HP LH4r HP Netserver 10/100TX PCI LAN Adapter Guide - Page 27
IEEE 802.1p Tagging
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Chapter 5 Configuring the Adapter and Installing Drivers and port. Priority Packet provides two different methods for prioritizing traffic: IEEE 802.1p tagging and High Priority Queue. IEEE 802.1p Tagging IEEE 802.1p is a new IEEE standard for tagging, or adding additional bytes of information to, packets with different priority levels. Packets are tagged with four additional bytes, which increase the packet size and indicate a priority level. When these packets are sent out on the network, the higherpriority packets are transferred first. Priority packet tagging (also known as Traffic Class Expediting) allows the adapter to work with other elements of the network (switches, routers) to deliver priority packets first. 802.1p tagging enables you to assign specific priority levels from 0 (low) to 7 (high). Using the IEEE 802.1p standard for packet tagging, you can assign values to packets based on their priority. This method requires a network infrastructure that supports packet tagging. The routing devices receiving and transferring these packets on your network must support 802.1p for tagging to be effective. After you set up the priority filter in Priority Packet, you must launch HPSet and select 802.1p/802.1Q Tagging on the Advanced tab. CAUTION IEEE 802.1p tagging increases the size of the packets it tags. Some hubs and switches won't recognize the larger packets and will drop them. Check your hub or switch documentation to see if it supports 802.1p. (You can configure the switch to strip the tags from the packets and send it on to the next destination as normal traffic.) If these devices don't support 802.1p or you're not sure, use High Priority Queue (HPQ) to prioritize network traffic. 19