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84 Intel® NetStructure™ ZT 8101 10/100 Ethernet Switch User’s Manual
Using the Telnet Console
2. Configure these fields.
3. Highlight
APPLY and press Enter.
Each protocol has a corresponding configuration screen. You access these screens from the
Layer
3 - IP Networking Setup
screen.
IGMP Configuration
The Internet Group Management Protocol (IGMP) allows the switch to forward multicast traffic
intelligently on the switch. The switch “snoops” the IGMP query and report messages and forwards
traffic only to the ports that request the multicast traffic. This prevents the switch from
broadcasting the traffic to all ports and possibly affecting network performance.
IGMP requires a network device that learns about the presence of multicast groups on its subnets
and that keeps track of group membership. Multicasting is not connection oriented, so data is
delivered to the requesting hosts on a best-effort level of service.
The switch has two configuration screens for IGMP:
• The IGMP snooping screen allows you to configure the switch for snooping and querying.
• The IGMP interface screen allows you to configure the switch to keep track of IGMP groups.
To configure IGMP snooping
1. From the Main Menu, select Layer 3 - IP Networking Setup | IGMP Snooping
Configurations
and press Enter.
Field Description
Switch IGMP Snooping
Enables or disables, globally, Internet Group Management Protocol
(IGMP) snooping. This protocol allows the switch to forward
multicast traffic intelligently on the switch.
DVMRP State
Enables or disables, globally, the Distance-Vector Multicast Routing
Protocol (DVMRP).
PIM-DM State
Enables or disables, globally, the Protocol Independent Multicasting
- Dense Mode (PIM-DM) multicasting protocol.
DVMRP Include Report From
Unknown Neighbors
Enables or disables receiving DVMRP reports from unknown
neighbors.