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Cisco Bug: CSCun07779 - IPSec malfunctions when crypto ACL contains overlapping/duplicate entry

Last Modified

Jul 21, 2020

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

9.1(4)

Description (partial) 

Symptom:
When duplicate entry exists in a Crypto ACL, ikev1 and ikev2 shows unusual behaviors.

1. Ikev2 - here ASA creates multiple child SAs for the same pair of source and destination.
2. Ikev1 - unable to pass traffic (no encaps and decaps can be seen), even if the sa is up and both of the sides are using correct pair of SPIs.

Conditions:
This behavior is seen when a crypto access-list with a duplicate entry is applied to a crypto-map entry.
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