From: Zeng Puyang (zbridge98@xxxxxxxxx)
Date: Sun Jul 01 2001 - 03:35:55 GMT-3
hi, folks:
I have a little question about best path selection, could you please help me ou
t?
When R1 get a route from both ebgp peer and ibgp peer with same as path, the ro
ute 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? Bu
t 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" <lkidd@netstarnetworks.com>
To: "'Brian'" <signal@shreve.net>; <ccielab@groupstudy.com>
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)
> **Please read:http://www.groupstudy.com/list/posting.html
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