Use the Spanning Trees subtab to view Ether Bridge spanning tree parameters. The Cisco ONS node
operates STP according to IEEE 802.1D. The E-Series Ethernet cards support common STPs on a per-circuit basis up to a total of eight STP instances. It does not support per-VLAN STP. In single-card mode, STP can be disabled or enabled on a per-circuit basis during circuit creation. Disabling STP will preserve the number of available STP instances.
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Displays the spanning tree number.
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Displays the node unique identifier that transmits the configuration bridge protocol data unit (BPDU); the bridge ID is a combination of the bridge priority and the MAC address.
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Displays the amount of time in seconds since the last topology change.
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Displays the number of times the STP topology has been changed since the node booted up.
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Displays the designated root for a particular STP instance.
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Displays the total path cost to the designated root.
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Displays the port used to reach the root.
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Displays the maximum time that received-protocol information is retained before it is discarded.
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Displays the time interval, in seconds, between the transmission of configuration BPDUs by a bridge that is the spanning tree root or is attempting to become the spanning tree root.
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Displays the minimum time period, in seconds, that elapses during the transmission of configuration information on a given port.
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Displays the time spent by a port in the listening state and the learning state.
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Displays context-sensitive help.
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