RE: 802.17 RPR and L2 Ethernet interoperablity (Ethernet over RPR)

[Sam Stickland <sam_ml () spacething org>]

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