The MPLS-OPS Archive

["Carlos Patriawan" <carlos@carlos.net>]

----- Original Message ----- 
From: <sthaug@nethelp.no>
To: <luis-m-a-santos@telecom.pt>
Cc: <mpls-ops@mplsrc.com>
Sent: Tuesday, March 23, 2004 11:31 AM
Subject: RE: [MPLS-OPS]: Question about L2VPN over MPLS


> > What would be the minimum bitrate and what access technology, for
> > which it would make economic sense to deploy VPLS?  (as opposed to,
> > for instance, having more "traditional" L3 VPNs such as BGP/MPLS or
> > Virtual Router)
>
> I'm still not sure that's the right question. L2 VPNs (VPLS) and L3
> VPNs (MPLS/RFC 2547 or similar) serve different purposes. Both are
> point to multipoint technologies, so they can basically handle much
> the same topologies.
>
> L3VPNs:
> - Have no issues with MAC learning, spanning tree protocol and similar.
> - Nice if you want the ISP do to routing for you.
> - You need to worry about routing protocol redistribution between BGP
> (ISP) and customer routing protocols. Can strongly influence failover
> times.
> - More mature technology than L2VPNs.
> - IP only.
>
> L2VPNs:
> - You need to worry about MAC learning, spanning tree protocol and
> similar. Can strongly influence failover times (particularly with
> traditional 802.1d).

You can limit the "MAC learning" exposure if VPLS PE is configured
as a router (not switch).This is actually the recommended
deployment.


> - Nice if you want to do the routing yourself.
> - No issues with routing protocol redistribution.
> - Newer technology than L3VPNs, less equipment/fewer vendors that
> support it.
> - Protocol independent.

This is another benefit,you can virtually run any protocol type other than
IP
(IPX/Appletalk,etc).


Carlos

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