Default Settings For Igmp Snooping - Cisco Nexus 7000 Series Configuration Manual

Default Settings for IGMP Snooping

• You must enable ip igmp snooping group-timeout when you use ip igmp snooping proxy general-queries.
• Network applications that use unicast destination IP addresses with multicast destination MAC addresses

Default Settings for IGMP Snooping

This table lists the default settings for IGMP snooping parameters.
Parameters
IGMP snooping
Explicit tracking
Fast leave
Last member query interval
Snooping querier
Report suppression
Link-local groups suppression
IGMPv3 report suppression for the entire device
IGMPv3 report suppression per VLAN
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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• The fast leave, explicit tracking, and report suppression options can differ if they are used for
forwarding traffic.
• If a query parameter is different between the devices, one device expires the multicast state faster
while the other device continues to forward. This difference results in either traffic loss or forwarding
for an extended period.
• If an IGMP snooping querier is configured on both devices, only one of them will be active because
an IGMP snooping querier shuts down if a query is seen in the traffic.
We recommend to set it to "never." If this is not done you might have multicast packet loss.
might require the configuration of IGMP snooping to use MAC-based forwarding lookups on the switch.
If the destination MAC address used for this kind of applications is a non-IP multicast MAC address,
use the mac address-table multicast command to statically configure the port membership. If the
destination MAC address is in the IP multicast range, 0100.5E00.0000 to 0100.5E7F.FFFF, use static
IGMP snooping membership entries for the corresponding Layer 3 IP multicast address to configure the
port membership. For example, if the application uses destination MAC address 0100.5E01.0101,
configure a static IGMP snooping membership entry for an IP multicast address that maps to that MAC
address. An example of this is ip igmp snooping static-group 239.1.1.1.
Default
Enabled
Enabled
Disabled
1 second
Disabled
Enabled
Enabled
Disabled
Enabled
Configuring IGMP Snooping