Release Notes for Cisco NCS 540 Series Routers, Cisco IOS XR Release 25.1.2
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Cisco NCS 540 Series Routers, Release 25.1.2
Cisco NCS 540 Series Routers, Release 25.1.2
Cisco IOS XR Release 25.1.2 is a maintenance release for Cisco NCS 540 Series routers.
For more details on the Cisco IOS XR release model and associated support, see Software Lifecycle Support Statement - IOS XR.
There are no new software features introduced in this release.
There is no new hardware introduced in this release.
There are no changes in behavior in this release.
There are no open caveats in this release.
There are no known issues in this release.
Compatibility Matrix for EPNM and Crosswork with Cisco IOS XR Software
The compatibility matrix lists the version of EPNM and Crosswork that are supported with Cisco IOS XR Release in this release.
Table 1. Compatibility Matrix
| Cisco IOS XR |
Crosswork |
EPNM |
| Release 25.1.2 |
System requirements
Use the show hw-module fpd command in EXEC and Admin mode to view the hardware components with their current FPD version and status. The status of the hardware must be CURRENT; Running and Programmed version must be the same. You can also use the show fpd package command in Admin mode to check the fpd versions.
Software Version
To verify the software version running on the router, use show version command in the EXEC mode.
Router# show version
Thu Jul 3 14:20:35.326 IST
Cisco IOS XR Software, Version 25.1.2
Copyright (c) 2013-2025 by Cisco Systems, Inc.
Build Information:
Built By : swtools
Built On : Wed Jul 2 15:27:28 PDT 2025
Built Host : iox-ucs-049
Workspace : /auto/srcarchive12/prod/25.1.2/ncs540/ws
Version : 25.1.2
Location : /opt/cisco/XR/packages/
Label : 25.1.2-iso
cisco NCS-540 () processor
System uptime is 47 minutes
The following tables list the supported base images and optional packages and their corresponding file names.
Visit the Cisco Software Download page to download the Cisco IOS XR software images.
Table 2. Release 25.1.2 software for N540-24Z8Q2C-SYS, N540-ACC-SYS, and N540X-ACC-SYS
| Package |
Filename |
Description |
| Base image |
||
| IOS XR Base Image |
ncs540-mini-x-25.1.2.iso |
IOS XR mandatory base image. |
| USB Boot Package |
ncs540-usb_boot-25.1.2.zip |
Package required to perform USB Boot. Includes the same packages as the base image. |
| Optional packages not included in the base image |
||
| IOS XR Manageability |
ncs540-mgbl-1.0.0.0-r2512.x86_64.rpm |
Supports Extensible Markup Language (XML) Parser, Telemetry, Netconf, gRPC and HTTP server |
| IOS XR MPLS |
ncs540-mpls-1.0.0.0-r2512.x86_64.rpm ncs540-mpls-te-rsvp-1.0.0.0-r2512.x86_64.rpm |
Supports MPLS and MPLS Traffic Engineering (MPLS-TE) |
| IOS XR Security |
ncs540-k9sec-1.0.0.0-r2512.x86_64.rpm |
Supports MACsec and 802.1X |
| IOS XR ISIS |
ncs540-isis-1.0.0.0-r2512.x86_64.rpm |
Supports ISIS |
| IOS XR OSPF |
ncs540-ospf-1.0.0.0-r2512.x86_64.rpm |
Supports OSPF |
| IOS XR Lawful Intercept |
ncs540-li-1.0.0.0-r2512.x86_64.rpm |
Supports Lawful Intercept (LI) |
| IOS XR Multicast |
ncs540-mcast-1.0.0.0-r2512.x86_64.rpm |
Supports Multicast |
| IOS XR EIGRP |
ncs540-eigrp-1.0.0.0-r2512.x86_64.rpm |
Supports EIGRP |
| IOS XR LI-CTRL |
ncs540-lictrl-1.0.0.0-r2512.x86_64.rpm |
Supports LI-CTRL |
Table 3. Release 25.1.2 Software for N540-24Q8L2DD-SYS, N540-24Q2C2DD-SYS, N540X-16Z4G8Q2C-A/D, N540-28Z4C-SYS-A/D, N540X-12Z16G-SYS-A/D, N540-12Z20G-SYS-A/D, N540-FH-CSR-SYS, N540X-16Z8Q2C-D, and N540-FH-AGG-SYS
