NEC IP8800/S2400 User Manual

3.   

Troubleshooting Functional Failures in Operation

47

3.5.5

Multicast Relay by MLD snooping Is Disabled

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

Figure 3-6: Analysis Flow

Analysis Flow

Is there log information?

Is filter setting correct?

Is there MLD querier?

Is the device that relays

 multicast data connected

to the same

VLAN?

Is it a relay within

the same VLAN?

Verify that the MLD snooping 

configuration is properly set up in 

the corresponding VLAN.

Refer to "

."

Verify that other devices 

are set to relay the 

multicast data.

See the manual "Message Log 
Reference" and perform the 
action 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 MLD snooping.

Set the connecting port as 

a multicast router port.

Is the data relayed 

within the same

VLAN?

Is IPv6 multicast used?

Verify that the settings for 
using IPv6 multicast at the 
same time are correct.

Unresolved

Unresolved

Y

Y

Y

Y

Y

Y

N

N

Y

N

N

N

N

N

This system may be the 

MLD querier.