[c-nsp] Using L3 switches as CPE

[Arie Vayner (avayner)]

Steve,

One thing to be careful with switches in Ethernet circuits is sub-rate
link QOS.
If the circuit you get/provide is an Ethernet link but the end to end
service is a lower rate (for example 300Mbps service over 1G etc), then
you need to apply egress shaping on the CPE before forwarding packets to
the link, or else you would get drops due to policing performed along
the line. This would drop packets randomly and would not allow you to
provide QOS policies etc.

For this kind of deployments (where shaping is needed) you would most
likely need a router as a CPE, but can also take a look at the ME-3400
switch, which has these capabilities and is positioned as a MetroE
CPE...

Arie

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Steve Bertrand
Sent: Thursday, March 25, 2010 15:59
To: Cisco-NSP Mailing List
Subject: [c-nsp] Using L3 switches as CPE

Hi all,

I'm going to be deploying some old 3550's as CPE on a
Fibre-over-Ethernet network. I've never used a layer-3 switch for this
job before, I've always used a router with a separate switch. I'm
looking for some advice, as the setup is a bit different from what I'm
used to.

What I think I have to do is this:

- trunk vlan 768 through gi0/1 back to my PE router
- configure an int vlan768 to contain the /30 ptp IP
- configure a second vlan (eg: 5) and apply one of the client's IP
addresses on it (which will act as their default gw)
- configure the fa interfaces as access ports for vlan 5
- enable ip-routing
- set up BGP as usual, using int vlan768 as the update-source

Does this sound right? Can anyone offer any other advice regarding this
setup, particularly any config techniques that I should know about for
this type of deployment?

Steve
_______________________________________________
cisco-nsp mailing list  cisco-nsp at puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at http://puck.nether.net/pipermail/cisco-nsp/