Re: Multi-Area TE Protocol Extensions

[Yakov Rekhter <yakov@juniper.net>]

Dimitri,

> yakov, 
> 
> i think this i-d provides a fair amount of valuable 
> input thus wouldn't be just better to submit an 
> updated version (since the registers value should
> be updated anyway) also it fits imho in the context 
> of the ccamp even more largely than just for ma-te

I fully agree with you. I hope that the author of this i-d
would be kind enough to resubmit it.

Yakov.

> 
> thanks,
> - dimitri.
> 
> Yakov Rekhter wrote:
> > 
> > Dimitri,
> > 
> > > > this ID does not propose a mechanism to compute inter-area TE path
> > >
> > > well i would say that either none of them does it, or all of
> > > them, more accurately route exclusions are applicable to any
> > > mpls network where full computation of the ero is not performed
> > > before the LSP is signaled, implying thus a "scope" for computed
> > > path thus among other applicable to multiple areas - nevertheless
> > > i agree that a next version of this i-d should probably include
> > > an applicability section covering this in a bit more details (see
> > > also section 4.1 for an example -
> > >
> > > this said and as for any other input or i-d provided on constraint-
> > > passing (as well as path query, btw) lot of work is still needed to
> > > achieve a decent first step in this effort;
> > 
> > On the subject passing constraint, I'd like to mention
> > draft-kompella-mpls-rsvp-constraints-00.txt (expired, but I could
> > provide a copy upon request). It contains a fairly general mechanism
> > for passing constraints in RSVP.
> > 
> > Yakov.
> > 
> > >
> > > thanks,
> > > - dimitri.
> > >
> > > Jean Philippe Vasseur wrote:
> > > >
> > > > Hi Dimitri,
> > > >
> > > > cc'ing CCAMP - see in line,
> > > >
> > > > At 17:45 10/12/2002 +0100, Dimitri.Papadimitriou@alcatel.be wrote:
> > > > >jp,
> > > > >
> > > > >in fact the below list should simply be as follows for
> > > > >signalling-based methods: 1) constraint-passing 2) loose
> > > > >routing and 3) path query;
> > > > >
> > > > >and the for constraint-passing we have a several i-d's
> > > > >such as,
> > > > >
> > > > >http://www.ietf.org/internet-drafts/draft-lee-ccamp-rsvp-te-exclude-ro
ute-
> > 01.txt
> > > > >
> > > >
> > > > this ID does not propose a mechanism to compute inter-area TE path
> > > >
> > > > >constraint passing may also be extended using the crank-
> > > > >back as listed below; the usage scenarios of these methods
> > > > >are described in the following:
> > > > >
> > > > >http://www.ietf.org/internet-drafts/draft-kompella-mpls-multiarea-te-0
3.tx
> > t
> > > > >
> > > > >now probably it is worth spending some time in considering
> > > > >input coming from the tewg wrt to this effort, most of the
> > > > >input that you see listed above has been produced over the
> > > > >past year (and more) i can't imagine stepping in the protocol
> > > > >details without a clear consensus on what do we want to cover
> > > > >within the ccamp wg & w/o taking into account the tewg rec's
> > > > >(probably better to discuss this on the ccamp mailing list)
> > > >
> > > > Fully agree with you. Hopefully multi-area TE should be soon part of th
e
> > > > CCAMP charter.
> > > >
> > > > JP.
> > > >
> > > > >thanks,
> > > > >- dimitri.
> > > > >
> > > > >Jean Philippe Vasseur wrote:
> > > > > >
> > > > > > Hi,
> > > > > >
> > > > > > At 13:53 10/12/2002 +0530, sachin laddha wrote:
> > > > > > >Hi,
> > > > > > >'draft-ash-multi-area-te-reqmts-01.txt' stated in section 5 as
> > > > > > >"Initial requirements are given here for protocol support of the
> > > > > multi-area
> > > > > > >TE methods, which include needs to support
> > > > > > >
> > > > > > >*       path-computation-server (PCS) functionality [kompella, lee
,
> > > > > vasseur,
> > > > > > >te-qos-routing],
> > > > > > >*       query functionality [query, vasseur],
> > > > > > >*       crankback functionality [crankback],
> > > > > > >
> > > > > > >and, optionally,
> > > > > > >
> > > > > > >*       TE feedback functionality [feedback], and
> > > > > > >*       summary-LSA functionality [summary_lsa]."
> > > > > > >.
> > > > > > >I want to know whether cisco/juniper routers (standard ones) suppo
rts
> > > > > all of
> > > > > > >the above extension.
> > > > > > >or if not,how many.......or Whether router is supposed to support 
how
> > many
> > > > > > >...
> > > > > >
> > > > > > I do not think any vendor supports all the method mentioned above, 
but
> > just
> > > > > > a subset. If you are running a network, your feed-backs on your pre
ferr
> > ed
> > > > > > method is very welcome.
> > > > > >
> > > > > > JP.
> > > > > >
> > > > > > >Regards,
> > > > > > >---Sachin
> > > > >
> > > > >--
> > > > >Papadimitriou Dimitri
> > > > >E-mail : dimitri.papadimitriou@alcatel.be
> > > > >Private: http://www.rc.bel.alcatel.be/~papadimd/index.html
> > > > >E-mail : dpapadimitriou@psg.com
> > > > >Public : http://psg.com/~dpapadimitriou/
> > > > >Address: Fr. Wellesplein 1, B-2018 Antwerpen, Belgium
> > > > >Phone  : Work: +32 3 2408491 - Home: +32 2 3434361
> > >
> > > --
> > > Papadimitriou Dimitri
> > > E-mail : dimitri.papadimitriou@alcatel.be
> > > Private: http://www.rc.bel.alcatel.be/~papadimd/index.html
> > > E-mail : dpapadimitriou@psg.com
> > > Public : http://psg.com/~dpapadimitriou/
> > > Address: Fr. Wellesplein 1, B-2018 Antwerpen, Belgium
> > > Phone  : Work: +32 3 2408491 - Home: +32 2 3434361
> > >
> 
> -- 
> Papadimitriou Dimitri 
> E-mail : dimitri.papadimitriou@alcatel.be 
> Private: http://www.rc.bel.alcatel.be/~papadimd/index.html
> E-mail : dpapadimitriou@psg.com
> Public : http://psg.com/~dpapadimitriou/
> Address: Fr. Wellesplein 1, B-2018 Antwerpen, Belgium
> Phone  : Work: +32 3 2408491 - Home: +32 2 3434361