From: curtis staller (curtisstaller@xxxxxxxxxxx)
Date: Sun Apr 29 2001 - 03:16:41 GMT-3
Murali,
The only certain way to get this type of info is to actually work for
such a provider. The only documentation that I have found focuses on the
basics i.e. the size of your route tables and different methods of
scaling IGP/BGP. It is important to understand the telco side of the
industry. Basically telcos have a network of SM fiber, whether that
fiber is an OC12 or OC192 backbone depends only on the electronics that
connect these devices. These backbones also carry phone traffic etc.
Typically a tier 1 provider will have a core and edge topology that is
integrated into this backbone. As far as architecture is concerned it is
important to understand how these NSPs bill each other "the
settlements". Basically there are 2 types of customers, the end user who
asks for a T1 or DS3 and the other CLECS and backbone providers.
Basically a tier 1 provider peers with other backbone providers and is
billed when their customers go out that peering point and vice versa.
Basically this is figured bit by bit. With this in mind you find ways
to make your routing policy as cost effective as you can. For instance,
u are a service provider that peers with 5 backbones. When u have
traffic that needs to go towards that backbone or that provider's
customers you will always send it to that provider etc. These types of
routing policies are best implemented with RFC 1998, the communities
attribute. I have attached a lab that I did last week that is a very
good example of how this works. For the brave only, there are about 30
pgs of configs mostly route maps..... >From: "Murali Raju" >Reply-To:
"Murali Raju" >To: ccielab@groupstudy.com >Subject: OT: NSP/ISP Design
>Date: Sat, 28 Apr 2001 09:27:09 -0400 > >Hi Group, >Apart from Halabi,
does anyone know of a good source for NSP/ISP >Design. I >am looking for
information (good practices) on both Layer 2 and >Routing >Architectures
(IGPs and BGP) for a Tier 1 NSP/ISP infrastructure. I >am >looking for
real life configs primarily on Cisco, but any other >vendor is >fine with
me. Thanks in advance for your help. > >Murali. > >- >Murali Raju, CCNP
>Sr.Network Engineer >VIS, Inc >
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