Release Notes for UCC SMF and cnSGWc, Release 2026.03.4
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Ultra Cloud Core - Session Management and Serving Gateway Function, Release 2026.03.4
Ultra Cloud Core - Session Management and Serving Gateway Function, Release 2026.03.4
This Release Notes identifies changes and issues related to the software release of 5G Converged Core Session Management Function (SMF) and Serving Gateway Control Plane Function (cnSGWc).
For more information about Ultra Cloud Core - Session Management Function and Serving Gateway Control Plane Function (cnSGWc), see the Related resources section.
Release lifecycle milestones
The following table provides EoL milestones for Cisco UCC SMF and UCC cnSGWc software:
Table 1. EoL milestone information for UCC SMF and cnSGWc, Release 2026.03.4
| Milestone |
Date |
| First Customer Ship (FCS) |
23-July-2026 |
| End of Life (EoL) |
23-July-2026 |
| End of Software Maintenance (EoSM) |
22-Jan-2028 |
| End of Vulnerability and Security Support (EoVSS) |
31-Jan-2028 |
| Last Date of Support (LDoS) |
31-Jan-2029 |
These milestones and the intervals between them are defined in the Cisco Ultra Cloud Core (UCC) Software Release Lifecycle Product Bulletin available on cisco.com.
There are no new software features introduced in this release.
This section provides a brief description of the behavior changes introduced in this release.
Table 2. Behavior changes for UCC SMF and cnSGWc, Release 2026.03.4
| Description |
Behavior changes |
| HPLMN S-NSSAI propagation in roaming 4G-to-5G handovers |
Previous Behavior: During a roaming 4G-to-5G handover where SMF acted as a vSMF, the S-NSSAI returned by the hSMF in the N16 PduSessionCreatedData was neither stored nor propagated. Consequently, the N11 SM Context Created response sent to the AMF contained an empty or incorrect sNssai, leading to inconsistent slice information for the session. New Behavior: SMF now extracts the S-NSSAI from the N16 create response and stores it as the HPLMN S-NSSAI. This value is then used to populate the sNssai field in the N11 create response sent to the AMF during the handover. This ensures compliance with 3GPP TS 29.502. If no HPLMN S-NSSAI is received, the system falls back to the previous behavior of using the existing sNssai. Customer Impact: This change ensures that the AMF receives accurate slice information for roaming 4G-to-5G handover sessions. This restores slice consistency across network functions and ensures smoother handover continuity without requiring any configuration changes. |
This table lists the resolved issues in this specific software release.
Note: This software release may contain bug fixes first introduced 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. Resolved issues for UCC SMF and cnSGWc, Release 2026.03.4
| Bug ID |
Description |
| vSMF-hplmnnssai not sent in the n1n2 message during 4G to 5G. |
Open issues
There are no open issues in this specific software release.
This section lists compatibility information of the Cisco UCC software products that are verified to work with this version of the UCC SMF and cnSGWc software.
Table 4. Compatibility information for UCC SMF and cnSGWc, Release 2026.03.4
| Product |
Supported Release |
| Ultra Cloud Core SMI |
2026.03.1.08 |
| Ultra Cloud CDL |
2.3.0 |
| Ultra Cloud Core UPF |
2026.03.0 |
| Ultra Cloud cnSGWc |
2026.03.4 |
This section provides information about the release packages associated with UCC SMF and cnSGWc software.
Table 5. Software packages for UCC SMF and cnSGWc, Release 2026.03.4
| Software Package |
Description |
Release |
| ccg-2026.03.4.SPA.tgz |
The SMF and cnSGWc offline release signature package. This package contains the SMF deployment software, NED package, as well as the release signature, certificate, and verification information. |
2026.03.4 |
| ncs-6.4.8.3-ccg-nc-1.1.2026.03.4.tar.gz |
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. |
6.4.8.3 |
| ncs-6.1.14-ccg-nc-1.1. 2026.03.4.tar.SPA.tgz |
6.1.14 |
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 related Ultra Cloud Core (UCC) products.
Table 7. Related resources and additional information
| Resource |
Link |
| SMF documentation |
|
| cnSGWc documentation |
|
| SMI documentation |
|
| UPF documentation |
|
| Service request and additional information |
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