H3C S7500X Series Configuration Manual page 218

Contents
Configuring spanning tree protocols ····················································· 1
STP ········································································································································ 1
STP protocol frames ············································································································ 1
Basic concepts in STP ·········································································································· 3
Calculation process of the STP algorithm ················································································· 4
RSTP ···································································································································· 10
RSTP protocol frames ········································································································ 10
Basic concepts in RSTP ····································································································· 10
How RSTP works ·············································································································· 11
RSTP BPDU processing ····································································································· 11
PVST ···································································································································· 12
PVST protocol frames ········································································································ 12
Basic concepts in PVST ······································································································ 13
How PVST works ·············································································································· 13
MSTP ···································································································································· 13
MSTP features ·················································································································· 13
MSTP protocol frames ········································································································ 14
Basic concepts in MSTP ····································································································· 15
How MSTP works ·············································································································· 18
MSTP implementation on devices ························································································· 19
Rapid transition mechanism ································································································· 19
Protocols and standards ············································································································ 21
Configuration restrictions and guidelines ······················································································· 22
Compatibility with other features ··························································································· 22
Interface configuration restrictions ························································································· 22
PVST-enabled VLAN limit ··································································································· 22
Spanning tree configuration task lists ··························································································· 22
STP configuration task list ··································································································· 23
RSTP configuration task list ································································································· 23
PVST configuration task list ································································································· 24
MSTP configuration task list ································································································ 25
Setting the spanning tree mode ··································································································· 25
Configuring an MST region ········································································································ 26
Configuring the root bridge or a secondary root bridge ····································································· 27
Configuring the device as the root bridge of a specific spanning tree ············································ 27
Configuring the device as a secondary root bridge of a specific spanning tree ································ 28
Configuring the device priority ····································································································· 28
Configuring the maximum hops of an MST region ··········································································· 28
Configuring the network diameter of a switched network··································································· 29
Setting spanning tree timers ······································································································· 29
Configuration restrictions and guidelines ················································································ 30
Configuration procedure ····································································································· 30
Setting the timeout factor ··········································································································· 31
Configuring the BPDU transmission rate ······················································································· 31
Configuring edge ports ·············································································································· 32
Configuration restrictions and guidelines ················································································ 32
Configuration procedure ····································································································· 32
Configuring path costs of ports ···································································································· 32
Specifying a standard for the device to use when it calculates the default path cost ························· 32
Configuring path costs of ports ····························································································· 35
Configuration example ········································································································ 35
Configuring the port priority ········································································································ 36
Configuring the port link type ······································································································ 36
Configuration restrictions and guidelines ················································································ 36
Configuration procedure ····································································································· 36
Configuring the mode a port uses to recognize and send MSTP frames ··············································· 37
Enabling outputting port state transition information ········································································· 37
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