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Configuring Spanning-Tree Features
Configuring Spanning-Tree Timers
Table 14-4
Table 14-4
Spanning-Tree Timers
Variable
Description
Hello timer
Controls how often the switch broadcasts hello messages to other switches.
Forward-delay timer
Controls how long each of the listening and learning states last before the NNI begins forwarding.
Maximum-age timer
Controls the amount of time the switch stores protocol information received on an NNI.
The sections that follow provide the configuration steps.
Configuring the Hello Time
You can configure the interval between the generation of configuration messages by the root switch by
changing the hello time.
Note
Exercise care when using this command. For most situations, we recommend that you use the
spanning-tree vlan vlan-id root primary and the spanning-tree vlan vlan-id root secondary global
configuration commands to modify the hello time.
Beginning in privileged EXEC mode, follow these steps to configure the hello time of a VLAN. This
procedure is optional.
Command
Step 1
configure terminal
Step 2
spanning-tree vlan vlan-id hello-time seconds
Step 3
end
Step 4
show spanning-tree vlan vlan-id
Step 5
copy running-config startup-config
To return to the default setting, use the no spanning-tree vlan vlan-id hello-time global configuration
command.
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
14-20
describes the timers that affect the entire spanning-tree performance.
Purpose
Enter global configuration mode.
Configure the hello time of a VLAN. The hello time is the
interval between the generation of configuration messages by
the root switch. These messages mean that the switch is alive.
•
For vlan-id, you can specify a single VLAN identified by
VLAN ID number, a range of VLANs separated by a
hyphen, or a series of VLANs separated by a comma. The
range is 1 to 4094.
For seconds, the range is 1 to 10; the default is 2.
•
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 14
Configuring STP
78-17058-01
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