Administrator Guide

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 configured list to translate (*,G) memberships to (S,G) memberships.
IGMP Snooping Commands
IGMP Snooping version 2 and 3 are supported on the switch.
Important Points to Remember for IGMP Snooping
• The Dell Networking OS supports version 1, version 2, and version 3 hosts.
• The 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).
• The IGMP snooping implementation is based on draft-ietf-magma-snoop-10.
• The system 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 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 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 does 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.
• When enabled, IGMP snooping Querier periodically sends general queries with an IP source address of the VLAN interface. If it
receives a general query on any of its VLAN member, it checks the IP source address of the incoming frame.
If the IP SA in the incoming IGMP general query frame is lower than the IP address of the VLAN interface, the switch disables its
IGMP snooping Querier functionality.
If the IP SA of the incoming IGMP general query is higher than the VLAN IP address, the switch continues to work as an IGMP
snooping Querier.
clear ip igmp snooping groups
Clear snooping entries from the group cache table.
C9000 Series
Syntax
clear ip igmp snooping groups [group-address interface | interface]
Parameters
group-address (OPTIONAL) Enter the IP multicast group address in dotted decimal format.
interface interface Enter the following keywords and slot/port or number information:
Internet Group Management Protocol (IGMP) 833