Table Of Contents
Cisco Nexus 1000V Release Notes, Release 4.2(1) SV1(4b)
Updated: August 1, 2013Part Number: OL-22822-03 E0
This document describes the features, limitations, and caveats for the Cisco Nexus 1000V Release 4.2(1)SV1(4b) software. Use this document in combination with documents listed in the "Available Documents" section. The following is the change history for this document.
This document includes the following sections:
The Cisco Nexus 1000V provides a distributed, Layer 2 virtual switch that extends across many virtualized hosts. The Cisco Nexus 1000V manages a data center defined by the vCenter Server. Each server in the data center is represented as a line card in Cisco Nexus 1000V and can be managed as if it were a line card in a physical Cisco switch.
Cisco Nexus 1000V consists of the following two components:
•Virtual Supervisor Module (VSM), which contains the Cisco CLI, configuration, and high-level features.
•Virtual Ethernet Module (VEM), which acts as a line card and runs in each virtualized server to handle packet forwarding and other localized functions.
This section includes the following topics:
Software Compatibility with VMware
The servers that run the Cisco Nexus 1000 VSM and VEM must be in the VMware Hardware Compatibility list. This release of Cisco Nexus 1000V supports vSphere 4.0.0, 4.1.0 and 5.0.0 release trains. For additional compatibility information, see the Cisco Nexus 1000V Compatibility Information, Release 4.2(1)SV1(4b).
Note All virtual machine network adapter types that VMware vSphere supports are supported with Cisco Nexus 1000. Refer to the VMware documentation when choosing a network adapter. For more information, see the VMware Knowledge Base article #1001805.
Software Compatibility with Cisco Nexus 1000
This release supports nondisruptive software upgrades from Release 4.0(4)SV1(3) and later releases. Upgrades are supported from 4.0(4)SV1(3) and earlier releases. For additional information, see the Cisco Nexus 1000V Software Upgrade Guide, Release 4.2(1)SV1(4b).
New and Changed Information
This section provides the following information about this release:
Changed Software Features
The following software features are changed in NX-OS Release 4.2(1)SV1(4b):
The behavior of the high availability feature has changed in NX-OS Release 4.2(1)SV1(4b):
•You can clear the secondary VSM configuration and add it to the existing primary VSM.
•You can clear the primary VSM configuration and add it to the existing secondary VSM.
For more information, see the Cisco Nexus 1000V High Availability and Redundancy Configuration Guide, Release 4.2(1)SV1(4b).
New Software Features
Cisco NX-OS Release 4.2(1)SV1(4b)is a maintenance release that includes bug fixes. It does not include new software features.
Limitations and Restrictions
The Cisco Nexus 1000V has the following limitations and restrictions:
Table 1 shows the Cisco Nexus 1000V configuration limits:
Table 1 Configuration Limits for Cisco Nexus 1000V
Component Supported Limits for Cisco Nexus 1000V in the Same Datacenter Supported Limits for Cisco Nexus 1000V Across Two Datacenters
Virtual Ethernet Module(VEM)
Virtual Supervisor Module (VSM)
2 in an HA Pair (active-standby hosted in the same datacenter)
2 in an HA Pair (active-standby hosted in the same datacenter)
vCenter Server Datacenters per VSM
Active VLANs across all VEMs
MACs per VEM
MACs per VLAN per VEM
vEthernet interfaces per port profile
Distributed Virtual Switches (DVSes) per vCenter
vCenter Server connections
1 per VSM HA Pair1
1 per VSM HA Pair1
Maximum latency between VSMs and VEMs
Per DVS Per Host Per DVS Per Host
Virtual Service Domains (VSDs)
System port profiles
ACEs per ACL
QoS policy maps
QoS class maps
DHCP snoop binding entries (static + dynamic)
1 Only one connection to vCenter server is permitted at a time.
2 This number can be exceeded if VEM has available memory.
Single VMware Data Center Support
The Cisco Nexus 1000V can be connected to a single VMware vCenter Server data center object. Note that this virtual data center can span across multiple physical data centers.
vMotion of VSM
vMotion of the VSM has the following limitations and restrictions:
•vMotion of a VSM is supported for both the active and standby VSM VMs. For high availability, we recommend that the active VSM and standby VSM reside on separate hosts.
