Current Release: NX-OS Release 4.2(1)SV1(5.2)
This document describes the features, limitations, and caveats for the Cisco Nexus 1000V Release 4.2(1)SV1(5.2) software. Use this document in combination with documents listed in the “Related Documentation” section. The following is the change history for this document.
|OL-27571-01||A0||August 21, 2012||Created release notes for Release 4.2(1)SV1(5.2).|
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 the Cisco Nexus 1000V and can be managed as if it were a line card in a physical Cisco switch.
The 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 1000V VSM and VEM must be in the VMware Hardware Compatibility list. This release of the Cisco Nexus 1000V supports vSphere 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(5.2).
Note All virtual machine network adapter types that VMware vSphere supports are supported with the Cisco Nexus 1000V. 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 1000V
This release supports hitless upgrades from Release 4.0(4)SV1(3a) 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(5.2).
New and Changed Information
This section provides the following information about Cisco Nexus 1000V Release 4.2(1)SV1(5.2):
Changed Software Features
The following software features were changed in Cisco Nexus 1000V Release 4.2(1)SV1(5.2):
Starting with Cisco Nexus 1000V Release 4.2(1)SV1(5.1), the Cisco Nexus 1000V Installation Management Center is now a standalone Java application that can install the Cisco Nexus1000V VSM or VEM.
The Cisco Nexus 1000V Installation Management Center supports a single pane for invoking the Cisco Nexus1000V VSM installer and VEM installer.
For more information, see the Cisco Nexus 1000V Installation and Upgrade Guide, Release 4.2(1)SV1(5.2).
New Software Features
There are no new software features included in Cisco Nexus 1000V Release 4.2(1)SV1(5.2).
Limitations and Restrictions
The Cisco Nexus 1000V has the following limitations and restrictions:
Table 1 shows the Cisco Nexus 1000V configuration limits:
Supported Limits for Cisco Nexus 1000V in the Same Datacenter
Supported Limits for Cisco Nexus 1000V Across Two Datacenters
|Virtual Ethernet Module (VEM)||64||32|
|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||1||1|
|Active VLANs or VXLANs across all VEMs||2048 (any combination of VLANs and VXLANs)||1024 (any combination of VLANs and VXLANs)|
|MACs per VEM||32000||32000|
|MACs per VLAN per VEM||4000||4000|
|vEthernet interfaces per port profile||1024||1024|
|Distributed Virtual Switches (DVS) per vCenter with VMware vCloud Director (vCD)||12||12|
|Distributed Virtual Switches (DVS) per vCenter without VMware vCloud Director (vCD)||32||32|
|vCenter Server connections||1 per VSM HA Pair1||1 per VSM HA Pair1|
|Maximum latency between VSMs and VEMs||5ms||5ms|
|Virtual Service Domains (VSDs)||64||6||32||3|
|System port profiles||32||32||16||16|
|ACEs per ACL||128||1282||64||642|
|QoS policy map||128||128||64||64|
|QoS class map||1024||1024||512||512|
|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 datacenter object. Note that this virtual datacenter 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), 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 a 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(5.1).
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 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.
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(5.1).
Only SSH version 2 (SSHv2) is supported.
For more information, see the Cisco Nexus 1000V Security Configuration Guide, Release 4.2(1)SV1(5.1).
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(5.1).
For more information about the CLI command modes, see the Cisco Nexus 1000V Getting Started Guide, Release 4.2(1)SV1(5.1)
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(5.1).
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, 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(5.1).
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.
The 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 by using the show lacp offload status command.
•The 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, the 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.
Layer 3 VSG
When a VEM communicates with Cisco VSG in Layer 3 mode, an additional header with 94 bytes is added to the original packet. You must set the MTU to a minimum of 1594 bytes to accommodate this extra header for any network interface through which the traffic passes between the Cisco Nexus 1000V and the Cisco VSG. These interfaces can include the uplink port profile, the proxy ARP router, or a virtual switch.
VM Name Display Length Limitation
VM names for VMs on ESX 4.1 hosts that exceed 21 characters are not displayed properly on the VSM. When you use ashow vservice command that displays the port profile name, for example, the show vservice port brief port-profile port-profile-name command, only VMs with names that are 21 characters or less are displayed correctly. Longer VM names may cause the VM name to be truncated, or extra characters to be appended to the VM name. Depending on the network adapter, the name length limitation may vary. For example:
•The E1000 or VMXNET 2 network adapters allow 26-character names. At 27 characters, the word `.eth’ is appended to the VM name. With each addition to the VM name, a character is truncated from the word `.eth’. After 31 characters, the VM name is truncated.
