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724-746-5500 | blackbox.com
Page 81
LGB5028A User‘s Manual
Chapter 6: Configuration
Port Members: Ports under this group.
Auto-refresh: Check the box next to auto-refresh and the device will refresh the log automatically.
Upper right icon (Refresh, <<, >> ): Click the “Refresh” button to refresh the IGMP Group Status manually, or use the “<<”
and “ >>” to go to the next/previous page or entry.
6.5.6 IPv4 SSM Information
Source Specific Multicast (SSM) is a datagram delivery model that best supports one-to-many applications, also known as
broadcast applications. SSM is a core network technology of IP multicast targeted for audio and video broadcast application
environments.
For the SSM delivery mode, an IP multicast receiver host must use IGMP Version 3 (IGMPv3) to subscribe to channel (S, G). By
subscribing to this channel, the receiver host is indicating that it wants to receive IP multicast traffic sent by source host S to group
G. The network will deliver IP multicast packets from source host S to group G to all hosts in the network that have subscribed to
the channel (S, G).
SSM does not require group address allocation within the network, only within each source host. Different applications running
on the same source host must use different SSM groups. Different applications running on different source hosts can arbitrarily
reuse SSM group addresses without causing any excess traffic on the network.
Addresses in the range 232.0.0.0/8 (232.0.0.0 to 232.255.255.255) are reserved for SSM by International Assigned Numbers
Authority (IANA). In the switch, you can configure SSM for arbitrary IP multicast addresses also.
Web Interface
To display the IGMPv3 IPv4 SSM Information in the Web interface:
1. Click “Configuration,” “IGMP Snooping,” “IPv4 SSM Information.”
2. Check the box next to auto-refresh to automatically refresh the information.
3. Click the “Refresh” button to refresh an entry of the IGMPv3 IPv4 SSM Information.
4. Click “<< or >> ” to move to previous or next entry.
Figure 6-31. The IGMPv3 Information screen.
Parameter Description
Navigating the IGMPv3 Information Table
Each page shows up to 99 entries from the IGMPv3 SSM (Source Specific Multicast) Information table; the default is 20, selected
through the “entries per page” input field.
When first visited, the Web page will show the first 20 entries from the beginning of the IGMPv3 Information Table.
The “Start from VLAN” and “Group” input fields allow the user to select the starting point in the IGMPv3 Information Table.
Clicking the button will update the displayed table starting from that or the next closest IGMPv3 Information Table match. In
addition, the two input fields will—upon a button click—assume the value of the first displayed entry, allowing for continuous
refresh with the same start address.