Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 183 of 669
Compatibility
Select
IGMP-Auto
,
Forced IGMPv1
,
Forced IGMPv2
, or
Forced IGMPv3
. Compatibility is
maintained by hosts and routers taking appropriate actions depending on the versions of IGMP
operating on hosts and routers within a network. The default value is
IGMP-Auto
.
IGMP-Auto
: Compatibility is automatically assigned (default).
Forced IGMPv1
: Compatibility is forced to IGMP version 1.
Forced IGMPv2
: Compatibility is forced to IGMP version 2.
Forced IGMPv3
: Compatibility is forced to IGMP version 3.
Three versions of IGMP exist - versions v1, v2, and v3. One difference between the versions is how a
host node signals that it no longer wants to be a member of a multicast group. In IGMP v1, the host
node stops sending reports. If a router does not receive a report from a host node after a predefined
length of time (time-out value) it assumes that the host node no longer wants to receive multicast
frames and removes it from the membership list of the multicast group. In version 2, a host node exits
from a multicast group by sending a leave request. After receiving a leave request from a host node,
the router removes the node from appropriate membership list. The router also stops sending
multicast packets from the port if it determines there are no further host nodes on the port. Version 3
adds the ability of host nodes to "join" or "leave" specific sources in a multicast group.
PRI
Priority of Interface; indicates the IGMP control frame priority level generated by the system. These
values can be used to prioritize different classes of traffic.
The allowed range is
0
(best effort) to
7
(highest priority). The default interface priority value is 0.
RV
Displays the Robustness Variable (RV) which allows tuning for the expected packet loss on a
network.
The valid range is
1
to
255.
The default robustness variable value is
2
.
QI (sec)
Displays the Query Interval. The Query Interval (QI) is the interval between General Queries sent by
the Querier. The valid range is
1
to
255
seconds. The default query interval is
125
seconds.
QRI (0.1 sec)
Displays the Query Response Interval. The Max Response Time used to calculate the Max Resp
Code inserted into the periodic General Queries. The valid range is
0
to
31744
in tenths of a second.
The default query response interval is
100
in tenths of a second (10 seconds).
LLQI (0.1 sec) (LMQI for IGMP)
Displays the Last Member Query Interval. The Last Member Query Time is the time value
represented by the Last Member Query Interval, multiplied by the Last Member Query Count. The
valid range is
0
to
31744
in tenths of a second. The default last member query interval is
10
in tenths
of a second (1 second).
URI (sec)
Displays the Unsolicited Report Interval. The Unsolicited Report Interval (URI) is the time between
repetitions of a host's initial report of membership in a group. The valid range is
0
to
31744
seconds.
The default unsolicited report interval is
1
second.
