R21xx-HP FlexFabric 11900 Layer 2 LAN Switching Configuration Guide
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Configuring spanning tree protocols ························································································································ 56
STP ··················································································································································································· 56
STP protocol packets ············································································································································· 56
Basic concepts in STP ············································································································································ 57
Calculation process of the STP algorithm ··········································································································· 58
RSTP ················································································································································································· 63
MSTP ················································································································································································ 63
MSTP features ························································································································································ 63
MSTP basic concepts ············································································································································ 63
How MSTP works ·················································································································································· 67
MSTP implementation on devices ························································································································ 68
Protocols and standards ················································································································································ 68
Spanning tree configuration task lists ·························································································································· 68
STP configuration task list ····································································································································· 69
RSTP configuration task list ··································································································································· 69
MSTP configuration task list ································································································································· 70
Setting the spanning tree mode ···································································································································· 71
Configuring an MST region ·········································································································································· 72
Configuring the root bridge or a secondary root bridge ·························································································· 73
Configuring the current device as the root bridge of a specific spanning tree ·············································· 73
Configuring the current device as a secondary root bridge of a specific spanning tree ······························ 73
Configuring the device priority ····································································································································· 74
Configuring the maximum hops of an MST region ···································································································· 74
Configuring the network diameter of a switched network ························································································· 75
Configuring spanning tree timers ································································································································· 75
Configuration restrictions and guidelines ··········································································································· 76
Configuration procedure ······································································································································ 76
Configuring the timeout factor ······································································································································ 76
Configuring the maximum port rate ····························································································································· 77
Configuring edge ports ················································································································································· 77
Configuration restrictions and guidelines ··········································································································· 77
Configuration procedure ······································································································································ 77
Configuring path costs of ports ···································································································································· 78
Specifying a standard for the device to use when it calculates the default path cost ··································· 78
Configuring path costs of ports ···························································································································· 79
Configuration example ········································································································································· 80
Configuring the port priority ········································································································································· 80
Configuring the port link type ······································································································································· 81
Configuration restrictions and guidelines ··········································································································· 81
Configuration procedure ······································································································································ 81
Configuring the mode a port uses to recognize and send MSTP packets ······························································· 81
Enabling outputting port state transition information ·································································································· 82
Enabling the spanning tree feature ······························································································································ 82
Performing mCheck ························································································································································ 83
Performing mCheck globally ································································································································ 83
Performing mCheck in interface view ················································································································· 83
Configuring Digest Snooping ······································································································································· 84
Configuration restrictions and guidelines ··········································································································· 84
Configuration procedure ······································································································································ 84
Digest Snooping configuration example ············································································································· 85
Configuring No Agreement Check ······························································································································ 86
Configuration prerequisites ·································································································································· 87
Configuration procedure ······································································································································ 87
No Agreement Check configuration example···································································································· 87