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Cisco Bug: CSCut18676 - Virtual reassembly count never times-out

Last Modified

Sep 16, 2018

Products (9)

  • Cisco IOS
  • Cisco 7206 Router
  • Cisco 7301 Router
  • Cisco 7206VXR Router
  • Cisco 7204 Router
  • Cisco 7202 Router
  • Cisco 7200 Series NPE-G2 Network Processing Engine
  • Cisco 7201 Router
  • Cisco 7204VXR Router

Known Affected Releases


Description (partial)

Virtual reassembly count reaches 16 and never times out on C2911

The error seen is as follows:

Oct 24 11:35:38.965 EDT: %IP_VFR-4-FRAG_TABLE_OVERFLOW: GigabitEthernet0/0: the fragment table has reached its maximum threshold 16

   Virtual Fragment Reassembly (VFR) is ENABLED [in]
   Concurrent reassemblies (max-reassemblies): 16
   Fragments per reassembly (max-fragments): 32
   Reassembly timeout (timeout): 3 seconds
   Drop fragments: OFF

   Current reassembly count:16
   Current fragment count:16
   Total reassembly count:1912
   Total reassembly timeout count:1

Max-reassemblies fills with 16, stays there and never frees up. When ISAKMP tries to renegotiate, it fails to reassemble the ISAKMP fragments and VPN tunnel goes down because the SA expires.
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