From: Kenan Tahsin Hersan (tahsin@equant.com.tr)
Date: Tue Sep 07 2004 - 11:15:57 GMT-3
Hi Bob,
As you addressed, I checked and saw that i have an STP loop!
I think because of loop, R2 was getting its own Hellos back.. :P
Thanks,
Tahsin
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Bob Sinclair
Sent: Sal}, Eyl|l 07, 2004 15:02
To: Kenan Tahsin Hersan; ccielab@groupstudy.com
Subject: Re: IS-IS Strange Problem
Hi Tahsin,
This issue has popped up on Groupstudy a couple times over the past year,
without resolution. I have also seen it come up in class, where a reboot
usually fixes the problem. This could be a bug, but make sure you have not
created an STP loop with a misconfigured EtherChannel. Try connecting the
two routers with a crossover to rule out any switching issues.
HTH,
Bob Sinclair
CCIE #10427, CISSP, MCSE
www.netmasterclass.net
----- Original Message -----
From: "Kenan Tahsin Hersan" <tahsin@equant.com.tr>
To: <ccielab@groupstudy.com>
Sent: Tuesday, September 07, 2004 2:23 AM
Subject: IS-IS Strange Problem
> Hi Group,
>
> Does anyone experienced this error before?
>
> %CLNS-3-BADPACKET: ISIS: LAN L1 hello, Duplicate system ID detected from
> 00d0.bc76.e420 (FastEthernet0/0)
>
> I enabled ISIS on ethernet interface and keep getting this error
> periodically. That mac address is the routers itself.
>
> R2#sh arp
> Protocol Address Age (min) Hardware Addr Type Interface
> Internet 172.16.1.2 - 00d0.bc76.e420 ARPA
FastEthernet0/0
> Internet 172.16.1.1 157 0002.fda2.f282 ARPA
FastEthernet0/0
>
> R1:
> int fas 0/0
> ip address 172.16.1.1 255.255.255.0
> ip router isis
> !
> router isis
> net 49.0001.0001.0001.0001.00
> is-type level-1
>
>
> R2:
> int fas 0/0
> ip address 172.16.1.2 255.255.255.0
> ip router isis
> !
> router isis
> net 49.0001.0002.0002.0002.00
> is-type level-1
>
> Best Regards,
> Tahsin
>
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