ES3528MV2 Supports Multicast IP IGMP Snooping - Why VLC Client cannot receive multicast traffic from VLC Server ? Follow
The figure above shows the scenario that multicast traffic does not flow to all ports in the networks. By following steps we can figure out why VCL client does not receive multicast traffic from VCL server.
Step 1. Check IGMP Snooping function and IGMP Snooping Running Status by the command "show ip igmp snooping".
Please note that IGMP Snooping functions only when IGMP Snooping is enabled and IGMP Running Status is active.
SW_1#show ip igmp snooping
IGMP Snooping : Enabled
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
---- --------------- --------
As shown in the configuration above, IGMP snooping function is enabled but IGMP Snooping Running Status is Inactive.
Step 2. Check Multicast router function in SW1 by the command "show ip igmp snooping mrouter".
SW_1#show ip igmp snooping mrouter
VLAN M'cast Router Ports Type Expire
---- ------------------- ------- --------
The configuration shows there is no any multicast router in SW1. It is necessary to have a Multicast Router to control IGMP. Multicast Router controls IGMP by sending out IGMP General Query periodically to solicit receivers who want to join the multicast group and sending Group Specific Query after receiving 'leave messages' to make sure any other receivers remains in that multicast group etc.
Step 3. Check if IP IGMP Snooping Group is grouped by Multicast router by the command "show ip igmp snooping group".
SW_1#show ip igmp snooping group
Bridge Multicast Forwarding Entry Count:1
Flag: R - Router port, M - Group member port
H - Host counts (number of hosts join the group on this port).
P - Port counts (number of ports join the group).
Up time: Group elapsed time (d:h:m:s).
Expire : Group remaining time (m:s).
VLAN Group Port Up time Expire Count
---- --------------- ----------- ----------- ------ --------
1 224.1.1.1 01:00 0(P)
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