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ISCOM2600G-HI (A) Series Configuration Guide
2
2.7.12 Configuring MSTP timer
All devices in the whole switching network adopt the three time parameters on CIST root
device, so only the root device configuration is valid.
Configure the MSTP timer for the ISCOM2600G-HI series switch as below.
Step
1
2
3
4
2.7.13 Configuring edge interface
The edge interface indicates the interface neither directly connecting to any devices nor
indirectly connecting to any device through the network.
Step
Raisecom(config)#spanning-tree
transit-limit
Hello Time: the ISCOM2600G-HI series switch sends the interval of bridge
configurations (BPDU) regularly to check whether there is failure in detection link of the
ISCOM2600G-HI series switch. The ISCOM2600G-HI series switch sends Hello
packets to other devices around in the Hello time to check if there is fault in the link. The
default value is 2s. You can adjust the interval value according to network conditions.
Reduce the interval when network link changes frequently to enhance the stability of
STP. However, increasing the interval reduces CPU utilization rate for STP.
Forward Delay: the time parameter to ensure the safe transit of device status. Link fault
causes the network to recalculate spanning tree, but the new configuration message
recalculated cannot be transmitted to the whole network immediately. There may be
temporary loop if the new root interface and designated interface start transmitting data
at once. This protocol adopts status remove system: before the root interface and
designated interface starts forwarding data, it needs a medium status (learning status);
after delay for the interval of Forward Delay, it enters forwarding status. The delay
guarantees the new configuration message to be transmitted through whole network. You
can adjust the delay according to actual condition; in other words, reduce it when
network topology changes infrequently and increase it under opposite conditions.
Max Age: the bridge configurations used by STP have a life time that is used to judge
whether the configurations are outdated. The ISCOM2600G-HI series switch will discard
outdated configurations and STP will recalculate spanning tree. The default value is 20s.
Over short age may cause frequent recalculation of the spanning tree, while a too great
age value will make STP not adapt to network topology change timely.
Raisecom#config
Raisecom(config)#spanning-tree
hello-time
Raisecom(config)#spanning-tree
forward-delay
Raisecom(config)#spanning-tree
max-age
value
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Copyright © Raisecom Technology Co., Ltd.
Command
value
Command
value
value
Description
Configure the maximum
transmission rate on the interface.
Description
Enter global configuration mode.
Configure the Hello Time.
Configure the Forward Delay.
Configure the Max Age.
2 Ethernet
106
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