Cisco Firepower 4100/9300 FXOS Release Notes, 2.8(1)

This document contains release information for Cisco Firepower eXtensible Operating System (FXOS) 2.8(1).

Use these Release Notes as a supplement with the other documents listed in the documentation roadmap:


The online versions of the user documentation are occasionally updated after the initial release. As a result, the information contained in the documentation on supersedes any information contained in the context-sensitive help included with the product.


The Cisco Firepower security appliance is a next-generation platform for network and content security solutions. The Firepower security appliance is part of the Cisco Application Centric Infrastructure (ACI) Security Solution and provides an agile, open, secure platform that is built for scalability, consistent control, and simplified management.

The Firepower security appliance provides the following features:

  • Modular chassis-based security system—Provides high performance, flexible input/output configurations, and scalability.

  • Firepower Chassis Manager—Graphical user interface provides a streamlined, visual representation of the current chassis status and allows for simplified configuration of chassis features.

  • FXOS CLI—Provides command-based interface for configuring features, monitoring chassis status, and accessing advanced troubleshooting features.

  • FXOS REST API—Allows users to programmatically configure and manage their chassis.

What’s New

New Features in FXOS

Fixes for various problems (see Resolved Bugs in FXOS

New Features in FXOS

Fixes for various problems (see Resolved Bugs in FXOS

New Features in FXOS

Fixes for various problems (see Resolved Bugs in FXOS

Cisco FXOS 2.8.1 introduces the following new features:

Table 1. New Features in FXOS 2.8.1



Support for Firepower 4112 security appliances

For more information about Firepower 4112 security appliances, see the Cisco Firepower 4112, 4115, 4125, and 4145 Hardware Installation Guide

Support for Firepower Threat Defense 6.6

For more information about Firepower 6.6, see the Cisco Firepower Release Notes, Version 6.6.0.

Support for ASA 9.14(1)

For more information about ASA 9.14(1), see the Release Notes for the Cisco ASA Series, 9.

FXOS API Explorer

The FXOS REST API, available on the Firepower chassis, includes an API Explorer that describes the resources and JSON objects available for your programmatic use. The Explorer provides information about the attribute-value pairs in each object, and you can “try out” the various HTTP methods in real time.

To access the FXOS API Explorer, either navigate to Help > API Explorer in the Firepower Chassis Manager interface, or edit the Firepower Chassis Manager URL to point to /api/api-explorer/index.html (for example, https//

Support for VLAN 2.8.1 subinterfaces on a cluster type interface (multi-instance use only)

For use with multi-instance clusters, you can now create VLAN subinterfaces on cluster type interfaces. Because each cluster requires a unique cluster control link, VLAN subinterfaces provide a simple method to fulfill this requirement. You can alternatively assign a dedicated EtherChannel per cluster. Multiple cluster type interfaces are now allowed.

Firepower Chassis Manager changes for combined FXOS FPRM and FXOS Chassis Tech Support troubleshooting logs

The information logged in the FXOS FPRM and FXOS Chassis Tech Support logs are now combined. You can now view all FPRM and tech support log information using the tech-support chassis 1 detail command.

Note the following FXOS CLI and Chassis Manager interface changes:

  • show tech-support fprm detail command is deprecated, in favor of tech-support chassis 1 detail

  • FPRM log file is deprecated

Ability to disable auto-negotiation on 1G optical SFP ports for Firepower 4100/9300

You can now disable auto-negotiation on 1G optical SFP ports for Firepower 4100 and 9300 devices by switching between [Yes] and [No] on the port.

SSH server support for ECDSA

The Firepower 4100/9300 FXOS CLI now has the following support:

  • The generation and zeroization of ECDSA keys with curves of 256, 384, and 521.

  • The following SSH host key algorithms: ecdsa-sha2-nistp256, ecdsa-sha2-nistp384, ecdsa-sha2-nistp521

Fixes for various problems

For more information, see Resolved Bugs in FXOS

Software Download

You can download software images for FXOS and supported applications from one of the following URLs:

For information about the applications that are supported on a specific version of FXOS, see the Cisco FXOS Compatibility guide at this URL:

Important Notes

  • In FXOS 2.4(1) or later, if you are using an IPSec secure channel in FIPS mode, the IPSec peer entity must support RFC 7427.

