MPLS Leg Redundancy

Unanswered Question
Feb 8th, 2008

Hi,

We have a hub and spoke network connected to a service provider MPLS cloud.

Currently we have all the spoke sites on a single leg (CE-PE link)connected to the service provide PE router.

We are planning to have redundancy for the critical legs using VSAT as a backup media at few sites.

Need suggestion on the router configuration:-

1)What should be the routing protocol for the CE-PE link with ethernet handoff for both the primary last mile and VSAT backup. (As ethernet does not go down how the traffic will switchover to VSAT when primary last mile to provider MPLS PE fails...with static route configured on CE-PE link.

2)We are preferring Static routing on the CE-PE link how can we achieve the redundancy between two last miles (Terrestrial and VSAT) with ethernet handoff.

3)ALso in case we go for Dynamic routing protocol...which one should we enable BGP,OSPF,EIGRP or ? how can we achieve the redundancy between two last miles (Terrestrial and VSAT)with ethernet handoff.

Pls suggest with configuration.

Regards

I have this problem too.
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royalblues Tue, 02/12/2008 - 05:37

1. You can use any routing protocol as long as the Service provider is supporting it.

Most of the SP's support only static and BGP.

It is true that when the last mile is ethernet, then the failure is triggered by the expiration of the routing protocol hold time

2. though you can use static routes with object tracking, it is better to use routing protocol between the CE and the PE

3. As said above, this will depend on the protocols the ISP support for peering. For eg if you chose BGP, then you can use local preference/weight attribute and prefer a particular path.

BTW are you going to terminate both the links on the same router?

HTH

Narayan

Mohamed Sobair Tue, 02/12/2008 - 07:53

Hi,

1- Static routes are not prefered in your case, because a failure at one mile cant be detected at other mile.

2- As for (CE-PE) routing protocol , if its Cisco platforms, the powerfull routing protocol that u can use is (EIGRP). because of its convergence time.

HTH

Mohamed

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