MPLS routing question

[carl_townshend]

Hi all

When I get an MPLS from my provider, If I have site A and site B both with CE routers,  would these 2 routers look like they are directly connected via the providers network?

How is this done?

cheers

[Joseph W. Doherty]

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Posting

Depends on what the MPLS provider can provide and is providing.  You might have what appears to be a direct p2p L2 connection,or eBGP peering to a provider ASN, or native MPLS, or etc.

[fb_webuser]

With L2 MPLS circuit the Service Provider can provision L2 circuits over MPLS, but when you are talking about CE-routers, generally speaking your are talking about a L3 MPLS VPN. Your CE-routers will be communicating with the Service Provider's PE routers, hopefully with BGP, but possibly your IGP protocol of choice. If you are running EIGRP or OSPF, normally thing will look like they were pretty much connected within the same local routing domain. I usually recommend BGP for CE-PE routing, but there are of course scenarios that will force you to make decisions to choose other protocols. EIGRP and OSPF will work just fine, if your SP supports it, as long as they are not multi-homed. If they are multi-homed, you have to implement mechanisms or "tags" to tell the PE routers where the traffic is coming from, but I won't go in to them here. Have fun

HTH

Atle

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Posted by WebUser Atle Ørn Hardarson

[jamiegrive]

It really depends on the service being offered - MPLS VPN, EoMPLS, VPLS, etc.

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