  • When you configure Radware DefensePro (vDP) in a service chain on a currently running Firepower Threat Defense application on a Firepower 4110 or 4120 device, the installation fails with a fault alarm. As a workaround, stop the Firepower Threat Defense application instance before installing the Radware DefensePro application.


    This issue and workaround apply to all supported releases of Radware DefensePro service chaining with Firepower Threat Defense on Firepower 4110 and 4120 devices.

  • Attention

    The FXOS image is fully supported if it is already installed on your security appliance. However, based on the fix for CSCvy95497, the FXOS image was removed and replaced with the image FXOS to avoid any issues or confusions arising out of this bug.

    For information about how to install a firmware update and the fixes included in each update, see Cisco Firepower 4100/9300 FXOS Firmware Upgrade Guide.

  • When you upgrade a network or security module, certain faults are generated and then cleared automatically. These include a “hot swap not supported” fault or a “module removed when in online state” fault. If you have followed the appropriate procedures, as described in the Cisco Firepower 9300 Hardware Installation Guide or Cisco Firepower 4100 Series Hardware Installation Guide, the fault(s) are cleared automatically and no additional action is required.

System Requirements

  • You can access the Firepower Chassis Manager using the following browsers:

    • Mozilla Firefox—Version 42 and later

    • Google Chrome—Version 47 and later

    • Microsoft Internet Explorer—Version 11 and later

    We tested FXOS 2.8(1) using Mozilla Firefox version 42, Google Chrome version 47, and Internet Explorer version 11. Other versions of these browsers are expected to work. However, if you experience any browser-related issues, we suggest you use one of the tested versions.

Upgrade Instructions

You can upgrade your Firepower 9300 or Firepower 4100 series security appliance to FXOS 2.8(1) if it is currently running any FXOS 2.0(1) or later build.

For upgrade instructions, see the Cisco Firepower 4100/9300 Upgrade Guide.

Installation Notes

  • An upgrade to FXOS 2.8(1) can take up to 45 minutes. Plan your upgrade activity accordingly.

  • If you are upgrading a Firepower 9300 or Firepower 4100 series security appliance that is running a standalone logical device or if you are upgrading a Firepower 9300 security appliance that is running an intra-chassis cluster, traffic does not traverse through the device while it is upgrading.

  • If you are upgrading a Firepower 9300 or a Firepower 4100 series security appliance that is part of an inter-chassis cluster, traffic does not traverse through the device being upgraded while it is upgrading. However, the other devices in the cluster continue to pass traffic.

  • Downgrade of FXOS images is not officially supported. The only Cisco-supported method of downgrading an image version of FXOS is to perform a complete re-image of the device.

Adapter Bootloader Upgrade

FXOS 2.8(1) provides additional testing to verify the security module adapters on your security appliance. After installing FXOS or later, you might receive a critical fault similar to the following indicating that you should update the firmware for your security module adapter:

Critical F1715 2017-05-11T11:43:33.121 339561 Adapter 1 on Security Module 1 requires a critical firmware upgrade. Please see Adapter Bootloader Upgrade instructions in the FXOS Release Notes posted with this release.

If you receive this, use the following procedure to update the boot image for your adapter. Note that this procedure may result in a traffic disruption, and thus should be performed during a maintenance window to avoid business impact.

  1. Connect to the FXOS CLI on your Firepower security appliance. For instructions, see the “Accessing the FXOS CLI” topic in the Cisco Firepower 4100/9300 FXOS CLI Configuration Guide, 2.8(1) or Cisco Firepower 4100/9300 FXOS Firepower Chassis Manager Configuration Guide, 2.8(1).

  2. Enter the adapter mode for the adapter whose boot image you are updating:

    fxos-chassis# scope adapter 1/security_module_number/adapter_number

  3. Enter show image to view the available adapter images and to verify that fxos-m83-8p40-cruzboot. is available to be installed:

    fxos-chassis /chassis/server/adapter # show image
    Name Type Version
    --------------------------------------------- -------------------- -------
    fxos-m83-8p40-cruzboot. Adapter Boot 4.0(1.62)
    fxos-m83-8p40-vic. Adapter 4.0(1.51)
  4. Enter update boot-loader to update the adapter boot image to version

    fxos-chassis /chassis/server/adapter # update boot-loader 4.0(1.62)
    Warning: Please DO NOT reboot blade or chassis during upgrade, otherwise, it may cause adapter to become UNUSABLE!
    After upgrade has completed, blade will be power cycled automatically
    fxos-chassis /chassis/server/adapter* # commit-buffer
  5. Enter show boot-update status to monitor the update status:

    fxos-chassis /chassis/server/adapter # show boot-update status
    State: Updating
    fxos-chassis /chassis/server/adapter # show boot-update status
    State: Ready
  6. Enter show version detail to verify that the update was successful:


