Cisco Bug: CSCuk55193 - Router crashes in tdp_rx_notify after disabling tag switching
Jan 31, 2017
- Cisco IOS
Known Affected Releases
Symptoms: On a router that runs Cisco IOS Release 12.2S and that is configured for Multiprotocol Label Switching (MPLS) Label Distribution Protocol (LDP), a configuration change that causes one or more LDP sessions to be terminated may cause the router to reload in a manner similar to the following: %ALIGN-1-FATAL: Illegal access to a low address addr=0x64, pc=0x41285C40, ra=0x41285C30, sp=0x44B1C378 %ALIGN-1-FATAL: Illegal access to a low address addr=0x64, pc=0x41285C40, ra=0x41285C30, sp=0x44B1C378 TLB (store) exception, CPU signal 10, PC = 0x41285C40 The symptom may occur with either LDP or Tag Distribution Protocol (TDP). Conditions: This symptom is extremely unlikely to occur and requires a very unlikely timing of events between LDP and TCP. The symptom may occur in the following releases and their rebuilds: Release 12.2(18)S, 12.2(20)S, 12.2(22)S, and 12.2(25)S. There are many configuration commands that may trigger the symptom, including entering the <CmdBold>no ip vrf<noCmdBold> command to remove a VRF that has LDP-enabled interfaces, entering the <CmdBold>no mpls ldp router-id<noCmdBold> command to trigger a change to the LDP router ID, or entering the <CmdBold>no mpls ip<noCmdBold> interface configuration command to disable LDP on an interface.
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