D-Link DES-5664TX User Guide - Page 56

Fast Ethernet Switching System User's Guide network. When the packet reaches the next hub or switch and is sent out again, the Path Cost becomes two. Each switch and active hub regenerates the packet. To determine the Root Path Cost, count the number of times the packet is regenerated. The switch with the lowest Path Cost is the Root Bridge. Make the Root Bridge the best switch on the network. Hello Time Is the interval between two transmissions of packets sent by the Root Bridge to tell all other switches that it is the Root Bridge. The Hello Time can be set manually, with a range in seconds from 1 to 10. If the Hello Time is set for the switch and the switch is not the Root Bridge then the Hello Time will not take effect until the switch becomes the Root Bridge. Forward Delay Time This is the time any port on the DES-5600 spends in the listening state while moving from the listening state to the forwarding state. It can be set from 4 to 30 seconds. Use the following formula when setting the Hello Time and the Forward Delay Time: 2 x (Forward Delay minus 1 second) > Max Age 2 x (Hello Time plus 1 second) < Max Age Max Age Time Is the time a non-root bridge waits for a packet to be sent. At the end of the Max Age, if a packet has not been received from the Root Bridge, the DES-5600 will start sending its own packets and request permission to become the Root Bridge. The switch with the lowest Bridge Identifier is the Root Bridge. It is best to make the Root Bridge the best switch on the network to ensure the best network performance and reliability. Root Bridge Specifies the MAC address of the Root Bridge. The DES-5600 may or may not be the root bridge. The DES-5600 is the default root bridge. Root Port Specifies the preferred path to the Root Bridge. Only one path per bridge can exist. The default setting is none. Managing the DES-5600 49