From: Au, Ricky [CCC-OT_IT] (ricky.au@citigroup.com)
Date: Thu Mar 15 2007 - 22:48:35 ART
Dear all,
It is happened in a real case. I show ip bgp for the host route /32. It
says that there are 4 available paths but no best path. Why?
Paths: (4 available, no best path)
Multipath: eBGP
Not advertised to any peer
Regards,
Ricky Au
Network Engineering
Citigroup Architecture & Technology Engineering (CATE)
Address: Citigroup Global Markets Asia Pacific 15/F, 3 Exchange Square
Central, Hong Kong, China
Email: ricky.au@citigroup.com
Office: +852-3551-5542
Fax: +852-3551-5182
_____
From: Anthony Bonilla [mailto:anthonybonilla.ccie@gmail.com]
Sent: Friday, March 16, 2007 4:36 AM
To: Brian McGahan
Cc: Ming Ki Au; Cisco certification; Au, Ricky [CCC-OT_IT]
Subject: Re: route advertise in BGP
Brian,
To me, it sounded like a concept type question - it did not seem to be
that Ming has a real setup that he is working with. I would say you
would advertise both host routes and /23 out to your eBGP peer if the
routes are valid and also you need to ensure that there is a
corresponding /23 network in your IGP before you can advertise it via
BGP using a network statement being that the router will not summarize
the two host routes automatically.
HTH
Tony
On 3/15/07, Brian McGahan <bmcgahan@internetworkexpert.com> wrote:
Assuming the host routes aren't being manually filtered they
should be
passed on. Look at the "show ip bgp 192.168.10.91
255.255.255.255"
output and see what it says about it being advertised. Also are
you
sure that these host routes are best routes?
HTH,
Brian McGahan, CCIE #8593 (R&S/SP)
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
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-----Original Message-----
From: nobody@groupstudy.com [mailto: nobody@groupstudy.com
<mailto:nobody@groupstudy.com> ] On Behalf Of
Ming Ki Au
Sent: Thursday, March 15, 2007 11:22 AM
To: Cisco certification
Cc: ricky.au@citigroup.com
Subject: route advertise in BGP
Dear all,
I have a question on BGP, can anyone help?
A router running BGP AS 200 is receiving from its ebgp peers (AS
100)
with 2
host routes. 192.168.10.91/32 and 192.168.10.92/32.
Then it advertise another route using the network command with
the
followings.
router bgp 200
network 192.168.10.0 mask 255.255.254.0
What routes will be distributed to another eBGP peer (AS 300)? I
found
that
only a single route 192.168.10.0/23 which is originated from AS
200 is
advertised to AS 300, is it correct?
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