[rbridge] Preview of changes for VLANs, etc.

[Eastlake III Donald-LDE008]

The big problem is incremental deployment. Sure, looking at existing
802.3 bridged networks, you almost never have links with both bridges
and end station on them. But with incremental deployment of Rbridges, a
bridged LAN between N Rbridges will commonly look like a through link
that also has end stations on it. And furthermore, it can easily be a
link between these N Rbridges with odd, VLAN dependent connectivity.
Some people in the working group consider the mixed bridges and Rbridges
case very important.
	So, while I'm fine with noticing/configuring point-to-point
Rbridge links and omitting the outer VLAN tag on them, since it pretty
much serves no function, you want a scheme that has a reasonable chance
of working if a link is a complex bridged LAN.

Donald

-----Original Message-----
From: rbridge-bounces at postel.org [mailto:rbridge-bounces at postel.org] On
Behalf Of Russ White
Sent: Tuesday, November 06, 2007 3:15 PM
To: Radia Perlman
Cc: Developing a hybrid router/bridge.
Subject: Re: [rbridge] Preview of changes for VLANs, etc.

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> Certainly I'd love to get rid of the outer VLAN tag. Unfortunately,
> bridges on the link
> can be configured in weird ways such that the only way to send a
packet
> is using a
> particular set of VLAN tags. Then there are other complicated issues,

Since this is probably going to be 5% or less of the cases, we should
make this capability optional, and make the 95% case the simpler case of
sending with no vlan tag. The only case this really arises in is when
you have hosts on links with through traffic, which any good network
designer avoids like the plague.

I'd rather not make this whole thing really complicated just to support
a small set of networks....

:-)

Russ

- --
riw at cisco.com CCIE <>< Grace Alone

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