From: Howard C. Berkowitz (hcb@xxxxxxxxxxxx)
Date: Fri Mar 08 2002 - 13:44:36 GMT-3
>Question.
>
>Why would a company want BGP?
>
>In what scenarios would it be good working policy to actually sell
>them BGP instead of advertising their netblock through
>redistribution means and giving them a default route.
>I have struggled with this question for a while and I can't really
>come up with any hard evidence to the benefits of BGP for a customer.
>
>I mean what does BGP give a customer?
First, you have to define how the customer gets its netblock. If it's
satisfactory to have a static route(s) pointing at the customer from
the ISP edge router, it can be OK. Customers should NEVER be allowed
to redistribute their routes directly into the ISP's IGP.
If they have a single connection to an ISP, usually not much. The
exception might be if they need to signal communities to the ISP for
such things as access to specific networks (e.g., research networks
with an AUP) or traffic engineering.
If they have connections to a single ISP at more than one POP, BGP
can give much more control over load sharing. OSPF can give some
control, but outbound to the ISP only.
If they connect to multiple ISPs, BGP is almost certainly necessary.
>
>Any thoughts welcome
>
>Robert McCallum CCIE #8757
>Data Network Engineer
>Ext 730 3448
>DDI : 01415663448
>Mobile : 07818002241
-- "What Problem are you trying to solve?" ***send Cisco questions to the list, so all can benefit -- not directly to me*** ******************************************************************************* * Howard C. Berkowitz hcb@gettcomm.com Chief Technology Officer, GettLab/Gett Communications Technical Director, CertificationZone.com "retired" Certified Cisco Systems Instructor (CID) #93005
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