Quality of Service (QoS): Managing Bandwidth More Effectively
QoS Operating Notes and Restrictions
IP Multicast (IGMP) Interaction with QoS
IGMP
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
IGMP High | QoS Configuration | Switch Port Output | Outbound 802.1p Setting |
Priority | Affects Packet | Queue | (Requires Tagged VLAN) |
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Not Enabled | Yes | Determined by QoS | Determined by QoS |
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Enabled | See above para- | High | As determined by QoS if QoS is |
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