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Cisco Bug: CSCvt59070 - PI: NTP will not authenticate with open source NTP servers using SHA1 and SHA2 keys

Last Modified

Sep 30, 2020

Products (9)

  • Cisco IOS
  • Cisco 4221 Integrated Services Router
  • Cisco 4321 Integrated Services Router
  • Cisco 4431 Integrated Services Router
  • Cisco 4331 Integrated Services Router
  • Cisco 4461 Integrated Services Router
  • Cisco Cloud Services Router 1000V
  • Cisco 4351 Integrated Services Router
  • Cisco 4451-X Integrated Services Router

Known Affected Releases

17.1.1

Description (partial)

Symptom:
The router will fail to sync and take time from an NTP server (any linux box).

available hmac-sha1 and hmac-sha2-256  option in IOS-NTP, are not working if peer is using opensource NTP.

Conditions:
The router is configured to authenticate to the server via symmetric key using an algorithm of hmac-sha1 and hmac-sha2-256.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
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