[ssm] Re: last call comments on ssm-arch doc

I wrote:
> Pavlin wrote:
> >  * After enumerating the benefits of the SSM model in Section 1,
> >    what about enumerating its limitations/drawbacks? :)
> 
> Fair enough.  I'll come up with something.

I promised to come up with some text.  How about this:

SSM is particularly well-suited to dissemination-style applications with
a single sender.  It can be used in multi-source applications, but the
multi-source "rendezvous" functionality must be implemented by the
application or by an application-layer library.  For instance, an
application that desires to provide a secondary data source in case the
primary source fails must implement the failover mechanism in the
application itself, presumably by using two channels, as two hosts
cannot both send to a single SSM channel.  SSM does not support network-
layer multicast resource discovery.

-Hugh
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