The Routing Over Large Clouds Mailing List Archive by date

[Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>]

> With regard to TTL, CSRs, and NHRP - decrementing TTL guarantees that
> if routing screws ups, packets won't loop forever.

It is actually a link layer (non-)problem of ATM.

> If you have a box
> that participates in IP routing, but TTL doesn't decrement when
> packets traverse that box, then a bug in the routing code can result
> in infinitely looping packets.

If you have a box
that participates in PNNI routing, but TTL doesn't decrement when
cells traverse that box, then a bug in the routing code can result
in infinitely looping cells. Thus, a true ATM switch
(with the emphasis on swich) decrement TTL, UNLESS it doesn't
participate in the PNNI routing algorithm.

Hmmm, so, ATM lacking TTL, you think ATM switchs shouldn't
participate in PNNI routing.

Use Ipsilon.

To me, policed ATM is good enough, because a transient loop of
a flow won't affect other flows.

						Masataka Ohta