A10E/A28E/A28F Configuration Guide
Enter global configuration mode.
Alpha-A28E(config)#interface
port
port-id
Enter physical layer interface
configuration mode.
Alpha-A28E(config-
port)#spanning-tree extern-
path-cost
cost-value
Configure external path cost for
interface.
7.5.11 Configuring maximum transmitting speed for interface
Interface maximum transmitting speed means MSTP permitted transmitting maximum BPDU
number in each Hello Time. This parameter is a relative value and no unit. The bigger the
parameter is configured, the more packets are permitted to transmit in a Hello Time, the more
device resource it takes up. The same to time parameter, only root device configuration is
valid.
Configure interface maximum transmitting speed for the A10E/A28E as below.
Enter global configuration mode.
Alpha-A28E(config)#spanning-
tree transit-limit
value
Configure interface maximum
transmitting speed.
7.5.12 Configuring MSTP timer
Hello Time: the A10E/A28E sends the time interval of bridge configuration information
(BPDU) regularly to check whether there is failure in detection link of device. The
A10E/A28E sends hello packets to other devices around in Hello Time to check if there
is fault in the link. The default value is 2 seconds, and user can adjust the interval value
according to network condition. Reduce the interval when network link changes
frequently to enhance the stability of STP; by contrary, increasing interval value will
reduce system CPU resource occupation rate for STP.
Forward Delay: time parameter to ensure the safe remove of device status. Link fault
leads to network re-calculate 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 port and designated port start transmitting data at once.
This protocol adopts status remove system: before root port and designated interface
starting data forwarding, 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 value according to real condition, reduce it when network topology changes
infrequently and increase it in opposite.
Max Age: the bridge configuration information used by STP has a life time that is used
to judge whether the configuration information is outdated. The A10E/A28E will discard
outdated information and STP will recalculate spanning tree. The default value is 20
seconds. Too small age value may cause the frequent re-calculation of spanning tree,
while too bigger age value will make STP not adapt network topology change timely.
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