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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

• Use to assign a VRF to an interface or subinterface by forwarding the interface from

the VR to the VRF. This command also enables you to specify secondary routing table

lookup for a VRF if an initial routing table lookup is unsuccessful.

• Forwarding the interface removes the IP configuration from the interface. You must

reassign an IP address to the interface after you issue this command.

• The ip vrf forwarding command changes the prompt to indicate that the CLI is now in

Interface Configuration mode within the child VRF. This condition persists only for as

long as you are configuring attributes on the given interface within the VRF. Entering

a top-level command, such as interface, within this VRF context takes the CLI out of

the VRF context back to the parent VR context.

• When you issue the ip vrf forwarding command from within the Interface Configuration

or Subinterface Configuration mode of the parent VR, the IP address and other attributes

of the interface are deleted from the interface. You must then reconfigure the IP

attributes in the context of the VRF after issuing the command.

• Example

host1:vr1(config-if)#ip vrf forwarding vrfA

host1:vr1:vrfA(config-if)#ip address 10.12.4.5 255.255.255.0

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

• Use the no version to remove the interface assignment or discontinue secondary routing

table lookup.

• See ip vrf forwarding.

Adding Static Routes to a VRF

Consider the network structure shown in Figure 92 on page 437. If no routing protocol—BGP

or any other IGP—is running between the PE router and the CE router, you must use the

JunosE 11.2.x BGP and MPLS Configuration Guide

Juniper JUNOSE 11.2.X BGP AND MPLS User Manual

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