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Cisco Nexus 1000V Troubleshooting Guide, Release 5.2(1)SV3(1.1)
OL-31593-01
Chapter 7 VSM and VEM Modules
Problems with the VSM
• If the output of the show svs neighbors command in Step 1 does not display the VEM MAC address,
there is a problem with connectivity between the server hosting the VSM and the upstream switch.
Recheck the VSM configuration and vCenter Server configuration.
• Otherwise, continue with the next step.
Step 3 On the VEM, run the vem-health script using the VSM MAC address that you found in Step 1.
Note If the vem-health script is not in the PATH, you can find it under
/usr/lib/ext/cisco/nexus/vem*/sbin/.
vem-health check vsm_mac_address
The vem-health script output shows the cause of the connectivity problem and recommends the next
steps for troubleshooting the problem.
Example:
~ # vem-health check 00:50:56:a3:36:90
VSM Control MAC address: 00:50:56:a3:36:90
Control VLAN: 90
DPA MAC: 00:02:3d:40:5a:03
VSM heartbeats are not reaching the VEM.
Your uplink configuration is correct.
Recommended action:
Check if the VEM's upstream switch has learned the VSM's Control MAC.
Step 4 Do one of the following:
• If the VEM health check in Step 3 indicates a problem with connectivity to the upstream switch.
continue with the next step.
• Otherwise, go to Step 7.
Step 5 On the upstream switch, display the MAC address table to verify the network configuration.
Example:
switch# show mac address-table interface Gi3/1 vlan 3002
Legend: * - primary entry
age - seconds since last seen
n/a - not available
vlan mac address type learn age ports
------+----------------+--------+-----+----------+--------------------------
Active Supervisor:
* 3002 0050.56be.7ca7 dynamic Yes 0 Gi3/1
switch# show mac address-table interface Gi3/2 vlan 3002
Legend: * - primary entry
age - seconds since last seen
n/a - not available
vlan mac address type learn age ports
------+----------------+--------+-----+----------+--------------------------
Active Supervisor:
* 3002 00:02:3d:40:0b:0c dynamic Yes 0 Gi3/2
Step 6 Do one of the following:
• If the output from Step 5 does not display the MAC address of the VSM, then there is a problem
with connectivity between the server hosting the VSM and the upstream switch. Recheck the VSM
configuration and vCenter Server configuration.
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