Case 6401 - Configuring Igmp

Case Communications 6401 Rugged ADSL Router Manual – Rev 1.5
SECTION 5 – ADVANCED CONFIGURATION Page 5.72
5.18.2 CONFIGURING IGMP
On entering the Multicast option the web page displays a table with default options.
Configuring
Default
Options
Default Version
3
There are three versions of IGMP, V1, V2, and V3
Query Interval
(In seconds)
125
The query interval is the amount of time in seconds between
IGMP General Query messages sent by the router (if the router is
the querier on this subnet). You can also click the scroll arrows to
select a new setting. The default query interval is 125 seconds
Query Response
Interval (In Seconds)
10
The query response interval is the maximum amount of time in
seconds that the IGMP router waits to receive a response to a
General Query message. The query response interval is the
Maximum Response Time field in the IGMP v2 Host
Membership Query message header. You can also click the scroll
arrows to select a new setting. The default query response
interval is 10 seconds and must be less than the query interval.
Last Member Query
Interval (Seconds)
10
The last member query interval is the amount of time in seconds
that the IGMP router waits to receive a response to a Group-
Specific Query message. The last member query interval is also
the amount of time in seconds between successive Group-
Specific Query messages.. The default last member query
interval is 1 second
Robustness Value
2
The robustness variable is a way of indicating how susceptible
the subnet is to lost packets. IGMP can recover from robustness
variable minus 1 lost IGMP packets. You can also click the scroll
arrows to select a new setting. The robustness variable should be
set to a value of 2 or greater. The default robustness variable
value is 2
Maximum Multicast
Data Sources for
(IGMPv3) (1 -24)
10
This field specifies the number of source addresses present in the
Query. For General and Group-Specific Queries, this value is
zero. For Group-and-Source-Specific Queries, this value is non-
zero, but limited by the network's MTU.
Maximum Multicast
Group Members
25
The Maximum number of members allowed in the multicast
group
Fast Leave Enable
Tick
Then the router will treat these groups as having single host
member. After the reception of a Leave message, the router
immediately removes the multicast forwarding state
LAN to LAN (Intra
LAN) Multicast
Enable
Tick
Tick to enable multicast