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Cisco Bug: CSCsz56765 - BAC CNR extensions post more than one generate batch for same packet

Last Modified

Feb 22, 2014

Products (1)

  • Cisco Broadband Access Center for Telco and Wireless

Known Affected Releases

2.7(1.5) 4.0(1.3)

Description (partial)

BAC CNR extensions post more than one generate batch for same packet 

The BAC CNR extensions support VALIDATE commands which if the validation fails will result in a batch being posted to the RDU requesting (re)generation of the device configuration.

VALIDATE commands that support continuing execution of the existing device configuration allow the BAC DHCP extensions to process additional VALIDATE commands. If the validation fails those commands will also post a batch to the RDU.

The RDU will drop the duplicate batches, but this requires the RDU to perform additional work, causing a performance issue and reducing scalibility.

This issue occurs frequently in the presence of cable modems with cloned MAC addresses, since the packets sent by the cloned modems usually do not match the packets sent by the original CM, resulting in multiple validation failures.
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