iv

Configuring the mode a port uses to recognize/send MSTP packets ······································································ 85

Enabling outputting port state transition information ·································································································· 86

Enabling the spanning tree feature ······························································································································ 87

Configuration restrictions and guidelines ··········································································································· 87

Enabling the spanning tree feature (in STP/RSTP/MSTP mode) ······································································ 87

Enabling the spanning tree feature (in PVST mode) ·························································································· 87

Performing mCheck ························································································································································ 88

Performing mCheck globally ································································································································ 88

Performing mCheck in interface view ················································································································· 88

Configuring Digest Snooping ······································································································································· 89

Configuration restrictions and guidelines ··········································································································· 89

Configuration procedure ······································································································································ 89

Digest Snooping configuration example ············································································································· 90

Configuring No Agreement Check ······························································································································ 91

Configuration prerequisites ·································································································································· 92

Configuration procedure ······································································································································ 92

No Agreement Check configuration example···································································································· 93

Configuring TC snooping ·············································································································································· 93

Configuration restrictions and guidelines ··········································································································· 94

Configuration procedure ······································································································································ 94

Configuring protection functions ·································································································································· 94

Configuration prerequisites ·································································································································· 94

Enabling BPDU guard ··········································································································································· 94

Enabling root guard ·············································································································································· 95

Enabling loop guard ············································································································································· 96

Enabling TC-BPDU guard······································································································································ 97

Enabling BPDU drop ············································································································································· 97

Displaying and maintaining the spanning tree ··········································································································· 98

Spanning tree configuration examples ························································································································ 98

MSTP configuration example ······························································································································· 98

PVST configuration example ······························································································································ 102

Configuring BPDU tunneling ··································································································································· 106

Overview ······································································································································································· 106

Background ·························································································································································· 106

BPDU tunneling implementation ························································································································· 107

Enabling BPDU tunneling ············································································································································ 108

Configuration prerequisites ································································································································ 108

Configuration restrictions and guidelines ········································································································· 109

Configuration procedure ···································································································································· 109

Configuring destination multicast MAC address for BPDUs ···················································································· 109

BPDU tunneling configuration examples ···················································································································· 110

BPDU tunneling for STP configuration example ······························································································· 110

BPDU tunneling for PVST configuration example ····························································································· 111

Configuring VLANs ················································································································································· 113

Overview ······································································································································································· 113

VLAN fundamentals············································································································································· 113

VLAN types ·························································································································································· 114

Protocols and standards ····································································································································· 115

Configuring basic VLAN settings································································································································ 115

Configuration restrictions and guidelines ········································································································· 115

Configuration procedure ···································································································································· 115

Configuring basic settings of a VLAN interface ······································································································· 116

Configuration procedure ···································································································································· 116