Cisco Systems CSR 1000V Adding and Deleting Network Interfaces on the Cisco CSR 1000V

10-3
Cisco CSR 1000V Series Cloud Services Router Software Configuration Guide
OL-27477-07
Chapter10 Mapping Cisco CSR 1000V Network Interfaces to VM Network Interfaces
Mapping the Router Network Interfaces to Virtual Network Interface Cards
Note The vNIC name shown in the display is a logical interface that the Cisco CSR 1000V uses to map to the
interface on the hypervisor. It does not always map to the corresponding NIC name added during the VM
installation. For example, the logical “eth1” vNIC name in the display may not necessarily map to
“NIC1” as added in the VM installation process.
The following is a sample display for Cisco IOS XE Release 3.10S:
Router# show platform software vnic-if interface-mapping
-----------------------------------------------------------------------
Interface Name Driver Name Mac Addr
-----------------------------------------------------------------------
GigabitEthernet0 vmxnet3 000c.2946.3f4d
GigabitEthernet2 vmxnet3 0050.5689.0034
GigabitEthernet1 vmxnet3 0050.5689.000b
-----------------------------------------------------------------------
Note that beginning with Cisco IOS XE Release 3.11S, the GigabitEthernet0 interface is no longer
supported.
Caution It is important that you verify the interface mapping before you begin configuring the Gigabit Ethernet
network interfaces on the Cisco CSR 1000V. This ensures that the network interface configuration will
apply to the correct physical MAC address interface on the VM host.
If you reboot the router and do not add or delete any vNICs, the interface mapping will remain the same.
If you delete vNICs, special care must be taken to ensure that the configuration for the remaining
interfaces remains intact. For more information, see the “Adding and Deleting Network Interfaces on the
Cisco CSR 1000V” section on page10-3.
Adding and Deleting Network Interfaces on the Cisco CSR 1000V
The Cisco CSR 1000V maps the router GigabitEthernet interfaces to the logical vNIC name assigned by
the VM, which in turn is mapped to a MAC address on the VM host. You can add or delete vNICs on the
VM to add or delete GigabitEthernet interfaces on the Cisco CSR 1000V. You can add vNICs while the
router is active.
To delete a vNIC from the VM, you must first power down the VM. If you delete any vNICs, the router
must be rebooted. For more information about adding and deleting vNICs, see the VMware
Documentation.
Caution Cisco recommends using caution before removing any existing vNICs on the Cisco CSR 1000 VM. If
you remove a vNIC without first updating the Cisco CSR 1000V network interface configuration, you
risk a configuration mismatch when the router reboots. When the router reboots and a vNIC has been
removed, the remaining logical vNIC names could get reassigned to different MAC addresses. As a
result, the GigabitEthernet network interfaces on the Cisco CSR 1000V could get reassigned to different
physical interfaces on the hypervisor.
Before you add or delete network interfaces, first verify the interface-to-vNIC mapping using the show
platform software vnic-if interface-mapping command.