D-Link DGS-3324SR, User Manual, Page: 299 / 392

xStack DGS/DXS-3300 Series Layer 3 Stackable Gigabit Ethernet Switch User Manual
284
Parameter Description
IGMP Group Detail
Interface Name Defines the interface name of the reporting multicast group.
Multicast Group The IP address of the reporting Multicast Group.
Last Reporter IP The IP address of the host member of the multicast group to last report being a
member of that group.
Querier IP The IP Address of a selected multicast router, which is designated to query host
interfaces about their multicast reception state.
Expire Time The length of time, in seconds, until the entry will change filter mode from exclude to
include. If the filter is in include mode, this timer will display 0. If the filter is in exclude
mode, this timer will be counting down to zero from a pre-calculated figure based on
the users implementation of IGMP.
Group Filter Mode The filter mode of the multicast group. The purpose of the filter mode is to reduce the
reception state of a multicast group so that all members of the multicast group are
satisfied. This filter mode is dependant on membership reports and timers of the
group. There are two possibilities:
exclude – In exclude mode, the host is excluding packets from the SSM and therefore
does not desire traffic from the source. This timer will be updated upon the reception
of a group report packet. If no group report packet is received, the timer will expire
and the filter mode will change to include. If a group report is received, the timer will
be updated and packets will continue to be denied.
include – This state denotes that members are accepting packets from the SSM
(Specific Source Multicast). Once in include mode, source timers will start counting
down until a group report is received which has information pertaining to the source. If
no group report packet is received, all source timers will time out and the group record
is deleted.
V1 Host Timer This timer is based on a host within the multicast group that is running IGMPv1.
Receiving a group report from an IGMPv1 host within the multicast group will refresh
the timer. If no IGMPv1 host is a member of the multicast group, this field will always
read 0.
V2 Host Timer This timer is based on a host within the multicast group that is running IGMPv2.
Receiving a group report from an IGMPv2 host within the multicast group will refresh
the timer. If no IGMPv2 host is a member of the multicast group, this field will always
read 0.
Source List Table
Source Address Displays the IP address of the SSM (Source Specific Multicast).
Timer The timer for the source address (SSM). If the multicast group receives group reports
from a host, the timer will be refreshed. If no group reports are received by the source,
the timer will expire and the source record will be deleted from the Switch.
NOTE: All timers within the preceding window can be determined using IGMP
configurations to perform the following calculation:
(Group Membership Interval x Robustness Variable) + One Query Response Interval