CCIE RS – Routing Concepts – Implement and Troubleshoot VRF Lite

Implement and Troubleshoot VRF Lite

VRF without MPLS

Support different routing tables on the same device

  • Allows for overlapping IP addressing as long as they are in different vrf’s
  • Uses input interfaces to distinguish routes form over vpns

TCAM resources are shared between all vrf’s

Does not support ISIS

Configuration

Following only works with IPv4
ip vrf [name]
rd [route-distinguisher] --> required
route-target {export | import | both} --> optional in vrf-lite
import map route-map

----
Following works with IPv4 and IPv6
vrf definition RED
 rd 1:1
 !
 address-family ipv4
 exit-address-family
 !
 address-family ipv6
 exit-address-family

Interface > ip vrf forwarding [vrf name] --> removes current IP when applied

Router(config-if)#vrf forwarding RED

EIGRP

router eigrp [as]
address-family ipv4 vrf VRF

----

Router(config)#router eigrp NAMED
Router(config-router)#address-family ipv4 vrf RED as 1

OSPF

router ospf [process id] vrf [vrf name]

BGP

router bgp [as]
address-family ipv4 vrf [vrf name]

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