stp timer max-age

Use stp timer max-age to set the max age timer of the device.

Use undo stp timer max-age to restore the default.

Syntax

stp [ vlan vlan-id-list ] timer max-age time

undo stp [ vlan vlan-id-list ] timer max-age

Default

The max age is 2000 centiseconds.

Views

System view

Predefined user roles

network-admin

Parameters

vlan vlan-id-list: Specifies a space-separated list of up to 10 VLAN items. Each item specifies a VLAN or a range of VLANs in the form of vlan-id1 [ to vlan-id2 ]. The value for vlan-id2 must be equal to or greater than the value for vlan-id1. The value range for the vlan-id argument is 1 to 4094. If you set the STP, RSTP, or MSTP max age, do not specify this option.

time: Sets the max age in centiseconds in the range of 600 to 4000 in increments of 100 (as in 600, 700, 800).

Usage guidelines

In the CIST of an MSTP network, the device determines whether a configuration BPDU received on a port has expired based on the max age timer. If the configuration BPDU has expired, a new spanning tree calculation process starts. The max age timer takes effect only on the CIST (or MSTI 0).

Do not set the max age timer with this command. As a best practice, specify the network diameter of the switched network by using the stp bridge-diameter command. The stp bridge-diameter command makes the spanning tree protocols automatically calculate the optimal settings for the max age timer. If the network diameter uses the default value, the max age timer also uses the default value.

Examples

# In MSTP mode, set the max age timer to 1000 centiseconds.

<Sysname> system-view
[Sysname] stp timer max-age 1000

# In PVST mode, set the max age timer for VLAN 2 to 1000 centiseconds.

<Sysname> system-view
[Sysname] stp vlan 2 timer max-age 1000

Related commands

stp bridge-diameter

stp timer forward-delay

stp timer hello