How to flow multicast traffic to all ports ?
By disabling IP IGMP snooping.
If IP IGMP Snooping function is disabled, SW1 will flood multicast traffic to all ports when a switch port receives broadcast, unknown unicast or multicast.
The command to disable IGMP Snooping function:
SW_1#config SW_1(config)#no ip igmp snooping
After adjusting, PC1 and SW2 receive multicast traffic, but PC2 will not receive multicast traffic since SW2 is still IGMP Snooping enabled by default.
To check IGMP Snooping function status, use "show ip igmp snooping" command:
SW_1#show IP IGMP snooping IGMP Snooping : Disabled Router Port Expire Time : 300 s Router Alert Check : Disabled Router Port Mode : Forward TCN Flood : Disabled TCN Query Solicit : Disabled Unregistered Data Flood : Disabled 802.1p Forwarding Priority : Disabled Unsolicited Report Interval : 400 s Version Exclusive : Disabled Version : 2 Proxy Reporting : Disabled Querier : Disabled VLAN 1: -------- IGMP Snooping : Enabled IGMP Snooping Running Status : Inactive Version : Using global Version (2) Version Exclusive : Using global status (Disabled) Immediate Leave : Disabled Last Member Query Interval : 10 (unit: 1/10s) Last Member Query Count : 2 General Query Suppression : Disabled Query Interval : 125 Query Response Interval : 100 (unit: 1/10s) Proxy Query Address : 0.0.0.0 Proxy Reporting : Using global status (Disabled) Multicast Router Discovery : Disabled VLAN Static Group Port ---- --------------- --------
To check/display the entries in multicast registration table, use "show ip igmp snooping group" command:
SW_1#show ip igmp snooping group Bridge Multicast Forwarding Entry Count:0
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