The MPLS WG Archive

[Ben Mack-Crane <Ben.Mack-Crane@tellabs.com>]

As far as I know, the control path and data path are not entirely
convergent for MPLS.  The control packets do not follow the same
data path through a router as the data packets, and thus are not subject
to the same failures.

Regards,
Ben

Giles Heron wrote:
> 
> neil.2.harrison@bt.com wrote:
> [snip]
> > If one agrees to the fact that these (OAM functions) are
> > present/valid/required in SDH etc and hence in GMPLS, then one should not
> > argue that they don't apply to other CO technologies.  An ER/signalled p2p
> > LSP is a trail, in G.805 parlance, irrespective of whether wants to try and
> > camouflage this fact or not...and so the same principles apply.  You can't
> > argue it both ways IMO.
> > <snipped to end>
> 
> I'm not sure I agree with this conclusion.
> 
> isn't one key difference between SDH/GMPLS etc. and MPLS the fact that
> for an MPLS LSP the control plane is convergent with the data plane?
> Sure for TE LSPs the LSP path isn't generally convergent with the IGP,
> but it is convergent with the RSVP-TE control traffic.
> 
> Giles
> 
> --
> =================================================================
> Giles Heron    Principal Network Architect    PacketExchange Ltd.
> ph: +44 7880 506185              "if you build it they will yawn"
> =================================================================