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Troubleshooting VM Performance Issues
• If using virtual LANS (VLANs), make sure the vSwitch is configured with the correct VLAN.
• If using static MAC addresses, or VMs that are cloned, make sure there are no duplicate MAC addresses.
Troubleshooting VM Performance Issues
The Cisco CSR 1000v operates within a set of supported VM parameters and settings to provide certain levels
of performance that have been tested by Cisco. Use the vSphere Client to view data to troubleshoot VM
performance. If you are using vCenter, you can view historical data. If you are not using vCenter, you can
view live data from the host.
This is a list of troubleshooting tips for performance issues:
Troubleshooting MTU
Verify that the router has the correct setting for maximum MTU.
By default, the maximum MTU on the router is 1500. To support jumbo frames, edit the default VMware
vSwitch settings. For more information, see the VMware vSwitch documentation.
Note
ESXi 5.0 supports a maximum MTU of 9000, even if jumbo frames are enabled on the router.
Troubleshooting Memory
The Cisco CSR 1000v does not support memory sharing between VMs. On the ESXi host, check the memory
counters to find out how much used memory and shared memory is on the VM. Verify that the balloon and
swap used counters are zero.
If a given VM does not have enough memory to support the Cisco CSR 1000v, increase the size of the VM's
memory. Insufficient memory on the VM or the host can cause the Cisco CSR 1000v console to hang and be
non-responsive.
Note
When troubleshooting performance issues, note that other VMs on the same host as the Cisco CSR 1000v
can impact the performance of the Cisco CSR 1000v VM. Verify that other VMs on the host are not causing
memory issues that are impacting the Cisco CSR 1000v VM.
Troubleshooting Network Packets
Verify that no network packets are being dropped. On the ESXi host, check the network performance and
view the counters to measure the number of receive packets and transmit packets dropped.
Troubleshooting Cisco CSR 1000v VM Issues
2
Duplicate MAC addresses can cause the Cisco CSR 1000v feature license to become invalidated, which
will disable the router interfaces.
Troubleshooting Cisco CSR 1000v VM Issues
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