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Cisco Bug: CSCun25154 - DHCP client behaviour change between 15.0(2)SE2 and 15.0(2)SE4

Last Modified

Apr 17, 2019

Products (147)

  • Cisco IOS
  • Cisco Catalyst 3560E-12D-E Switch
  • Cisco Catalyst 3750V2-24FS Switch
  • Cisco Catalyst 3560E-48PD-SF Switch
  • Cisco Catalyst 3560X-48T-E Switch
  • Cisco Catalyst 2960S-F48FPS-L Switch
  • Cisco Catalyst 2960C-8TC-S Switch
  • Cisco Catalyst 3560X-48P-S Switch
  • Cisco Catalyst 3560-12PC-S Compact Switch
  • Cisco Catalyst 3560CG-8TC-S Compact Switch
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Known Affected Releases

15.0(2)SE4 n/a

Description (partial)

DHCP client behaviour change between 15.0(2)SE2 and 15.0(2)SE4.

When DHCP client sends a renew to the DHCP server then the Ack is sent back from the server and the Ack is reaching to Client box but not reaching back to DHCP process because the UDP socket is already closed.
Due to which the renew will fail and the client connectivity will be lost for few time until the Client sends the rebind and gets the IP address again.
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