Igmp Interface Settings - D-Link xStack DGS-3620 Series Reference Manual

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xStack DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch Web UI Reference Guide
Source timers are used to keep sources present and active within a multicast group on the Switch. These source
timers are refreshed if a group report packet is received by the Switch, which holds information pertaining to the
active source group record part of a report packet. If the filter mode is exclude, traffic is being denied from at least
one specific source, yet other hosts may be accepting traffic from the multicast group. If the group timer expires for
the multicast group, the filter mode is changed to include and other hosts can receive traffic from the source. If no
group report packet is received and the filter mode is include, the Switch presumes that traffic from the source is no
longer wanted on the attached network and the source record list is then deleted after all source timers expire. If
there is no source list record in the multicast group, the multicast group will be deleted from the Switch.
Timers are also used for IGMP version 1 and 2 members, which are a part of a multicast group when the Switch is
running IGMPv3. This timer is based on a host within the multicast group that is running IGMPv1 or v2. Receiving a
group report from an IGMPv1 or v2 host within the multicast group will refresh the timer and keep the v1 and/or v2
membership alive in v3.
NOTE: The length of time for all timers utilized in IGMPv3 can be determined using
IGMP configurations to perform the following calculation:
(Query Interval x Robustness Variable) + One Query Response Interval

IGMP Interface Settings

The Internet Group Management Protocol (IGMP) can be configured on the Switch on a per-IP interface basis.
Each IP interface configured on the Switch is displayed in the below IGMP Interface Settings window.
To view the following window, click L3 Features > IP Multicast Routing Protocol > IGMP > IGMP Interface
Settings, as shown below:
Figure 6-91 IGMP Interface Settings window
Click the Edit button to re-configure the specific entry.
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