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Cisco Bug: CSCsy75718 - dhcp-proxy won't reclaim lease with same PPP user on new VAI within 9s

Last Modified

Jan 30, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(31)SB14

Description (partial)

Symptoms: On a PPP aggregator using dhcp-proxy-client functionality, in a
 situation where a PPP client session is torn down and then renegotiated within
 5 seconds, the DHCP proxy client may send a DHCP RELEASE for the previous DHCP
 handle after the new DHCP handle (created as a result of new IPCP CONFREQ
 address 0.0.0.0) has accepted the same IP address allocation from the offnet
 DHCP Server. This results in the offnet DHCP server having no record of the
 lease as it exists on the PPP aggregator which causes future addressing conflicts.
 
 Conditions: The issue appears to be Day 1, reported on a Cisco 7200/NPE-400 and
 7200/NPE-G2 that is running Cisco IOS Release 12.4T, 12.4M, or 12.2SB.
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