ii
Enabling outputting port state transition information ········································································· 41
Enabling the spanning tree feature ······························································································ 41
Restrictions and guidelines ·································································································· 41
Enabling the spanning tree feature in STP/RSTP/MSTP mode ···················································· 41
Enabling the spanning tree feature in PVST mode ···································································· 42
Performing mCheck ·················································································································· 42
About mCheck ·················································································································· 42
Restrictions and guidelines ·································································································· 42
Performing mCheck globally ································································································ 43
Performing mCheck in interface view ····················································································· 43
Disabling inconsistent PVID protection ························································································· 43
Configuring Digest Snooping ······································································································ 43
Configuring No Agreement Check ······························································································· 45
Configuring TC Snooping ··········································································································· 46
Configuring protection features ··································································································· 47
Spanning tree protection tasks at a glance ·············································································· 47
Configuring BPDU guard ····································································································· 48
Enabling root guard ··········································································································· 49
Enabling loop guard ··········································································································· 49
Configuring port role restriction ····························································································· 50
Configuring TC-BPDU transmission restriction ········································································· 51
Enabling TC-BPDU guard ··································································································· 51
Enabling BPDU drop ·········································································································· 52
Enabling PVST BPDU guard ································································································ 52
Disabling dispute guard ······································································································ 52
Enabling the device to log events of detecting or receiving TC BPDUs ················································ 55
Disabling the device from reactivating edge ports shut down by BPDU guard ······································· 55
Enabling BPDU transparent transmission on a port ········································································· 55
Enabling SNMP notifications for new-root election and topology change events ···································· 56
Display and maintenance commands for the spanning tree protocols ·················································· 57
Spanning tree configuration examples ·························································································· 57
Example: Configuring MSTP ································································································ 57
Example: Configuring PVST ································································································ 61
Example: Configuring DRNI with PVST ·················································································· 64
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