RE: draft-bonica-tunneltrace-02

[neil.2.harrison@bt.com]

George....you are simply wrong here *if* applied architecturally correctly.
But please explain/list examples of layer violations you are aware of.
BTW - If anyone takes what you have written at face value then all tunnels
should be banned, ie they are *all* layer violations (I see Shahram also
noted exactly similar).  Sadly, from what I see you may be actually correct
in many cases (ie relying on fault management of one layer to proxy for
inadequacies in another layer)....but you'd need to think the consequences
of that out very carefully and the potential implications before you take it
further.

In the meantime.....

Think of a leased line (as a server...any technology) that you do not
own.....or even a duct network (yes its a real network, bottom layer in
fact....and sets the inherited disjoint connectiveity graph for *all* layers
above it) that you do not own, and I am aware of Andy Reid of BT here
telling me you lost a bet with him over virtualisation here.  A 'Tunnel' is
a colloquialism for a (more formally defined) server layer trail (which can
be a link connection between client layer nodes).  If you don't/can't grok
this yet please read the text book by Reid/Sexton on Broadband Networking or
G.805.....and tell us what is factually wrong with what is in there.  I am
finding these terse 'I know better than you' assertions not all
constructive....esp when they are plainly wrong, like this one (*if* done
arch correctly of course).

Neil

> -----Original Message-----
> From: George Swallow [mailto:swallow@cisco.com]
> Sent: 28 February 2002 17:12
> To: Shahram Davari
> Cc: 'Randy Bush'; Cuevas, Enrique G, ALASO; ccamp@ops.ietf.org;
> swallow@cisco.com
> Subject: Re: draft-bonica-tunneltrace-02 
> 
> 
> Shahram -
> 
> > and layer violation issues.
> 
> Any sort of a tunnel is a layer violation in and of itself.  So if you
> have to violate those same layers to trace them so be it.
> 
> ...George
> 
> ==================================================================
> George Swallow       Cisco Systems                  (978) 497-8143
>                      250 Apollo Drive
>                      Chelmsford, Ma 01824
>