    Your show version detail output might differ from the following example. However, verify that Bootloader-Update-Status is “Ready” and that Bootloader-Vers is 4.0(1.62).

    fxos-chassis /chassis/server/adapter # show version detail
    Adapter 1:
    Running-Vers: 5.2(1.2)
    Package-Vers: 2.2(2.17)
    Update-Status: Ready
    Activate-Status: Ready
    Bootloader-Update-Status: Ready
    Startup-Vers: 5.2(1.2)
    Backup-Vers: 5.0(1.2)
    Bootloader-Vers: 4.0(1.62)

Open and Resolved Bugs

The open and resolved bugs for this release are accessible through the Cisco Bug Search Tool. This web-based tool provides you with access to the Cisco bug tracking system, which maintains information about bugs and vulnerabilities in this product and other Cisco hardware and software products.


You must have a account to log in and access the Cisco Bug Search Tool. If you do not have one, you can register for an account.

For more information about the Cisco Bug Search Tool, see the Bug Search Tool Help & FAQ.

Open Bugs

The following table lists select bugs open at the time of this Release Notes publication:

Table 2. Open Bugs Affecting FXOS 2.8(1)
Identifier Description


FXOS / ASA multi context changing mgmt ip will remove interface allocation on logical pp instance


FXOS call home address validation does not accept common name without domain prefix


Firepower Chassis Manager Showing Smart Agent Disabled after upgrade to 2.7.1


Confusing message about 'without removing the physical hardware' during Acknowledge Security Module


SNMP cored multiple times resulting FXOS hap reset


FXOS - Recover hwclock of service module from corruption due to simultaneous write collision


FCM should say is not possible to change AAA server when same protocol is configured for Auth


the SSH and console of firepower4110 is not working


All FTW interfaces link flap at random times


"Link not connected" error after reboot when using WSP-Q40GLR4L transceiver on FPR9K-NM-4X40G


FP 4120 svc_sam_dcosAG crashed with crash type:139


Removing FAN module from the device doesn’t change the value of cfprEquipmentFanModuleStatsSuspect


Multiple shut/no shut on N9K causes link failure if connected to FP9300 with WSP-Q40GLR4L xceiver


FXOS sends Link Down SNMP trap when the link is Up when changing interface status from FCM


duplicate default network control policy in GUI


extra "Local Disk 3" displayed on FPR9300

Resolved Bugs in FXOS

The following table lists the previously release-noted and customer-found bugs that were resolved in FXOS

Table 3. Resolved Bugs in FXOS

Caveat ID Number



Chassis SSD firmware upgrade may be prevented improperly.

Resolved Bugs in FXOS

The following table lists the previously release-noted and customer-found bugs that were resolved in FXOS

Table 4. Resolved Bugs in FXOS

Caveat ID Number



Backplane Eth1/9 link keeps DOWN until reboot the chassis


FXOS: some interface transition logs have no reason


FXOS FTD Multi Instance CPU cores shared between different instances


Reject the NTP server on the MIO side when the stratum value is higher than device can handle


TD2 does not load balance MPLS across backplane interfaces and sends it all to first interface


FXOS - AAA/RADIUS - NAS-IP Field set to 127.0.01


Firepower may reboot for no apparent reason


SNMP polling stopped working on active device in HA


FP2100 - SNMP: incorrect values returned for Ethernet statistics polling


MsgLayer[PID]: Error : Msglyr::ZMQWrapper::registerSender() : Failed to bind ZeroMQ Socket


No utility to handle XFS corruption on 2100/1000 series Firepower devices


FXOS: Voltage on DC PSU displayed with wrong values from the 'show stats'


FTD/ASA creates coredump file with "!" character in filename (zmq changes (fxos) for CSCvv40406 )


Message appearing constantly on diagnostic-cli


KP fxos snmp has uninit strings for entPhysicalSerialNum,entPhysicalAssetID on EPM index


Firepower 1010 Series stops passing traffic when a member of the port-channel is down


Error "No such file or directory" happended when using "copy ftp: wrokspace:" in FXOS 2.8.1


4100/9300: Cannot associate port channel / interface to App


"Link not connected" error when using WSP-Q40GLR4L transceiver and Arista switch


ASA upgrade failed with: "CSP directory does not exist - STOP_FAILED Application_Not_Found"


Radius Key with the ASCII character " configured on FXOS does not work after chassis reload.