•If you enable Distributed Resource Scheduler (DRS), then you must use the VMware anti-affinity rules to ensure that the two virtual machines are never on the same host, and that a host failure cannot result in the loss of both the active and standby VSM.
•VMware vMotion does not complete when using an open virtual appliance (OVA) VSM deployment if the CD image is still mounted. To complete the vMotion, either click Edit Settings on the VM to disconnect the mounted CD image, or power off the VM. No functional impact results from this limitation.
•If you are adding one host in a DRS cluster that is using vSwitch to a VSM, you must move the remaining hosts in the DRS cluster to the VSM. Otherwise, the DRS logic does not work, the VMs that are deployed on the VEM could be moved to a host in the cluster that does not have VEM, and the VMs lose network connectivity.
For more information about vMotion of VSM, see the Cisco Nexus 1000V Software Installation Guide, Release 4.2(1)SV1(4b).
VMware Lab Manager
VMware Lab Manager does not support using the Cisco Nexus 1000V.
When you upgrade to Cisco NX-OS Release 4.2(1)SV1(4b), you need to follow a different upgrade path depending on whether you start from Release 4.0(4)SV1(3) and its maintenance updates, or from Release 4.2(1)SV1(4) and its updates. In the former case, you must upgrade the VEMs before the VSM; in the latter case, you should follow the regular ISSU flow of upgrading the VSM first.
For detailed information and step-by-step instructions, see the Cisco Nexus 1000v Software Installation and Upgrade Guide, Release 4.2(1)SV1(4b).
For upgrade assistance, see the interactive upgrade tool Cisco Nexus 1000V and VMware ESX/ESXi Upgrade Utility.
For additional information about software installation, watch the video Installing VSMs and VEMs Using the Nexus 1000V Installation Manager Center.
For more information about VMware compatibility, see the Cisco Nexus 1000V Compatibility Information, Release 4.2(1)SV1(4b).
Note If you need to upgrade from Cisco NX-OS Release 4.0(4)SV1(3x) to Cisco NX-OS Release 4.2(1)SV1(5.1), you must first upgrade to Release 4.2(1)SV1(4b) and then upgrade immediately to Release 4.2(1)SV1(5.1). In this upgrade path, Release 4.2(1)SV1(4b) serves only as a transitory release.
Note If customers are running Release 4.2(1)SV1(4b) in a production environment and they want to upgrade to a 4.2(1)SV1(5.x) release, we recommend upgrading to Release 4.2(1)SV1(5.2) or a later release.
ACLs have the following limitations and restrictions:
•IPV6 ACL rules are not supported.
•VLAN-based ACLs (VACLs) are not supported.
•ACLs are not supported on port channels.
•IP ACL rules do not support the following:
•Control VLAN traffic between the VSM and VEM does not go through ACL processing.
The NetFlow configuration has the following support, limitations, and restrictions:
•Layer 2 match fields are not supported.
•NetFlow Sampler is not supported.
•NetFlow Exporter format V9 is supported
•NetFlow Exporter format V5 is not supported.
•The multicast traffic type is not supported. Cache entries are created for multicast packets, but the packet/byte count does not reflect replicated packets.
•NetFlow is not supported on port channels.
The NetFlow cache table has the following limitation:
•Immediate and permanent cache types are not supported.
Note The cache size that is configured using the CLI defines the number of entries, not the size in bytes. The configured entries are allocated for each processor in the ESX host and the total memory allocated depends on the number of processors.
Port security has the following support, limitations, and restrictions:
•Port security is enabled globally by default.
The feature/no feature port-security command is not supported.
•In response to a security violation, you can shut down the port.
•The port security violation actions that are supported on a secure port are Shutdown and Protect. The Restrict violation action is not supported.
•Port security is not supported on the PVLAN promiscuous ports.
Port profiles have the following restrictions or limitations:
•There is a limit of 255 characters in a port-profile command attribute.
•We recommend that you save the configuration across reboots, which will shorten the VSM bringup time.
•We recommend that if you are altering or removing a port channel, you should migrate the interfaces that inherit the port channel port profile should migrate to a port profile with the desired configuration, rather than editing the original port channel port profile directly.
•If you attempt to remove a port profile that is in use, that is, one that has already been auto-assigned to an interface, the Cisco Nexus 1000V generates an error message and does not allow the removal.
