Solved

%CLNS-3-BADPACKET: ISIS: LAN L1 hello, Duplicate system ID

Posted on 2004-10-04
4
2,160 Views
Last Modified: 2010-08-05
We get an error "%CLNS-3-BADPACKET: ISIS: LAN L1 hello, Duplicate system ID" on each of our 2 6500 switches running ISIS.  The system ID's have been checked and are fine.  A 802.1q trunk connects the two switches.  We get the error every 60 seconds for 7-8 minutes in a row about every 2-3 hours.

There is no information on this error on Cisco's website.  MTU size is fine on each switch.
0
Comment
Question by:davidhvoss
4 Comments
 
LVL 43

Accepted Solution

by:
JFrederick29 earned 500 total points
ID: 12225644
It means that one of your Level 1 routers have the same system ID in their SNPA address.  You are sure the system ID portion of the NET is not the same on both routers?  You don't have any other devices running IS-IS on your network?

Router 1:

router isis
net 49.0001.0000.0c12.3456.00  <---0000.0c12.3456 portion needs to be unique.

Router 2:

router isis
net 49.0001.0000.0c12.3457.00  <---0000.0c12.3457 portion needs to be unique.
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Cable Modem Provisioning from DPoE compliant server  This Article is to support CMTS administrators to provide an overview of DOCSIS compliance configuration file, and to provision a cable modem located at customer place from a Back office serve…
Sometimes you have to pull out old tricks to get a new firewall to work… While we were installing a new Sonicwall at a customers site we found that sites they were able to visit before were not working.  It seemed random and we could not understa…
In a recent question (https://www.experts-exchange.com/questions/28997919/Pagination-in-Adobe-Acrobat.html) here at Experts Exchange, a member asked how to add page numbers to a PDF file using Adobe Acrobat XI Pro. This short video Micro Tutorial sh…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

773 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question