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

["Michael Smith" <mksmith () noanet net>]

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Hello Sam:

We're using the Cisco ML cards in the 15454's.  The inbound port from
the switch is just a .1Q trunk.  The ML cards do the Q-in-Q
encapsulation of all frames coming inbound, although this is just one
configuration scenario that happened to work well for our
application.

These particular cards can take any frame up to 9000 bytes, so
pre-encapsulated traffic types such a Q-in-Q or MPLS frames are no
problem.  We have not seen any issues with encapsulated types, but of
course, your mileage may vary.

Mike

> -----Original Message-----
> From: Sam Stickland [mailto:sam_ml () spacething org]
> Sent: Wednesday, July 07, 2004 3:28 AM
> To: Michael Smith
> Cc: nanog () nanog org
> Subject: RE: 802.17 RPR and L2 Ethernet interoperablity (Ethernet
> over RPR)
>
> Thanks for the reply. Pretty much everyone has told me that it's
> vendor specific, although the implementation mentioned below sounds
> nice. Any chance of naming that vendor?
>
> 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)
>
> Sam
>
> On Tue, 6 Jul 2004, Michael Smith wrote:
>
> > Hello:
> >
> > I think this is pretty provider-specific.  However, we are doing
> > this right now with a particular vendor using their flavor of
> > RPR.  The ring uses Q in Q tunneling in the core and all switches
> > communicate directly to one another using .1Q encapsulated
> > frames.
> >
> > Mike
> >
> > > -----Original Message-----
> > > From: owner-nanog () merit edu [mailto:owner-nanog () merit edu] On
> > > Behalf 
> > Of
> > > sam_ml () spacething org
> > > Sent: Tuesday, July 06, 2004 11:50 AM
> > > To: nanog () nanog org
> > > Subject: 802.17 RPR and L2 Ethernet interoperablity (Ethernet
> > > over 
> > RPR)
> > > Hi,
> > >
> > > This is probably a fairly simply question, I'm probably just
> > > not quite groking the layers involved here.
> > >
> > > If I had the following setup:
> > >
> > > Endstation A -- Switch A === RPR Ring === Switch B --
> > > Endstation B 
> > >
> > > could there be a VLAN setup such that Endstations A and B are
> > > both in 
> > it,
> > > and can communicate as if they are on the same LAN segment?
> > > (And I 
> > mean
> > > natively. ie. not using an MPLS VPN). ie. Will the switches
> > > involved tranlate the different framing formats in use? Is this
> > > vendor 
> > dependent?
> > > Sam


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