[rbridge] Proposal to make VLAN mapping work

[Dinesh G Dutt]

Radia Perlman wrote:
> I think I understand what Caitlin is saying, and let me say it in 
> different words.
> What Caitlin is saying: Avoid VLAN mapping entirely by just
> renumbering the VLAN that needs to change.
I understood the same. That's unfortunately not always the choice,
> So I think our options are:
> a) explicitly not support VLAN mapping. Declare it a misconfiguration 
> if it is detected, and
> make the network owner renumber things so no VLAN mapping is 
> occurring. (this is
> how the current spec reads)
> b) allow for support by changing the spec to include information in 
> IS-IS Hellos
> to alert the DRB that VLAN mapping is going on.
>
> So, anyway...I recommend we do "b", namely alert the DRB that VLAN
> mapping is going on, and have the DRB make sure there is only one
> forwarder for any mapped VLANs, and don't say anything else in the
> spec about VLAN mapping. That way there are sufficient hooks so
> that someone can implement VLAN mapping if they want.
That is fine by me. That is why I believe you suggested documenting the 
other changes in a separate draft.

Dinesh

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