The set protocols spanning-tree mstp max-age command sets the BPDU aging time on the switching device when MSTP is running.
set protocols spanning-tree mstp max-age <max-age>
Specifies the BPDU aging time. The value is an integer, in seconds, that ranges from 6 to 40. The default value is 20s.
Max Age is the maximum lifetime of a received BPDU packets. If the BPDUs time out, the switching device ages the BPDUs and blocks the port that receives the BPDUs.
The relationships between the Hello Time, Forward Delay, and Max Age are as follows. The spanning tree functions properly only if the relationships are correctly established. Otherwise, network flapping occurs.
admin@Xorplus# set protocols spanning-tree mstp max-age 15 admin@Xorplus# commit