Understanding VRF-lite

When a Layer 3 interface is moved to a VRF instance from the default global VRF domain, or when a Layer 3 interface is moved from one VRF instance to another via command, the interface name and id (ifindex) are never changed as a result of the interface movement. However IP configuration on the interface in the previous VRF is unset (removed) before moving the interface to a new VRF.

ARP entries associated with the Layer 3 interface are cleared when the interface is moved from one VRF instance to another. In addition (static and dynamic) ARP entries are VRF aware, as the same IP address can be used in other VRF instances.

Adding a VRF-aware static ARP

awplus(config)#arp

?

A.B.C.D

IP address of the ARP entry

log

Arp log

 

vrf

VRF instance

awplus(config)#arp

vrf <name> ?

A.B.C.D

IP address of the ARP entry

Route management with VRF

Each VRF instance maintains its own IPv4 routing table independent from the routing table of the global VRF domain or other VRFs.

Routing entries can be added statically by user command or dynamically by a routing protocol module such as BGP, OSPF, or RIP within the VRF instance. Use of a dynamic routing protocol allows for each VRF network to maintain a consistent routing table across all the devices within the VRF network.

The way that each routing is able to define a separate instance of itself on multiple VRF instances varies from protocol to protocol:

For BGP, one BGP routing instance will be running for an Autonomous System in the global VRF domain and individual BGP routing tables will be managed per VRF by using the address-family feature. One address-family is created for each VRF instance.

For OSPF, one OSPF routing instance is configurable per VRF, and one OSPF instance is configurable within the global VRF domain.

For RIP, one RIP routing instance will be running in the default global VRF domain and individual RIP routing tables will be managed per VRF by using the address-family feature. One address-family is created for each VRF instance.

Note: The command show ip route displays the routes associated with each VRF instance.

Configure VRF-lite Page 7

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Allied Telesis C613-16164-00 REV E manual Route management with VRF, Adding a VRF-aware static ARP

C613-16164-00 REV E specifications

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