QoS operating notes and restrictions

  • All switches: For explicit QoS support of IP subnets, Hewlett Packard Enterprise recommends forcing IP subnets onto separate VLANs and then configuring VLAN-based classifiers for those VLANs.

  • For devices that do not support 802.1Q VLAN-tagged ports: For communication between these devices and the switch, connect the device to a switch port configured as Untagged for the VLAN in which you want the device's traffic to move.

  • Port tagging rules: For a port on the switch to be a member of a VLAN, the port must be configured as either Tagged or Untagged for that VLAN. A port can be an untagged member of only one VLAN of a given protocol type. Otherwise, the switch cannot determine which VLAN should receive untagged traffic.

  • Not supported: Use of an inbound 802.1p packet priority as a classifier for remapping a packet's outbound priority to different 802.1p priority. For example, where inbound packets carry an 802.1p priority of 1, QoS cannot be configured use this priority as a classifier for changing the outbound priority to 0.