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List:       zebra
Subject:    [zebra 5931] Re: bgp route problem
From:       Jawaid.Bazyar () foreThought ! net
Date:       2000-11-30 16:12:37
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I am also seeing this. My configuration is as follows:

Linux cacheflow.forethought.net 2.4.0-test10 #6 SMP Fri Nov 17 01:29:26
MST 2000 i686 unknown

upstream peer (as 5696) <-> zebra (as 6653) <-> cisco 3662 (as 6653)

I have numerous instances of "double" routes. An example:

9.186.144.0     209.140.6.33    255.255.240.0   UG    0      0        0
atm1
9.186.144.0     216.241.35.105  255.255.240.0   UG    0      0        0
atm0

Needless to say, this is causing routing loops. Right now I am
periodically killing the BGP sessions and re-starting them.

There is a second issue related to this: sometimes when I stop a BGP
session, the routes are not deleted from the kernel routing table, and I
have to reboot to clear it. Does anyone know of an easy way to clear out
the kernel routing table on linux without rebooting?


On Wed, 29 Nov 2000, W Christopher Martin wrote:

> Kunihiro Ishiguro writes:
> > I committed part of the new RIB code, but not yet finished.  Please
> > wait little bit more.
> 
> Will this fix a problem I've seen with recent CVS versions where
> all BGP routes get into the RIB, not just the best one?
> 
> Specifically, with multiple peers, zebra is adding routes with
> correct nexthop to each even though internally (as seen with
> "show ip route"), it only shows the current best path.  I suspect
> it is neglecting to delete previous route when a new best one
> is chosen.
> 
> This is especially nasty with multiple iBGP peers because they
> can end up routing to each other (i.e. a routing loop).
> 
> A wild guess as to when this started happening is when some changes
> to support multipath OSPF routes were done.  I could be wrong.

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