Accton Technology ES4710BD - Manual (Page 246)

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E ES4710BD 10 Slots L2/L3/L4 Chassis Switch
Switch(Config-Mstp-Region)#
10.4.1.4 debug spanning-tree
Command: debug spanning-tree
no debug spanning-tree
Function: Enables MSTP debug information: the “no debug spanning-tree” command disables
MSTP debug information.
Command mode: Admin Mode
Usage Guide: This command is the main switch for the sophisticated MSTP debugging functions,
turn on the debugging information as needed in each level, then turn on the main switch to enable
debugging information printouts. Debug switch in all the levels including: view MSTP running
BPDU packet sending/receiving, events handling, status machine, counters, etc. The debugging
information is typically used for adjustments by technicians; users can ignore such information.
Example: Enabling the debug information for receiving BPDU packets on port 1/1.
Switch#debug spanning-tree
Switch#debug spanning-tree bpdu rx interface e1/1
10.4.2 MSTP Troubleshooting Help
& If MSTP is to be run in the switch, MSTP must be first enabled globally. Before enabling global
MSTP, port MSTP must not allowed be enabled.
& MSTP timer parameters are related, improper configuration may render the switch unable to
work properly. The relationship between the timers are:
2×(Bridge_Forward_Delay – 1.0 seconds) >= Bridge_Max_Age
Bridge_Max_Age >= 2 ×(Bridge_Hello_Time + 1.0 seconds)
& When modifying MSTP parameters, the user should be aware of the resulting topology. All
parameter configurations, except those bridge based global settings, are instance-based
configurations, caution should be taken to ensure parameter-instance agreement during
configuration.
& The MSTP function, port MAC binding and 802.1x function of ES4710BD are mutually
exclusive. When MAC binding and IEEE 802.1x are configured, MSTP cannot be enabled.