ENH: Rename status BYPASS-FAIL for fail-to-wire inline pairs


FP2100 ASA - 1 Gbps SFP in network module down/down after upgrade to


FXOS upgrade fails with error "does not support application instances of deployment type container"


Need handling of rmu read failure to ignore link state update when link state API read fails


FXOS reporting old FTD version after FTD upgrade to 6.7.0


Pre-login-banner not showing on FCM WebUI


Firepower memory leak in svc_sam_dcosAG


FXOS clock sync issue during blade boot up due to "MIO DID NOT RESPOND TO FORCED TIME SYNC"


ENH: add a way to disable the FQDN check


Sudo before 1.9.5p2 has a Heap-based Buffer Overflow, allowing privile


FXOS show fault warning code F4526902


Not able to set Bangkok time zone in FPR 2110


Time sync do not work correctly for ASA on FPFPR2100 series platform


FXOS : 'Memory leak' may casue appAG process traceback and reload


FTD 2110 ascii characters are disallowed in LDAP password


When ASA upgrade fails, version status is desynched between platform and application


FP93K // // SSH sessions not clearing. More than 32 FPRM CLI sessions are not allowed


Upgrade from 6.6.0-90 to 6.7.0-1552 failed at 000_start/ on FP1150


FTW port mode is always "Disabled"


FXOS code changes to complement fix of ndclient fix introduced by CSCvy07654


FTD container goes to install failed with error "Container support requires Blade reinitialization"


FXOS: Unexpected reload of applications running on security blade triggered by chassis


The 4k/9k SUP should reboot the blade when it is hung due to CATERR


BCM SDK patch 6.5.8 - Parity error in TDM Calendar memories causes traffic drop after SER correction


Display message ???nothing to update??? if the SSD installed is not applicable for the firmware update


FXOS does not check the total amount of available memory with a missing or failed DIMM


PortAG Core file detected while testing UUT Image


Need to include AAA logs/debugs in FPRM tar bundle


FP9300 chassis reboots after adding 16th Instance in SM-56


ASA netsnmp:: Log rotate for snmp log file


snmpd is respawning frequently on fxos for FP21xx device


FP1100: starting with, /isan not offloaded to /mnt/boot


[6.7.0-1963] vFTD-HA: snmpwalk to standby vFTD is getting timeout


KP-fxos Changing SNMP_FREE to snmp_free_pdu while freeing pdu.


enhance debug prints in switch_driver code


TPK/WA -- FEC/Storm Ctrl errors on KP/WM filling up logs


Negative values seen in the output of show portmanager counters


9.14MR3: snmpwalk got failed with [Errno 146] Connection refused error.

Resolved Bugs in FXOS

The following table lists the previously release-noted and customer-found bugs that were resolved in FXOS

Table 5. Resolved Bugs in FXOS

Caveat ID Number



ASA module fails to upgrade (GracefulStopApp FSM failure)


Timezone in "show clock" is different from which in "show run clock"


QuoVadis root CA decommission on Firepower 9300/4100 Supervisor


MIO SSD upgraded to wrong firmware version.


QW:4112:FXOS traceback and reload after upgrade to


Need to support firmware upgrade for SSD in FXOS

Resolved Bugs in FXOS

The following table lists the previously release-noted and customer-found bugs that were resolved in FXOS

Table 6. Resolved Bugs in FXOS
Identifier Description


statsAG memory leak


ma_ctx*.log consuming high diskspace on FPR4100/FPR9300 despite the fix for CSCvx07389


VIC adapter kernel crash at boot


Memory leak : DME process may traceback generating core on Firepower 4100/9300 (M5 series only)


CRUZ paloview is not accessible on release build

Resolved Bugs in FXOS

The following table lists the previously release-noted and customer-found bugs that were resolved in FXOS

Table 7. Resolved Bugs in FXOS
Identifier Description


core_svc_sam_dme found after upgrade


LCMB: Dynamic medium page allocation can lead to memory depletion


hostname transmission: Hostname is null, Device sends hostname as "none" to SA


Add stack support for FTD/NGIPS to improve the troubleshoot of processes in D state


