VRF

• Visualizing a router. This is not about MPLS, although that is where the VRF concept comes from.

• http://www.shafagh.net/2009/10/vrf-lite.html

• Example of routing beteen vrf-light using BTP http://packetlife.net/blog/2010/mar/29/inter-vrf-routing-vrf-lite/

• Once a router has VRF software the interface must be upgraded to support VRF.

  •       (config)#vrf upgrade-cli

• Sample Switch config with bgp and vrf.

Switch(config)# router bgp 800
Switch(config-router)# address-family ipv4 vrf vl2
Switch(config-router-af)# redistribute ospf 2 match internal
Switch(config-router-af)# neighbor 83.0.0.3 remote-as 100
Switch(config-router-af)# neighbor 83.0.0.3 activate
Switch(config-router-af)# network 8.8.2.0 mask 255.255.255.0
Switch(config-router-af)# exit

OSPF problems

• Experienced problems where a router, connected to service provider MPLS using ospf area x, running vrf-lite, and connecting to area 0 on internal network would not show the area 0 routes.
  • Problem was caused by ospf superbackbone rules that kicked in due to putting the ospf instance in a vrf
  • Solution under ospf instance use command #capability vrf-lite

• Ospf in MPLS VPN environment.

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CategoryCisco