NEC IP8800/S6300 User Manual

3.   

Troubleshooting Functional Failures in Operation

44

3.5.4

Multicast Relay by IGMP snooping Is Disabled

If multicast relay is disabled when using IGMP snooping, follow the analysis flow to identify the symptom using steps 
shown in the table below and isolate the problem.

Figure 3-5: Analysis Flow

Analysis Flow

Is there log information?

Is filter setting correct?

Is there IGMP querier?

see the manual "Message Log 
Reference" and perform the 
actions described in [Action] 
associated with each log 
message.

Verify that the settings of 
filter and QoS Control are 
correct.

Set IP address on VLAN, 
and add the querier 
function in IGMP snooping.

Is the device that relays

 multicast data connected

Unresolved

Set the connecting port as 

a multicast router port.

Unresolve

to the same

VLAN?

Verify that the configuration of 

IGMP snooping is properly set in 

the corresponding VLAN.

Is it a relay within 

the same VLAN?

Refer to "

."

Verify that other systems 

are set to relay the 

multicast data.

Is the data relayed within

the same VLAN?

Is IPv4 multicast used?

Verify that the settings for 
using IPv4 multicast at the 
same time are correct.

This system may be the 

IGMP querier.

Y

Y

N

N

Y

N

N

Y

N

N

N

Y

Y

Y