ASA Traceback in thread name: CERT API memory leak while processing CRLs


FXOS: svc_sam_dcosAG process crash on FirePower 4100/9300


connector log exhausted disk space


BEMS01080980 - bad allowed_cpus in /etc/sf/arc.conf probably from cspCfg.xml


"Link not connected" error after reboot when using QSFP-40G-LR4 transceiver on FPR9K-NM-4X40G


Eval of FXOS for Apache vulnerabilities CVE-2020-1927 and CVE-2020-1934


An extra whitespace in cluster group name of FTD causing Secondary to be kicked out.


An extra whitespace in cluster group name of FTD causing data unit to be kicked out.


Firepower 4100/9300 - Fail-to-wire (FTW) EPM ports link flap during show tech collection


CIAM: nfs-utils 1.3.0


ASA app-instance restart without audit log or trigger


FXOS Multi-Instance fault F0479 Virtual Interface link state is down


FXOS dynamically learning mac-address of external machine causing outage


FXOS sending additional internal VLAN TAG leading to ARP update failure on devices.

CSCvv24712 - 4 node QP longevity setup with SNMPD core on Primary


Duplicate ARP replies for IPv4 management address on FTD


FXOS portAG memory leak during periodical interface polls


Upgrade : FSM status can show incorrect value after upgrade

Resolved Bugs in FXOS

The following table lists the previously release-noted and customer-found bugs that were resolved in FXOS

Table 8. Resolved Bugs in FXOS
Identifier Description


FXOS L3 Egress Object Resource Leak due to Port-Channel Member Interface Flaps


NTP script error leading to clock drift and traffic interruption


FXOS displays a WSP-Q40GLR4L transceiver from show interface as type QSFP-40G-LR4


OSPF multicast mac getting removed from l2-table causing OSPF to fail


Need dedicated Rx rings for failover and OSPF on Firepower platform - Cruz fix


Firepower 4100 series all FTW interfaces link flap at the same time but occur rarely


"Link not connected" error after reboot when using WSP-Q40GLR4L transceiver on FPR9K-NM-4X40G


FPR4100/9300: Packet drops during the transition of BYPASS to NON-BYPASS when device is rebooted


FP 4120 svc_sam_dcosAG crashed with crash type:139


extra "Local Disk 3" displayed on FPR9300 (improved solution)


fpr4100 snmp polling to fxos memory-usage shows incorrect value compare with CLI's output


Instance start failed due to VNIC configuration error


9300/4100 : Port-channel down after chassis software upgrade.


Enhance common-msglyr library to set/get ZMQ_XPUB_NODROP channel property


WR6, WR8 and LTS18 commit id update in CCM layer (sprint 85)


FXOS ASA race condition leading to cluster join failure and network outage


Service module not returning error to supervisor when SMA resources are depleted


Blade unresponsive after several months of Uptime


Firepower 9300 FPR-NM-4X100G or FPR-NM-2X100G interface may blackhole port-channel member traffic


Multi-instance Portchannel VLANs not programmed correctly causing internal traffic loss

Resolved Bugs in FXOS

The following table lists the previously release-noted and customer-found bugs that were resolved in FXOS

Table 9. Resolved Bugs in FXOS
Identifier Description


Ftd app-instance is stuck in install failed with INSTALL_ERROR. Application internal script Error.


Port-channels are in suspended state after upgrade


The global upgrade button is grayed out even though one security module is up


FXOS Cruz Adapter doesn't validate data sent by logical device causing dropped offloaded packets


Interface not associated to MI instance even though it shows in chassis manager as allocated


Cluster node management connectivity lost after reboot


FTD may not become online after installing vDP and upgrading FXOS to version 2.4.1


Bootstrap configuration is not updated after FTD version downgrade


" hostname transmission sts" script is getting failed due to exception Hostname null


FXOS fault F0479 Virtual Interface link state is down

Online Resources

Cisco provides online resources to download documentation, software, and tools, to query bugs, and to open service requests. Use these resources to install and configure Firepower software and to troubleshoot and resolve technical issues.

Access to most tools on the Cisco Support & Download site requires a user ID and password.

Contact Cisco

If you cannot resolve an issue using the online resources listed above, contact Cisco TAC:

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