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Cisco Bug: CSCum86841 - DHCP will not ack in 3.9.1 while 3.2.1 did

Last Modified

Mar 24, 2019

Products (13)

  • Cisco IOS
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
  • Cisco ASR 901-4C-F-D Router
  • Cisco ASR 901-6CZ-FT-D Router
  • Cisco ME 3600X-24CX-M Switch
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Known Affected Releases


Description (partial)

Symptom: When upgrading from Cisco IOS XE Release 3.2S to Cisco IOS XE Release 3.9S, the  DHCP server NACKs the client while sending renew. This worked in Cisco IOS XE Release 3.2S and not in Cisco IOS XE Release 3.9S.
Conditions: This symptom occurs when the DHCP server is provisioned to give out an IP address using a host pool (where the MAC address is tied to IP address). After the client gets the IP address, it downloads the configurations from the TFTP server and update the new MAC address after which when the client sends a renew, the DHCP server NACKs the client till the binding is present.
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