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Cisco Bug: CSCul90078 - DHCP server allocates a wrong IP if a client roams in selecting state

Last Modified

Apr 17, 2019

Products (17)

  • Cisco IOS
  • Cisco ME 3600X-24TS-M Switch
  • Cisco 7301 Router
  • Cisco 7206 Router
  • Cisco 7204 Router
  • Cisco 7206VXR Router
  • Cisco 7202 Router
  • Cisco 7600 Series Route Switch Processor 720 with Multilayer Switch Feature Card
  • Cisco 7600 Series Route Switch Processor 720 with 10 Gigabit Ethernet Uplinks
  • Cisco ME 3600X-24FS-M Switch
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Known Affected Releases

15.2(4)S 15.2(4)S4.21 15.4(1.13)S

Description (partial)

IOS DHCP server allocates a wrong IP if a client roams to a different interface during selecting state.
Below is the scenario. In this example, the client moves from VLAN 627 to VLAN 1627.

1. In VLAN 627, A client sends a Discover and Router replies Offer. The biding is Selecting state.
2. Before sending Request, the client moves to another VLAN 1627.
3. Then the client sends Request based on the info received in #1.
4. Somehow Router replies Ack with the info of the original VLAN, even though the client moved to another VLAN/interface. IP allocation is completed with the old info.

Client moves to another interface during Selecting state.
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