•The VMXNET 3 network adapters allow 21-character names. At 22 characters, the word ` ethernet’ is appended to the VM name. With each addition to the VM name, a character is truncated from the word ` ethernet’. After 30 characters, the VM name is truncated.
Workaround: This is a display issue with ESX Release 4.1 only. Use VM names of 21 characters or less to avoid this issue.
Performing an ISSU from Cisco Nexus 1000V Release 4.2(1)SV1(4) or Release 4.2(1)SV1(4a) to Cisco Nexus 1000V Release 4.2(1)SV1(5.2) using ISO files is not supported. You must use kickstart and system files to perform an ISSU upgrade to Cisco Nexus 1000V Release 4.2(1)SV1(5.2).
This section includes the following topics:
The following are descriptions of the caveats in Cisco Nexus 1000V Release 4.2(1)SV1(5.2). 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
Open Caveat Headline
|1.||CSCti39155||Need to send traffic from the destination VM to learn the vns-binding.|
|2.||CSCti85986||The Cisco Nexus 1000V cannot support more than 245 ports (physical and virtual) per VEM.|
|3.||CSCti98977||Not able to migrate VC/VSM and normal VM when adding host to DVS.|
|4.||CSCtj70071||SNMP V3 traps are not getting generated.|
|5.||CSCtn62514||LACP offload configuration is not persisting in stateless mode.|
|6.||CSCtq04886||Eth_port_sec crash occurs during migration in VC with interface override in VSM.|
|7.||CSCtq92519||CDP does not work for certain NIC cards without VLAN 1 allowed.|
|8.||CSCtr34519||Continuous SNMP polling causes high CPU usage.|
|9.||CSCtr36181||Integrate Apache with netstack.|
|10.||CSCtr55311||Legacy LACP takes 30 minutes to come up after a link flap.|
|11.||CSCts24105||The load-interval counter command configuration is not working.|
|12.||CSCts50066||Post module flap violated port is secured and the secured port is violated.|
|13.||CSCtt07479||A port profile configured with the port-binding static auto command reserves more than the default ports.|
|14.||CSCtt17073||A port profile via VCD fails when done immediately after a switchover.|
|15.||CSCtt24735||Editing a port profile fails with the error message “ERROR: unknown error.”|
|16.||CSCtt40944||In a PVLAN, all mappings are removed when a single mapping is removed.|
|17.||CSCtu10144||A virtual Ethernet interface as trunk has pinning issue in MN ESX hosts.|
|18.||CSCtu17512||The Cisco Nexus 1000V to vShield Manager connection is down after release of VCD, DB, VSM.Note Only applicable with VMware vCloud Director 1.5.1 and vShield Manager 5.0.1.|
|19.||CSCtw93579||Active VSMs CPU utilization is more than 50% when there are 512 groups.|
|20.||CSCtw96064||The show tech-support dvs command does not have output related to DHCP snooping.|
|21.||CSCtx06864||A native VLAN configured on the interface port channel is not programmed on the VEM.|
|22.||CSCtx30435||After upgrading the VEM to Cisco NX-OS Release 4.2(1)SV1(5.1), two Cisco VIBs are installed.|
|23.||CSCty59712||If you add a primary PVLAN as the SPAN/ERSPAN source, its promiscuous trunk members are not added to the SPAN session.|
|24.||CSCty64522||The VEM agent continues running after entering the vem-remove -dcommand.|
|25.||CSCua00940||PPM does not perform configuration checks when you configure a PVLAN in an offline port-profile mode.|
|26.||CSCua02145||“SYSMGR_EXITCODE_FAILURE_NOCALLHOME” error message received while upgrading with ISO images from Release 4.2(1)SV1(4) or 4.2(1)SV1(4a) to Release 4.2(1)SV1(5.2).|
|27.||CSCua06287||Incorrect mapping for ethernet port profile with PVLAN configuration is displayed in the running configuration.|
|28.||CSCua11227||Cannot copy the running configuration from the TFTP server to the current running configuration.|
|29.||CSCua12342||A Link Aggregation Control Protocol (LACP) port channel member port goes to the suspended state when the port is newly added to the LACP port channel, or the port is removed and readded to the LACP port channel.|
|30.||CSCua12592||Password validity is not checked when installing a VSM using an OVA installation.|
