Users Guide

Version Description
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.8.1.0 Introduced on the C-Series and S-Series.
7.7.1.0 Introduced on the E-Series.
Example
Dell#show ip igmp ssm-map
Interface Vlan 20
Group 232.1.1.5
Uptime 00:11:22
Expires Never
Router mode INCLUDE
Last reporter 35.0.0.2
Group source list
Source address Expires
65.0.0.1 00:01:22
65.0.0.2 00:01:22
65.0.0.3 00:01:22
65.0.0.4 00:01:22
65.0.0.5 00:01:22
Related Commands ip igmp ssm-map — uses a statically congured list to translate (*,G) memberships to (S,G) memberships.
IGMP Snooping Commands
Dell Networking OS supports IGMP Snooping version 2 and 3 on all Dell Networking systems.
Important Points to Remember for IGMP Snooping
• Dell Networking OS supports version 1, version 2, and version 3 hosts.
• Dell Networking OS 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 ow table not in Layer 2 forwarding information base (FIB).
• Dell Networking OS IGMP snooping implementation is based on draft-ietf-magma-snoop-10.
• Dell Networking OS 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 conguring 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 multiple spanning tree protocol (MSTP) triggers 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 congure 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 does not start if there is a statically congured multicast router interface in the VLAN.
Internet Group Management Protocol (IGMP)
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