Cisco IOS XE 17.16 Update Version Cisco IOS XE 17.16.1a

Release notes for Cisco ASR 1000 Series running Cisco IOS XE 17.16.x. Cisco IOS XE 17.16.1a is the first release in this series and adds SD-Routing, logging, ThousandEyes, CUBE SCIP preview support, and disables `ssh-rsa` by default on port 22.

• Disables the weak ssh-rsa algorithm by default on port 22 to improve security.
• Adds support for Secure Communication Interoperability Protocol (SCIP) voice and video codec in CUBE, available in preview mode.
• Improves security logging by allowing source interfaces for High-Speed Logging (HSL) and SysLog.
• Includes fixes related to PKI, IKEv2, and RSA weak key handling.

• Fixes multiple crashes and tracebacks, including OMPd, IOSD, NHRP, and platform information retrieval issues.
• Resolves SD-Routing and SD-WAN configuration issues such as YANG default IKEv2 authorization policy handling and vManage crypto profile push problems.
• Fixes cellular and interface behavior issues, including last-resort mode status and show cellular output enhancements.
• Addresses PKI and certificate-related problems, including trustpoint password encryption handling and OCSP revocation-check crashes.
• Fixes data policy commit failures, config sync issues in stack members, and cflowd export-spread problems.

• UTD Container Management for SD-Routing devices, including detection, upgrade, and management of UTD Security Virtual Images.
• Source interface configuration for High-Speed Logging and SysLog in Cisco SD-WAN Manager.
• Site-to-site speed test enhancement over DMVPN tunnels for SD-Routing devices.
• Binary trace retrieval for IOS process events without enabling DMVPN event tracing.
• Enhanced show cellular 0/x/0 connection output with APN and cellular link uptime.
• Onboard Cisco ThousandEyes Enterprise Agent on SD-Routing devices.

• Open bugs remain for 17.16.1a, including traffic blackholing after power-cycle, login failures after power-cycle, EPC crashes on 100Gb links, and several SD-WAN and routing issues.

• Cisco IOS XE 17.16.1a is the first release for Cisco ASR 1000 Series routers in the 17.16.x train.
• Cisco notes that the SCIP feature is in preview mode and may have limited functionality or incomplete dependencies.
• Cisco recommends reviewing product field notices to determine whether affected software or hardware platforms require action.

• Cisco field notice overview
  https://www.cisco.com/c/en/us/support/web/field-notice-overview.html
• Cisco field notice summary
  https://www.cisco.com/c/en/us/support/web/tsd-products-field-notice-summary.html#%7Etab-product-categories

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.