|31.||CSCua16092||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.|
|32.||CSCua59482||Traffic is being redirected to the incorrect VSG.|
|33.||CSCtz90492||Cannot install later versions of VIB files using the VEM installer without vCenter Update Manager (VUM).|
Quality of Service
Open Caveat Headline
|1.||CSCtl00949||Configuring child with no service policy command is causing inherit to fail.|
|2.||CSCtq34938||Applying policy fails sharing ACL between two class-maps of same policy.|
|3.||CSCtu36119||QoS marking limitation in VCD environment.|
Open Caveat Headline
|1.||CSCtk65252||PSEC with multiple MAC addresses and PVLAN not supported.|
|2.||CSCtl04632||Port migration with switchover causing ports to go to “No port-profile.”|
|3.||CSCtq89961||Snooping does not get applied on sec VLANs if executed in different order|
|4.||CSCtr06833||Split brain causes pending ACL/QoS transactions into err-disabled.|
|5.||CSCtr09746||Interface configuration fails when veths are nonparticipating due to unreachable module.|
Open Caveat Headline
|1.||CSCti34737||Removing host with Intel Oplin from DVS causes all ports to reset.|
|2.||CSCtk02322||After an ESX host exception, the port group configuration on PNIC is changed.|
|3.||CSCtk07337||Fully qualified domain name/user with port-profile visibility fails.|
|4.||CSCtk10837||Port-profile visibility feature is not able to update permissions.|
|5.||CSCtk53802||Improper sync with vCenter when port-profile names have special characters.|
|6.||CSCts80394||A VEM upgrade fails when the scratch space is a network file system.|
|7.||CSCtt00444||After unregistering Cisco Nexus 1000V on Vshield, the alert timer runs.|
|8.||CSCty78076||VEM upgrade error occurs when using VMware Update Manager.|
|9.||CSCtz90492||The Cisco Nexus 1000V Installation Management Center is not supported in VMware ESX 5.1 hosts.|
|10.||CSCua30356||An existing vAPP cannot be powered down, and a new vAPP cannot be deployed.|
|11.||CSCua40492||When the VEM is disconnected from the VSM (headless mode), the maximum number of vEthernet interfaces limit cannot be connected.|
|12.||CSCua48997||When VIBs are removed from ESX 4.1 hosts in maintenance mode, the hosts return to maintenance mode after reboot.|
|13.||CSCua78262||The incorrect release description name and release note URL is displayed with the ESX/ESXi 4.1.0 offline bundle.|
The following are descriptions of caveats that were resolved in Cisco Nexus 1000V Release 4.2(1)SV1(5.2). The ID links you into the Cisco Bug Toolkit.
Resolved Caveat Headline
|1.||CSCtq34432||The service-policy command leaks to veth-no service-policy command with the wrong policy name.|
|2.||CSCtq34977||Interface in “NoPortProfile” state on mode changes from LACP to MAC pinning.|
|3.||CSCtw50899||Nsmgr pss state and port profiles state after the write erase command.|
|4.||CSCtw56889||Cisco Nexus 1000V does not recompute the UDP checksum when option 82 is inserted.|
|5.||CSCtw69713||A module does not come up if the lowest numbered vmnic on Cisco Nexus 1000V is down.|
|6.||CSCtw72196||Queues are not created when adding a class map in a policy map that has no cl.|
|7.||CSCtx02138||ERSPAN supports an MTU larger than 1500 bytes.|
|8.||CSCtx03892||A migration to Cisco Nexus 1000V multicast with 126.96.36.199 address stopped working.|
|9.||CSCtx32992||Multicast drops count as vEth output drops.|
|10.||CSCtx39449||Module flaps and disconnection of svs connection observed.|
|11.||CSCtx41516||Disable the snmp trap link-status command on a vEthernet interface.|
|12.||CSCtz12186||The show http-server command does not show the status of http and https.|
|13.||CSCua92452||A VMware critical failure is seen when unloading VEM modules during VEM Upgrade with VEM having L3 vmknic Control Interface with QoS and ACL configurations.|
|14.||CSCub36957||The VEM does not send a heartbeat when processing a large amount of Layer 2 broadcasts.|
This section lists the documents used with the Cisco Nexus 1000V and available on Cisco.com at the following URL: