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xStack® DGS-3420 Series Layer 2 Managed Stackable Gigabit Switch CLI Reference Guide
377
36-20 config igmp_snooping data_driven_learning
Description
This command is used to enable or disable the data driven learning of an IGMP snooping group.
When data-driven learning is enabled for a VLAN, when the switch receives IP multicast traffic on
this VLAN, an IGMP snooping group will be created. The learning of an entry is not activated by an
IGMP membership registration, but activated by traffic. For an ordinary IGMP snooping entry, the
IGMP protocol will take care of the aging out of the entry. For a data-driven entry, the entry can be
specified not to aged out by the aged timer.
When data driven learning is enabled and the data driven table is not full, the multicast filtering
mode for all ports will be ignored. The multicast packets will be forwarded to router ports. If the
data driven learning table is full, multicast packets will be forwarded according to the multicast
filtering mode.
Note that if a data-driven group is created and IGMP member ports are learned later on, the entry
will become an ordinary IGMP snooping entry. The aging out mechanism will follow the ordinary
IGMP snooping entry.
Format
config igmp_snooping data_driven_learning [all | vlan_name <vlan_name 32> | vlanid
<vlanid_list>] {state [enable | disable] | aged_out [enable | disable] | expiry_time <sec 1-
65535>}
Parameters
all - Specifies that all VLANs will be configured.
vlan_name - Specifies the VLAN name used.
<vlan_name 32> - Enter the VLAN name used here. This name can be up to 32 characters
long.
vlanid - Specifies the VLAN ID used.
<vlanid_list> - Enter the VLAN ID used here.
state - (Optional) Specifies to enable or disable the data driven learning of an IGMP snooping
group. By default, the state is enabled.
enable - Specifies that the data driven learning of an IGMP snooping group will be enabled.
disable - Specifies that the data driven learning of an IGMP snooping group will be disabled.
aged_out - (Optional) Specifies that the aging out of the entry will be enabled or disabled.
enable - Specifies that the aging out of the entry will be enabled.
disable - Specifies that the aging out of the entry will be disabled.
expiry_time - (Optional) Specifies the data driven group lifetime value used. This value is only
applicable if the aged out option is enabled.
<sec 1-65535> - Enter the expiry time value used here. This value must be between 1 and
65535 seconds.
Restrictions
Only Administrator, Operator and Power-User level users can issue this command.
Example
To enable the data driven learning of an IGMP snooping group on the default VLAN: