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Re: one-hop forwarding loops and PLSN

Subject: Re: one-hop forwarding loops and PLSN
From: stefano previdi
Date: Mon, 3 Oct 2005 10:41:07 +0200
Alia, Stewart,

On Sep 29, 2005, at 11:11 PM, Stewart Bryant wrote:

Alia Atlas wrote:

A concern that Mike and Stewart have raised in the past about PLSN is that,
because PLSN doesn't prevent 100% of the loops, there can be
collateral damage due to looping traffic on some links.
What if there were the recommendation that (in this context) packets
cannot be sent back out the same interface that the packets were received on?
That is a change to forwarding, and hence a change to hardware.

As you say below is only a partial solution. On the other hand
we do have solutions that fully solve the problem, one
of which is control plane only change (oFIB/oSPF).
couldn't agree more...

- Stewart

This would solve the collateral damage case for those single-hop loops that aren't
prevented.  Of course, it wouldn't help with the multi-hop loops.
the problem with this approach is that it will be
very hard from an operational perspective to detect
when a loop is expected and when not... so if the
solution doesn't solve 100% of case... I'd rather
look for something else.

s.

Thoughts?
Alia
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