This INTEGER (none, ipv4, distinguishedName, fqdn) is described as the type for remote-identity slot 4, which per its description must be set together with the corresponding csOrionIKECryptoMapRemoteIdentity4 value. An admin sets this so IKE knows how to parse and compare the paired remote-identity string, whether as a bare IPv4 address/subnet, a certificate distinguished name, or a domain name. For example, an admin identifying remote peer 4 by its certificate subject rather than its IP would set this to 'distinguishedName' to match a corresponding DN string configured in remote-identity slot 4.