Cisco Bug: CSCuj77430 - ISM-VPN drops deny crypto acl traffic instead of passing it in clear
Nov 27, 2020
- Cisco 3900 Series Integrated Services Routers
Known Affected Releases
Symptom: When ISM-VPN module is Active, the deny ACL traffic gets blackholed, and dropped till the SAs come up for permit lines (which is a superset of deny ACEs). Once the tunnel is up, the traffic that is supposed to have passed through in clear-text [the deny ACEs] gets encrypted by ISM. Conditions: This symtom is observed in ISR-G2 with ISM-VPN module in Active State. - Crypto Map is configured, where the Crypto ACL has Deny entries at the top.
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Bug Details Include
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