Brocade Mobility RFS7000-GR Controller System Reference Guide (Supporting software release 4.1.0.0-040GR and later) - Manual (Page 236)

222 Brocade Mobility RFS7000-GR Controller System Reference Guide
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Multiple spanning tree
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Viewing and configuring bridge instance details
The Bride Instance tab displays the number of MSTP instance created and VLANS associated with
it. To view and configure the MSTP bridge instance:
CIST Bridge HelloTime Set the CIST Hello Time (in seconds). After the defined interval all bridges in a
bridged LAN exchange BPDUs.
The hello time is the time interval (in seconds) the device waits between BPDU
transmissions.
A very low value leads to excessive traffic on the network, whereas a higher value
delays the detection of a topology change. This value is used by all instances.
Bridge Hello Time Displays the configured Hello Time. If this is the root bridge, the value is equal to
the configured Hello Time.
CIST Bridge Forward
Delay Enter the CIST bridge forward delay value received from the root bridge. If this is
the root bridge, the value will be equal to the Configured Forward Delay.
The forward delay value is the maximum time (in seconds) the root device waits
before changing states (from a listening state to a learning state to a forwarding
state).
This delay is required, as every device must receive information about topology
changes before forwarding frames.
In addition, each port needs time to listen for conflicting information that would
make it return to a blocking state; otherwise, temporary data loops may result.
CIST Bridge Forward
Delay Displays the configured forward delay period.
CIST Bridge Maximum
Age Enter the CIST bridge maximum age received from the root bridge. The max-age is
the maximum time (in seconds) for which (if a bridge is the root bridge) a message
is considered valid. This prevents the frames from looping indefinitely. The
max-age should be greater than twice the value of hello time plus one, but less
than twice the value of forward delay minus one. The allowable range for max-age
is 6-40 seconds. Configure this value sufficiently high, so a frame generated by
root can be propagated to the leaf nodes without exceeding the maxage.
Bridge Maximum Age Displays the BPDU maximum age value. If this is the root bridge, the value will be
equal to the Configured Max Age.