Release-specific Caveats and Workarounds

This section lists the caveats and workarounds when setting up or upgrading the software for each Cisco IOS XR release.

Caveats and Workarounds

Release 7.4.1

There are no caveats for system upgrade to Cisco IOS XR Release 7.4.1.

Release 7.4.2

CSCvp19524: When downgrading from Cisco IOS XR Release 7.4.2 to any release lower than Cisco IOS XR Release 7.0.1, it is necessary to remove AAA user configurations from SYSADMIN/XR VMs before proceeding with the downgrade.

Release 7.5.1

CSCvp19524: When downgrading from Cisco IOS XR Release 7.5.1 to any release lower than Cisco IOS XR Release 7.0.1, it is necessary to remove AAA user configurations from SYSADMIN/XR VMs before proceeding with the downgrade.

Release 7.5.2

CSCvp19524: When downgrading from Cisco IOS XR Release 7.5.2 to any release lower than Cisco IOS XR Release 7.0.1, it is necessary to remove AAA user configurations from SYSADMIN/XR VMs before proceeding with the downgrade.

Release 7.6.2

CSCvp19524: When downgrading from Cisco IOS XR Release 7.6.2 to any release lower than Cisco IOS XR Release 7.0.1, it is necessary to remove AAA user configurations from SYSADMIN/XR VMs before proceeding with the downgrade.

Release 7.7.2

CSCvp19524: When downgrading from Cisco IOS XR Release 7.7.2 to any release lower than Cisco IOS XR Release 7.0.1, it is necessary to remove AAA user configurations from SYSADMIN/XR VMs before proceeding with the downgrade.

Release 7.8.1

CSCvp19524: When downgrading from Cisco IOS XR Release 7.8.1 to any release lower than Cisco IOS XR Release 7.0.1, it is necessary to remove AAA user configurations from SYSADMIN/XR VMs before proceeding with the downgrade.

Release 7.8.2

CSCvp19524: When downgrading from Cisco IOS XR Release 7.8.2 to any release lower than Cisco IOS XR Release 7.0.1, it is necessary to remove AAA user configurations from SYSADMIN/XR VMs before proceeding with the downgrade.

Release 7.9.1

CSCvp19524: When downgrading from Cisco IOS XR Release 7.9.1 to any release lower than Cisco IOS XR Release 7.0.1, it's necessary to remove AAA user configurations from SYSADMIN/XR VMs before proceeding with the downgrade.

  1. CSCwd30936: When downgrading from Cisco IOS XR Release 7.9.1 to an older release, the "ema_server_sdr" process may crash.

Release 7.9.2

  1. CSCvp19524: When downgrading from Cisco IOS XR Release 7.9.2 to any release lower than Cisco IOS XR Release 7.0.1, it is necessary to remove AAA user configurations from SYSADMIN/XR VMs before proceeding with the downgrade.

  2. CSCwd30936: When downgrading from Cisco IOS XR Release 7.9.2 to an older release, the "ema_server_sdr" process may crash.

Release 7.10.1

  1. CSCvp19524: When downgrading from Cisco IOS XR release 7.10.1 to any release lower than Cisco IOS XR Release 7.0.1, it is necessary to remove AAA user configurations from SYSADMIN/XR VMs before proceeding with the downgrade.

  2. CSCwd30936: When downgrading from Cisco IOS XR Release 7.10.1 to an older release, the "ema_server_sdr" process may crash.

  3. SR695094155: When upgrading the software version of an ASR 9000 router with an mLACP/ICCP Redundancy Model setup, ensure that both the active and standby nodes are upgraded to the same IOS XR version.

Release 24.1.1

Table 1. Upgrade Caveats for Cisco IOS XR Release 24.1.1 and Later

To Upgrade From Cisco IOS XR Release...

To Cisco IOS XR Release...

Bridge SMU Required

Caveats
Release 7.11.1 Release 24.1.1

CSCwi95358, CSCwh61644

A*
Release 7.10.2 Release 24.1.1
Release 7.10.1 Release 24.1.1
Release 7.9.2.1 Release 24.1.1
Release 7.9.2 Release 24.1.1
Release 7.8.2 Release 24.1.1
Release 7.7.2 Release 24.1.1
Release 7.6.2 Release 24.1.1
Release 7.5.2 Release 24.1.1
Release 7.4.2 Release 24.1.1
Release 7.3.2 Release 24.1.1

A*: Ensure that bridge SMUs (CSCwi95358, CSCwh61644) are installed before system upgrade.


Note

CSCwi95358:

  • This is a hitless SMU in Cisco IOS XR Release 7.4.1. Installing the SMU does not impact traffic and services. Do not reload the system when this SMU is installed.

  • This is a reload SMU in Cisco IOS XR Release 7.3.2, which reloads the system when installed.

CSCwh61644—When installed following a software upgrade, both the Line Card (LC) and the Route Processor (RP) become active and function properly.

Table 2. Downgrade Caveats for Cisco IOS XR Release 24.1.1 and Earlier

From

To

Revisions to Include

Caveats
Release 24.1.1 Release 7.11.1

CSCwi95358

A*
Release 24.1.1 Release 7.10.2
Release 24.1.1 Release 7.10.1

CSCwi95358, CSCwh61644

A*, B*
Release 24.1.1 Release 7.9.2.1
Release 24.1.1 Release 7.9.2
Release 24.1.1 Release 7.8.2
Release 24.1.1 Release 7.7.2
Release 24.1.1 Release 7.6.2
Release 24.1.1 Release 7.5.2
Release 24.1.1 Release 7.4.2

CSCwi95358, CSCwh61644

A*, B*, C*
Release 24.1.1 Release 7.3.2

A*: Ensure that the additional enhancement (CSCwi95358) is included.

B*: Ensure that the additional enhancement (CSCwh61644) is included.


Note

CSCwi95358:

  • This is a hitless SMU in Cisco IOS XR Release 7.4.1. Installing the SMU does not impact traffic and services. Do not reload the system when this SMU is installed.

  • This is a reload SMU in Cisco IOS XR Release 7.3.4, which reloads the system when installed.

CSCwh61644—When installed following a software upgrade, both the Line Card (LC) and the Route Processor (RP) become active and function properly.