R1-SW24L2B User’s Manual
13-18
Setting Spanning Tree Timers
BPDU contains spanning tree timers (hello, forward delay, and max-age timers) that affect the
performance of the entire spanning tree. By default, the following values are set to the timers:
y
Hello Timer : 2 seconds
y Max age Timer : 20 seconds
y Forward delay Timer : 15 seconds
You can set spanning tree timers for individual VLANs. To set spanning tree timers for a
specific VLAN, perform this task in Privileged mode:
Table 13-10 Setting spanning tree timers
Command Task
configure terminal
1. Enter Global configuration mode.
stp hello-time <value>
vlan id <vlan-id>
2. Set the STP hello time for a VLAN.
y <value>: The STP hello time. The hello time is the interval
between the generation of configuration messages by the root
switch (1 ~ 10 seconds, default: 2 seconds)
y <vlan-id>: VLAN ID (1 ~ 4094)
stp max-age <value>
vlan id <vlan-id>
3. Sets the STP maximum aging time for a VLAN.
y <value>: The STP maximum aging time. The maximum aging
time is the number of seconds a switch waits without receiving
spanning-tree configuration messages before attempting a
reconfiguration. (6 ~ 40 seconds, default: 20 seconds)
y <vlan-id>: VLAN ID (1 ~ 4094)
stp forward-delay
<value> vlan id
<vlan-id>
4. Set the STP forward delay for a specific VLAN.
y <value>: The STP forward time . The forward delay is the
number of seconds a port waits before changing from its
spanning-tree learning and listening states to the forwarding
state. (4 ~ 30 seconds, default: 15 seconds)
y <vlan-id>: VLAN ID (1 ~ 4094)
end
5. Return to privileged mode.
show stp vlan <vlan-id>
6. Verify the STP configuration change.
y <vlan-id>: VLAN ID (1 ~ 4094)
The following example shows how to set STP hello timers to 5 seconds for a VLAN:
# configure terminal
(config)# stp hello-time 5 vlan id 2
(config)# end
# show stp vlan id 2
