Moxa EDS-510A-3GT User Manual Page 60
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EDS-510A Series User’s Manual Featured Functions
3-45
STP Example
The LAN shown in the following figure has three segments, with adjacent segments connected
using two possible links. The various STP factors, such as Cost, Root Port, Designated Bridge Port,
and Blocked Port are shown in the figure.
Bridge A
LAN Segment 3
LAN Segment 2
LAN Segment 1
Port 2
(Root Bridge)
Port 1
(Designated
Bridge Port)
Bridge B
Port 2
(Designated
Bridge Port)
Port 1
(Root Port)
Cost =100
Bridge X
Port 2
(Blocked Port)
Port 1
(Root Port)
Cost =100
Bridge C
Port 2
(Designated
Bridge Port)
Port 1
(Root Port)
Cost =100
Bridge Y
Port 2
(Blocked Port)
Port 1
(Root Port)
Cost =200
Bridge A has been selected as the Root Bridge, since it was determined to have the lowest
Bridge Identifier on the network.
Since Bridge A is the Root Bridge, it is also the Designated Bridge for LAN segment 1. Port 1
on Bridge A is selected as the Designated Bridge Port for LAN Segment 1.
Ports 1 of Bridges B, C, X, and Y are all Root Ports sine they are nearest to the Root Bridge,
and therefore have the most efficient path.
Bridges B and X offer the same Root Path Cost for LAN segment 2. However, Bridge B was
selected as the Designated Bridge for that segment since it has a lower Bridge Identifier. Port
2 on Bridge B is selected as the Designated Bridge Port for LAN Segment 2.
Bridge C is the Designated Bridge for LAN segment 3, because it has the lowest Root Path
Cost for LAN Segment 3:
The route through Bridges C and B costs 200 (C to B=100, B to A=100)
The route through Bridges Y and B costs 300 (Y to B=200, B to A=100)
The Designated Bridge Port for LAN Segment 3 is Port 2 on Bridge C.
- Moxa EtherDevice™ Switch 1
- Table of Contents 3
- Introduction 5
- Overview 6
- Package Checklist 6
- Features 6
- Getting Started 8
- Featured Functions 16
- Configuring Basic Settings 17
- Password 18
- Accessible IP 19
- Network 22
- Daylight Saving Time 25
- PTP Setting 28
- Turbo Ring DIP Switch 29
- Restart 34
- Factory Default 34
- Using Port Trunking 35
- Configuring Port Trunking 36
- Configuring SNMP 38
- SNMP Read/Write Settings 39
- Trap Settings 40
- Private MIB information 41
- Gigabit Turbo Ring 42
- Recovery Time < 50 ms 42
- The Turbo Ring Concept 43
- Segment N+1 44
- Ring Coupling Configuration 45
- Configuring “Turbo Ring” 48
- Configuring “Turbo Ring V2” 50
- The Turbo Chain Concept 53
- Configuring “Turbo Chain” 54
- Tail Switch Configuration 55
- The STP/RSTP Concept 56
- What is STP? 57
- How STP Works 58
- STP Example 60
- Configuring STP/RSTP 62
- Using Traffic Prioritization 64
- QoS Classification 67
- CoS Mapping 69
- TOS/DiffServ Mapping 69
- Using Virtual LAN 70
- Benefits of VLANs 71
- Managing a VLAN 71
- Communication between VLANs 71
- Configuring Virtual LAN 74
- VLAN Table 76
- Using Multicast Filtering 77
- Multicast Filtering 78
- IGMP Multicast Filtering 79
- Configuring IGMP Snooping 80
- Add Static Multicast MAC 82
- Configuring GMRP 83
- Using Bandwidth Management 84
- Using Port Access Control 85
- Configuring Static Port Lock 87
- Configuring IEEE 802.1X 87
- 802.1X Re-Authentication 89
- Local User Database Setup 89
- Using Auto Warning 90
- Configuring Email Warning 91
- Event Type 91
- Email Setup 93
- Configuring Relay Warning 94
- Event Setup 94
- Warning List 95
- Using Set Device IP 96
- Configuring Set Device IP 98
- Server IP Address 99
- DHCP Option 82 100
- DHCP Function Table 100
- Using Diagnosis 101
- LLDP Function Overview 102
- LLDP Web Interface 103
- LLDP Settings 103
- LLDT Table 103
- Using Monitor 104
- Using the MAC Address Table 105
- Using Event Log 106
- Using Syslog 107
- Using HTTPS/SSL 108
- EDS Configurator GUI 110
- Starting EDS Configurator 111
- Broadcast Search 111
- Search by IP address 112
- Upgrade Firmware 113
- Modify IP Address 114
- Export Configuration 114
- Import Configuration 116
- Unlock Server 117
- MIB Groups 119
- Modbus/TCP Map 122
- Port Information 123
- Packets Information 124
- Redundancy Information 124
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