Contemporary Control Systems Compact Managed Switches Software Manual for Web Browser - Manual (Page 31)

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4.4.6 Configure Multicast Filtering
A multicast message is one destined for two or more Ethernet devices. By default, the
switch transmits such a message over all of its ports. However, the switch can filter up
to ten multicast addresses so that messages sent to these addresses will only exit the
switch via certain designated ports. The switch also supports IGMP Snooping which
allows automatic filtering of multicast messages for devices that support multicasting as
described in Section 4.4.12. The screen of Figure 25 is for an 8-port switch. A screen
for a 16- or 24-port model would function the same but display more ports. The user
must enter the multicast MAC Address to represent each multicast group, the Ports that
will carry messages to that group and the Priority of those messages. By default, each
address is assigned a Priority of “Low”.
Figure 25 — Configure Multicast Filtering for an 8-port Model
When defining or editing a group, the “Apply” button must be clicked to register settings
for that group — before editing another group or refreshing the screen — or the edits
will be lost. When editing many addresses per session, many browser screens will
accumulate in the browser’s history — thus, proceeding to another switch function is
best done with the onscreen navigation links, instead of the browser’s “back” button.
For an address to be accepted as a valid
multicast
address, its second digit must be odd. If the second
digit is even, the error screen of Figure 26 will result.
Figure 26 — Not a Multicast Address