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

[Bruce Pinsky]

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Robert Blayzor wrote:
> Frank Bulk wrote:
>> I'm looking to share an internet pipe with several other regional ISPs.  We
>> will be receiving our internet pipe via a Cisco 2950 into our Fujitsu 4500
>> shelf to transport it around our regional ring.  But the way the Fuji
>> equipment drops off each ISP's traffic on this RPR-Ethernet pipe has to be
>> on a per-VLAN basis.  So all the traffic *has* to be tagged.
> 
> Are you sure this is true? "has to be tagged"?  RPR is just packet, you
> choose whether you route or bridge over it.  Why can't you just place
> the participating ISP's router interfaces in a common subnet and let the
> ISP's on each side route?  That way you could even exchange routes with
> the ISP's on the same RPR without forcing it to go through the
> upstreams. (should you choose to do so)  This should allow everyone on
> the ring to share the max bandwidth to the upstream....
> 


I'm reading between the lines a bit, but I think that he is saying that the
 Fujitsu has the ability to deliver the tagged packet to the proper ISP
router based on the .1q tag.  If this is the case, I think it offloads each
of the ISP routers from having to look at the MAC address to determine if
they need to accept it or not.

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bep

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