| Package |
Filename |
Description |
| Base Image |
||
| IOS XR Base Image |
ncs540l-x64-25.1.2.iso |
IOS XR base image with mandatory packages. The base ISO image also includes the following optional packages: xr-bgp xr-cdp xr-eigrp xr-ipsla xr-is-is xr-k9sec xr-lictrl xr-lldp xr-mcast xr-mpls-oam xr-netflow xr-ospf xr-perf-meas xr-perfmgmt xr-rip xr-telnet xr-track These optional packages are also included in NCS540l-iosxr-25.1.2.tar. |
| USB Boot Package |
ncs540l-usb_boot-25.1.2.zip |
Package required to perform USB Boot. Includes the same packages as the base image. |
| Optional packages not included in the base image |
||
| IOS XR Telnet (xr-telnet) |
NCS540l-iosxr-25.1.2.tar |
Supports Telnet |
| IOS XR EIGRP (xr-eigrp) |
NCS540l-iosxr-25.1.2.tar |
Supports EIGRP |
| IOS XR CDP (xr-cdp) |
NCS540l-iosxr-25.1.2.tar |
Supports CDP |
| IOS XR k9sec (xr-k9sec) |
NCS540l-k9sec-rpms.25.1.2.tar |
Supports 802.1X |
| IOS XR RIP (xr-rip) |
NCS540l-iosxr-25.1.2.tar |
Supports RIP |
Table 4. Release 25.1.2 Software for N540X-4Z14G2Q-A/D, N540X-8Z16G-SYS-A/D, N540-6Z14S-SYS-D, N540-6Z18G-SYS-A/D, and N540X-6Z18G-SYS-A/D
| Package |
Filename |
Description |
| Base image |
||
| IOS XR Base Image |
ncs540l-aarch64-25.1.2.iso |
IOS XR base image with mandatory packages. The ISO image also includes the following optional packages: xr-bgp xr-cdp xr-eigrp xr-ipsla xr-is-is xr-k9sec xr-lictrl xr-lldp xr-mcast xr-mpls-oam xr-ncs540l-mcast xr-ncs540l-netflow xr-netflow xr-ospf xr-perf-meas xr-perfmgmt xr-rip xr-telnet xr-track These optional packages are also included in NCS540l aarch64 iosxr optional rpms-25.1.2.tar. |
| USB Boot Package |
ncs540l-aarch64-usb_boot-25.1.2.zip |
Package required to perform USB Boot. Includes the same packages as the base image. |
| Optional packages not included in the base image |
||
| Package |
Filename |
Description |
| IOS XR Telnet (xr-telnet) |
NCS540l-aarch64-iosxr-optional-rpms-25.1.2.tar |
Supports Telnet |
| IOS XR EIGRP (xr-eigrp) |
NCS540l-aarch64-iosxr-optional-rpms-25.1.2.tar |
Supports EIGRP |
| IOS XR CDP (xr-cdp) |
NCS540l-aarch64-iosxr-optional-rpms-25.1.2.tar |
Supports CDP |
| IOS XR k9sec (xr-k9sec) |
NCS540l-aarch64-k9sec-rpms.25.1.2.tar |
Supports 802.1X |
| IOS XR RIP (xr-rip) |
NCS540l-aarch64-iosxr-optional-rpms-25.1.2.tar |
Supports RIP |
Table 5. Related resources
| Document |
Description |
| An interactive tool that assists in locating features introduced across Cisco IOS XR releases and platforms. |
|
| Information about Smart Licensing Using Policy solutions and their deployment on IOS XR Routers. |
|
| CCO Documentation for Cisco NCS 540 Series Routers |
|
| Search by product family, product ID, data rate, reach, cable type, or form factor to determine the transceivers that Cisco hardware device supports. |
|
| Search by release number, error strings, or compare release numbers to view a detailed repository of error messages and descriptions. |
|
| Select the MIB of your choice from a drop-down to explore an extensive repository of MIB information. |
|
| A user-friendly reference designed to easily explore and understand the various data models supported in Cisco IOS XR platforms and releases. |
|
| Repository containing the folders with yang data models introduced and enhanced in every IOS XR release. |
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