•When you remove a port profile that is mapped to a VMware port group, the associated port group and settings within the vCenter Server are also removed.
•Policy names are not checked against the policy database when ACL/NetFlow policies are applied through the port profile. It is possible to apply a nonexistent policy.
•Port-profile migration can fail if you attempt to migrate 100 or more ports from one port group to another on the same host. This issue can occur if there are 160 vEth interfaces present on a host and you attempt to move 100 or fewer port profiles on the same host. To avoid this issue, reduce the number of interfaces being migrated at one time. Approximately 10 interfaces can be migrated at one time.
Telnet Enabled by Default
The Telnet server is enabled by default.
For more information about Telnet, see the Cisco Nexus 1000V Security Configuration Guide, Release 4.2(1)SV1(4b).
Only SSH version 2 (SSHv2) is supported.
For more information, see the Cisco Nexus 1000V Security Configuration Guide, Release 4.2(1)SV1(4b).
Cisco NX-OS Commands Might Differ from Cisco IOS
Be aware that the Cisco NX-OS CLI commands and modes might differ from those commands and modes used in the Cisco IOS software.
For information about CLI commands, see the Cisco Nexus 1000V Command Reference, Release 4.2(1)SV1(4).
For more information about the CLI command modes, see the Cisco Nexus 1000V Getting Started Guide, Release 4.2(1)SV1(4b)
Layer 2 Switching
This section lists the Layer 2 switching limitations and restrictions and includes the following topics:
For more information about Layer 2 switching, see the Cisco Nexus 1000V Layer 2 Switching Configuration Guide, Release 4.2(1)SV1(4).
No Spanning Tree Protocol
The Cisco Nexus 1000V forwarding logic is designed to prevent network loops so it does not need to use the Spanning Tree Protocol. Packets that are received from the network on any link connecting the host to the network are not forwarded back to the network by the Cisco Nexus 1000V.
Cisco Discovery Protocol
The Cisco Discovery Protocol (CDP) is enabled globally by default.
CDP runs on all Cisco-manufactured equipment over the data link layer and does the following:
•Advertises information to all attached Cisco devices.
•Discovers and views information about those Cisco devices.
–CDP can discover up to 256 neighbors per port if the port is connected to a hub with 256 connections.
If you disable CDP globally, then CDP is also disabled for all interfaces.
For more information about CDP, see the Cisco Nexus 1000V System Management Configuration Guide, Release 4.2(1)SV1(4b).
DHCP Not Supported for the Management IP
DHCP is not supported for the management IP. The management IP must be configured statically.
The Link Aggregation Control Protocol (LACP) is an IEEE standard protocol that aggregates Ethernet links into an EtherChannel.
Cisco Nexus 1000V has the following restrictions for enabling LACP on ports carrying the control and packet VLANs:
Note These restrictions do not apply to other data ports using LACP.
•If LACP offload is disabled, at least two ports must be configured as part of LACP channel.
Note This restriction is not applicable if LACP offload is enabled. You can check the LACP offload status using the show lacp offload status command.
•The upstream switch ports must be configured in spanning-tree port type edge trunk mode. For more information about this restriction, see Upstream Switch Ports.
Upstream Switch Ports
All upstream switch ports must be configured in spanning-tree port type edge trunk mode.
Without spanning-tree portfast on upstream switch ports, it takes approximately 30 seconds to recover these ports on the upstream switch. Because these ports are carrying control and packet VLANs, VSM loses connectivity to the VEM.
The following commands are available to use on Cisco upstream switch ports in interface configuration mode:
•spanning-tree portfast trunk
•spanning-tree portfast edge trunk
The Cisco Nexus 1010 (1000V) cannot resolve a domain name or hostname to an IP address.
When the maximum transmission unit (MTU) is configured on an operationally up interface, the interface goes down and comes back up.
This section includes the following topics:
The following are descriptions of the caveats in Cisco Nexus 1000V Release 4.2(1)SV1(4b). The ID links you into the Cisco Bug Toolkit.
The caveats are listed in the following categories:
Platform, Infrastructure, Ports, Port Channel, and Port Profiles
ID Open Caveat Headline
Need to send traffic from the destination VM to learn the vns-binding.
Cisco Nexus 1000cannot support more than 245 port (physical + virtual) per VEM.
Not able to migrate VC/VSM and normal VM when adding host to DVS.
