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Cell Relay Retreat>List Archive>month:1996-May> msg00142



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Maybe RSVP and Q.2931, but not NHRP

  • From: jhalpern@us.Newbridge.com (Joel Halpern)
  • Date: Wed, 29 May 1996 17:58:14 +0500
  • Cc: ion@nexen.com
  • X-Sun-Charset: US-ASCII

Even if you have I-PNNI, there are at least four reasons you need
NHRP:

1) Router-Host and Host-Router communication
2) Heirarchy.  In the presence of Heirarchy, we will abstract out the
    ATM addresses of the lower level routers
3) Virtual routers - the correct ATM destination for the traffic may not
   actually be the router
4) Other routing protocols.  Even if some of your routers run I-PNNI,
    you want interoperability with other protocols (including OSPF and BGP.)

Also, even if the whole network is using BGP with the "Next-Hop" attribute,
the same kinds of issues apply.

Neither PAR nor full I-PNNI get rid of NHRP.  These are complementary
technologies.

Thank you,
Joel M. Halpern				jhalpern@newbridge.com
Newbridge Networks Inc.