Qtech QSW-3200-28T [72/136] Configure switch forward delay

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9.2.6 Configure switch Forward Delay

When this switch is the root bridge, port state transition period is the Forward Delay time,

which is determined by the diameter of the switched network. The longer the diameter is, the

longer the time is. Configure it in global configuration mode:

 Configure Forward Delay

spanning-tree forward-time seconds

 Restore default Forward Delay

no spanning-tree forward-time

For example:

! Configure forward delay to 20 seconds

QTECH(config)#spanning-tree forward-time 20

Caution: If Forward Delay is configured too small, temporary redundancy will becaused; if

Forward Delay is configured too large, network will not be restored linking for a long time.

Forward Delay ranges from 4 to 30 seconds. The default forward delay time, 15 seconds is

suggested to use. Forward Delay≥Hello Time + 2.

9.2.7 Configure Hello Time

Suitable Hello Time can guarantee network bridge noticing link failure in time without

occupying too much resources. Configure it in global configuration mode:

 Configure Hello Time

spanning-tree hello-time seconds

 Restore default Hello Time

no spanning-tree hello-time

For example:

! Configure Hello Time to 5 seconds

QTECH(config)#spanning-tree hello-time 5

Caution: Too large Hello Time may cause link failure thought by network bridge for losing

packets of the link to restart accounting STP; too smaller Hello Time may cause network

bridge frequently to send configuration packet to strengthen the load of network and CPU.

Hello Time ranges from 1 to 10 seconds. It is suggested to use the default time of 2 seconds.

Hello Time ≤ Forward Delay – 2

9.2.8 Configure Max Age

Max Age is used to judge whether the packet is outdate. User can configure it according to the

real situation of the network in global configuration mode:

 Configure Max Age

spanning-tree max-age seconds

 Restore the default Max Age

no spanning-tree max-age

For example:

! Configure the Max Age to 10 seconds

QTECH(config)#spanning-tree max-age 10

Caution: Max Age is used to configure the longest aging interval of STP. Lose packet

when overtiming. The STP will be frequently accounts and take crowded network to be link