Qtech QSW-2910-09T-POE-AC/DC [117/212] Configure hello time features

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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.

8.2.7 Configure Hello Time features

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

8.2.8 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 fault, if

the value is too small. If the value is too large, the link fault cannot be known timely. Max Age