[afnog] Bridged Access Network

[Mark Tinka]

On Wednesday, October 09, 2013 10:55:31 AM Phil Regnauld 
wrote:

>     Now, if the customer wants to have inter-site L2, you
> need to look at technologies like L2 tunneling, I've
> done this in the past with point-to-point GRE tunnels
> bridged with LANs. Depending on the size and complexity,
> you may have to look at solutions such as QinQ tunneling
> and maybe even MPLS - I'll leave this up to the adults
> on this list :)

It's sad that the Broadband boys are doing much better than 
us (IP/Ethernet folk) at our own game.

If you look at DSLAM or GPON access nodes, customers can 
share the same address space but be separated at the Layer 2 
level. TR-156 from the Broadband Forum for those who are 
interested.

So customers can live on the same VLAN (or Layer 2 broadcast 
domain), but not have Layer 2 visibility of one another, yet 
still sitting on the same IP space. The customers can 
definitely still communicate to each other at Layer 3, but 
this is what we want anyway.

The corollary in our world is Private VLAN's, if your 
Ethernet switch supports that.

Cheers,

Mark.
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