Release Notes for the Cisco Cloud Native BNG Control Plane, Version 2026.01.0
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Release Notes for the Cisco Cloud Native BNG Control Plane, Version 2026.01.0
Release Notes for the Cisco Cloud Native BNG Control Plane, Version 2026.01.0
This Release Notes identifies changes and issues related to the software release of Cisco Cloud Native BNG Control Plane.
The key highlights of this release include:
· Seamless L2TP session continuity during server reboot
Maintain uninterrupted subscriber broadband service during an L2TP server reboot by automatically shifting active sessions to a secondary L2TP instance until the primary returns.
· Periodic reconciliations for ID Manager
Improve resource utilization by automatically cleaning up stale IDs, with configurable reconciliation scheduling (frequency and timing).
· Message-Authenticator validation for RADIUS servers
Strengthen RADIUS security against protocol-level attacks (for example, Blast-RADIUS) by enforcing cryptographic Message-Authenticator validation and silently dropping packets that fail verification.
· Clear RADIUS operational statistics
Simplify monitoring and troubleshooting by allowing operational statistics to be reset for specific or all RADIUS servers or clients, with a confirmation prompt to avoid accidental clears.
· Metrics and label renaming as per convention
Improve operational consistency and usability by aligning metrics and label names with the established naming conventions.
· Enhanced debuggability for subscriber sessions
Speed troubleshooting of cnBNG subscriber issues with new commands that provide deeper visibility into L2TP tunnel state, PPP session event history, and disconnect reasons.
For more information about cnBNG Control Plane and related products, see the Related resources section.
Release lifecycle milestones
The following table provides EoL milestones for Cisco cnBNG Control Plane software:
Table 1. EoL milestone information for cnBNG CP, Release 2026.01.0
| Milestone |
Date |
| First Customer Ship (FCS) |
10-Feb-2026 |
| End of Life (EoL) |
10-Feb-2027 |
| End of Software Maintenance (EoSM) |
10-Feb-2029 |
| End of Vulnerability and Security Support (EoVSS) |
10-Feb-2030 |
| Last Date of Support (LDoS) |
10-Aug-2030 |
This section provides a brief description of the new software features introduced in this release.
Table 2. New software features for cnBNG CP, Release 2026.01.0
| Product impact |
Feature |
Description |
| Software Reliability
|
You can now maintain uninterrupted broadband services for subscribers during an L2TP server reboot. If the primary server restarts, a secondary L2TP instance automatically manages active sessions for affected UPFs until the primary returns, ensuring session continuity and consistent service. |
|
| Ease of Use |
You can now enhance resource utilization and management efficiency by automatically removing stale IDs from the ID manager. This feature allows you configure the frequency and timing of reconciliations to suit your needs. |
|
| Software Reliability
|
You can now protect your RADIUS authentication and accounting traffic from protocol-level attacks such as Blast-RADIUS by enabling Message-Authenticator validation. This feature ensures that all RADIUS packets include a cryptographic Message-Authenticator attribute, which both the client and server validate using a shared secret. If a packet fails validation, the system silently drops it, preventing forged or tampered responses from being accepted. |
|
| Ease of Use |
You can simplify RADIUS server monitoring and troubleshooting by quickly resetting operational statistics as needed. This feature allows you to clear statistics for specific or all servers and clients, with a confirmation prompt to prevent accidental resets. |
|
| Ease of Use |
Metrics and label renaming as per convention |
You can now track the allocation, release, and movement of IP addresses, IDs, and chunks for improved debuggability and auditing. The system records detailed lifecycle events, including timestamps and relevant keys, and writes them to dedicated log files at regular intervals or after a set number of events. |
| Ease of Use |
Enhanced debuggability for subscriber sessions |
You can now quickly diagnose cnBNG subscriber issues with new commands that show detailed L2TP tunnel status, PPP session event history, and disconnect reasons. |
This table lists the open issues in this specific software release.
Note: This software release may contain open bugs first identified in other releases. To see additional information, click the bug ID to access the Cisco Bug Search Tool. To search for a documented Cisco product issue, type in the browser: <bug_number> site:cisco.com
Table 3. Open issues for cnBNG CP, Release 2026.01.0
| Bug ID |
Description |
| Vulnerabilities detected in Nessus scan - Jan release (2026.01.1.i08) |
This section lists compatibility information of the software components/packages that are verified to work with this version of the cnBNG Control Plane software.
Table 4. Compatibility information for cnBNG CP, Release 2026.01.0
| Product |
Supported Release |
| BNG UP (ASR 9K) |
IOS XR Release 26.1.1* |
| SMI CEE |
2026.01.1.08 |
| SMI Cluster Deployer |
2026.01.1.08 |
| SMI Base ISO Image |
24.04.0-20260120 |
*Subject to feature availability.
This section provides information about the release packages associated with cnBNG Control Plane software.
Table 5. Software packages for cnBNG CP, Release 2026.01.0
| Software Package |
Description |
Release |
| bng.2026.01.0.SPA.tgz |
The cnBNG CP offline release signature package. This package contains the cnBNG CP deployment software as well as the release signature, certificate, and verification information. |
2026.01.0 |
| ncs-6.4.8.2-cisco-bng-nc-1.1.2026.01.0 |
The NETCONF NED package. This package includes all the yang files that are used for NF configuration. Note that NSO is used for the NED file creation. |
6.4.8.2 |
| ncs-6.4.8.2-cisco-bng-smi-deployer-2026.01.0 |
NSO Core-Function-Pack |
6.4.8.2 |
Cloud native product version numbering system
The show helm list command displays detailed information about the version of the cloud native product currently deployed.
Image checksum information is available through Cisco.com Software Download Details. To find the checksum, hover the mouse pointer over the software image you have downloaded.
To validate the information, calculate a SHA512 checksum using the information in the following table and verify that it matches the one provided on the software download page.
To calculate a SHA512 checksum on your local desktop, see this table.
Table 6. Checksum calculations per operating system
| Operating System |
SHA512 checksum calculation command examples |
| Microsoft Windows |
Open a command line window and type the following command: > certutil.exe -hashfile <filename.extension> SHA512 |
| Apple MAC |
Open a terminal window and type the following command: $ shasum -a 512 <filename.extension> |
| Linux |
Open a terminal window and type the following command: $ sha512sum <filename.extension> OR $ shasum -a 512 <filename.extension> |
| Note: <filename> is the name of the file. <extension> is the file type extension (for example, .zip or .tgz). |
|
If the SHA512 checksum does not match, we advise you not to attempt upgrading any systems with the corrupted software image. Download the software again and verify the SHA512 checksum again. If there is a constant mismatch, please open a case with the Cisco Technical Assistance Center.
This table provides key resources and links to the support information and essential documentation for cnBNG Control Plane and related products.
Table 7. Related resources and additional information
| Resource |
Link |
| cnBNG Control Plane documentation |
|
| cnBNG User Plane documentation |
|
| Physical BNG documentation |
|
| SMI documentation |
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