From: Jason Gardiner (gardiner@xxxxxxxxxx)
Date: Mon Aug 27 2001 - 13:37:14 GMT-3
Guess the best way is to setup a route-map for routes outbound on the
IBGP peer setting them to a higher pref. I'll try it when I get a
chance.
Xuan.Sun@Seagate.com wrote:
>
> The interested point is:
> If you have two pathes, one is from EBGP peer, one is from IBGP peer. By
> default, BGP takes the path from EBGP peer. But if you want to use the path
> from IBGP peer, how to configure ? How to use Locale_Preference to do ? It
> is the intention in this example.
>
> If you can try in your lab, that will be great.
>
> Jason Gardiner <gardiner@sprint.net>@sprint.net on 08/27/2001 05:21:33 AM
>
> Sent by: gardiner@sprint.net
>
> To: Xuan.Sun@Seagate.com
> cc: ccielab@groupstudy.com
>
> Subject: Re: LOCAL_PREF example in Doyle, Routing TCP/IP Volume II page
> 242
>
> Hello,
>
> I'm not sure how this exactly setup, but something you said is
> interesting:
>
> >>assigns a high Local_Pref number (300) on Moritz. It send to Zermatt.
>
> Local pref is just that. Local. If you send routes to another AS, the
> local pref gets dropped.
>
> Xuan.Sun@Seagate.com wrote:
> >
> > Hi All
> >
> > I have posted a message talking about LOCAL_PREF before. I hit this
> problem
> > again when I tried the example on Dolye's book.
> >
> > The diagram and configuration are at Page 242-243. Dolye uses this
> example
> > to manipulate the LOCAL_PREFERENCE. So it will take the route to AS 50
> > using Innsbruck, AS 75 using Saalbach.
> >
> > On Zermatt, there are two paths to reach AS 75, for example the route
> > 172.18.0.0. It either takes Innsbruck or Moritz. The Innsbruck is the
> EBGP
> > peer. Moritz is the IBGP peer. Because the Innsbruck is the EBGP peer.
> BGP
> > always uses it as the next hop.
> >
> > Dolye assigns a high Local_Pref number (300) on Moritz. It send to
> Zermatt.
> > So on Zermatt, the next hop to 172.18.0.0 from Moritz increased to 300,
> > instead of the default 100. So BGP will take Moritz as the next hop for
> > 172.18.0.0. The "show ip BGP" is on Page 244.
> >
> > I have built up the same network and configuration. But it does not work
> in
> > the way as Dolye's. I can see the Locale_Pref has been changed to 300.
> But
> > BGP still takes Innsbruck. See my "show ip bgp" on Zermatt. I have
> aligned
> > the output. But it may not display on your machine.
> >
> > Have somebody tested this configuration before ? Did you have the same
> > problem ? Is it a IOS bug ? I am using 3810, IOS 12.0.(7)T for Moritz and
> > Zermatt.
> >
> > Your feedback is highly appeciated. I am tied to this Locale_Pref
> > attribute.
> >
> > Zermatt#sh ip bgp
> > BGP table version is 23, local router ID is 172.30.255.254
> > Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal
> > Origin codes: i - IGP, e - EGP, ? - incomplete
> >
> > Network Next Hop Metric LocPrf Weight
> Path
> > * i10.20.0.0/16 172.30.255.150 100 0
> 100 50 ?
> > *> 10.100.83.1 200 0
> 100 50 ?
> > * i10.30.0.0/16 172.30.255.150 0 100 0
> ?
> > *> 192.168.3.3 0 32768
> ?
> > * i10.50.250.1/32 172.30.255.150 100 0
> 100 50 ?
> > *> 10.100.83.1 200 0
> 100 50 ?
> > * i10.75.100.1/32 172.30.255.150 100 0
> 100 50 ?
> > *> 10.100.83.1 200 0
> 100 50 ?
> > *> 10.100.65.1/32 10.100.83.1 200 0
> 100 50 ?
> > *>i10.100.83.1/32 172.30.255.150 100 0
> 100 50 ?
> > * i172.16.0.0 172.30.255.150 0 100 0
> ?
> > *> 192.168.3.3 0 32768
> ?
> > * i172.17.0.0 172.30.255.150 100 0
> 100 50 ?
> > *> 10.100.83.1 200 0
> 100 50 ?
> > * i172.18.0.0 172.30.255.150 300 0
> 100 75 i
> > *> 10.100.83.1 0
> 100 75 i
> > * i172.29.1.0/24 172.30.255.150 0 100 0
> ?
> > *> 192.168.3.3 0 32768
> ?
> > * i172.29.2.0/24 172.30.255.150 100 0
> 100 50 ?
> > *> 10.100.83.1 200 0
> 100 50 ?
> > *> 172.30.255.150/32
> > 192.168.3.2 0 32768
> ?
> > * i172.31.0.0 172.30.255.150 0 100 0 ?
> > *> 192.168.3.3 0 32768
> ?
> > * i192.168.50.0 172.30.255.150 100 0
> 100 50 ?
> > *> 10.100.83.1 200 0
> 100 50 ?
> > * i192.168.100.0 172.30.255.150 0 100 0
> ?
> > *> 192.168.3.3 0 32768
> ?
> > **Please read:http://www.groupstudy.com/list/posting.html
> --
> Thanks,
>
> Jason Gardiner
> Supervisor, Engineering Services
> Sprint E|Solutions
>
> "You can swim all day in the Sea of Knowledge and
> still come out completely dry. Most people do."
>
> - Norton Juster
-- Thanks,Jason Gardiner Supervisor, Engineering Services Sprint E|Solutions
"You can swim all day in the Sea of Knowledge and still come out completely dry. Most people do."
- Norton Juster **Please read:http://www.groupstudy.com/list/posting.html
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