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Ip Multicast (igmp) Interaction With Qos; Qos Messages In The Cli - HP ProCurve Series 2810 Management And Configuration Manual

Procurve series 2810 switches.
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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
Priority
Affects Packet
Not Enabled
Yes
Enabled
See above para-
graph.

QoS Messages in the CLI

Message
DSCP Policy < decimal-codepoint > not
configured
Cannot modify DSCP Policy < codepoint > - in
use by other qos rules.
Quality of Service (QoS): Managing Bandwidth More Effectively

IP Multicast (IGMP) Interaction with QoS

Switch Port Output
Queue
Determined by QoS
High
Meaning
You have attempted to map a QoS type to 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 type to the
codepoint.
You have attempted to map a QoS type to a
codepoint that is already in use by other QoS
types. Before remapping the codepoint to a
new priority, you must reconfigure the other
QoS types so that they do not use this
codepoint. You can have multiple QoS types
use this same codepoint as long as it is
acceptable for all such types to use the same
priority.
Outbound 802.1p Setting
(Requires Tagged VLAN)
Determined by QoS
As determined by QoS if QoS is
active.
6-65

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