Chapter 5: Switching Commands 509
no set igmp This command disables IGMP Snooping on the system, an interface, a range of
interfaces, or a VLAN.
set igmp header-
validation
This command enables header validation for IGMP messages.
When header validation is enabled, IGMP Snooping checks:
◆ The time-to-live(TTL) field in the IGMP header and drops packets where
TTL is not equal to 1. The TTL field should always be set to 1 in the headers
of IGMP reports and queries.
◆ The presence of the router alert option (9404) in the IP packet header of the
IGMPv2 message and drops packets that do not include this option.
◆ The presence of the router alert option (9404) and ToS Byte = 0xC0 (Internet
Control) in the IP packet header of IGMPv3 message and drops packets that
do not include these options.
no set igmp header-
validation
This command disables header validation for IGMP messages.
set igmp
interfacemode
This command enables IGMP Snooping on all interfaces. If an interface has
IGMP Snooping enabled and you enable this interface for routing or enlist it as a
member of a port-channel (LAG), IGMP Snooping functionality is disabled on
Format
no set igmp [
vlan_id
]
Mode ◆ Global Config
◆ Interface Config
◆ VLAN Config
Default enabled
Format
set igmp header-validation
Mode Global Config
Format
no set igmp header-validation
Mode Global Config
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