Allied Telesis AT-9724TS IP Multicast Routing Protocol, Igmp Interface Configuration, 129

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-DMcan 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 Variable field allows 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:

ParameterDescription

Interface Name

IP Address

Version

Query Interval

Max Response Time

Robustness Variable

Last Member Query Interval State

Displays the name of the IP interface that is to be configured for IGMP.This must be a previously configured IP interface.

Displays the IP address corresponding to the IP interface name above.

Enter the IGMP version (1 or 2) that will be used to interpret IGMP queries on the interface.

Allows the entry of a value between 1 and 65535 seconds, with a default of 125 seconds.This specifies the length of time between sending IGMP queries.

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.

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 numbers of packets.

Specifies the maximum amount of time between group-specific query messages, including those sent in response to leave group messages.A value between 1 and 25.The default is 1 second.

This field can be toggled between Enabled and Disabled and enables or disables IGMP for the IP interface.The default is Disabled.

Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch 129