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78 ZT8101 User’s Guide
Using the Telnet Console
To configure IGMP for an IP interface
1. From the Main Menu, select Layer 3 - IP Networking Setup | IGMP Interface
Configurations and press Enter.
2. Configure these fields.
3. Highlight APPLY and press Enter.
Note: When IGMP is enabled on an interface, the switch IGMP snooping flag is set to Enabled and
becomes a read-only parameter.
DVMRP Interface Configuration
The Distance Vector Multicast Routing Protocol (DVMRP) is a hop-based method of building
multicast delivery trees from multicast sources to all nodes of a network. Because the delivery trees
are “pruned” and use the “shortest path,” DVMRP is relatively efficient. Because multicast group
membership information is forwarded by a distance-vector algorithm, propagation is slow.
DVMRP is optimized for high delay (high latency) and relatively low-bandwidth networks, and it
can be considered as a “best-effort” multicasting protocol.
To configure DVMRP for an IP interface
1. From the Main Menu, select Layer 3 - IP Networking Setup | DVMRP Interface
Configurations and press Enter.
2. Configure these fields.
Field Description
Interface Name
Specifies the name of the IP interface you want to configure. The IP address
field displays the address which corresponds to the entered IP interface.
Version
Specifies the version number of IGMP to be used with the IP interface. Use
the spacebar to toggle between 1 and 2.
Query Interval
Specifies the time (in seconds) between the transmission of IGMP query
packets. Enter a value between 1—65535 seconds. The default is 125.
Max Response Time
Specifies the maximum time the switch can wait for reports from members.
Enter a value between 1—25. The default is 10 seconds.
Robustness Variable
Specifies the permitted packet loss on a link. Enter a value between 1—255.
The default is 2.
State Enables or disables IGMP on this IP interface.
Field Description
Interface Name
Specifies the name of the interface to configure. This must be a previously
defined IP interface.
Neighbor Timeout Interval
Specifies the maximum interval the switch will wait to hear from a neighbor.
If this interval expires, the switch assumes that this neighbor is down. Enter
a value from 1—65535. The default is 35.
Probe Interval
Specifies the interval between probes. A probe is a query to other routers to
determine if a multicast group is present on a given router subnetwork.
Enter a value from 1—65535 seconds. The default is 10.