September 2026

September 29 - Unicon v26.9

Module Versions

Modules	Versions
unicon.plugins	v26.9
unicon	v26.9

Changelogs

unicon

New

• unicon.core.pluginmanager

  • Added generic support for optional submodel-aware plugin registration and selection for devices that define a submodel.

  • Added fallback to the model plugin when a matching submodel plugin is unavailable.

• unicon.adapters.topology

  • Added forwarding of an optional device submodel to the Unicon connection factory.

• c9800-cl

  • Uses model=c9800 with submodel=c9800_cl and falls back to the C9800 model plugin when a matching submodel plugin is unavailable.

• unicon.bases.connection

  • Modified Connection

    • Added optional connection_dialog to connect() so callers can provide a replacement dialog for initial state detection and break-boot recovery. Existing behavior is unchanged when it is omitted.

    • Added optional skip_initialization to connect() so callers can stop after initial state detection without hostname learning, token learning, or normal connection initialization.

• unicon.bases.linux.connection_provider

  • Modified BaseLinuxConnectionProvider

    • Added replacement-dialog and skip_initialization handling while preserving existing behavior when omitted.

• unicon.bases.routers.connection_provider

  • Modified RP connection providers

    • Added replacement-dialog handling across single-RP, dual-RP, stack/SVL, and quad-RP connections while preserving normal connection behavior when no replacement is supplied.

Fix

• unicon.eal.backend.pty_backend

  • Raise typed EOF errors for closed or failed PTY spawns instead of exposing low-level select errors.

  • Safely clean up failed PTY sessions without unnecessary disconnect delays, while preserving subprocess exit output for connection-failure dialogs.

  • Add PTY child-liveness detection so recovery can distinguish exited sessions from live shared or inherited sessions.

  • Modified Spawn.close

    • Terminate a spawned process that is still running but is not a child of the closing process. os.waitpid() raises ECHILD in that case, which was treated as “already exited”, leaving telnet/ssh sessions alive and holding terminal server console ports after disconnect()/destroy().

• unicon.statemachine

  • Modified StateMachine add_state

    • Propagate the hostname learning pattern to newly added states so enabling hostname learning does not generate patterns containing None.

• unicon.bases.routers.connection_provider

  • Modified BaseStackRpConnectionProvider designate_handles

    • Identify the active stack handle from terminal line 0 when console and switch order differ.

    • Preserve existing standby and member handle behavior.

unicon.plugins

Fix

• generic plugin

  • Modified enable credential selection

    • Prefer an explicitly configured enable credential over fallback login passwords when a terminal-server post action reaches the device prompt.

    • When no explicit enable credential exists, use the login credential that actually reached the device prompt instead of blindly selecting the first bad-password fallback credential.

  • Modified enable authentication failure handling

    • Raise UniconAuthenticationError when a device rejects an enable password, allowing callers such as Genie Clean to select their authentication-recovery path.

    • Preserve login fallback credential behavior for login authentication failures.

• ios xr

  • Modified initial connection recovery to discard uncommitted changes and clear an SDR running-configuration inconsistency from exec mode.

  • Kept essential-ops mode separate from SDR inconsistency recovery.

• unicon.plugins.confd

  • Modified ConfdConnectionProvider init_handle

    • Learn a runtime hostname before executing initialization commands.

• unicon.plugins.sdwan.viptela

  • Modified ViptelaPatterns

    • Recognize runtime vSmart hostnames and distinguish exec prompts from configuration prompts.

• iosxr

  • Modified Configure

    • Retry complete configuration transactions when a running-configuration lock blocks commit.

    • Report the active lock details when the retry limit is reached.