Moxa EDS-518E-4GTXSFP-T [63/116] Multicast filtering and moxa s industrial rackmount switches

Managed Ethernet Switch (UI_2.0_FW_5.x) Featured Functions

3-50

Network without multicast filtering

All hosts receive the multicast

traffic, even if they don’t need it.

Network with multicast filtering

Hosts only receive dedicated

traffic from other hosts belonging

to the same group.

Multicast Filtering and Moxa’s Industrial Rackmount Switches

There are three ways to achieve multicast filtering with a Moxa switch: IGMP (Internet Group Management

Protocol) Snooping, GMRP (GARP Multicast Registration Protocol), and adding a static multicast MAC manually

to filter multicast traffic automatically.

Snooping Mode

Snooping Mode allows your switch to forward multicast packets only to the appropriate ports. The switch

snoops on exchanges between hosts and an IGMP device, such as a router, to find those ports that want to join

a multicast group, and then configures its filters accordingly.

Query Mode

Query mode allows the Moxa switch to work as the Querier if it has the lowest IP address on the subnetwork to

which it belongs.

NOTE

IGMP Snooping Enhanced mode is only provided in Layer 2 switches.

IGMP querying is enabled by default on the Moxa switch to ensure that query election is activated. Enable query

mode to run multicast sessions on a network that does not contain IGMP routers (or queriers). Query mode

allows users to enable IGMP snooping by VLAN ID. Moxa switches support IGMP snooping version 1, version 2,

and version 3. Version 2 is compatible with version 1.The default setting is IGMP V1/V2.

NOTE

Moxa Layer 3 switches are compatible with any device that conforms to the IGMP v2 and IGMP v3 device

protocols. Layer 2 switches only support IGMP v1/v2.