Cisco Nexus 5000 Series Switch CLI Software Configuration Guide, NX-OS 4.0(1a)N1 (OL-16597-01, January 2009)

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Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 9 Configuring MST
Configuring MST
To configure the switch priority for an MST instance, perform this task:
This example shows how to configure the priority of the bridge to 4096 for MSTI 5:
switch# configure terminal
switch(config)# spanning-tree mst 5 priority 4096
Configuring the Hello Time
You can configure the interval between the generation of configuration messages by the root bridge for
all instances on the switch by changing the hello time.
Note Exercise care when using this command. For most situations, we recommend that you enter the
spanning-tree mst instance-id root primary and the spanning-tree mst instance-id root secondary
global configuration commands to modify the hello time.
To configure the hello time, perform this task:
This example shows how to configure the hello time of the switch to 1 second:
switch# configure terminal
switch(config)# spanning-tree mst hello-time 1
Command Purpose
Step 1
switch# configure terminal
Enters configuration mode.
Step 2
switch(config)# spanning-tree mst
instance-id priority priority-value
Configures a switch priority as follows:
• For instance-id, you can specify a single instance,
a range of instances separated by a hyphen, or a
series of instances separated by a comma. The
range is from 1 to 4094.
• For priority, the range is from 0 to 61440 in
increments of 4096; the default is 32768. A lower
number indicates that the switch will most likely
be chosen as the root bridge.
Priority values are 0, 4096, 8192, 12288, 16384,
20480, 24576, 28672, 32768, 36864, 40960,
45056, 49152, 53248, 57344, and 61440. The
system rejects all other values.
Command Purpose
Step 1
switch# configure terminal
Enters configuration mode.
Step 2
switch(config)# spanning-tree mst
hello-time seconds
Configures the hello time for all MST instances. The
hello time is the interval between the generation of
configuration messages by the root bridge. These
messages mean that the switch is alive. For seconds,
the range is from 1 to 10, and the default is 2 seconds.