Cisco IOS XE 17.16 Update Version Cisco IOS XE 17.16.1a

Release Notes for Cisco Catalyst 8200 and Catalyst 8300 Series Edge Platforms, Cisco IOS XE 17.16.x. Cisco IOS XE 17.16.1a adds new SD-WAN, security, logging, and routing features, and includes multiple resolved and open bugs.

• Disablement of weak SSH algorithms: ssh-rsa is disabled by default on port 22 to improve security.
• Configure source interface for High-Speed Logging and Syslog for security logging, including firewall message logging with minimal packet-processing impact.
• UTD Container Management for SD-Routing devices to detect, upgrade, and manage Unified Threat Defense security virtual images.
• Support for Enrollment over Secure Transport (EST) using HTTP-based authentication.
• Cisco Unified Border Element (CUBE) adds Secure Communications Interoperability Protocol (SCIP) support in preview mode.

• Resolved issues include crashes, trace decode errors, PKI trustpoint password handling, crypto profile push failures, config sync problems, and NHRP-related reloads.
• Open issues include MACsec lockups, authentication failures after power cycle, PPPoE session hangs, BFD/TLOC-Ext problems, and traffic blackholing after power-cycle.

• Configure cellular interfaces using Feature Parcels in Cisco SD-WAN Manager without CLI dependency.
• Asymmetric carrier delay for separate link-up and link-down notification timing.
• Enhanced show power output with detail and history keywords.
• Support for monitoring TCP and RTP traffic on DMVPN tunnels using ART monitor and Media monitor.
• Cisco ThousandEyes Enterprise Agent onboarding on SD-Routing devices.
• Speed test enhancement for site-to-site bandwidth testing over DMVPN tunnels.
• Support for network slicing on 5G standalone networks.
• Enhanced Segment Routing over IPv6 data plane support, including eBGP Inter-AS, PCE-delegated path computation, and OAM traffic engineering.

• SCIP support in CUBE is available in preview mode with limited functionality and no service-level objective for support response times.
• Open bugs remain in 17.16.1a, including ROMMON auto-upgrade failures, MACsec issues, authentication failures after power cycle, and traffic loss scenarios.

• Cisco IOS XE 17.16.1a is the first release in the 17.16.x series for these platforms.
• Review Cisco Field Notices before upgrading to determine whether your platform is affected.
• ROMMON compatibility is required; Cisco provides minimum and recommended ROMMON versions for each platform.
• For some Catalyst 8200/8200L platforms, upgrading via IOS XE 17.12.4 or manually upgrading ROMMON to 17.6(8.1r) may be required before moving to 17.15.1a or later.
• ROMMON upgrade steps include checking the current version, downloading the package, copying it to flash, running upgrade rom-monitor, and reloading.

• Cisco Feature Navigator
  https://cfnng.cisco.com/
• Cisco Field Notice overview
  https://www.cisco.com/c/en/us/support/web/field-notice-overview.html
• Cisco field notices by product category
  https://www.cisco.com/c/en/us/support/web/tsd-products-field-notice-summary.html#%7Etab-product-categories
• Cisco software download portal
  https://software.cisco.com/#

Product Information

Vendor: Cisco

Product: IOS XE

Product type: Other

Platform: Network Device

Variant: 17.16

Version: Cisco IOS XE 17.16.1a

Vendor release date: Dec 22, 2024

Original release notes: View on vendor site

Published on updatealert.io: Jun 5, 2026

Description: Network operating system software for Cisco enterprise routers and switches.