Re: bgp 2 isp question

In the real world, you would start with about 3 prepends and add one at a
time until you get the desired result. Once you get what you need, you would
maybe add another for good measure. This method has been proven to be quite
successful for me over the last 12 years in the Service Provider
Environment. Just my experience and 2 cents worth. :-)

-- 
Paul Negron
CCIE# 14856 CCSI# 22752
Senior Technical Instructor
www.micronicstraining.com
> From: Fake Name <fname84_at_gmail.com>
> Reply-To: Fake Name <fname84_at_gmail.com>
> Date: Tue, 31 Aug 2010 13:53:22 -0400
> To: Tyson Scott <tscott_at_ipexpert.com>
> Cc: Cisco certification <ccielab_at_groupstudy.com>
> Subject: Re: bgp 2 isp question
> 
> Tyson
> 
> Thanks for the response.  Let me ask you in the real world how many times
> would you prepend your as onto it to make it less perfered?
> 
> 
> 
> 
> On Tue, Aug 31, 2010 at 12:26 PM, Tyson Scott <tscott_at_ipexpert.com> wrote:
> 
>> Yes that will work or you can use path prepending to make the AS-PATH
>> shorter for the one you want.  Both are typical scenario's used on the
>> internet.
>> 
>> Regards,
>> 
>> Tyson Scott - CCIE #13513 R&S, Security, and SP
>> Managing Partner / Sr. Instructor - IPexpert, Inc.
>> Mailto: tscott_at_ipexpert.com
>> 
>> 
>> 
>> -----Original Message-----
>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> Fake
>> Name
>> Sent: Tuesday, August 31, 2010 12:06 PM
>> To: Cisco certification
>> Subject: bgp 2 isp question
>> 
>> If i have a /23 block and I have two isps and 2 different routers.  I want
>> to perfer traffic to come into 1 router for the block opposed to the other.
>> From what I understand /24 is the highest mask that wont be summarized.
>> 
>> All traffic should come into router1 untill it is down then traffic will
>> come into router 2 because they have more specific routes correct?
>> 
>> 
>> Router1 most perfered
>> ip route x.x.x.x x.x.x.x (next hop) 0
>> ip route x.x.x.x x.x.x.x (next hop) 0
>> router bgp x
>> network x.x.xx.x 255.255.255.0
>> network x.x.x.x 255.255.255.0
>> 
>> Router2 less perfered
>> ip route x.x.x.x 255.255.254.0 (next hop) 0
>> router bgp x
>> network x.x.x.x 255.255.254.0
>> 
>> 
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