Raisecom
ISCOM2600G-HI (A) Series Configuration Guide
2 Ethernet
Raisecom Proprietary and Confidential
Copyright © Raisecom Technology Co., Ltd.
106
Step
Command
Description
2
Raisecom(config)#spanning-tree
transit-limit
value
Configure the maximum
transmission rate on the interface.
2.7.12 Configuring MSTP timer
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whether the configurations are outdated.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outdated configurations and STP will recalculate spanning tree.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.
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
Command
Description
1
Raisecom#config
Enter global configuration mode.
2
Raisecom(config)#spanning-tree
hello-time
value
Configure the Hello Time.
3
Raisecom(config)#spanning-tree
forward-delay
value
Configure the Forward Delay.
4
Raisecom(config)#spanning-tree
max-age
value
Configure the Max Age.
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.