mpls and multiple paths

[jonathan johnson]

Hi,

I have a question about what the best method to configure an MPLS network where there are two WAN links between sites.  The intention of the second link is to be a backup and will be only used if the primary goes down.  I don't want to use the backup link under normal circumstances as I will keep its bandwidth turned down to save money, then turn it up when required - I know it's a painful manual task, but it will have to do for now.

To stop traffic from using the backup link during normal operation would I use a local pref or prepend routes (I'm using iBGP throughout the network) or do I need to start using TE so I can define paths?  Or is there a better way to achieve this?

Any advise on this would be appreciated.

Thanks,

Jonno

[cofee]

Hi,

My understanding is your sites are connected via mpls and also there is a separate WAN link  for back up over which you are running ibgp. if my understanding is current I believe you will run into other issues  and will need to manipulate bgp route attributes to make it work the way you want to.

whether you should use local preference or as prepend, I would say one should use both so that way you can control both outbound and inbound traffic.

it would be helpful if you can provide us a with a drawing of your network.