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Cell Relay Retreat>List Archive>month:1995-May> msg00174



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Resilient ATM

  • From: Masataka Ohta <mohta@necom830.cc.titech.ac.jp>
  • Date: Sat, 20 May 95 16:55:05 JST
  • CC: bryang@eng.adaptec.com, ip-atm@matmos.hpl.hp.com, rae1@PO5.RV.unisys.com

> >I think it is possible right now, without any protocol
> >spec changes, to build a resilient endsystem by having
> >the second ATM NIC register with the same ATM address
> >as the first, when the first fails. The outside world will
> >just see a VCC termination and reestablishment. A switch
> >should detect the first link going down and not reject
> >the second registration as a duplicate address.
> 
> Ok. However, there is a configuration where this doesn't
> work. Suppose you want to build a resilient network, with
> redundant NICs, switches, and servers.  In this case, the
> two NICs connect to different switches.  The network
> portion of the ATM addresses of the two NICs must be
> different.

That is, LIS destroys many of the good properties of the Internet.

Make IP subnet physically contegeous, not logical.

						Masataka Ohta