From: Justin Cook (Justin.Cook@computerland.co.nz)
Date: Sun Sep 29 2002 - 19:05:19 GMT-3
The following is the scenario
You and another company connect via BGP through a Provider (diff or same
does not matter) you also have a backup link between your AS's (you and
customer)
AS100--------------------------AS200
+ +
+ +
AS1(Customer)-------------AS2(You)
I noticed when reading Cisco Press Internet Routing Architectures that they
seem to use the following two commands alot
1. Neighbor CUSTOMER next-hop-self
And
2. Neighbor ISPAS200 filter-list 10 out
Ip as-path access-list 10 permit ^$
I know that 1. is used so that the customer router knows that the next hop
is your router for routes learned from the ISP as you do not use an IGP
between yourself and the ISP
And that 2. is used to stop the backup link between you and you customer
being used as a bridge
But is there any other reason the impression I got from the book is this is
a standard configuration and used widely is this the case.
Also please comment if my statements above do not ring true
Thanks
-- Justin Cook
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