Designing ISP POP - pointers ?

Hi,
I come from enterprise world and haven't had much experience in ISP world.
Now, I am interested in good design of ISP POPs, when using MPLS
functionality, dialin access, ADSL access.
I haven't found some detailed schemes of good layout design of ISP POPs on
Cisco site. There are lot of partial documents that only touch some part,
but never in more detail and alltogether.
There are lot of questions that come to mind ...
How to separate different access roles (vlans, P-t-p links etc). Should I
use BGP on all routers or maybe only on routers peering with other ISPs BGP
routers, is is clever to user L3 functionality on catalyst switch if it L3,
or use it as L2 device and leave all L3 functionality to 7200s.
Are there any good pictures, schemes, design guides for ISP POPs.

thanks a lot,
ghoe

ghoe

ghoe wrote:
> Hi,
> I come from enterprise world and haven't had much experience in ISP world.
> Now, I am interested in good design of ISP POPs, when using MPLS
> functionality, dialin access, ADSL access.
> I haven't found some detailed schemes of good layout design of ISP POPs on
> Cisco site. There are lot of partial documents that only touch some part,
> but never in more detail and alltogether.
this comes with experience
> There are lot of questions that come to mind ...
> How to separate different access roles (vlans, P-t-p links etc). Should I
> use BGP on all routers or maybe only on routers peering with other ISPs BGP
> routers,
try using BPG only on your border routers and have the 3550 configured
as a BGP route-reflector client
is is clever to user L3 functionality on catalyst switch if it L3,
> or use it as L2 device and leave all L3 functionality to 7200s.
where I worke we use 3550 for metro routing leaving the 7200s for
backbone traffic.
> Are there any good pictures, schemes, design guides for ISP POPs.
as a said it's about practical experience. try reading some design
guidlines from cisco site. the enterprise model is a good start.
>
> thanks a lot,
> ghoe
>
>