North American Network Operators Group
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Re: Tier-2 reachability and multihoming

  • From: Joe Abley
  • Date: Wed Mar 23 23:33:01 2005 
[cisco-nsp-request@ snipped, since it does not seem to belong]

Le 23 mars 2005, à 23:15, G Pavan Kumar a écrit :


here, nodes 2 and 4 have no reachability,
       1
     / |
   2   3  4
  / \   \/ \
 5   6  7   8

now, node 7 is reachable from 2 and its lower level nodes, but what
about
node 4 and 8, and as a typical case, suppose nodes 4 and 8 have no
multihoming whatsoever, what then?
If the verticial position on the page indicates some kind of hierarchy (e.g. 2 and 3 are transit customers of 1, 7 is a transit customer of 3 and 4) then 4 has transit customers but no peering or transit. I would suggest this is not indicative of a realistic business plan in the real network.


Joe