Section: Troubleshooting using ASDM and CLI

https://www.cisco.com/c/en/us/support/docs/security-vpn/public-key-infrastructure-pki/200339-Configure-ASA-SSL-Digital-Certificate-I.html

HSRP (Hot Standby Router Protocol). HSRP is a Cisco proprietary protocol that provides stateful failover for IPsec virtual private networks (VPNs). It is used to create a virtual router in order to provide redundancy in the event of an IPsec VPN failure. HSRP works by assigning a single primary router to manage the connection and forwarding traffic to the secondary router if the primary router fails.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_conn_vpnav/configuration/15-mt/sec-vpn-availability-15-mt-book/sec-state-fail-ipsec.html

The following table lists the commands that are enabled with the IKEv2 Smart Defaults feature, along with the default values.
...
Device# show crypto ipsec profile default
IPSEC profile default
Security association lifetime: 4608000 kilobytes/3600 seconds
Responder-Only (Y/N): N
PFS (Y/N): N
Transform sets={
default: { esp-aes esp-sha-hmac },
}
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_conn_ike2vpn/configuration/xe-3s/sec-flex-vpn-xe-3s-book/sec-cfg-ikev2-flex.html

Reference:
https://www.cisco.com/c/en/us/support/docs/security/flexvpn/200555-FlexVPN-AnyConnect-IKEv2- Remote-Access.html