Cisco Model D9479 Gigabit QAM Modulator Technical References
Avoiding Unicast Flooding with a
GQAM Modulator
GQAM Modulator
Overview
Introduction
In normal conditions, when a video stream is sent through a switch to a GQAM
modulator, the packets from that video stream should only be sent to the port that
is connected to the GQAM. However, there have been occasions in which those
packets are "flooded" through all ports on the switch every five minutes. This
issue can be corrected by adjusting the CAM aging timer.
modulator, the packets from that video stream should only be sent to the port that
is connected to the GQAM. However, there have been occasions in which those
packets are "flooded" through all ports on the switch every five minutes. This
issue can be corrected by adjusting the CAM aging timer.
Purpose
This document explains a unicast flooding issue that can occur with with LAN
switches and provides a workaround to prevent the issue.
switches and provides a workaround to prevent the issue.
Audience
This document was written for headend technicians. Field service engineers and
Cisco
Cisco
®
Services engineers may also find the information in this document helpful.
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Document Version
This is the first formal release of this document.