IS-IS Strange Problem

From: Kenan Tahsin Hersan (tahsin@equant.com.tr)
Date: Tue Sep 07 2004 - 03:23:11 GMT-3

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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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