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EDS-508 Series User’s Manual Featured Functions
3-42
Multicast Filtering and MOXA EtherDevice Switch
Your Switch uses IGMP (Internet Group Management Protocol) Snooping to provide support for
automatic multicast filtering. It also supports IGMP query mode.
Snooping Mode
Snooping Mode allows your Switch to forward multicast packets only to the appropriate ports. The
Switch “snoops” on exchanges between end-stations and an IGMP device, typically a router, to
find those ports that would like to join a multicast group, and then sets its filters accordingly.
Query Mode
Query mode allows the Switch to function as the Querier if it has the lowest IP address in the
subnetwork to which it belongs. IGMP querying is enabled by default on the EDS. This helps
prevent interoperability issues with some multicast routers that may not follow the lowest IP
address election method. Enable query mode if you wish to run multicast sessions on a network
that does not contain any IGMP routers (or queriers).
NOTE
EDS is compatible with any device that conforms to the IGMP v2 and IGMP v3 protocol.
IGMP Multicast Filtering
IGMP is the system that all IP-supporting network devices use to register end-stations with
multicast groups. It can be used on all LANs and VLANs that contain a multicast capable IP router,
and on other network devices that support multicast filtering. It works as follows:
1. The IP router (or querier) periodically sends query packets to all the end-stations in the LANs
or VLANs that are connected to it. If your network has more than one IP router, then the one
with the lowest IP address becomes the querier. The Switch can be the IGMP querier and will
become so if its own IP address is lower than that of any other IGMP queriers connected to
the LAN or VLAN.
2. When an IP end-station receives a query packet, it sends a report packet back that identifies
the multicast group that the end-station would like to join.
3. When the report packet arrives at a port on a Switch with IGMP Snooping enabled, the Switch
learns that the port is to forward traffic for the multicast group and then forwards the packet to
the router.
4. When the router receives the report packet, it registers that the LAN or VLAN requires traffic
for the multicast groups.
5. When the router forwards traffic for the multicast group to the LAN or VLAN, the Switch
units only forward the traffic to ports that received a report packet.
Enabling IGMP Snooping
You can enable or disable IGMP Snooping and IGMP querying using the serial console or the
Web interface. If IGMP Snooping is not enabled then IP multicast traffic is always forwarded.
That is, it floods the network.
Configuring Multicast Filtering
IGMP (Internet Group Management Protocol) is important in industrial networking, and may be
used with some field bus protocols over Ethernet such as Allen-Bradley, EtherNet/IP, Siemens
Profibus, and Foundation Fieldbus HSE (High Speed Ethernet). These industrial Ethernet
protocols use publisher/subscriber communications models by multicasting packets that could
- EDS-508 Series 1
- User’s Manual 2
- Table of Contents 3
- Introduction 5
- MOXA EtherDevice™ Switch 6
- Package Checklist 6
- Features 7
- Getting Started 9
- Using the Telnet Console 12
- Using Web Configuration 14
- Featured Functions 17
- Configuring Basic Settings 18
- Password 19
- Accessible IP 20
- Enable/Disable Port 21
- Port Transmission Speed 22
- Port Type 22
- FDX Flow Control 22
- Network 23
- DNS IP Address 24
- Using Port Trunking 28
- Configuring Port Trunking 29
- Using SNMP 30
- Configuring SNMP 31
- SNMP Read/Write Settings 31
- Private MIB information 33
- The Concept of Turbo Ring 33
- Configuring Turbo Ring 37
- The Concept of STP/RSTP 38
- What is STP? 39
- How STP Works 40
- How RSTP Differs from STP 41
- STP Example 42
- Configuring STP/RSTP 43
- Using Traffic Prioritization 46
- QoS Classification 48
- CoS Mapping 50
- TOS/DiffServ Mapping 50
- Using Virtual LAN 51
- The Management VLAN 52
- Communication Between VLANs 52
- Configuring 802.1Q VLAN 54
- Using Multicast Filtering 56
- Multicast Filtering 57
- IGMP Multicast Filtering 58
- Enabling IGMP Snooping 58
- Using Rate Limiting 60
- Configuring Rate Limiting 61
- Using Port Lock 62
- Using Auto Warning 63
- Email Alarm Events Settings 64
- Email Settings 65
- Configuring Relay Warning 66
- Relay Alarm Events Settings 67
- Relay Alarm List 68
- Using Set Device IP 69
- Configuring Set Device IP 70
- Using Diagnosis 71
- Using Monitor 72
- Monitor by Port 73
- Using the MAC Address Table 74
- Using Event Log 75
- EDS Configurator GUI 77
- Starting EDS Configurator 78
- Broadcast Search 78
- Search by IP address 79
- Upgrade Firmware 80
- Modify IP Address 80
- Export Configuration 81
- Import Configuration 82
- Unlock Server 83
- MIB Groups 85
- Specifications 87
- Service Information 89
- MOXA Internet Services 90
- Problem Report Form 91
- MOXA EDS-508 Series 91
- Product Return Procedure 92
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