RE: bgp 2 isp question

You can if you want. But you don't have to. Once one path is one as longer
than the other you are good to go.

Regards,

Tyson Scott - CCIE #13513 R&S, Security, and SP

Managing Partner / Sr. Instructor - IPexpert, Inc.

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From: Fake Name [mailto:fname84_at_gmail.com]
Sent: Tuesday, August 31, 2010 2:41 PM
To: Tyson Scott
Cc: Cisco certification
Subject: Re: bgp 2 isp question

Ah so theres no set number to make sure like append the as 15 times on it?

On Tue, Aug 31, 2010 at 2:21 PM, Tyson Scott <tscott_at_ipexpert.com> wrote:

1 more than the longest path. You should go out on some Looking glass
websites and see what the path shows on the internet.

Regards,

Tyson Scott - CCIE #13513 R&S, Security, and SP

Managing Partner / Sr. Instructor - IPexpert, Inc.

Mailto: tscott_at_ipexpert.com

From: Fake Name [mailto:fname84_at_gmail.com]
Sent: Tuesday, August 31, 2010 1:53 PM
To: Tyson Scott
Cc: Cisco certification
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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Received on Tue Aug 31 2010 - 15:04:12 ART