[81120] in North American Network Operators' Group
Re: BCP regarding TOS transparancy for internet traffic
daemon@ATHENA.MIT.EDU (Sean Donelan)
Wed May 25 21:06:42 2005
Date: Wed, 25 May 2005 21:06:15 -0400 (EDT)
From: Sean Donelan <sean@donelan.com>
To: "Eric A. Hall" <ehall@ehsco.com>
Cc: nanog@nanog.org
In-Reply-To: <42951EAC.2090502@ehsco.com>
Errors-To: owner-nanog@merit.edu
On Wed, 25 May 2005, Eric A. Hall wrote:
> Again, you are under no obligation to do anything with QoS flags from
> non-paying customers, and I'm not advocating for anybody to get a free
> ride here. Ignore the markings, but leave them alone too.
Are you suggesting every router along the path needs to have a table
lookup of every customer and which DSCP/TOS bits are valid for packets
to or from that customer and which DSCP/TOS bits should be ignored.
Diffserv is hop-by-hop, with each hop making a choice.
Do you really think this scales well in a core network?
If you want bit streams: TDM, ATM or Frame-Relay works well. But in
the IP world, packets may be fragemented by intermediate nodes, TTL
values are decremented, ECN bits are changed. Packet headers are
changed on every packet passing through an IP network.
