[c-nsp] Customers requesting Layer 2 across our network

[Rick Kunkel]

Hello all.  I'm with a company offering colocation services in the 
seattle area.  Typically, we provide our bandwidth to customers, but 
I've had a rash of customers lately asking for connections directly to 
certain providers in the Westin.  We are connected to the Westin via our 
IP network, but I'm stuck trying to come up with the best way to get layer 
2 from another carrier to our customer.

Here's a simplified diagram showing the links, etc. between customer and 
the outside the way we currently have it.  Apologies to those with 
variable-width fonts... ;)

     Customer
         |
    Our Switch (port is assigned VLAN)
         |
         | (802.1q trunk)
         |
         + <--- customer gateway IP address
    Our Router
         + <--- x.x.x.1/30 address
         |
         | (WAN Fiber Link)
         |
         + <--- x.x.x.2/30 address
    Our Router
         |
     Carrier

In this current situation, what's the best (if any) method for a customer 
to get a connection "directly" from the carrier, where the customer gets 
an IP address from them in the classic /30 kind of way?  I can change our 
network, but probably not in vast overarching ways.

I've got some ideas but I'm purposefully leaving the question a little 
open-ended.  I know my description is a little sparse, but I'm trying to 
not give you too many details to complicate the fundamental question.

Thanks in advance!

--Rick