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Utilization of CPU of AR28-80 Is very High Because SQL Server 2000 Server Is not Installed with Patch

Publication Date:  2012-07-27  |   Views:  129  |   Downloads:  0  |   Author:  Chu Shaowei  |   Document ID:  EKB0000138992

Contents
Issue Description Alarm Information Handling Process Root Cause Suggestions

Issue Description

AR28-80 is attached with S3026 and S6503 which are for access of users. When problem occurs, user services do not communicate; log into AR28-80, and type the command, but the equipment respond very slowly. 

Alarm Information

Execute dis cpu command to check the CPU utilization of VSIF process, and it reaches 98%. 

Handling Process

1. Shut down the equipment connecting to ports of AR28-80 one by one. Once S3026 is shut, services recover. So it is made sure that the network segment connecting with S3026 fails. 
2. According to checkup for ports of S3026, there is little broadcast packet, so the problem is not arising from L2 loop. 
3. A great deal of multicast packets are found at three ports. Mirror one of the port, and a great deal of multicast packets are found, with destination port as 1434. Terminals under the three ports are installed with SQL Server 2000. Check the specific version of SQL Server 2000, and SQL Server 2000 is not installed with patch. 
4. Disable port 1434 at AR28-80, and install the latest patch for SQL Server 2000, solving the problem. 

Root Cause

The possible reasons include: 
1. Loop. 
2. Attack. 
3. Virus. 

Suggestions

For equipment at access layer that supports ACL, it should be configured with ACL against virus. 
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