All things related to multicast

[Joel Jaeggli <>]

On Wed, 9 Jul 2003, Lorenzo Vicisano wrote:

> On Wed, Jul 09, 2003 at 02:17:38PM -0700, Joel Jaeggli wrote:
> > 
> > It was never clear to me why a host to router signaling mechanism had 
> > to be different from the router to router signaling mechanism.
> 
> one reason is because a host just needs to signal that is wants to
> receive multicast on a link, while a router cooperates with other
> routers to forward multicast in some optimized way. Hence the
> statement "I want to receive from this link" is typically not
> sufficient.

so why can't I just send an s,g join towards s using pim instead of nicely 
using igmp to get my first hop router to do it for me?
 
>       Lorenzo
> 
> > 
> > 
> > On Wed, 9 Jul 2003, David Meyer wrote:
> > 
> > > 
> > >   I guess the more things change, the more they stay the
> > >   same. 
> > > 
> > >   So another thing occurred to me while reading the
> > >   Multicast Last-Mile Solutions drafts on Greg's site: Why
> > >   are we defining yet another ad-hoc signaling protocol
> > >   (that is one way to looks at these proposals)? The IETF
> > >   literature is littered with signaling proposals, some
> > >   host-based, some router-based, at varying degrees of
> > >   generality. 
> > > 
> > >   Straw person: why not have the host send a PATH message
> > >   towards the source (since it knows the source) and have
> > >   the first multicast capable router in the path send back
> > >   the its tunnel endpoint, have the host set up GRE (or
> > >   user space encap) to that router and ...
> > > 
> > >   What I am suggesting is we really don't have a general
> > >   purpose host-to-router signaling protocol (well,
> > >   maybe). So if we pick one of the current drafts (or a
> > >   hybrid, or even new), will we have to build a new
> > >   signaling infrastructure for the next feature not
> > >   supported by the directly connected routers? 
> > > 
> > >   Seems like we should be able to answer this question in a
> > >   more general way than is done in these drafts.
> > > 
> > >   Dave
> > > _______________________________________________
> > > Mtp mailing list
> > > 
> > > http://www.shepfarm.com/mailman/listinfo/mtp
> > > 
> > 
> > -- 
> > --------------------------------------------------------------------------
> >  
> > Joel Jaeggli              Academic User Services   
> > 
> >     
> > --    PGP Key Fingerprint: 1DE9 8FCA 51FB 4195 B42A 9C32 A30D 121E      --
> >   In Dr. Johnson's famous dictionary patriotism is defined as the last
> >   resort of the scoundrel.  With all due respect to an enlightened but
> >   inferior lexicographer I beg to submit that it is the first.
> >                         -- Ambrose Bierce, "The Devil's Dictionary"
> > 
> 

-- 
-------------------------------------------------------------------------- 
Joel Jaeggli          Academic User Services   

    
--    PGP Key Fingerprint: 1DE9 8FCA 51FB 4195 B42A 9C32 A30D 121E      --
  In Dr. Johnson's famous dictionary patriotism is defined as the last
  resort of the scoundrel.  With all due respect to an enlightened but
  inferior lexicographer I beg to submit that it is the first.
                            -- Ambrose Bierce, "The Devil's Dictionary"