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Cisco Bug: CSCuk45205 - RPFv6: with DCEF, packets are not dropped by RPF as expected

Last Modified

Dec 23, 2014

Products (1)

  • Cisco IOS

Known Affected Releases

12.0S 12.2(17.10)S 12.2(17.10)SPI5f 12.3 12.3(4.4a)

Description (partial)

Symptoms: When you deconfigure IP version 6 (IPv6) or IPv6 unicast Reverse 
Path Forwarding (uRPF) on a Cisco router that runs IPv6 Cisco Express 
Forwarding (CEF), the configuration may not be removed from a Versatile 
Interface Processor (VIP) or line card, although it will be removed from the 
Route Switch Processor (RPS) or Route Processor (RP). This situation may cause 
IPv6 or IPv6 uRPF to continue to be applied to packets that are switched via 
distributed CEF (dCEF).

Conditions: This symptom is observed on a Cisco 7500 series and Cisco 12000 
series only when dCEF is enabled.
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