Tier-2 reachability and multihoming

Thu Mar 24 04:29:52 UTC 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