Management Guide - Kamery IP

Class of Service Configuration3Class of Service ConfigurationClass of Service (CoS) allows you to specify which data packets have greaterprecedence when traffic is buffered in the switch due to congestion. This switchsupports CoS with four priority queues for each port. Data packets in a port’shigh-priority queue will be transmitted before those in the lower-priority queues. Youcan set the default priority for each interface, and configure the mapping of framepriority tags to the switch’s priority queues.Layer 2 Queue SettingsSetting the Default Priority for InterfacesYou can specify the default port priority for each interface on the switch. All untaggedpackets entering the switch are tagged with the specified default port priority, andthen sorted into the appropriate priority queue at the output port.Command Usage• This switch provides four priority queues for each port. It uses Weighted RoundRobin to prevent head-of-queue blockage.• The default priority applies for an untagged frame received on a port set to acceptall frame types (i.e, receives both untagged and tagged frames). This priority doesnot apply to IEEE 802.1Q VLAN tagged frames. If the incoming frame is anIEEE 802.1Q VLAN tagged frame, the IEEE 802.1p User Priority bits will be used.• If the output port is an untagged member of the associated VLAN, these frames arestripped of all VLAN tags prior to transmission.Command Attributes• Default Priority 15 – The priority that is assigned to untagged frames received onthe specified interface. (Range: 0-7; Default: 0)• Number of Egress Traffic Classes – The number of queue buffers provided foreach port.15. CLI displays this information as “Priority for untagged traffic.”3-265