[160376] in North American Network Operators' Group
Re: Muni fiber: L1 or L2?
daemon@ATHENA.MIT.EDU (Owen DeLong)
Mon Feb 4 18:55:04 2013
From: Owen DeLong <owen@delong.com>
In-Reply-To: <5110256F.6000009@vaxination.ca>
Date: Mon, 4 Feb 2013 15:34:33 -0800
To: Jean-Francois Mezei <jfmezei_nanog@vaxination.ca>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Feb 4, 2013, at 13:17 , Jean-Francois Mezei =
<jfmezei_nanog@vaxination.ca> wrote:
> On 13-02-04 16:04, Scott Helms wrote:
>=20
>> Subscribers don't care if the hand off is at layer 1 or layer 2 so =
this is
>> moot as well.
>=20
> This is where one has to be carefull. The wholesale scenario in =
Canada
> leaves indepdendant ISPs having to explain to their customers that =
they
> can't fix certain problems and that they must call the telco/cableco =
to
> get it fixed. (in the case of a certain cable company, they can't even
> call them, it has to be done by email with response of at least 48 =
hours).
>=20
> So splitting responsabilities can be an annoyance if it becomes very
> visible to the end users.
>=20
> Another aspect: customers espect to be able to switch seamlessly from
> one ISP to the next. But ISP-2 can't take over from ISP-1 until ISP-1
> has relinquised control over the line to the end user. In a layer 1
> scenario, it means ISP-1 has to physically go and deinstall their CPE
> and disconnect strand from their OLT, and then ISP-2 can do the =
reverse
> and reconnect evrything to provide services.
>=20
Only if you insist on re-using the same strand. More likely in the =
proposed
scenario, the customer is only using 1 of the 3 pairs of fiber to their =
prem.
In such a case, just light the second strand with ISP-2 and ISP-1 can
do their de-install at their leisure (or not).
> What happens when ISP-1 isn't interested in a quick disconnect and =
ISP-2
> has to wait days/weeks with end use without service ?
Nope. See above.
>=20
>=20
> In a layer2 service, it is a matter of reconfiguring the OLT to pass
> ethernet packets to a different VLAN to a different ISP. No physical
> changes required and it can be almost tranparent to the end user who
> just has to make a new DHCP request and be provisioned by ISP-2.
>=20
I agree this can be an advantage in some scenarios. That's one of the
reasons I think allowing the muni to provide optional L2 aggregation
services is worth while.
Owen
