[c-nsp] Assigning VLANs on a per-subnet basis

[Bruce Pinsky]

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Michael K. Smith wrote:
> Hi Frank:
> 
> It seems that the most efficient way to approach the issue given the
> constraints of your provider and of your RPR config on the back end would be
> to do the Layer 3 mid point between your provider and each of you.  Make the
> uplink a /30 and then terminate each of the customer subnets on the device
> and carry those on individual VLAN's across the ring.
> 
> I'm thinking you could use a mid-size L3 Switch like a 3650 or 3750 with the
> Enhanced software and have VLAN interfaces for each subnet.
> 

Agreed.  That's what I started to write the first time before I suggested
the simpler "bridge only"/"exchange LAN" topology not knowing the constraints.

I can't think of any way to put .1Q tags on packets that come in untagged
without directing/switching them onto .1Q VLANs at layer 3.  I don't
believe there is a mechanism at layer 2 to inspect packets and tag them
based on arbitrary criteria (like source or destination address).

At layer 2 only, Q in Q termination would be your best bet but I can't say
if your provider can provide Q in Q tagging and also rate limit on the
aggregate, double-tagged traffic.

- --
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bep

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