Flapping interfaces in a Secure Gateway Virtual Appliance causing an increase in CPU usage

book

Article ID: 171485

calendar_today

Updated On:

Products

SG-300 Symantec WebFilter (formerly Blue Coat WebFilter - BCWF) SG-600 Intelligence Services SG-510 SG-810 SG-9000 SG-900 SG-S500 SG-S400 Secure Web Gateway Virtual Appliance SG-S200 SWG VA-100

Issue/Introduction

When using a Secure Gateway Virtual Appliance (SGVA) with network interfaces disabled from the GUI or CLI, we can see the interfaces going up and down constantly. This increases CPU in the TCPIP engine slightly.

Cause

When the NICs of the virtual machine appear as "Connected" in the virtualized environment, even if the NICs are disabled in the Management Console, the interface will try to activate itself and fail to do so, consuming resources unnecessarily.

Resolution

Disabling the "Connected" status of the virtual machine's unused NICs will stop the interfaces from flapping thus reducing CPU usage in the TCPIP engine.