Cisco IOS XE 17.17 Update Version 17.17.1

Cisco Catalyst 9300 Series Switches Cisco IOS XE 17.17.1 adds CTS role-based enforcement, LLDP on the management port for 9300-L, and new programmability and security enhancements. It also renames `ecomode` to `auto-off` and includes caveat CSCvu14870.

• Strict-KEX strengthens SSH by terminating connections on unexpected or out-of-sequence packets and resetting sequence numbers after key exchange.
• CTS Role-Based Enforcement enables SGACL enforcement at the port-channel level for Cisco TrustSec.
• Support for sensitive CLIs with CRUD on Meraki adds secure SNMPv3 user configuration via NETCONF with AES, DES, and DES3 encryption and avoids plaintext exposure in running-config and get-config.
• Cisco TrustSec can be configured only on physical interfaces, not logical interfaces.
• MACsec switch-to-host connections in an overlay network are not supported; Cisco recommends switch-to-switch MACsec only.

• CTS Role-Based Enforcement for SGACL enforcement at the port-channel level.
• LLDP support on the management port of Cisco Catalyst 9300-L Series Switches for Zero-Touch provisioning.
• On-change subscriptions for location-aware YANG models.
• New YANG data models are available for this release.
• Support for sensitive CLIs with CRUD on Meraki via NETCONF.

• CSCvu14870: Cat9k archive command can cause a bulk sync failure and reload the standby switch.

• The hw-module switch ecomode command is renamed to hw-module switch auto-off, and ecomode under stack power configuration is replaced with auto-off.
• Use install commands for upgrades and downgrades; request platform software commands are deprecated.
• For install-mode upgrades, the switch must boot from flash:packages.conf.
• When downgrading from newer releases to older ones, microcode may need to be downgraded manually for some UPOE models if install commands are not used.
• ROMMON in the primary SPI flash upgrades automatically on first upgrade to a release with a newer ROMMON; the golden SPI flash ROMMON must be upgraded manually.
• Starting with Cisco IOS XE 17.10, diffie-hellman-group14-sha1, hmac-sha1, hmac-sha2-256, and hmac-sha2-512 are removed from the default SSH algorithm list.
• Hidden commands now require service internal for Category 1 commands and generate a %PARSER-5-HIDDEN syslog message when used.

• Cisco IOS XE YANG models for 17.17.1
  https://github.com/YangModels/yang/tree/main/vendor/cisco/xe/17171
• Transceiver Module Group compatibility matrix
  https://www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_tables_list.html

Product Information

Vendor: Cisco

Product: IOS XE

Product type: Other

Platform: Network Device

Variant: 17.17

Version: 17.17.1

Vendor information published: Mar 31, 2025

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.