Cisco IKEv1 Site-to-Site IPSec Configuration on IOS Routers (2) – Using Two Different CA Certificate.
Pre-sharedkeysanddigitalcertificatesaretwoprimaryauthenticationmethodsinIKEthatcanbeusedinthecontextofIPSecVPNdeployments.Digitalcertificatesprovideameanstodigitallyauthenticatedevicesandindividualuse