[72352] in North American Network Operators' Group
RE: 802.17 RPR and L2 Ethernet interoperablity (Ethernet over RPR)
daemon@ATHENA.MIT.EDU (Sam Stickland)
Wed Jul 7 09:15:18 2004
Date: Wed, 7 Jul 2004 14:17:54 +0100 (BST)
From: Sam Stickland <sam_ml@spacething.org>
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: nanog@nanog.org
In-Reply-To: <Pine.LNX.4.44.0407071250460.24876-100000@uplift.swm.pp.se>
Errors-To: owner-nanog-outgoing@merit.edu
On Wed, 7 Jul 2004, Mikael Abrahamsson wrote:
>
> On Wed, 7 Jul 2004, Sam Stickland wrote:
>
> > One question about this, the Q-in-Q tunnelling would have to take place on
> > the switch connected to the ring - what happens if the packet has already
> > been placed in a dot1Q tunnel? I haven't really worked much with dot1Q
> > tunneling - are their any know problems with extra tags? (aside from MTU
> > issues, but I imagine most rings will support at least 9bytes)
>
> Most switches will only see the outer tag and will thus be transparent for
> Q-in-Q:ed packets.
That was my worry - the definition of most. 99% of switches or 60%? This
isn't actually a standard is it, so I presume this behaviour is expected,
but not required?
Sam
