■ Use the no version to remove the interface assignment or discontinue secondary
routing table lookup.
■ See ip vrf forwarding.
Defining Secondary Routing Table Lookup
You can enable secondary routing table lookup on the virtual router routing table of
the parent (global) virtual router. The secondary lookup takes place when the initial
route lookup on a VRF is unsuccessful. You can define secondary routing table lookup
outside the context of the VRF or inside the context of the VRF.
To configure secondary routing table lookup from outside the VRF context:
1. Select the interface.
host1:vr1(config)#interface gigabitEthernet 1/0
2. Specify a VRF and that you want it to perform secondary routing table lookup.
host1:vr1(config-if)#ip vrf forwarding vrfA fallback global
host1:vr1:vrfA(config-if)#ip address 10.12.4.5 255.255.255.0
To specify from inside the VRF context that an interface use the fallback global routing
table lookup:
1. Select the interface.
host1:vr1(config)#interface gigabitEthernet 1/0
2. Enter the VRF context.
host1:vr1(config-if)#virtual-router :vrfA
3. Specify that the VRF perform a secondary routing table lookup.
host1:vr1:vrfA(config-if)#ip fallback global
ip fallback global
■ Use to specify secondary routing table lookup for an interface in a VRF if an
initial routing table lookup is unsuccessful.
■ Example
host1:vr1:vrfA(config-if)#ip fallback global
■ Use the no version to discontinue secondary routing table lookup.
■ See ip fallback global.
ip vrf forwarding
434 ■ Configuring BGP VPN Services
JUNOSe 11.1.x BGP and MPLS Configuration Guide
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