From: Anthony Bonilla (anthonybonilla.ccie@gmail.com)
Date: Thu Mar 15 2007 - 23:35:11 ART
Ricky,
Would it be possible for you to share your routing table and configs with
us? First thing I would like to confirm is that if you have a valid route
to your next hop IP address within AS200 for the router(s) advertising host
routes from AS100 - can you confirm that? Secondly, how are you advertising
/23 network to AS300 - do you have a static route or something because just
by using a network statement should not aggregate host routes to a /23
network?
HTH,
Tony
On 3/15/07, Au, Ricky [CCC-OT_IT] <ricky.au@citigroup.com> wrote:
>
> 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.
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> >
> > -----Original Message-----
> > From: 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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