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Gigabit Ethernet Switch User's Guide
Root Cost Read-only object displays the cost for the path between the switch and the root bridge. If
the switch is the root bridge, then the root cost is zero.
Root Port Read-only object identifies the port (on the bridge) that offers the least path cost from the
bridge to the root bridge. In the event of a network loop, data packets will pass through the root port.
Max Age(Sec) Read-only object indicates the maximum age of STP information learned from the
network (on any port) before it is discarded.
Forward Delay(sec) Read-only object indicates how fast any port on the bridge can change its
spanning state when moving towards the forwarding state. The value determines how long the port
stays in each of the listening and learning states, which precede the forwarding state.
Hold Time(Sec) Read-only object displays the time interval during which no more than two configuration
BPDUs shall be transmitted by the bridge.
Root Priority(Sec) Read-only object displays the priority number of the root bridge of the Spanning
Tree. The value is used in conjunction with the bridge MAC address to set the bridge ID, which in
turn is used when determining the root bridge of a multibridged network. The root bridge is
responsible for processing data packets when network loops occur. The smaller the number set, the
higher the bridge priority is. The higher the bridge priority, the more chance the bridge has of
becoming the root bridge. A bridge priority ranges from 0 to 65535, with 0 being the highest priority.
Bridge Max Age (6-40 Sec) The Maximum Age is a read-write object that can be from 6 to 40
seconds. At the end of the Maximum Age, if a BPDU has still not been received from the Root ridge,
your Switch will start sending its own BPDU to all other switches for permission to become the Root
Bridge. If it turns out that your Switch has the lowest Bridge Identifier, it will become the Root
Bridge.
Bridge Hello Time (1-10 Sec) The Hello Time is a read-write object that can be from 1 to 10
seconds. This is the interval between two transmissions of BPDU packets sent by the Root Bridge to
tell all other switches that it is indeed the Root Bridge. If you set a Hello Time for your Switch, and it
is not the Root Bridge, the set Hello Time will be used if and when your Switch becomes the Root
Bridge.
Bridge Forward Delay (4-30 Sec) The Forward Delay is a read-write object that can be from 4 to
30 seconds. This is the time any port on the Switch spends in the listening state while moving from
the blocking state to the forwarding state.
Bridge Priority (0-65535 Sec) The Bridge Priority is a read-write object that can be from 0 to
65535. This is the priority number of the bridge. The value is used in conjunction with the bridge
MAC address to set the bridge ID, which in turn is used when determining the root bridge of a
multibridged network. The root bridge is responsible for processing data packets when network loops
occur. The smaller the number set, the higher the bridge priority is. The higher the bridge priority,
the more chance the bridge has of becoming the root bridge. Zero is the highest priority.
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