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Cisco Bug: CSCun79150 - VPN-ISM inbound decrypted packets dropped with TP and fvrf configured

Last Modified

Nov 27, 2020

Products (2)

  • Cisco 2600 Series Multiservice Platforms
  • Cisco 2600 Series Multiservice Platforms

Known Affected Releases

15.3(3)M 15.4(1)T1

Description (partial)

After upgrading the router (2951) from 153-2.T1 to 154-1.T 

Packet drop through a GRE over ipsec tunnel .  No errors are reported with respect to the crypto engine part.  the packets are dropped in the inbound direction after the decryption process  . The router routes the packets in the wrong vrf and not the correct front door vrf .

ISM-VPN module is enabled  and the ipsec security associations are  using it .
A front door vrf is configured and it is used to tunnel the gre encapsulated packets .
This has nothing to do with the packet size .
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