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stop
s forwarding data and the designated port of the upstream switch begins to forward
data.
The condition for the designated port to transit its port state rapidly: The designated port is
an edge port or connecting to a point-to-point link. If the designated port is an edge port, it
can directly transit to forwarding state; if the designated port is connecting to a
point-to-point link, it can transit to forwarding state after getting response from the
downstream switch through handshake.
RSTP Elements
Edge Port: Indicates the port connected directly to terminals.
P2P Link: Indicates the link between two switches directly connected.
MSTP (Multiple Spanning Tree Protocol), compatible with both STP and RSTP and subject to IEEE
802.1s standard, not only enables spanning trees to converge rapidly, but also enables packets of
different VLANs to be forwarded along their respective paths so as to provide redundant links
with a better load-balancing mechanism.
Features of MSTP:
MSTP combines VLANs and spanning tree together via VLAN-to-instance mapping table. It
binds several VLANs to an instance to save communication cost and network resources.
MSTP divides a spanning tree network into several regions. Each region has several
internal spanning trees, which are independent of each other.
MSTP provides a load-balancing mechanism for the packets transmission in the VLAN.
MSTP is compatible with both STP and RSTP.
MSTP Elements
MST Region (Multiple Spanning Tree Region): An MST Region comprises switches with the same
region configuration and VLAN-to-Instances mapping relationship.
IST (Internal Spanning Tree): An IST is a spanning tree in an MST.
CST (Common Spanning Tree): A CST is the spanning tree in a switched network that connects all
MST regions in the network.
CIST (Common and Internal Spanning Tree): A CIST, comprising IST and CST, is the spanning
tree in a switched network that connects all switches in the network.
The following figure shows the network diagram in MSTP.
52
Содержание
- Gigabit smart switch 1
- Tl sg2216 tl sg2424 1
- Ce mark warning 2
- Copyright trademarks 2
- Fcc statement 2
- Safety notices 2
- Package contents 8
- Chapter 1 about this guide 9
- Conventions 9
- Intended readers 9
- Overview of this guide 9
- Appearance description 12
- Chapter 2 introduction 12
- Front panel 12
- Main features 12
- Overview of the switch 12
- Rear panel 13
- Chapter 3 login to the switch 15
- Configuration 15
- Chapter 4 system 17
- System info 17
- System summary 17
- Device description 19
- System time 19
- Daylight saving time 20
- System ip 21
- User manage 22
- User table 22
- User config 23
- Config restore 24
- System tools 24
- Config backup 25
- Firmware upgrade 25
- System reboot 26
- System reset 26
- Access control 27
- Access security 27
- Chapter 5 switching 29
- Port config 29
- Port mirror 30
- The following entries are displayed on this screen 31
- Port security 32
- Port isolation 34
- Lag table 35
- Static lag 36
- Traffic monitor 37
- Traffic summary 37
- Traffic statistics 39
- Mac address 40
- Address table 41
- Static address 42
- Dynamic address 43
- Filtering address 45
- Chapter 6 vlan 47
- Q vlan 48
- Vlan config 50
- Port config 52
- Configuration procedure 53
- Application example for 802 q vlan 54
- Chapter 7 spanning tree 56
- Stp config 61
- Port config 63
- Stp summary 63
- Mstp instance 65
- Region config 65
- Instance config 66
- Instance port config 67
- Global configuration procedure for spanning tree function 69
- Port protect 69
- Stp security 69
- Application example for stp function 72
- Tc protect 72
- Chapter 8 multicast 76
- Igmp snooping 78
- Snooping config 79
- Port config 80
- Vlan config 81
- Configuration procedure 83
- Multicast vlan 83
- Application example for multicast vlan 85
- Configuration procedure 85
- Multicast filter 86
- Ip range 87
- Port filter 87
- Configuration procedure 89
- Packet statistics 89
- Chapter 9 qos 91
- Diffserv 94
- Port priority 94
- Configuration procedure 95
- Schedule mode 95
- Configuration procedure 96
- Dscp priority 96
- P priority 96
- Configuration procedure 97
- Bandwidth control 98
- Rate limit 98
- Storm control 99
- Chapter 10 snmp 101
- Global config 103
- Snmp config 103
- Snmp group 104
- Snmp view 104
- Snmp user 106
- Snmp community 107
- Configuration procedure 109
- Notification 110
- History control 112
- Alarm config 113
- Event config 113
- Chapter 11 maintenance 116
- Cpu monitor 116
- System monitor 116
- Memory monitor 117
- Log table 118
- Local log 119
- Remote log 119
- Backup log 120
- Cable test 121
- Device diagnose 121
- Loopback 122
- Network diagnose 122
- Tracert 123
- Appendix a specifications 125
- Appendix b configuring the pcs 126
- Appendix c glossary 128
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