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Cisco Bug: CSCun36655 - GETVPN+LISP IPsec MTU error

Last Modified

Apr 17, 2019

Products (1)

  • Cisco IOS

Known Affected Releases

15.3(3)XB12

Description (partial)

Symptom: If the terminal adjacency of a lisp interface is removed and then re-added, the lisp interface MTU may remain at the invalid value of 65535.  This can be seen in the "show cef interface <intf> internal" command output.

IPsec will obtain the MTU value from CEF and LISP, and the incorrect MTU will cause drops of large packets.

IPSEC MTU incorrectly computed - causing packet drops on large packets  traversing from "inside" to "outside" are dropped.
Conditions: This symptom is observed in the following Cisco C800 Series:
Cisco IOS Software, C890 Software (C890-UNIVERSALK9-M), Version 15.3(3)XB12, RELEASE SOFTWARE (fc2)
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