RE: [PWE3] PWE3 new WG items? PW QoS

[Rahul Aggarwal <rahul at juniper.net>]

[snip]

>
> we need to define the scope of the problem before we can decide
> on a solution.

That sounds quite reasonable.

rahul

>
>
> > but I am
> > more inclined to have the working group define the scope of
> > the problems first,
> > and then we could decide whether they can be solved by
> > implementation specific
> > mechanisms or a new protocol procedure is necessary.  The
> > current protocol
> > procedures are sufficient for multi-semgent PWs signaling in
> > the sense that they
> > can handle end-to-end setup, teardown, notification, and etc.
> > with proper
> > implementation at the stitching points.
> >
> > ---Wei
> >
> > Busschbach, Peter B (Peter) wrote:
> > >>Actually PW stitching can be implemented entirely using
> > >>existing pseudowire
> > >>signaling procedures (using LDP or L2TP) without any new
> > >>protocol or extension.
> > >>  The signaling protocol is not an issue.
> > >
> > >
> > > Hi Wei,
> > >
> > > I respectfully disagree. The fact that we have a signaling
> > protocol to set up single PW segments doesn't mean that it is
> > clear how to establish multi-segment PWs. E.g.
> > >
> > > - Are segments set up in a random order or is there a need
> > for a certain sequence of message?
> > >
> > > - Is it necessary to use the same values for Interface
> > Parameters on each segment?
> > >
> > > - Is VCCV used on single segments or end-to-end? If the
> > latter, do intermediate points monitor or do they blindly
> > forward the packets?
> > >
> > > - In case a segment goes down, are alarm signals sent to
> > the end-points of the multi-segment PW or is the error
> > handled locally?
> > >
> > > All these, and probably more, need to be specified. On the
> > other hand, if we decide that a multi-segment PW is
> > essentially an LSP that can be set up with RSVP-TE, the
> > RSVP-TE spec provides most of the answers.
> > >
> > > Peter
> > >
> > >
> > >>With regard to PW stitching, this working group probably
> > >>should focus on the
> > >>operational issues with regard to PW stitching, such as
> > >>whether Attachment
> > >>Circuit interworking is needed at the stitching point, how to
> > >>interwork between
> > >>different PSN types, sequencing, multi-hop VCCV, Inter-AS
> > >>considerations and
> > >>other network management subjects.
> > >>
> > >>---Wei
> > >>
> > >
> >
> >
>

_______________________________________________
pwe3 mailing list
pwe3@ietf.org
https://www1.ietf.org/mailman/listinfo/pwe3