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Cisco Bug: CSCuw33328 - IOS-XE: ZBF + dVTI + Default Zone, IOS doesn't do VFR

Last Modified

Sep 25, 2018

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.5(3)S

Description (partial)

Symptom:
VFR is not enabled in default zone with dynamic tunnel and ZBF (e.g. DMVPN).

A symptom of the above is packets that need reassembly due to fragmentation to get dropped with an error similar to the one below:
Dropping udp pkt from internal0/0/rp:0 10.1.1.1:161 => 192.168.0.1:41706(target:class)-(none:none) 
due to Invalid L4 header with ip ident 11197

SPOKE#show policy-firewall stats platform
...
--show platform hardware qfp active feature firewall drop--
-------------------------------------------------------------------------------
Drop Reason                                                             Packets
-------------------------------------------------------------------------------
Invalid L4 header                                                          1241	<---

Conditions:
Default zone is enabled
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