iii
Configuring the root bridge or a secondary root bridge ·························································································· 73
Configuring the current switch as the root bridge of a specific spanning tree ··············································· 74
Configuring the current switch as a secondary root bridge of a specific spanning tree······························· 74
Configuring the switch priority ····································································································································· 74
Configuring the maximum hops of an MST region ···································································································· 75
Configuring the network diameter of a switched network ························································································· 75
Configuring spanning tree timers ································································································································· 76
Configuration restrictions and guidelines ··········································································································· 76
Configuration procedure ······································································································································ 77
Configuring the timeout factor ······································································································································ 77
Configuring the maximum port rate ····························································································································· 78
Configuration guidelines ······································································································································ 78
Configuration procedure ······································································································································ 78
Configuring edge ports ················································································································································· 78
Configuration restrictions and guidelines ··········································································································· 78
Configuration procedure ······································································································································ 79
Configuring path costs of ports ···································································································································· 79
Specifying a standard for the switch to use when calculating the default path cost ····································· 79
Configuring the path costs of ports ····················································································································· 81
Configuration example ········································································································································· 81
Configuring the port priority ········································································································································· 82
Configuring the port link type ······································································································································· 83
Configuration restrictions and guidelines ··········································································································· 83
Configuration procedure ······································································································································ 83
Configuring the mode a port uses to recognize/send MSTP packets ······································································ 83
Enabling the spanning tree feature ······························································································································ 84
Enabling the spanning tree protocol in STP, RSTP, or MSTP mode ································································· 84
Enabling the spanning tree protocol in PVST mode ·························································································· 85
Performing mCheck ························································································································································ 85
Performing mCheck globally ································································································································ 86
Performing mCheck in interface view ················································································································· 86
Configuring the VLAN Ignore feature ·························································································································· 86
Configuration procedure ······································································································································ 87
Configuration example ········································································································································· 87
Configuring Digest Snooping ······································································································································· 88
Configuration restrictions and guidelines ··········································································································· 88
Configuration procedure ······································································································································ 88
Configuration example ········································································································································· 89
Configuring No Agreement Check ······························································································································ 90
Configuration prerequisites ·································································································································· 91
Configuration procedure ······································································································································ 91
Configuration example ········································································································································· 92
Configuring TC snooping ·············································································································································· 92
Configuration restrictions and guidelines ··········································································································· 93
Configuration procedure ······································································································································ 93
Configuring protection functions ·································································································································· 94
Enabling BPDU guard ··········································································································································· 94
Enabling root guard ·············································································································································· 94
Enabling loop guard ············································································································································· 95
Enabling TC-BPDU guard······································································································································ 96
Displaying and maintaining the spanning tree ··········································································································· 96
Spanning tree configuration examples ························································································································ 97
MSTP configuration example ······························································································································· 97
PVST configuration example ······························································································································ 101
