D-Link DGS-6600-48TS Configuration Guide - Page 140
Specifying the Bridge Priority, Command, Explanation, Data Rate, Path Cost
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Volume 3-Layer 2 Configurations / Chapter 14-Spanning Tree Protocol (STP) Configuration STP Configuration Commands Specifying the Bridge Priority The Bridge ID in 802.1d is formed by the 16-bit bridge priority and 6 bytes of the MAC Address. In 802.1w, the 16-bit bridge priority is divided into a 4-bit port priority and a 12-bit extension system ID. Therefore, the specified bridge priority must be divisible by 4096. Use the following command to specify the bridge priority: Command spanning-tree priority PRIORITY Explanation Specifies the bridge priority for the entire Switch. In the following example, the user configures the bridge priority for the entire Switch to be 4096: DGS-6600:2>enable DGS-6600:15#configure terminal DGS-6600:15(config)#spanning-tree priority 4096 DGS-6600:15(config)#end Specifying per Port Priority The port ID in 802.1d is formed by an 8-bit priority and an 8-bit port number. In 802.1w, the priority is formed by a 4-bit port priority and a 12-bit port number. Therefore, the specified port priority must be divisible by 16. Use the following command to specify the STP priority for a port: Command spanning-tree port-priority PRIORITY Explanation Specifies the STP priority for the port. In the following example, the user configures the STP priority of Ethernet interface 4.20 to be 0: DGS-6600:2>enable DGS-6600:15#configure terminal DGS-6600:15(config)#interface eth4.20 DGS-6600:15(config-if)#spanning-tree port-priority 0 DGS-6600:15(config-if)#end Specifying per Port Path Cost The link path cost value represents the media speed. The path cost can be auto-determined based on the media type or manually specified by the user. The following table provides information about how the path cost is auto assigned. Data Rate Path Cost 1 Mb/s 20,000,000 10 Mb/s 2,000,000 Table 14-1 Auto-assigned Path Cost for an Interface DGS-6600 Configuration Guide 140