[c-nsp] FTTH access switch

[Mikael Abrahamsson]

On Thu, 2 Dec 2010, Dan Armstrong wrote:

> ... And while were on the topic of ftth, are people tunneling from the 
> cpe to an lns, or statically allocating a vlan per customer?

Neither.

What you do is L2 isolation (and have L3 device to local-proxy-arp) or 
have the L2 switches do L2.5 filtering based on DHCP snooping.

For instance:

<http://www.cisco.com/en/US/tech/tk389/tk814/tk841/tsd_technology_support_sub-protocol_home.html>
<http://www.cisco.com/en/US/tech/tk389/tk814/tk840/tsd_technology_support_sub-protocol_home.html>

This also means you don't need a CPE, the customer can hook up their PC 
directly to the media converter (or in the ETTH+CAT6 case, directly to the 
CAT6 cable).

This has been done for 10 years in some markets. Remember people, every 
time you say LNS or BRAS when you basically just need decent L3 switch 
(because you don't need to tunnel), god kills a kitten.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se