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Cisco Bug: CSCuk39876 - CEF/MPLS: ip address still exists in VRF FIB RP sfter being removed

Last Modified

Feb 02, 2017

Products (1)

  • Cisco 7500 Series Routers

Known Affected Releases

12.0(23.4)S 12.2(12e) 12.2(13)T4 12.2(14.3)SPI 12.2(17)

Description (partial)

Symptoms: an entry in the FIB (as shown by 
show ip cef
) might not be removed as expected. Conditions: the symptoms may be observed on a Cisco router after the following configuration steps: 1) Cisco Express Forwarding is running. 2) Interface is in VRF V, with IP address A. 3) IP routing is disabled no ip routing 4) VRF V is unconfigured no ip vrf V 5) IP routing is re-enabled ip routing 6) Cisco Express Forwarding re-enabled ip cef 7) VRF V is re-configured. 8) Interface is re-configured in VRF V, with new IP address B. IP address A will still exist in the FIB. Workarounds: There is no workaround for the problem, however it can be avoided by not issuing no ip routing before unconfiguring a VRF.
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