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Figure 7-2 Basic MSTP diagram
MSTP
MSTP divides a network into several MST regions. The CST is generated between these MST
regions, and multiple spanning trees can be generated in each MST region. Each spanning tree is
called an instance. As well as STP, MSTP uses BPDUs to generate spanning tree. The only
difference is that the BPDU for MSTP carries the MSTP configuration information on the switches.
Port States
In an MSTP, ports can be in the following four states:
Forwarding: In this status the port can receive/forward data, receive/send BPDU packets as
well as learn MAC address.
Learning: In this status the port can receive/send BPDU packets and learn MAC address.
Blocking: In this status the port can only receive BPDU packets.
Disconnected: In this status the port is not participating in the STP.
Port Roles
In an MSTP, the following roles exist:
Root Port: Indicates the port that has the lowest path cost from this bridge to the Root Bridge
and forwards packets to the root.
Designated Port: Indicates the port that forwards packets to a downstream network segment
or switch.
Master Port: Indicates the port that connects a MST region to the common root. The path
from the master port to the common root is the shortest path between this MST region and
the common root.
Alternate Port: Indicates the port that can be a backup port of a root or master port.
Backup Port: Indicates the port that is the backup port of a designated port.
Disabled: Indicates the port that is not participating in the STP.
The following diagram shows the different port roles.
67
- TL-SG2424P 1
- 4 Combo SFP Slots 1
- COPYRIGHT & TRADEMARKS 2
- FCC STATEMENT 2
- CE Mark Warning 2
- Safety Information 3
- Package Contents 9
- Chapter 1 About this Guide 10
- Chapter 2 Introduction 13
- 2.3 Appearance Description 14
- 2.3.2 Rear Panel 15
- 3.1 Login 16
- 3.2 Configuration 16
- Chapter 4 System 18
- Port Info 19
- 4.1.2 Device Description 20
- 4.1.3 System Time 20
- 4.1.4 Daylight Saving Time 21
- 4.1.5 System IP 23
- 4.2 User Management 24
- User Info 25
- User Table 25
- 4.3 System Tools 26
- 4.3.3 Firmware Upgrade 27
- 4.4 Access Security 28
- 4.4.1 Access Control 29
- 4.4.2 SSL Config 30
- 4.4.3 SSH Config 31
- Global Config 32
- Key Download 32
- Chapter 5 Switching 37
- 5.1.2 Port Mirror 38
- Figure 5-3 Mirroring Port 39
- 5.1.3 Port Security 40
- Port Security 41
- 5.1.4 Port Isolation 42
- 5.1.5 Loopback Detection 43
- 5.2 LAG 44
- 5.2.1 LAG Table 45
- 5.2.2 Static LAG 46
- 5.2.3 LACP Config 47
- LACP Config 48
- 5.3 Traffic Monitor 49
- 5.3.2 Traffic Statistics 50
- Statistics 51
- 5.4 MAC Address 52
- 5.4.1 Address Table 53
- 5.4.2 Static Address 54
- 5.4.3 Dynamic Address 55
- 5.4.4 Filtering Address 57
- 5.5 DHCP Filtering 58
- DHCP Cheating Attack 60
- DHCP Filtering 61
- Trusted Port 61
- Chapter 6 VLAN 62
- 6.1 802.1Q VLAN 63
- PVID 64
- 6.1.1 VLAN Config 65
- VLAN Config 66
- VLAN Members 66
- 6.1.2 Port Config 67
- VLAN of Port 68
- Configure switch A 70
- Configure switch B 70
- Chapter 7 Spanning Tree 71
- STP Timers 72
- STP Generation 73
- In the beginning 73
- Comparing BPDUs 73
- Selecting the root bridge 73
- 7.1 STP Config 76
- Parameters Config 77
- 7.2 Port Config 78
- Port Config 79
- 7.3 MSTP Instance 80
- 7.3.2 Instance Config 81
- 7.3.3 Instance Port Config 82
- 7.4 STP Security 84
- Root Protect 85
- TC Protect 85
- BPDU Protect 85
- BPDU Filter 85
- Port Protect 86
- 7.4.2 TC Protect 87
- Configure switch A: 88
- Configure switch B: 88
- Configure switch C: 89
- Configure switch D: 89
- Chapter 8 Multicast 91
- Multicast Address 92
- Multicast Address Table 92
- 8.1 IGMP Snooping 93
- 8.1.1 Snooping Config 94
- 8.1.2 Port Config 95
- 8.1.3 VLAN Config 96
- VLAN Table 97
- 8.1.4 Multicast VLAN 98
- Configuration procedure: 99
- Network Requirements 100
- Network Diagram 100
- Configuration Procedure 100
- 8.2 Multicast IP 101
- 8.2.2 Static Multicast IP 102
- 8.3 Multicast Filter 103
- 8.3.2 Port Filter 104
- Port Filter Config 105
- 8.4 Packet Statistics 106
- IGMP Statistics 107
- Chapter 9 QoS 108
- 9.1 DiffServ 111
- 9.1.2 DSCP Priority 112
- 9.1.3 802.1P/CoS mapping 113
- 9.1.4 Schedule Mode 114
- 9.2 Bandwidth Control 115
- 9.2.2 Storm Control 116
- 9.3 Voice VLAN 118
- 9.3.1 Global Config 120
- 9.3.2 Port Config 120
- Figure 9-13 Port Config 121
- 9.3.3 OUI Config 122
- Chapter 10 PoE 124
- 10.1.1 PoE Config 125
- 10.1.2 PoE Profile 126
- 10.2 PoE Time-Range 127
- Create Time-Range 128
- Create Time-Slice 128
- 10.2.3 PoE Holiday Config 129
- Chapter 11 SNMP 130
- MIB Introduction 131
- 11.1 SNMP Config 132
- 11.1.2 SNMP View 133
- 11.1.3 SNMP Group 134
- 11.1.4 SNMP User 135
- 11.1.5 SNMP Community 137
- Configuration Procedure: 138
- 11.2 Notification 139
- 11.3 RMON 141
- 11.3.1 History Control 142
- 11.3.2 Event Config 142
- 11.3.3 Alarm Config 143
- Chapter 12 LLDP 146
- 12.1 Basic Config 150
- 12.1.2 Port Config 151
- 12.2 Device Info 152
- 12.3 Device Statistics 153
- Auto Refresh 154
- Global Statistics 154
- Neighbor Statistics 154
- 12.4 LLDP-MED 155
- 12.4.1 Global Config 156
- 12.4.2 Port Config 156
- LLDP-MED Port Config 157
- 12.4.3 Local Info 158
- 12.4.4 Neighbor Info 159
- Neighbor Info 160
- Chapter 13 Maintenance 161
- 13.2 Log 162
- 13.2.1 Log Table 163
- 13.2.2 Local Log 164
- 13.2.3 Remote Log 165
- 13.2.4 Backup Log 165
- 13.3 Device Diagnostics 166
- 13.3.2 Loopback 167
- 13.4 Network Diagnostics 168
- Tracert Config 169
- Appendix A: Specifications 170
- Appendix C: Glossary 173
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