# Changes in Release 26.06

```eval_rst
.. contents:: Table of Contents
   :depth: 2
   :local:
```

(release-26.06)=
## New Functionality

* Nokia SR Linux supports [SR-MPLS](module-sr-mpls) over IPv6 and [MPLS/VPN](mpls-l3vpn-supported-platforms) services.
* FortiOS supports [OSPFv3](module-ospf).
* **[netlab install](netlab-install)** scripts work on Ubuntu 26.04
* You can [build custom Linux Vagrant boxes](linux-build) and set the full box name with the **[netlab libvirt package](netlab-libvirt-package)** command.

**Minor changes and improvements**

* The **libvirt** installation script installs Vagrant release 2.4.9.
* The **[netlab defaults](netlab-defaults)** command can display selected defaults as YAML or exported shell environment variables.
* Plugins can define [CLI hooks](dev-plugin-cli-hooks) executed before or after **netlab up** and **netlab down** command steps.
* The `libvirt.machine_type` [node attribute](libvirt-vm-settings) gives you more control over VM machine type selection.
* Search-path handling for provider and custom templates is now configurable.
* The validation code supports the `_value_to_dict` attribute and user-defined data types, making flexible attribute definitions easier to implement.
* Python package (`networklab`) is defined in `pyproject.toml`

(release-26.06-device-features)=
## New Device Features

FortiOS:
* OSPFv3 (IPv6 OSPF)

Nokia SR Linux:
* SR-MPLS over IPv6
* MPLS/VPN support

(release-26.06-device-fixes)=
## Fixes in Configuration Templates

Arista EOS:
* Do not configure OSPF interface parameters like timers and router priority on loopbacks

Nokia SR Linux:
* Fixed the LDP configuration template
* Null update/delete values generated by templates no longer break configuration deployment
* Use the new containerlab node types consistently

(release-26.06-breaking)=
## Breaking changes

* SR Linux `clab.type` values are now validated against documented hardware variants, and _netlab_ expects the hyphenated type names used in the documentation. Existing lab topologies that use legacy aliases or unsupported values might need updates.

(bug-fixes-26.06)=
## Bug Fixes

* Set high MTU only on libvirt private networks to avoid recent libvirt failures on public/direct links (#3404)
* Compare topology download target names correctly when loading a lab topology from a URL
* **netlab test** runs probes only for providers being tested (#3437)
* Integration tests can complete custom validation scenarios even when `up` or `initial` steps are skipped
* Improve error reporting for provider configuration templates
* Validation code now creates Box objects with `get_box`, handles user-defined `_alt_types`, checks `_required` on empty dictionaries, and extracts type-validation attributes consistently (#3438, #3439, #3444, #3447)
* FRR BGP prefix validation queries VRF BGP tables (#3446, #3454)
* Validate `routing.prefix` min/max values against prefix length and address-family limits (#3455)
* CI and integration tests generate shorter diffs and clearer startup messages

(doc-fixes-26.06)=
## Documentation Fixes

* Document custom Linux/libvirt packaging workflows, including Ubuntu 26.04 caveats and full box names