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19-8
Cisco Nexus 1000V Troubleshooting Guide, Release 5.2(1)SV3(1.1)
OL-31593-01
Chapter 19 Multicast IGMP
Problems with Multicast IGMP Snooping
Note Even if you enable the debug command for IGMP snooping, log details are not available for
multicast groups and their members.
Example 19-4 module vem
module-number execute
vemcmd show vlan Command
switch# 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
On the VSM, use the following command:
•
module vem 3 execute vemcmd show igmp 1784
In Example 19-2 , global IGMP snooping is enabled on VLAN 1784 (the disabled global state takes
precedence)
Multicast group table values are as follows:
Group 227.0.0.1, Multicast LTL: 10363
Group */*, Multicast LTL: 10358
•
module vem 3 execute vemcmd show igmp 1784 de
In Example 19-2 , global IGMP snooping is enabled on VLAN 1784 (the disabled global state takes
precedence)
Multicast group table values are as follows:
Group 227.0.0.1, Multicast LTL: 10363
Members: 59, 1039
Group */*, Multicast LTL: 10358
Members: 1039
Querier Info -
IP Address: 184.184.0.12
Uptime: 241955 seconds
Version: 3
Timeout: 8 seconds
• module vem module-number execute vemcmd show vlan
In Example 19-4 , the output shows that LTL 18 corresponds to vmnic3, and LTL 47 corresponds to
VM fedora8, interface eth0.
The multicast group table for 224.1.2.3 shows the interfaces that the VEM forwards to when it
receives multicast traffic for group 224.1.2.3. If fedora8 has multicast group 224.1.2.3 on its eth0
interface, LTL 47 should be in the multicast group table for 224.1.2.3.