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Dell SmartFabric OS10 User Guide Release 10.5.3

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Multicast snooping on VLANs

OS10 supports multicast snooping (IGMP and MLD snooping) on all the supported platforms in the Full Switch Mode and the SmartFabric Services Mode. Starting from Release 10.5.2.1 and later releases:

  • OS10 supports multicast snooping with VLAN scale profile configuration. However, this support is not available on the S4200-ON series switches.
  • To enable the snooping querier functionality on scaled VLANs, you must use the mode l3 command.
  • With scale profile VLAN configuration, multicast snooping is enabled only at the global level and disabled at the per VLAN interface level.
  • Multicast snooping is supported on a maximum of 512 VLANs or 1024 instances (IGMP snooping on 512 VLANs and MLD snooping on 512 VLANs). If there are more than 1024 instances, multicast snooping is disabled on the remaining VLANs. A syslog message similar to the following appears: 
    IGMP/MLD Snooping instance limit exceeded. IGMP/MLD snooping would not be enabled on further vlans.
    When the number of configured VLAN instances goes below 1024, a syslog message similar to the following appears: 
    IGMP/MLD Snooping instance limit receded.IGMP/MLD snooping can be enabled on some vlans.

Upgrade from an earlier release to Release 10.5.2.1 introduces the following changes. The following table indicates the multicast snooping configuration setting at the global level and at the per VLAN interface level pre and post upgrade.

Table 1. Full Switch ModeThis table describes the multicast snooping functionality on an OS10 switch in Full Switch Mode.
Scale profile VLAN configuration Upgrade from 10.5.0.x or earlier to 10.5.2.1 or later Upgrade from 10.5.1.0 to 10.5.2.1 or later Restrictions
Disabled Pre Upgrade Post Upgrade Pre Upgrade Post Upgrade OS10 supports multicast snooping only on up to a maximum of 1024 VLAN instances. If the number of VLAN instances exceed 1024, multicast snooping is disabled.
  • Global: Enabled
  • Per VLAN: Enabled
  • Global: Enabled
  • Per VLAN: Enabled
  • Global: Enabled
  • Per VLAN: Enabled
  • Global: Enabled
  • Per VLAN: Enabled until the maximum number of VLAN instances (1024) is reached and disabled for the remaining VLANs.
Enabled
  • Global: Disabled
  • Per VLAN: Enabled
  • Global: Enabled
  • Per VLAN: Disabled
NOTE: Multicast snooping is disabled at the per VLAN interface level and enabled globally.
  • Global: Disabled
  • Per VLAN: Enabled
  • Global: Enabled
  • Per VLAN: Disabled
NOTE: Multicast snooping is disabled at the per VLAN interface level and enabled globally.
Table 2. SmartFabric Services ModeThis table describes the multicast snooping functionality on an OS10 switch in SmartFabric Services Mode.
Scale profile VLAN configuration Upgrade from 10.5.0.x or earlier to 10.5.2.1 or later Upgrade from 10.5.1.0 to 10.5.2.1 or later Restrictions
Disabled Pre Upgrade Post Upgrade Pre Upgrade Post Upgrade OS10 supports multicast snooping only on up to a maximum of 1024 VLAN instances. If the number of VLAN instances exceed 1024, multicast snooping is disabled.
  • Global: Disabled
  • Per VLAN: Enabled
  • Global: Enabled
  • Per VLAN: Enabled
  • Global: Disabled
  • Per VLAN: Enabled
  • Global: Enabled
  • Per VLAN: Enabled
NOTE: Multicast snooping configuration is enabled at the global as well.
Enabled
  • Global: Disabled
  • Per VLAN: Enabled
  • Global: Enabled
  • Per VLAN: Disabled
NOTE: Multicast snooping is disabled at the per VLAN interface level and enabled globally.
  • Global: Disabled
  • Per VLAN: Enabled
  • Global: Enabled
  • Per VLAN: Disabled
NOTE: Multicast snooping is disabled at the per VLAN interface level and enabled globally.

Use the show ip igmp snooping summary and show ipv6 mld snooping summary commands to view the number of multicast snooping-enabled interfaces.

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