[rbak-nsp] BGP next hop as route server IP

[Marcin Kuczera]

Jeff Tantsura wrote:
> Hi,
> 
> Is this issue only reproducible with 6.2.1.4?
> What does "sometimes" mean, is there some condition to provoke this?
> Have you tried to debug?

Well, this happend about 2-3 times in a living environment on both 
6.2.1.4 and 6.1.3.6 (before upgrade).
So, what I had to do is to restore proper operation ASAP - no time for 
deeper debug.

But - I'll try to find out some scenarion to provoke it, I'll let you know.

> Are you sure the RS "sometimes" doesn't rewrite NH to itself?

Yes, I'am sure, this we could check with RS administrator.

> How does your config look like?

Will send you some config later.

Regards,
Marcin



> Cheers,
> Jeff
> 
> On Wed, Oct 20, 2010 at 2:20 AM, Marcin Kuczera <marcin at leon.pl 
> <mailto:marcin at leon.pl>> wrote:
> 
>     hello,
> 
>     we are having recently problems with connection to RouteServers.
>     Well, RS'es are configured to add their AS as first in path, so
>     connection is possible.
> 
>     However, sometimes it happens, that all next hops are set as
>     RouteServer IP addresses (and so traffic is dropped by RS).
> 
>     It happens more often, when we have iBGP between 2 SE100, and both
>     SE100 are connected paralelly to the same route-servers (via the
>     same VLAN, but different IP addresses from the same /23 network).
> 
>     If there are some problems with RSes, or one of sessions goes down -
>     SE100 with 6.2.1.4 locks next hop as RS address.
>     SoftClear, clear, whatever - doesn't help.
>     Restart of bgp process, rib process - also, no result.
> 
>     The only solution is to remove IP address from IX interface (PLIX),
>     clear BGP sessions (with 2 RSes, on both the same problem same time).
>     Then add this IP back to PLIX interface and commit.
> 
>     (and in meantime, SEOS sends some ARP requests from other VLANs to
>     PLIX vlan !?!?)
> 
> 
> 
>     Is it a bug or there is some condition at which it is possible to
>     replace proper next-hop with RS IP ?
> 
>     (RSes advertise proper next-hop addresses)
> 
>     Regards,
>     Marcin
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