From: Fred Danson (fred190044@xxxxxxxxxxx)
Date: Sun Jul 01 2001 - 12:01:50 GMT-3
Hi Zeng,
The local preference for the routes coming from your EBGP neighbor is set to
100, but it doesn't show in the show ip bgp neighbor output. You can test
this by manually setting the local preference for routes coming from your
EBGP neighbor to 99. When you set this, the IBGP route should be preferred.
Fred
>From: "Zeng Puyang" Reply-To: "Zeng Puyang" To: "Lachlan Kidd" , "'Brian'"
>, Subject: Re: BGP attribute manipulation Date: Sun, 1 Jul 2001 14:35:55
>+0800
>
>hi, folks:
>
>I have a little question about best path selection, could you please help
>me out?
>
>When R1 get a route from both ebgp peer and ibgp peer with same as path,
>the route from ebgp peer have no LocPrf displayed in 'sh ip bgp', and
>LocPrf 100 from ibgp peer. Whick route should R1 choice? R1 seems always
>choice the route from ebgp, becasuse 'Prefer external (eBGP) over internal
>(iBGP) paths. ' But what about local prefference? What's the LocPrf not
>displayed?
>
>R1#sh ip bgp
>
>Network Next Hop Metric LocPrf Weight Path * i192.168.1.0 10.10.2.254 0 100
>0 4 i *> 10.10.1.254 0 0 4 i
>
>
>R2#sh ip bgp
>
>Network Next Hop Metric LocPrf Weight Path * i192.168.1.0 10.10.1.254 0 100
>0 4 i *> 10.10.2.254 0 0 4 i
>
>I read from some place that the default LocPrf is 200 in bgp, is that true?
>But when I explicitly set the LocPrf from ibgp to 101 or bigger, it is
>displayed and R1 choice the ibgp? So the LocPre from ebgp is 100 and not
>displayed? Could you please comfort me for this? R1#sh ip bgp
>
>Network Next Hop Metric LocPrf Weight Path * >i192.168.1.0 10.10.2.254 0
>101 0 4 i * 10.10.1.254 0 0 4 i
>
>Thanks a lot
>
>Zeng Puang
>
>----- Original Message ----- From: "Lachlan Kidd" To: "'Brian'" ; Sent:
>Sunday, July 01, 2001 9:22 AM Subject: RE: BGP attribute manipulation
>
>
> > Hi Brian, > Try bgp best-path compare-routerid > I've noticed that Cisco
>have updated a document on BGP the decision process > to include all of the
>recently added commands. Check out >
>http://www.cisco.com/warp/customer/459/25.shtml > HTH, > Lachlan > >
>-----Original Message----- > From: nobody@groupstudy.com
>[mailto:nobody@groupstudy.com]On Behalf Of > Brian > Sent: Sunday, 1 July
>2001 10:53:AM > To: ccielab@groupstudy.com > Subject: BGP attribute
>manipulation > > > The older way BGP would behave, at the end of the > BGP
>decision process, was to use the next-hop with > the lower router-id. > >
>cisco changed this recently I believe, I think > they made it by default
>prefer the oldest route > or something to that effect. > > Does anyone know
>the setting that has it behave > like the "old" way, where instead it does
>a router-id > comparison? I was looking around for that setting > and could
>not find it. Thanks > > Brian > > >
>----------------------------------------------- > Brian Feeny
>e:signal@shreve.net > CCNP+Voice/ATM/Security p:318.222.2638x109 > CCDP
>f:318.221.6612 > Network Administrator > ShreveNet Inc. (ASN 11881) >
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