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Cisco Bug: CSCvs95052 - L2L IKEv2 IPSEC with integrity esp-sha512 - replies to SNMP queries to ASA inside over VPN not sent

Last Modified

Apr 20, 2020

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

9.12(3.2) 9.8(3.21)

Description (partial)

Symptom:
SNMP queries over VPN to ASA inside IP freeze.
E.g.

SNMPpoller---(inside)ASA1(public)---INET---(outside)ASA2(inside)

First few queries of:
 snmpwalk -On -v 2c -c <community> <ASA2 inside IP> are passing fine, and then SNMP times out.

snmpwalk -On -v 2c -c <community> <ASA2 inside IP>
.1.3.6.1.2.1.1.1.0 = STRING: "Cisco Adaptive Security Appliance Version 9.8(2)20"
.1.3.6.1.2.1.1.2.0 = OID: .1.3.6.1.4.1.9.1.2114
.1.3.6.1.2.1.1.3.0 = Timeticks: (211300) 0:35:13.00
Timeout: No Response from <ASA2 inside IP>

show crypto ipsec sa on ASA2 shows "#send errors:" counter increasing.

Dropped packets are not seen in "show asp drop" counters / captures.

Conditions:
L2L IKEv2
Integrity algorithm esp-sha512 used for IPSEC SA.
ASA queried with SNMP to inside interface from remote host over VPN.
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