From: Fred Danson (fred190044@xxxxxxxxxxx)
Date: Mon Aug 27 2001 - 10:26:52 GMT-3
Xuan,
Would you mind posting the configs of Innsbruck, Zermatt, and Mortiz? Also,
could you make sure that Zermatt is capable of pinging the RIDs of Innsbruck
and Mortiz?
Fred
>From: Xuan.Sun@Seagate.com
>Reply-To: Xuan.Sun@Seagate.com
>To: ccielab@groupstudy.com
>Subject: LOCAL_PREF example in Doyle, Routing TCP/IP Volume II page 242
>Date: Sun, 26 Aug 2001 20:13:30 -0700
>
>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
>?
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