SNMP V3 traps are not getting generated.
Incorrect iSCSI multipathing configuration causes module flap or vMotion failure.
UCS Blade Oplin adapter comes up with timing issue during Fl reboot.
After VIB upgrade, some of the palo NICs go into INIT state on Fl.
The no channel-group command displays the following:
ERROR:No profile matching given profile name.
LACP offload configuration is not persisting in stateless.
Initial installation summary missing in app before migrating.
AIPC fragment timeout and errors cause module flapping with 2048 VLANs configured.
L3 Control/ERSPAN vmknic flaps when another vmknic with L3 control is removed.
Eth_port_sec failure during migration in VC with interface override in VSM.
Interface in "NoPortProfile" state on mode change from LACP to MAC pinning.
Adding new vEth interface goes to NoPortProfile during ISSU.
ISSU aborted if services memory is full.
CDP does not work for certain NIC cards without VLAN 1 allowed.
Need to block add/remove of PVLANs on interface with no explicit VLANs all.
Native VLAN missing in OD if PP is configured as pVLAN trunk promiscuous.
Continuous SNMP polling causes high CPU usage.
Integrate Apache with netstack.
Backward compatibility of VEMs fails with UUFB feature.
Legacy LACP takes 30 minutes to come up after a link flap.
The load-interval counter command configuration is not working.
Post module flap violated port is secured and the secured port is violated.
After a write erase command, the user is forced to reregister the extension on a VC.
A virtual Ethernet interface as trunk has pinning issue in MN ESX hosts.
An ICMP packet size of 8922 to 8972 does not work with the Layer 2 VSG and VXLAN.
An ICMP packet size of 1423to 1427 does not work with Layer 2 VSG and VXLAN.
An ICMP packet size greater than 1378 does not work with Layer 3 VSG.
Cisco Nexus 1000V does not recompute the UDP checksum when option 82 is inserted.
A module does not come up if the lowest numbered vmnic on Cisco Nexus 1000V is down.
Active VSMs CPU utilization is more than 50% when there are 512 groups.
The show tech-support dvs command does not have output related to DHCP snooping.
ERSPAN supports an MTU larger than 1500 bytes.
Migrating to Cisco Nexus 1000V multicast with 126.96.36.199 address stopped working.
A native VLAN configured on the interface port channel, is not programmed on VEM.
After upgrading the VEM to Cisco NX-OS Release 4.2(1)SV1(5.1), two Cisco VIBs are installed.
Multicast drops count as vEth output drops.
Observing module flaps and disconnection of the SVS connection.
Disable the snmp trap link-status command on a vEthernet interface.
The vMotion syslog is missing while doing a vMotion.
Following VSM reload, an incorrect native VLAN displays for a port-channel interface.
vEth interfaces with port security enabled go to error disabled state.
vEth interfaces with port security configured fail to ping following a vMotion.
If you add a primary PVLAN as the SPAN/ERSPAN source, its promiscuous trunk members are not added to the SPAN session.
Free memory check needs to be corrected while checking for ISSU.
An error message appears while launching the installer application.
If you add a PVLAN promiscuous trunk port channel or Ethernet interface as the SPAN/ERSPAN source, some of the VLANs allowed on the port might not be spanned.
Quality of Service
ID Open Caveat Headline
Queueing not programmed on flapping Ethernet port not in a port channel.
Addition of new NIC to port-channel fails if profile has queueing policy.
The following are descriptions of caveats that were resolved in Cisco Nexus 1000V Release 4.2(1)SV1(4b). The ID links you into the Cisco Bug Toolkit.
The Cisco Management Information Base (MIB) list includes Cisco proprietary MIBs and many other Internet Engineering Task Force (IETF) standard MIBs. These standard MIBs are defined in Requests for Comments (RFCs). To find specific MIB information, you must examine the Cisco proprietary MIB structure and related IETF-standard MIBs supported by the Cisco Nexus 1000V Series switch.
The MIB Support List is available at the following FTP site:
This section lists the documents used with the Cisco Nexus 1000 and available on Cisco.com at the following url:
Install and Upgrade
Troubleshooting and Alerts
Virtual Security Gateway Documentation
Virtual Network Management Center
Network Analysis Module Documentation
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:
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This document is to be used in conjunction with the documents listed in the "Available Documents" section.
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