Quality of Service Configuration Guide, Cisco IOS XE 17.17.x (Catalyst 9300 Switches) - Configuring Auto-QoS

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/17-17/configuration_guide/qos/b_1717_qos_9300_cg/configuring_auto_qos.html

Published

2025-03-31

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco copyright; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• On Catalyst 9300, auto qos voip cisco-phone trusts incoming QoS labels only when CDP detects a Cisco IP phone on the port (conditional trust), and does not trust them when no phone is detected. in context
• Cisco says not to use auto qos voip cisco-phone for IP phones that support video, because it overwrites the video packets' DSCP markings and misclassifies them. in context
• On Catalyst 9300, auto qos voip trust is meant for uplinks to a trusted switch or router and trusts incoming QoS labels unconditionally, while auto qos voip cisco-softphone treats the port as untrusted and classifies and polices the traffic. in context

Cite this source record

APA

WarmTransfer. (2025, March 31). Quality of Service Configuration Guide, Cisco IOS XE 17.17.x (Catalyst 9300 Switches) - Configuring Auto-QoS. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cat9300-1717-auto-qos

BibTeX

@misc{warmtransfer-cisco-cat9300-1717-auto-qos,
  title  = {Quality of Service Configuration Guide, Cisco IOS XE 17.17.x (Catalyst 9300 Switches) - Configuring Auto-QoS},
  author = {{WarmTransfer}},
  year   = {2025},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cat9300-1717-auto-qos},
  note   = {Cisco Systems, accessed 2026-09-24}
}