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Per-VRF Traffic Engineering

mel_bs
Level 1
Level 1

Hi,

Could anyone show how to configure a Per-vrf traffic engineering in MPLS Backbone?

Thanks,

Mel Sebastian

5 Replies 5

Kypamop
Level 1
Level 1

Hi,

Dunno actually if the feature exists in IOS now. If you have a link about this please post it here.

Maybe you should try to play with different Loopback addresses. For instance create two Loopbacks on the tail-end, then setup two TE-tunnels from head-end. Be sure to advertise VRFs with different next-hop (pointing to Lo1 and Lo2 accordingly) via MP-BGP. But i'm not sure that there's no "hidden obstacles" with this scenario.

Harold Ritter
Cisco Employee
Cisco Employee

Mel,

One way to do it is

- Setup a tunnel (no autoroute announce) on the ingress PE

- configure a static route through that tunnel interface as follow:

ip route x.x.x.x 255.255.255.255 tu0

- And use this same address as the bgp next-hop on the egress PE using the following command:

ip vrf xxx

bgp next-hop loxx

This way only the traffic destined to this address will traverse this specific tunnel.

Hope this helps,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Hi,

I have plotted below a similar configuration to my customer setup for the per-vrf TE which you suggest.

PE2 is a central vrf and has extranet to customer 1 and 3 vrf?s. Since there will be a defined bgp nex-hop on the cust_1 vrf pointing to PE2, and while central vrf will also have bgp next-hop pointing to PE1, what will happen to the PE2 central vrf going to PE3 cust_3 vrf traffic?

==============================================

PE1 :

ip vrf cust_1

rd 1:1

route-target export 1:1

route-target import 1:1

bgp next-hop Loopback1

!

interface Loopback1

description NEXT_HOP VRF cust_1

ip address 192.168.1.211 255.255.255.255

!

ip route 192.168.1.221 255.255.255.255 Tunnel1

PE2 :

ip vrf central

rd 1:2

route-target export 1:2

route-target import 1:2

route-target export 1:1

route-target import 1:1

route-target export 1:3

route-target import 1:3

bgp next-hop Loopback1

!

interface Loopback1

description NEXT_HOP VRF cust_1

ip address 192.168.1.221 255.255.255.255

!

ip route 192.168.1.211 255.255.255.255 Tunnel1

!

!

PE3 :

ip vrf cust_3

rd 1:3

route-target export 1:3

route-target import 1:3

!

==============================================

Thanks,

Mel

Traffic from PE2 to PE3 and vice versa will continue to be routed through the LDP signaled LSP and therefore following the IGP route.

Hope this helps,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Hi,

Thanks for your help and time...

Mel

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