HP 6120G/XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management - Page 187
Assigning an 802.1p Priority to IPv4 Packets on the Basis, of the ToS Precedence Bits,
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Quality of Service (QoS): Managing Bandwidth More Effectively Using QoS Classifiers to Configure Quality of Service for Outbound Traffic Assigning an 802.1p Priority to IPv4 Packets on the Basis of the ToS Precedence Bits If a device or application upstream of the switch sets the precedence bits in the ToS byte of IPv4 packets, you can use this feature to apply that setting for prioritizing packets for outbound port queues. If the outbound packets are in a tagged VLAN, this priority is carried as an 802.1p value to the adjacent downstream devices. Syntax: qos type-of-service ip-precedence Causes the switch to automatically assign an 802.1p priority to all IPv4 packets by computing each packet's 802.1p priority from the precedence bits the packet carries. This priority determines the packet's queue in the outbound port to which it is sent. If the packet leaves the switch on a tagged port, it carries the 802.1p priority with it to the next downstream device. (ToS IP Precedence Default: Disabled) no qos type-of-service Disables all ToS classifier operation, including prioritization using the precedence bits. show qos type-of-service When ip-precedence is enabled (or if neither ToS option is configured), shows the ToS configuration status. If diffservices is enabled, lists codepoint data as described under "Assigning a DSCP Policy on the Basis of the DSCP in IPv4 Packets Received from Upstream Devices" on page 5-21. With this option, prioritization of outbound packets relies on the IP-Precedence bit setting that IP packets carry with them from upstream devices and applications. To configure and verify this option: Default ToS Configuration Current ToS Configuration Figure 5-3. Example of Enabling ToS IP-Precedence Prioritization To replace this option with the ToS diff-services option, configure diff-services as described below, which automatically disables IP-Precedence. To disable IP-Precedence without enabling the diff-services option, use this command: ProCurve(config)# no qos type-of-service 5-16