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Table 60: Route-Target Filtering Advertisement Rules for Routes Received from
Peers
(continued)
Advertise to EBGP
Confederation
Peer? Advertise
to EBGP
Peer?
Advertise to
IBGP Route
Reflector
Nonclient? Advertise to
IBGP Route
Reflector
Client?
Routes Received From
Yes Yes No Yes IBGP route reflector
nonclient
Yes Yes Yes Yes EBGP peer
Yes Yes Yes Yes EBGP confederation peer
Advertising to IBGP clients varies from the standard advertisement rules in terms of
path attribute modifications. When locally originated RT-MEM-NLRI routes are
advertised to IBGP route reflector clients, BGP does the following:
■
Sets the originator ID as the router ID of the advertising router.
■
Sets the next hop as the local address of the session.
This behavior is useful when the route reflector does not advertise the
Default-RT-MEM-NLRI route.
When locally originated RT-MEM-NLRI routes are advertised to IBGP route reflector
nonclients, the route from the client is advertised to the nonclient peer when the
best path route is advertised by a nonclient but an alternative route from a client
exists. This behavior signals the client’s interest in the route target routes that were
not selected as the best path.
You cannot filter RT-MEM-NLRI routes with inbound policies or outbound policies,
because policy items cannot currently match a RT-MEM-NLRI prefix (origin AS
number:route target). However, you can filter route-target filtering routes with policies
that include items that match on other BGP attributes, such as the extended
community attached to the route-target filtering route.
bgp wait-on-end-of-rib
■
Use to configure how long BGP waits to receive End-of-RIB markers from
route-target address family peers.
■
The wait interval applies to all route-target address family peers.
■
This command takes effect immediately.
■
Example
host1(config-router)# address-family route-target signaling
host1(config-router-af)# bgp wait-on-end-of-rib 360
■
Use the no version to restore the default wait interval, 60 seconds.
■
See bgp wait-on-end-of-rib.
Constraining Route Distribution with Route-Target Filtering
■ 407
Chapter 5: Configuring BGP-MPLS Applications