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3-5.6 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
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. If you want to auto-refresh the information, check the “Auto-refresh” box.
3. Click “ Refresh“ to refresh a entry of the IGMPv3 IPv4 SSM Information.
4. Click “<< or >> “ to move to the previous or next entry.
Figure 3-6.6: The IGMPv3 IPv4 SSM Information.
Parameter description:
Navigating the IGMPv3 Information Table
Each page shows up to 99 entries (the default is 20) from the IGMPv3 SSM (Source
Specific Multicast) Information table 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 IGMPv3 Information Table match. In addition, the two input fields
will—when you click a button—assume the value of the first displayed entry, allowing for
continuous refresh with the same start address.
The will use the last entry of the currently displayed table as a basis for the next lookup.
When the end is reached the text "No more entries" is shown in the displayed table. Use
the button to start over.
IGMPv3 Information Table Columns
VLAN ID :
VLAN ID of the group.
Group :
Group address of the group displayed.