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Cisco Bug: CSCvv03229 - Crash in sre_dp_traverse_dfa_legacy as SIP invite messages crosses a GRE Tunnel

Last Modified

Sep 15, 2020

Products (1)

  • Cisco 4000 Series Integrated Services Routers

Known Affected Releases

16.9.4

Description (partial)

Symptom:
Device upgraded from  15.5(3)S7b to 16.9.4 to run the Umbrella feature

Conditions:
This issue only happens with below conditions,
1. Enable FW or NAT on the which will enable VFR (virtual fragement reassembly) on the interface
2. Enable NBAR or features (FNF/Performance monitor/ QoS match application)
3.Enable Umbrella on the box globally or on specific interface
4. The most necessary condition to trigger this issue is,
   There are 2 BRs on same site (auto-tunnel can redirect TC from one BR to another BR)
   The case is, only in this condition, the traffic from one BR to another BR will not run NBAR on LAN ingress for customer traffic and then NBAR do DPI on WAN egress side and then trigger the crash 
5. A big packet than interface MTU(1500) which needs to be done VFR before NBAR on WAN interface.
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