Re: [CCAMP] Questions ondraft-bellagamba-ccamp-rsvp-te-mpls-tp-oam-ext-04

Elisa,
I totally agree with Adrian suggestion.

Adrian,
thank you for reminding about the BFD draft (I think I've missed it
altogether)."Friendly inquiry" to BFD will be extremely helpful.

Regards,
Greg

On Thu, Feb 11, 2010 at 8:14 AM, Elisa Bellagamba <
elisa.bellagamba@ericsson.com> wrote:

> Adrian,
>
> Thanks for a very useful comment and support. This change would work for
> me.
>
> Greg,
>
> Would it work for you too?
>
> Elisa
>
> -----Original Message-----
> From: Adrian Farrel [mailto:adrian@olddog.co.uk]
> Sent: den 11 februari 2010 17:03
> To: Greg Mirsky; Elisa Bellagamba; Loa Andersson
> Cc: ccamp@ietf.org
> Subject: Re: [CCAMP] Questions
> ondraft-bellagamba-ccamp-rsvp-te-mpls-tp-oam-ext-04
>
> Hi Greg,
>
> draft-katz-ward-bfd-multipoint-02 invested some effort on P2MP BFD. The
> concepts are understood, but I think this timed out while the BFD WG
> invested time polishing the base BFD work (almost done now!).
>
> Might be worth pinging the BFD WG to find out their plans.
>
> Might be worth *this* I-D making a subtle change in language to say "and
> may
> be extended to P2MP..."
>
> Cheers,
> Adrian
>
> ----- Original Message -----
> From: "Greg Mirsky" <gregimirsky@gmail.com>
> To: <elisa.bellagamba@ericsson.com>; <loa.andersson@ericsson.com>
> Cc: <ccamp@ietf.org>
> Sent: Wednesday, February 10, 2010 10:43 PM
> Subject: [CCAMP] Questions
> ondraft-bellagamba-ccamp-rsvp-te-mpls-tp-oam-ext-04
>
>
> > Dear Authors,
> > the second paragraph of Introduction says that BFD can be used to "track
> > liveliness of MPLS-TP point-to-point and p2mp connections". I think that
> > unless multiple BFD sessions, one per each leaf, are being established
> BFD
> > cannot be used to monitor p2mp MPLS-TP connection. The main issue, as I
> > see
> > it, being session demultiplexing based on end node discriminator. Unless
> > BFD
> > changes so that ingress node can list multiple entities as Your
> > Discriminator, BFD will remain p2p mechanism.
> > The first paragraph of Section 3.1 says that both end nodes of BFD
> session
> > "should be in active mode". Is that "SHOULD"? I think that since the BFD
> > session is bootstrapped the ingress node SHOULD be in Passive mode and
> > egress node MUST be in Active mode.
> > Even more so. I think that MPLS-TP does not significantly benefit from
> BFD
> > session bootstrapping, OOB exchange of discriminators, because it was
> > added
> > to LSP Ping to address ambiguity resulted from PHP, which is excluded
> from
> > MPLS-TP.
> >
> >
> > Regards,
> > Greg
> >
>
>
>
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>