Reference Guide
show ip igmp ssm-map
Display is a list of groups that are currently in the IGMP group table and contain SSM mapped sources.
S5000
Syntax
show ip igmp ssm-map [group]
Parameters
group (OPTIONAL) Enter the multicast group address in the form
A.B.C.D to display the list of sources to which this group is
mapped.
Command
Modes
• EXEC
• EXEC Privilege
Command
History
Version 9.0(1.3) Introduced on the S5000.
Related
Commands
ip igmp ssm-map – Uses a statically configured list to translate (*,G) memberships
to (S,G) memberships.
IGMP Snooping Commands
Dell Networking OS supports IGMP Snooping version 2 and 3 on the S5000 switch.
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 flow table not in Layer 2
forwarding information base (FIB).
• Dell Networking OS IGMP snooping implementation is based on draft-ietf-magma-snoop-10.
• 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.
506
Internet Group Management Protocol (IGMP)