Qtech QSW-2900-24T-AC [156/209] Configure hello time

Qtech QSW-2900-24T-AC [156/209] Configure hello time
10-154
10.2.6 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
10.2.7 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 is determined by diameter of network, and the default time of 20
seconds is suggested. 2*(Hello Time + 1) Max Age 2*(ForwardDelay 1)
10.2.8 Configure path cost of specified interfaces
Configure interface STP path cost and choose the path with the smallest path cost to be the effective path. The
path cost is related to the link speed rate. The larger the speed rate is, the less the cost is. STP can auto-detect the link
speed rate of current interface and converse it to be the cost. Configure it in interface configuration mode:
· Configure path cost of specified interface
spanning-tree cost cost
· Restore the default path cost of specified interface

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