Cisco Systems manual Cisco CSR 1000V Network Interfaces and VM Cloning, 10-4

Chapter 10 Mapping Cisco CSR 1000V Network Interfaces to VM Network Interfaces

Mapping the Router Network Interfaces to Virtual Network Interface Cards

csr1000v# show platform software vnic-if interface-mapping

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Interface NameDriver NameMac Addr

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GigabitEthernet3	vmxnet3	000c.2946.3f4d
GigabitEthernet2	vmxnet3	0050.5689.0034
GigabitEthernet1	vmxnet3	0050.5689.000b
GigabitEthernet0	vmxnet3	000c.2946.3f4d

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After adding or deleting network interfaces on the VM, always verify the new interface-to-vNIC mapping before making configuration changes to the network interfaces. The following example shows the interface mapping after a new vNIC has been added.

csr1000v# show platform software vnic-if interface-mapping

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Interface NameDriver NameMac Addr

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GigabitEthernet4	vmxnet3	0010.0d40.37ff
GigabitEthernet3	vmxnet3	000c.2946.3f4d
GigabitEthernet2	vmxnet3	0050.5689.0034
GigabitEthernet1	vmxnet3	0050.5689.000b
GigabitEthernet0	vmxnet3	000c.2946.3f4d

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The updated display shows the new vNIC that maps to the GigabitEthernet4 network interface on the Cisco CSR 1000V.

Cisco CSR 1000V Network Interfaces and VM Cloning

When first installed, the Cisco CSR 1000V creates a database that maps the vNIC name to the MAC address. This database is used to maintain a persistent mapping between the router interfaces and the vNIC-to-MAC address mapping in case vNICs are added or deleted. The interfaces are mapped to the stored Universal Unique Identification (UUID) maintained by VMware.

The mapping between the router network interfaces and the vNICs only applies to the current VM that the Cisco CSR 1000V is installed on. If the VM is cloned, then the stored UUID will not match the current UUID and the interface mapping will not match the router configuration.

To prevent the interface mapping from becoming mis-matched, you need to perform the following steps on the original VM before cloning:

Step 1 Make sure the original VM includes the number of configured vNICs required on the cloned VM before beginning the cloning process.

Step 2 Enter the clear platform software vnic-if-nvtable command on the original VM.

This command clears the persistent interface database on the original VM and updates the interface mapping to the hypervisor.

Step 3 Reboot the Cisco CSR 1000V.

Step 4 On the cloned VM, verify the interface mapping using the show platform software vnic-ifinterface-mappingcommand.

Step 5 Configure the router interfaces on the cloned VM accordingly.

If you follow these steps, the router configuration on the cloned VM should match the configuration of the original VM.

	Cisco CSR 1000V Series Cloud Services Router Software Configuration Guide
10-4	OL-27477-07