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When changing the FCoE VLAN from 3121 to 3120 while FI is in FC Switch mode, initiators can FLOGI and obtain FCID but fail to PLOGI to target ports, resulting in indefinite timeouts. Admin down/up of the FC link or port-channel resolves the issue. This change causes path loss in ESXi, with host logs showing successful FLOGI and FCID assignment but PLOGI timeouts.

4.3(2b)A

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Cisco UCS server is unable to start the PNUOS because BIOS/bt/biosSecureVars/dbx_os file with an invalid certificate prevents PNUOS from operating. The dbx_os file holds certificates added by the operating system and specifies which certificates are prohibited from loading. The cause of the failure is a secure boot violation and following error message is displayed:

Invalid signature detected. Check secure boot policy in setup.

4.3(3a)A

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During migration from Cisco UCS 6300 FI Series to Cisco UCS 6500 FI Series, configuring FC storage ports results in errors, indicating that FC Breakout is not supported.

4.2(3i)A

In Cisco UCSX-I-9108-25G, one I/O Fabric Module (IFM) fails to read temperature sensor data, resulting in the maximum fan speed and non-responsiveness to GUI requests. To ensure that both IFMs correctly identify their slots and come back online, reinsert IFM 2 and wait for it to come back online, then reinsert IFM 1.

UCS Manager servers with firmware version 4.2(1f) and Cisco Custom VMWare ESXi OS are missing host inventory annotations. Some key-value pairs are either mismatched or missing in UCSM managed objects, although they are correct in the UCS Tools inventory within ESXi. To resolve this issue, manually initiate the inventory collection from Intersight.

Several ECCs are observed on a single DIMM with no fault from Cisco UCS Manager in Cisco UCS C-Series and B-Series M5 and M6 servers equipped with 64GB DIMMs (UCS-MR-X64G2RW) and ADDDC enabled.

In a setup equipped with Cisco UCS 6454 FI, all the IOMs display the following fault:

Cisco UCS 6454 FI operating on release 4.2(1l) might experience difficulties establishing FC (Fibre Channel) port-channels with 93180YC-FX switches that are on release 10.2(6)M.

There is a possibility that the port-channel could enter an error-disabled state as soon as the links are activated.

Cisco UCS 6454 FI operating on any 4.2(1) release cause a surge in CPU utilization to 100% for bladeAG, resulting in the process exhausting available memory.

As a result, this prevents the peer Fabric Interconnect from being programmed during startup.

Upon deletion of a VLAN from the VLAN group that is utilized by both Uplinks and vNICs, the vNICs momentarily lose connection, displaying an ENM Pinning failure error.

The vNICs are expected to automatically restore their connection and become operational again. Cisco UCS Manager indicate the vNIC status as down and attribute the cause to an ENM pinning source failure.

In Cisco UCS Manager release 4.3(3), 4.3(2), and 4.2(3), an issue has been identified where SSH logins for users authenticated through LDAP, RADIUS, or TACACS fail on Cisco UCS 6500 and 6400 series FIs, but not on Cisco UCS 6300 FIs.

The SSH login succeeds if there is an active HTTP/HTTPS web session or an existing SSH session for the same user. This issue does not affect GUI or telnet logins for remotely authenticated users, nor does it impact SSH logins using local Cisco UCS Manager credentials.

Cisco UCS 6454 Fabric Interconnect experiences failures attributed to a High Availability (HA) policy reset, specifically due to Link Layer Discovery Protocol (LLDP) related issues. System logs obtained via show system reset-reason confirm that the device is automatically performing resets due to an HA policy.

A critical defect has been identified in the Cisco UCS Manager where the Data Management Engine (DME) crashes due to an instance id not found error.

Additional symptoms include the inability to access the Cisco UCS Manager GUI, non-functionality of cluster management services, and a core dump indicated by the show pmon state command via SSH.

The problem is not firmware-specific and can impact any Cisco UCS Manager domain. Although the data plane and server operations of the domain remain unaffected, there is no workaround for this issue, and affected environments may require restoration from a backup.

During the ComputeRackUnitDiscover:OobStorageConfig process on Cisco UCS C240 M5SX servers, the discovery or association often failed with an error message Remote-Invocation-Error: Waiting for storage subsystem to initialize.This issue was observed following the server firmware upgrade to 4.2(3d) and appeared to affect servers using 3.8Tb or 7.6Tb drives.

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Cisco UCS 6454 Fabric Interconnect displayed svc_sam_samcproxy process failure messages.

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The Cisco UCS 6400 series and 6500 series Fabric Interconnects operating on 4.3(2.230117) version observed persistent issues of storage space exhaustion and firmware upgrade failures.

4.3(2.230117)

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In a setup equipped with Cisco UCS 6454 Fabric Interconnects, reboots during auto-install, without user acknowledgement. This issue was observed during the upgrade process of the infrastructure firmware from version 4.1(3e)A to version 4.2(1i)A.

4.1(3e)A

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After upgrading Cisco UCS 6332-16UP Fabric Interconnects to Infrastructure Firmware 4.2(2c)A, chassis power chart shows abnormal readings.

4.2(2c)A

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Cisco UCS 6454 Fabric Interconnect crash due to Machine Check Exception (MCE) errors.

