From: Jim Devane (jdevane@nevadanap.com)
Date: Fri Feb 10 2006 - 03:47:59 GMT-3
Some large companies only need a default route as well. = )
A couple instances where BGP would be less than a full table:
1) You are only buying partial routes (paid peering) Perhaps you can
negotiate a better price ( perhaps even settlement free if enough
traffic is exchanged) between you and another network. You will filter
routes so that you are not using them to get to destinations other than
them directly and vice versa.
2) You are in a colo and connect to a SP. You may not have your own ASN
and have greater than a /24 allocated to you. Perhaps your corporate
policy, or perhaps it is just offered to have a second link for
redundancy. You can use BGP to push the subnets to your provider. You
don't need a full table, in fact, inbound you will likely only have a
default, but you will need BGP to advertise the subnets out.
Hth,
Jim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
CCIEin2006
Sent: Thursday, February 09, 2006 6:40 PM
To: ccie lab
Subject: BGP in the real world
Hello group,
I was wondering what was the most common way companies route with their
internet service providers.
I know small companies just default route to their ISP and don't even
need BGP.
As for medium and large companies they may receive default via BGP and
possible leak in some routes.
What would be some scenarios where a company would need to allow some
BGP routes in from the ISP without receiving the entire routing table?
This archive was generated by hypermail 2.1.4 : Wed Mar 01 2006 - 11:28:17 GMT-3