Routing

Hi evrybody,

I have one question concerning VPLS : do I need to configure MPLS to use VPLS with BGP. If yes, what is the role of MPLS ?

From my point of view, I must configure also mpls in order to carry mpls label. BGP is the signaling protocol (not only of course) which replace LDP, and not MPLS. Is it correct ?

Thank you guys...

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Daboos

Hi,

Actually we have two perspective to see the VPLS. From the perspective of Control Plane, we need the signalling protocols, such as LDP or BGP. and from the perspective of Forwarding Plane and subscribers' data Encapsulation, we need the MPLS protocol (Martini).

Thanks,

/ shawn

You definitely need also MPLS since forwarding plane for VPLS service is MPLS-based. Layer 2 Ethernet frames are encapsulated with (two) MPLS labels and therefore you need LSP MPLS from each PE to any other PE and also all the PEs need to understand the MPLS inner labels.

You may use any MPLS signaling protocols (LDP or RSVP-TE) to set up PE-PE LSP MPLS, even if the use of LDP (jointly with an IGP routing protocol such OSPF or IS-IS) is the preferred choice (less configuration, less nightmares). Unless you need services such as fast-rerouting (FRR) to speed up convergence.

Bye,

Tiziano

Hi guys,

Thanks for your answer. It confims what I thought.

Regards,

Daboss