[SSM] Some comments on a New Internet draft.

[Sang-Ha Kim <shkim@cclab.cnu.ac.kr>]

Sang-Ha Kim wrote:

   This is the second request for some comments of a new Internet draft
   T
       Hierarchical Scheme for Source-Specific Multicast Deployment

           <draft-kim-ssm-hierarchical-scheme-00.txt>

   Abstract:
     Source-Specific Multicast (SSM) has been proposed to overcome the
     deployment limitations of PIM-SM such as handling of well-known
     sources, access control, and address allocation. However, current
     SSM work seems to neglect some other deployment issues such as the
     construction of the shortest path tree especially in inter-domain. 
     The routing table entries for constructing SSM tree proportionally
     increase depending on the number of sources and groups. That is,
     SSM will bring scalability issues like current Internet standard
     multicasts when it is applied to inter-domain or core networks. In
     order to allow SSM to be deployed on Internet core networks,
     hierarchical consideration should be additionally augmented into
     the SSM scheme. This document specifies a hierarchical scheme,
     which uses not only existing SSM scheme within intra-domain, but 
     also an automatic tunneling between a source and a border gateway 
     router in inter-domain.

You can get a copy online at
<http://search.ietf.org/internet-drafts/draft-kim-ssm-hierarchical-scheme-00.txt>.

     Sang-Ha.