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Quality of Service: Managing Bandwidth More Effectively

Globally-Configured QoS

IP Multicast (IGMP) Interaction with QoS

IGMP high-priority-forward causes the switch to service the subscribed IP

multicast group traffic at high priority, even if QoS on the switch has relegated

the traffic to a lower priority. This does not affect any QoS priority settings,

so the QoS priority is honored by downstream devices. However, QoS does

take precedence over IGMP normal-priority traffic.

The switch’s ability to prioritize IGMP traffic for either a normal or high

priority outbound queue overrides any QoS criteria, and does not affect any

802.1p priority settings the switch may assign. For a given packet, if both IGMP

high priority and QoS are configured, the QoS classification occurs and the

switch marks the packet for downstream devices, but the packet is serviced

by the high-priority queue when leaving the switch.

IGMP High

Priority

QoS Configuration

Affects Packet

Switch Port Output

Queue

Outbound 802.1p Setting

(Requires Tagged VLAN)

Not Enabled Yes Determined by QoS Determined by QoS

Enabled See above para-

graph.

High As determined by QoS if QoS is

active.

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