HP 5300XL, 5304XL, 5348XL QoS Messages in the CLI

Quality of Service (QoS): Managing Bandwidth More Effectively

QoS Messages in the CLI

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	QoS Configuration	Switch Port Output	Outbound 802.1p Setting
Priority	Affects Packet	Queue	(Requires Tagged VLAN)
Not Enabled	Yes	Determined by QoS	Determined by QoS
Enabled	See above para-	High	As determined by QoS if
	graph.		QoS is active.

QoS Messages in the CLI

Message	Meaning
DSCP Policy < decimal-codepoint> not	You have attempted to map a QoS classifier to
configured	a codepoint for which there is no configured
	priority (No-override). Use the qos dscp-map
	command to configure a priority for the
	codepoint, then map the classifier to the
	codepoint.

Cannot modify DSCP Policy < codepoint > - in use by other qos rules.

You have attempted to map a QoS classifier to a codepoint that is already in use by other QoS classifiers. Before remapping the codepoint to a new priority, you must reconfigure the other QoS classifiers so that they do not use this codepoint. You can have multiple QoS classifiers use this same codepoint as long as it is acceptable for all such classifiers to use the same priority.

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