4.2(2c)A

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4.1(3b)

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In a setup equipped with Cisco UCS 15000 Series VIC adapters and ESXi OS, the adapters may become unreachable and be in hung state. Internal PO goes down and the backplane connection link also shows as link down. All the vNICs/vHBAs are also in a down state.

4.2(2a)

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Cisco UCS 2200/2300/2400 IOMs may go offline after upgrading to release 4.2(3d).

4.2(3d)

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CRC errors are seen in a setup equipped with Cisco UCS 2408 IOM connected to Cisco UCS B-Series server HIF ports.

4.2(2a)

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Third-party SFP goes into unsupported state after upgrading to release 4.2(2a) or later.

4.2(2a)

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SNMP configuration does not restore in NXOS after SNMPD restart.

4.2(2c)

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On a Cisco UCS 6454 Fabric Interconnect, on initial boot or after an erase configuration, the fabric interconnect did not boot to the initial configuration prompt. After finishing boot, the fabric interconnect showed a login prompt with the default hostname of switch.

4.2(3b)

In a cluster setup with Cisco UCS 6400 series FI or 6536 FI, after a server reboot, if the MAC address is learned through the impacted FI, then the ARP is unable to resolve on any OS. This issue does not impact the servers, which are not rebooted.

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Cisco UCS 6454 FI crashes and recovers due to following error:

4.2(1d)

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In a setup equipped with Cisco UCS 6454 FI, when IP Unicast/Subnet-broadcast packet destined to Link-Layer broadcast is received over Mgmt port of FI, the packet is routed over Mgmt0 Interface. This results in FI sending back the received packet with the Mgmt0 source MAC address leading to upstream device on the network detecting the same destination IP address with a different source MAC address.

4.2(3e)

iSCSI LUN discovery fails for servers in Intersight Managed Mode with CHAP Authentication enabled.

A X210c M6 Compute Node was configured with iSCSI profile with Challenge Handshake Authentication Protocol (CHAP) authentication enabled. On rebooting the server, iSCSI boot LUN in BIOS is not found. Even though CHAP is enabled in iSCSI boot profile of Intersight from BIOS in iSCSI configuration, it is observed that Authentication mode appears as none.

Multiple instances of hung Samcproxy is observed in a setup equipped with Cisco UCS 6400 FI. There may also be other miscellaneous faults on the domain related to Samcproxy being in a bad state.

4.2(3c)

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Unexpected reboot is observed during normal operation in Cisco UCS 6536 FI and Cisco UCS 6400 FI series FIs.

4.2(3c)

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4.2(3c)

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MTS buffer stuck on vsh.bin process.

The process crashes and impacts other functionality once the limit is reached.

4.2(3c)

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In a setup equipped with Cisco UCS 6400 FI, Multicast streams are not accepted by the server.

4.2(3c)

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While upgrading the Infrastructure firmware from 4.2(1d) to 4.2(2a), 4.2(3b), or 4.2(3c) release, if there is a time lag between two IFM upgrades, Redfish query fails on one of the IFM during this time interval. It may be seen as a connection failure in IMM.

In a UCS X-Series Chassis, using the fan UCSX-9508-FAN, an alert is seen stating "[Chassis fan module] has a critical speed threshold condition". This behavior may be seen on multiple chassis and may occur on different fan modules. A fault gets raised and then gets cleared on its own. The issue is observed during LOW fan speed conditions. If the fault persists and does not clear on its own, physically re-seat the fan. If the fault persists even after re-seating, reach out to Cisco TAC as it could potentially indicate a separate problem.

In a UCS X-Series Chassis, using the fan UCSX-9508-FAN, an alert is seen stating "[Chassis fan module] has a critical speed threshold condition". This behavior may be seen on multiple chassis and may occur on different fan modules. A fault gets raised and then gets cleared on its own. The issue is observed during LOW fan speed conditions. If the fault persists and does not clear on its own, physically re-seat the fan. If the fault persists even after re-seating, reach out to Cisco TAC as it could potentially indicate a separate problem.

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In Cisco UCS 6500 Series FI, extra member port in uplink port fails to forward the broadcast traffic. This happens because the Fibre Channel over Ethernet (FCoE) member port gets incorrectly included in the uplink port.

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In Cisco UCS 6500 Series FI, the fabric port fails to forward the unicast traffic in the UDP port range 100-150

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FI switch link with QSFP-40G-LR4 status appears as Up for more than a minute even after shutting the remote end port or pulling the cable. FI switch is connected to C-Series server with Cisco 1400 Series adapter.

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For Cisco UCS 6500 Series FI, IGMP 16k limit notification is seen on Syslog even on sending only one igmp join from Appliance server to FI.

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A convergence time of more than 100 sec is observed for IP multicast traffic during fabric failover. This is observed when 3K VLAN on FI and N9K with Snoop Enabled are configured on all VLAN. More than 5 querier are configured on N9K on different VLANs. Three groups are joined on different VLAN from different Host/Servers.

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Fiber Channel Storage port is stuck at Init after FI reboot. The port is connected to 32G Netapp and FCoE traffic is sent to it before the reboot of Fabric Interconnect B.

snmpd_log core is affected when FI is rebooted after enabling FC uplink port and breakout interfaces.

The Intelligent Fabric Management (IFM) experiences reboot loop due to a faulty Power Supply Unit in the chassis. A faulty PSU is indicated by non solid green PSU LED.