The MPLS WG Archive

[Ben Black <ben@layer8.net>]

On Thu, Dec 14, 2000 at 03:32:41PM -0500, Dan Tappan wrote:
> At 12:10 PM 12/14/00 -0800, Ben Black wrote:
> >Cisco unpacks the IP datagrams, then processes them?
> 
> 
> in the appropriate error handling case
> 
> >  Ouch.  It appears
> >I was optimistically misinformed.
> 
> Optimistic in what sense? Optimistic that Cisco would field an 
> implementation which would break existing network functionality? Optimistic 
> that someone else could get away with a broken implementation because they 
> hoped Cisco/Juniper had?
> 
> 

If we could step back for a moment: are you talking about edge LSRs or core LSRs
(the difference being an edge LSR processes unlabeled datagrams, while a core
LSR generally does not).  The whole point of this discussion is core LSRs
(specifically, core LSRs communicating path MTU information for the use of edge
LSRs).

There is nothing "broken" about implementations that silently drop too-big
packets.  It is specifically allowed by the drafts, and I agree with it.


ben