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[EX] High CPU on EX Virtual Chassis when Sky Enterprise polls the interfaces

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Article ID: KB35844 KB Last Updated: 03 Jun 2020Version: 1.0
Summary:

The EX Virtual Chassis is configured and managed by Sky Enterprise. However, after some time, users may observe high CPU in relation to the mgd process.

This article provides a possible reason for high CPU to be seen and lists the Junos OS releases in which the issue is resolved.

 

Symptoms:

The Virtual Chassis shows 100% CPU on multiple mgd processes when Sky Enterprise polls interfaces for statistics:

root@jtaclab:RE:0% top | grep mgd
12860 root 1 76 0 56012K 31224K RUN 99.6H 22.07% mgd
30012 root 1 76 0 56004K 31168K RUN 95.3H 21.97% mgd
14524 root 1 76 0 56004K 31148K RUN 99.2H 21.53% mgd

 

Cause:

This problem seems to occur when any netconf connection is made from the EX Virtual Chassis to a destination target, and on any management platform that uses netconf to poll the interfaces on an EX Virtual Chassis.

 

Solution:

This issue has been resolved in Junos OS release 18.4R3, 19.1R3, 19.2R2, 19.3R3, and 19.4R2 as per PR1464439.

 

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