38CHAPTER 4: USING THE CENTRAL CONFIGURATION MANAGER
Priority & VLAN
Configuration
11Click the Priority & VLAN Configuration tab along the top of the Device Configuration window to view these settings:
Port Based Settings
12To change the Port Based Settings, first select the Port’s tab you want to make the changes to.
13To change the Look-up Scheme from the default of Use Both, click the box and select an option from the drop list.
Both the Use IEEE 802.1p Traffic Class Field and Use IP TOS, DiffServ fields look-up schemes examine Ethernet packets to determine their prioritization. The former looks at one portion of the packet, effectively making it a Layer 2 tool. The latter looks at a different part of the packet, effectively making it a Layer 3 tool.
The Look-up Scheme is part of the prioritization of Ethernet packets. Prioritization determines which packets clear the buffer first. If you didn’t care about the prioritization of packets, you would choose None. If you wanted to prioritize voice packets on Port 1, for example, you would choose another option.
