Symptoms, Causes, And Solutions - Cisco Nexus 1000V Troubleshooting Manual

Problems with Multicast IGMP Snooping
S e n d d o c u m e n t c o m m e n t s t o n e x u s 1 k - d o c f e e d b a c k @ c i s c o . c o m .
Example 18-4 module vem

Symptoms, Causes, and Solutions

Symptom
A VM which is interested in
multicast traffic, but is not
receiving the multicast
traffic.
Cisco Nexus 1000V Troubleshooting Guide, Release 4.2(1)SV2(2.1)
18-4
module-number execute
n1000V# module vem 3 execute vemcmd show vlan 159
BD 159, vdc 1, vlan 159, 3 ports
Portlist:
18 vmnic3
47 fedora8.eth0
Multicast Group Table:
Group 224.1.2.3 RID 1 Multicast LTL 4408
47
18
Group 0.0.0.0 RID 2 Multicast LTL 4407
18
vemcmd show vlan Command
Possible Causes
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—
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Chapter 18 Multicast IGMP
Solution
Use the debug ip igmp snooping vlan
command to determine if IGMP
snooping is working as expected.
Examine the output to see if the port is
receiving the IGMP report and if the
interface has been added to the
multicast traffic interface list for the
VM.
Use module vem module-number
execute vemcmd show vlan command
to verify that the multicast distribution
table in the VEM has the correct
information in it.
Use the module vem module-number
execute vemcmd show port command
to see the port table. Make sure the
table has the correct information in it.
Make sure that the state of the trunk
port and the access port is UP/UP.
OL-28795-01