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Fast Ethernet Switching System User’s Guide
Managing the DES-5024
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Spanning Tree Algorithm
Spanning Tree Algorithm can be enabled or disabled. Use Spanning Tree to prevent
network loops.
Bridge Priority
The Bridge Priority can be from 0 to 65535. Zero is the highest Bridge Priority. The
higher the Bridge Priority the greater the chance that the DES-5024 will be selected as
the Root Bridge. The DES-5024 with the highest Bridge Priority is the Root Bridge.
Root Cost
The Root Cost is the number of times a packet is regenerated before reaching its
destination. A source sends a packet to the first device (switch or hub) on the 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-5024 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-5024 will start sending its
own packets and request permission to become the Root Bridge. If it turns out that the
DES-5024 has the lowest Bridge Identifier it will become the Root Bridge.