G/C/B/A-Series f/w 6.61.08.0013 may have High CPU Utilization in the SNTP Task

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Article ID: 14560 

Products
G-Series, firmware 6.61.02.0007 through 6.61.08.0013
C5-Series; firmware 6.61.02.0007 through 6.61.08.0013, 6.61.07.0010 through 6.71.02.0008
C3-Series, firmware 6.61.02.0007 through 6.61.08.0013
B5-Series; firmware 6.61.02.0007 through 6.61.08.0013, 6.61.07.0010 through 6.71.02.0008
A4-Series; firmware 6.61.02.0007 through 6.61.08.0013, 6.61.07.0010 through 6.71.02.0008 

Changes
Created a SNTP management interface (5573) for a VLAN interface that is not operational.
Example: 'set sntp interface vlan 4' 

Symptoms
Output of 'show system utilization' indicates a high CPU utilization percentage for the "SNTP" task. 

Cause
The SNTP task is attempting communication on a VLAN interface that is not operationally up. This causes the process to hang, which increases CPU utilization. 

Solution/Workaround
Upgrade to 6.61 firmware 6.61.09.0012 or higher. 
Release notes state, in the 'Changes and Enhancements in 6.61.09.0012' section:
18000   Addressed high CPU utilization resulting from shutting down a routed SNTP interface.

Also fixed in C5/B5/A4 firmware 6.71.03.0025 or higher (though not stated in release notes). 

Pre-upgrade workaround:
Ensure that the selected interface is operational (loopback interfaces are by definition always operational), or do not use the interface command for SNTP configuration.
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Posted 5 years ago

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