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Re: ISP scenarios comments (multicast)
On Wed, 18 Sep 2002, bkhabs wrote:
> >On Wed, 18 Sep 2002 18:25:58 0300 (EEST) Pekka Savola <email@example.com>
> > * multicast issues
> > - support is yet a bit .. raw or non-existant.
> Are you talking standards or implementations?
As for standards, there is the problem with MSDP. Another partially
related one is related to site-local group scoping. There needs to be
some feature like 'bsr-border' to site-local scopes to work properly
inside only one PIM domain, I think.
I had some intention to write a short draft on these open issues, but the
idea is still waiting at wg chairs'/AD's inbox (or /dev/null, possibly).
> > - there is no MSDP, so there can be only one PIM domain currently
> Dave Meyer (MSDP chair) and I have gone around and around on this
> issue. The last time we discussed it the consensus was that SSM was
> going to be the dominant multicast environment. If people really
> needed inter-domain ASM support, BGMP would fill that role. Now,
> I am not so sure if BGMP is really worth considering or not given
> its complexity.
I agree. Main use of ASM is videoconferencing, and I believe this could
be done adequately by one SSM "hub".
I believe BGMP hasn't been implemented by anyone.
> > - should we focus on SSM only
> For the short term definitely.
I believe most don't realize that's the only option at the moment.
> The key is going to be getting
> vendors to support MLDv2 and PIM-SM with SSM support ASAP.
> The nice thing about the MSDP spec is that in order to make it
> IPv6 capable, three new IPv6 TLVs and the rest of the machinery
> should stay the same.
It's good to hear that.
Pekka Savola "Tell me of difficulties surmounted,
Netcore Oy not those you stumble over and fall"
Systems. Networks. Security. -- Robert Jordan: A Crown of Swords