[rbridge] Final outcome of outer VLANtagsonRBridge-RBridgepackets?

[Silvano Gai]

Anoop,

I disagree.

We started all this discussion because you said that sending LSP on all
the VLANs was not scalable.

Now we discovered that there is a standard, existing solution that uses
Hellos on multiple VLANs for discovery and send LSP only on one VLAN.

This solution is robust and not subject to the corner cases that are
possible if you don't send Hellos on all the VLANs.

Let's use it, not invent anything new and close this topic.

-- Silvano


> -----Original Message-----
> From: Anoop Ghanwani [mailto:anoop at brocade.com]
> Sent: Tuesday, October 23, 2007 4:42 PM
> To: Dinesh G Dutt
> Cc: Silvano Gai; Radia Perlman; Developing a hybrid router/bridge.
> Subject: RE: [rbridge] Final outcome of outer VLANtagsonRBridge-
> RBridgepackets?
> 
> Hi Dinesh,
> 
> It doesn't look like it would be essential at
> this point, so if we want to put it in for
> faster detection of certain configuration problems
> then it should be put in as optional.
> 
> Anoop
> 
> > -----Original Message-----
> > From: Dinesh G Dutt [mailto:ddutt at cisco.com]
> > Sent: Tuesday, October 23, 2007 2:11 PM
> > To: Anoop Ghanwani
> > Cc: Silvano Gai; Radia Perlman; Developing a hybrid router/bridge.
> > Subject: RE: [rbridge] Final outcome of outer
> > VLANtagsonRBridge-RBridgepackets?
> >
> > Anoop,
> >
> > I spoke to David Ward, an IS-IS expert here at Cisco (and a
> > co-author on the L2 ISIS draft) and he said that it's
> > perfectly fine to use Hellos on multiple VLANs for discovery
> > and send LSP only on one VLAN, one of the common ones.
> >
> > Can we then conclude that by default we send Hellos on a set
> > of one or more configured VLANs with the set being equal to
> > the active set of VLANs on that link by default ?
> >
> > Thanks,
> >
> > Dinesh
> > On Tue, 2007-10-23 at 10:04 -0700, Anoop Ghanwani wrote:
> > > > -----Original Message-----
> > > > From: Dinesh G Dutt [mailto:ddutt at cisco.com]
> > > > Sent: Tuesday, October 23, 2007 7:21 AM
> > > > To: Silvano Gai
> > > > Cc: Anoop Ghanwani; Radia Perlman; Developing a hybrid
> > router/bridge.
> > > > Subject: Re: [rbridge] Final outcome of outer VLAN
> > > > tagsonRBridge-RBridgepackets?
> > > >
> > > > I agree that using a single VLAN solution for IS-IS DRB is weak.
> > > > However, I'm skeptical that another protocol that also just
sends
> > > > Hellos is much more scalabale or better than IS-IS sending only
> > > > Hellos on all configured VLANs.
> > >
> > > Dinesh,
> > >
> > > The key here is just sending hellos as opposed to
> > maintaining a full
> > > IS-IS adjacency on the VLAN.  As long maintaining the
> > adjancency and
> > > sending LSPs on every VLAN is not required, the protocol
> > that is used
> > > for it doesn't matter.
> > >
> > > Anoop
> > --
> > "And those who were seen dancing were thought to be insane by
> > those who could not hear the music." -- Angela Monet
> >