[afnog] Bridged Access Network

[Mark Tinka]

On Wednesday, October 09, 2013 02:06:36 PM Randy Bush wrote:

> and with vlans, you can make spaghetti without using
> wires!
> 
> layer two does not scale

Private VLAN's or MAC-layer separation without the usually 
added IP complexity (i.e., a subnet per VLAN) is what helps 
scale broadband deployments, provided your access equipment 
supports it. So you can end up with one VLAN for all 
customer terminations on an aggregation device, and not 
worry about them nuking each other or your access network at 
the Ethernet Layer.

For non-broadband deployments (i.e., Metro-E and friends), 
this is probably the only other place/time where I'd openly 
suggest, on a mailing list, to deploy MPLS (in the Access) 
so you don't have to deal with Spanning Tree that is typical 
of Layer Metro-E networks. But this comes at a cost, either 
in terms of money to deploy, or time to re-design existing 
topologies - and in most cases, both.

Mark.
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