Juniper JUNOSE 11.2.X BGP AND MPLS User Manual

Figure 102: Fallback Global Option
If BGP finds a route in the VRF context, it uses that route. If BGP does not find a route in
the VRF context but does find a route in the VR context, it falls back on the global route
in the parent VR. BGP drops the packet if it does not find a route in either context.
To enable fallback global on a PE-CE IP interface:
host1:pe1(config)#interface atm2/0.11
host1:pe1(config-if)#ip vrf forwarding pe11 fallback global
host1:pe1:pe11(config-if)#atm pvc 11 0 11 aal5snap
host1:pe1:pe11(config-if)#ip address 10.11.11.1 255.255.255.0
host1:pe1:pe11(config-if)#exit
See “Defining Secondary Routing Table Lookup” on page 435 for more information.
Configuring a Global Import Map for Specific Routes
For the third solution you create a global import map to import only the specific routes
needed to reach the desired small number of networks in the Internet. See Figure 103 on
page 465.
Copyright © 2010, Juniper Networks, Inc.464
JunosE 11.2.x BGP and MPLS Configuration Guide

Juniper JUNOSE 11.2.X BGP AND MPLS Specifications

General

Brand	Juniper
Model	JUNOSE 11.2.X BGP AND MPLS
Category	Software
Language	English