Users Guide

spanning-tree mst mac-flush-threshold
Configures the mac-flush threshold value for a specific instance.
Syntax
spanning-tree mst instance-number mac-flush-threshold threshold-value
Parameters
• instance-number—Enter the instance number, from 0 to 4094.
• threshold-value—Enter the threshold value for the number of flushes, from 0 to 65535. The default
value is 5.
Default Not configured
Command Mode CONFIGURATION
Usage Information This threshold indicates the number of port-based flush requests allowed to be invoked before starting the flush
optimization. When the flush interval value is non-zero, port-and-instance-based flushing is triggered until the
threshold is reached. Once the threshold is reached the MAC flush timer starts. On timer expiry, the system
triggers instance-based flushing. When the timer is running, all port-and-instance-based flushing is suppressed.
The
no form of the command sets the flush indication threshold of the specific instance to its default value.
Example
OS10(config)# spanning-tree mst 10 mac-flush-threshold 255
Supported
Releases
10.4.0E(R1) or later
spanning-tree mst max-age
Configures the time period the bridge maintains configuration information before refreshing the information by recomputing the MST
topology.
Syntax
max-age seconds
Parameters seconds — Enter a maximum age value in seconds, from 6 to 40.
Default 20 seconds
Command Mode CONFIGURATION
Usage Information The no version of this command resets the value to the default.
Example
OS10(config)# spanning-tree mst max-age 10
Supported
Releases
10.2.0E or later
spanning-tree mst max-hops
Configures the maximum hop count for a BPDU to travel before it is discarded.
Syntax
spanning-tree mst max-hops number
Parameters number — Enter a maximum hop value, from 6 to 40.
Default 20
Command Mode CONFIGURATION
Usage Information A device receiving BPDUs waits until the max-hops value expires before discarding it. When a device receives
the BPDUs, it decrements the received value of the remaining hops and uses the resulting value as remaining-
hops in the BPDUs. If the remaining MSTP 1333 hops reach zero, the device discards the BPDU and ages out any
information that it holds for the port. The command configuration applies to all common IST (CIST) in the MST
region.
Example
OS10(config)# spanning-tree mst max-hops 30
Supported
Releases
10.2.0E or later
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