xStack® DGS-3120 Series Layer 3 Managed Gigabit Ethernet Switch Web UI Reference Guide
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IGMP Access Control Settings
Users can set IGMP authentication, otherwise known as IGMP access control, on individual ports on the Switch.
When the
Authentication State
is
Enabled
, and the Switch receives an IGMP join request, the Switch will send
the access request to the RADIUS server to do the authentication.
IGMP authentication processes IGMP reports as follows: When a host sends a join message for the interested
multicast group, the Switch has to do authentication before learning the multicast group/port. The Switch sends an
Access-Request to an authentication server and the information including host MAC, switch port number, switch IP,
and multicast group IP. When the Access-Accept is answered from the authentication server, the Switch learns the
multicast group/port. When the Access-Reject is answered from the authentication server, the Switch won’t learn
the multicast group/port and won’t process the packet further. The entry (host MAC, switch port number, and
multicast group IP) is put in the “authentication failed list.” When there is no answer from the authentication server
after T1 time, the Switch resends the Access-Request to the server. If the Switch doesn’t receive a response after
N1 times, the result is denied and the entry (host MAC, switch port number, multicast group IP) is put in the
“authentication failed list.” In general case, when the multicast group/port is already learned by the switch, it won’t
do the authentication again. It only processes the packet as standard.
IGMP authentication processes IGMP leaves as follows: When the host sends leave message for the specific
multicast group, the Switch follows the standard procedure for leaving a group and then sends an Accounting-
Request to the accounting server for notification. If there is no answer from the accounting server after T2 time, the
Switch resends the Accounting-Request to the server. The maximum number of retry times is N2.
To view this window, click
Security > IGMP Access Control Settings
as shown below:
Figure 8-57 IGMP Access Control Settings
The fields that can be configured are described below:
Parameter
Description
Unit
Select the unit you want to configure.
(EI and SI Mode Only)
From Port / To Port
Use the drop-down menus to select a range of ports to be enabled as compound
authentication ports.
State
Use the drop-down menu to enable or disable the authentication state.
Click the
Apply
button to accept the changes made.
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