Reference Guide

Command Modes
• EXEC
• EXEC Privilege
Command History
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 7.8.1.0 Introduced on the C-Series and S-Series.
Version 7.7.1.0 Introduced on the E-Series.
Related
Commands
ip igmp ssm-map – Uses a statically configured list to translate (*,G) memberships to (S,G)
memberships.
IGMP Snooping Commands
FTOS supports IGMP Snooping version 2 and 3 on all Dell Force10 systems.
Important Points to Remember for IGMP Snooping
• FTOS supports version 1, version 2, and version 3 hosts.
• FTOS IGMP snooping implementation is based on IP multicast address (not based on Layer 2 multicast mac
address) and the IGMP snooping entries are in Layer 3 flow table not in Layer 2 forwarding information base
(FIB).
• FTOS IGMP snooping implementation is based on draft-ietf-magma-snoop-10.
• FTOS supports IGMP snooping on JUMBO-enabled cards.
• IGMP snooping is not enabled by default on the switch.
• A maximum of 1800 groups and 600 VLAN are supported.
• IGMP snooping is not supported on a default VLAN interface.
• IGMP snooping is not supported over VLAN-Stack-enabled VLAN interfaces (you must disable IGMP snooping
on a VLAN interface before configuring VLAN-Stack-related commands).
• IGMP snooping does not react to Layer 2 topology changes triggered by spanning tree protocol (STP).
• IGMP snooping reacts to Layer 2 topology changes triggered by multiple spanning tree protocol (MSTP) by
sending a general query on the interface that comes in the FWD state.
Important Points to Remember for IGMP Querier
• The IGMP snooping Querier supports version 2.
• You must configure an IP address to the VLAN interface for IGMP snooping Querier to begin. The IGMP
snooping Querier disables itself when a VLAN IP address is cleared, and then it restarts itself when an IP
address is reassigned to the VLAN interface.
• When enabled, IGMP snooping Querier will not start if there is a statically configured multicast router interface
in the VLAN.
• When enabled, IGMP snooping Querier starts after one query interval in case no IGMP general query (with IP
SA lower than its VLAN IP address) is received on any of its VLAN members.
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