ZyXEL GS1510-16 User Guide - Page 99
STP Status, continued
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Chapter 17 Spanning Tree Protocol Table 29 STP Status (continued) LABEL DESCRIPTION Hello Time This is the time interval (in seconds) at which the root switch transmits a configuration message. The root bridge determines Hello Time, Max Age and Forwarding Delay. Forward Delay This is the time (in seconds) the root switch will wait before changing states. Current Bridge Status MAC Address This is the MAC address of the current bridge. Priority Priority is used in determining the root switch, root port and designated port. The switch with the highest priority (lowest numeric value) becomes the STP root switch. If all switches have the same priority, the switch with the lowest MAC address will then become the root switch. Max Age Hello Time Forward Delay Path Cost Root Port Refresh Priority determines the root bridge, which in turn determines the Root Hello Time, Root Maximum Age and Root Forwarding Delay. This is the maximum time (in seconds) the Switch can wait without receiving a BPDU before attempting to reconfigure. All Switch ports (except for designated ports) should receive BPDUs at regular intervals. Any port that ages out STP information (provided in the last BPDU) becomes the designated port for the attached LAN. If it is a root port, a new root port is selected from among the Switch ports attached to the network. This is the time interval in seconds between BPDU (Bridge Protocol Data Units) configuration message generations by the root switch. This is the maximum time (in seconds) the Switch will wait before changing states. This delay is required because every switch must receive information about topology changes before it starts to forward frames. In addition, each port needs time to listen for conflicting information that would make it return to a blocking state; otherwise, temporary data loops might result. Path cost is the cost of transmitting a frame on to a LAN through that port. It is recommended to assign this value according to the speed of the bridge. The slower the media, the higher the cost. This is the number of the port on the Switch through which this Switch must communicate with the root of the Spanning Tree. Click this to update the status screen. GS1510 Series User's Guide 99