Cisco Systems CSR 1000V Cisco CSR 1000V and Hypervisor Limitations

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Cisco CSR 1000V Series Cloud Services Router Software Configuration Guide

OL-27477-07

Chapter1 Cisco CSR 1000V Series Cloud Services Router Over view

Virtual Machine Requirements

The VMXNET3, VIF and Virtio NIC types are para-virtualized NICs.

Note vNIC Hot Remove requires reloading the Cisco CSR 1000V.

Cisco CSR 1000V and Hypervisor Limitations

This section describes performance limitations due to how the Cisco CSR 1000V integrates with the

supported hypervisors.

•When the Cisco CSR 1000V is installed on Microsoft Hyper-V, the interface numbers can change

after Microsoft Hyper-V fails over to a new server, or restarts after a live migration.

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If the server is set to perform ungraceful failover, there is no workaround.

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If the server is set to perform graceful failover or restart, enter the clear platform software

vnic-if nvtable command before executing the failover or restart.

This issue is not seen if the maximum number of interfaces is configured.

•When the Cisco CSR 1000V is installed on Microsoft Hyper-V, if you want to configure a VLAN,

you must configure the VLAN interfaces on Microsoft Hyper-V using the Hyper-V Power Shell CLI.

•When the Cisco CSR 1000V is installed on Microsoft Hyper-V and an NSF-based virtual hard disk

is used, if there is a network connectivity issue between the Cisco CSR 1000V and the NSF server,

the Cisco CSR 1000V is unable to use the virtual hard disk even if the network connection is

restored. You must reboot the Cisco CSR 1000V to restore access to the virtual hard disk.

•Configuring Network Based Application Recognition (NBAR), or Application Visibility and

Control (AVC) support on the Cisco CSR 1000V requires a minimum of 4GB of DRAM on the VM,

even when using the one vCPU configuration on the VM.

•On the Cisco CSR 1000V, all the NICs are logically named as the Gigabit Ethernet interface. The

Cisco CSR 1000V does support the 10G IXGBE vNIC in passthrough mode; but that interface also

is also logically named as a Gigabit Ethernet interface. Note that with emulated devices like

VMXNET3/PV/VIRTIO from the hypervisor, the Cisco CSR 1000V is not aware of the underlying

interfaces. The vSwitch may be connected to a 10-GB physical NIC or 1-GB physical NICs or

multiple NICs (with NIC teaming on the hypervisor) as well.

•The Cisco CSR 1000V supports an MTU range from 1500 to 9216 bytes. However, the maximum

MTU supported on your hypervisor version may be lower. The MTU value configured on the

Cisco CSR 1000V should not exceed the maximum MTU value supported on the hypervisor.

The following are the Cisco CSR 1000V and VMware ESXi limitations for CiscoIOS XE Release 3.9S:

•The Cisco CSR 1000V interface bandwidth defaults to 1GB, irrespective of the hypervisor’s

physical NIC bandwidth. The routing protocols (OSPF, EIGRP) use the Cisco CSR 1000V interface

bandwidth values for calculating the costs, not the physical NIC bandwidth.