[c-nsp] Using L3 switches as CPE

[David Prall]

> 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

Just set the port as an access port. No need to trunk.


> - configure an int vlan768 to contain the /30 ptp IP

Correct

> - configure a second vlan (eg: 5) and apply one of the client's IP
> addresses on it (which will act as their default gw)

Correct

> - 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

Shouldn't have to explicitly configure this.

> 
> 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?
> 

As long as the GigE port is line rate you shouldn't have any issues. If you
are providing a subrate service, then they really need something with HQoS
so that they can send what they want, and not let you randomly drop what
they send.

> Steve
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