peer groups, because
their Adj-RIBs-Out tables store the full attribute set.

Effects of Changing Outbound Policies

After you change the outbound policy for a peer or peer group, the policy changes
do not take effect until you issue either a hard clear or an outbound soft clear. (See
"Resetting a BGP Connection" on page 98 for information about performing clears
with the clear ip bgp command.) The clear action causes BGP to reapply the outbound
policy of the peer or peer group to each route in the BGP routing table. BGP then
stores the results in the Adj-RIBs-Out table for that peer or peer group. The BGP
session with each peer or peer group member takes the routes from the appropriate
Adj-RIBs-Out table and sends them in update messages to the peer or peer group
member.
NOTE: You cannot change outbound policy for an individual peer group member.
You can change outbound policy only for a peer group as a whole or for peers that
are not members of a peer group.
neighbor rib-out disable
42
Configuring BGP Peer Groups
Use to disable storage of routes (disable rib-out) in the specified neighbor's
Adj-RIBs-Out table or in a single Adj-RIBs-Out table for the entire specified peer
group.
Route storage is disabled by default.
If you enable storage for a peer, the peer's Adj-RIBs-Out table contains all routes
actually sent to the peer. By contrast, if you enable storage for a peer group, the
peer group's Adj-RIBs-Out table contains those routes that the BGP speaker
intends to send to the peer group members; individual members might or might
not have already received updates that advertise the routes.
If you specify a BGP peer group by using the peerGroupName argument, a single
Adj-RIBs-Out table is enabled for the entire peer group. You can override this
configuration for a member of the peer group by issuing the command for that
peer.
Limit the number of Adj-RIBs-Out tables to no more than ten for peer groups to
conserve memory resources. No limit applies to peers.
This command takes effect immediately and automatically bounces the BGP
session(s) if the command changes the current configuration.
Example
host1(config-router)#no neighbor 10.15.24.5 rib-out disable