Cisco Bug: CSCuw42175 - Issues with GRE tunnels after SW upgrade from R14 to R17.3.2.
Dec 24, 2016
- Cisco ASR 5000 Series
Known Affected Releases
220.127.116.11474 17.6.M0.61865 18.5.M0.61916 19.2.M0.61848 19.2.M0.61896 19.2.M0.61909 19.2.d0 20.0.0 20.0.M0.61880 20.0.M0.61930 20.0.M0.61955 20.0.M0.61967 20.0.VC0.61975 20.0.v0
Requested by Escalation Team Symptom: VRF xxxx has 3 GRE tunnels, one remains UP and two went DOWN after software upgrade from R14 to R17.3.2. ******** show ip interface (vrf xxxxxxx) ******* Interface Name Address/Mask Port Status ============================== =================== ================== ====== T1 18.104.22.168/32 Tunnel UP T2 22.214.171.124/32 Tunnel DOWN T3 126.96.36.199/32 Tunnel DOWN Conditions: In network, for these vrfs xxxx T-2/T-3 , even though Kernel added that T-2/T-3 GRE interface, flows for these interfaces were not added to NPU. This in turn results in GRE Keepalives sent by other end of tunnel getting dropped on ASR box as NPU does not have a matching flow.
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