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IP Multicast Routing Protocol
The functions supporting IP multicasting are added under the IP Multicast Routing Protocol folder, from the Layer 3 IP Networking folder.
IGMP Snooping,DVMRP,and PIM-DM can be enabled or disabled on the Switch without changing the individual protocol’s configuration.
IGMP Interface Configuration
The Internet Group Multicasting Protocol (IGMP) can be configured on the Switch on a per-IP interface basis.To view the IGMP Interface Table,open the
IP Multicast Routing Protocol folder under Configuration and click IGMP Interface Settings.Each IP interface configured on the Switch is
displayed in the below
IGMP Interface Table dialog box.To configure IGMP for a particular interface, click the corresponding hyperlink for that IP interface.
This will open another
IGMP Interface Configuration window:
Figure 6- 130.IGMP Interface Table
Figure 6- 131.IGMP Interface Configuration window
This window allows the configuration of IGMP for each IP interface configured on the Switch.IGMP can be configured as Version 1 or 2 by toggling the
Version
field using the pull-down menu.The length of time between queries can be varied by entering a value between 1 and 65,535 seconds in the Query Interval
field.The maximum length of time between the receipt of a query and the sending of an IGMP response report can be varied by entering a value in the Max
Response Time
field.
The Robustness V
a
riable
field allo
ws IGMP to be
‘tuned’ for sub-networks that are expected to lose a lot of packets.A high value (max.255) for the
robustness variable will help compensate for ‘lossy’ sub-networks.A low value (min.2) should be used for less ‘lossy’ sub-networks.
The following fields can be set:
Parameter Description
Interface Name
Displays the name of the IP interface that is to be configured for IGMP.This must be a previously configured IP
interface.
IP Address Displays the IP address corresponding to the IP interface name above.
Version Enter the IGMP version (1 or 2) that will be used to interpret IGMP queries on the interface.
Query Interval Allo
ws the entr
y of a value betw
een
1 and 65535 seconds,
with a default of 125 seconds.
This specifies the
length of time between sending IGMP queries.
Max Response Time Sets the maximum amount of time allowed before sending an IGMP response report.A value between 1 and 25
seconds can be entered,with a default of 10 seconds.
Robustness Variable A tuning variable to allow for subnetworks that are expected to lose a large number of packets.A value
between 2 and 255 can be entered,with larger values being specified for subnetworks that are expected to lose
larger n
umbers of pack
ets.
Last Member Query Interval Specifies the maxim
um amount of time betw
een gr
oup-specific quer
y messages,
including those sent in
r
esponse to lea
ve group messages.A value between 1 and 25.The default is 1 second.
State This field can be toggled betw
een Enabled and Disabled and enables or disables IGMP f
or the IP interface.The
default is Disabled.
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Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch