Timeouts while using LDAP and TNSNAMES for names resolving

I use an OID for Oracle Names resolving at the client-side.
I tested some errorcases because there are no HA-features implemented for the OID.
So i have an LDAP.ORA with the adress and the ports of the OID.
My SQLNET.ORA has this content:
NAMES.DEFAULT_DOMAIN = <my_company_domian>
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (LDAP, TNSNAMES)So actually there is no problem. But when i turn off the OID-Server there iss a timeout of about 20 second to resolve the name.
So my problem is not the resolving. I only want to know if there is a possibility to minimize the timeout to switch between LDAP-name-resolving to tnsnames.ora-name-resolving?

thanks Oviwan but i think this problem couldn't be solved with a parameter.
@rgoogld:
I already feared that i have to live with that timeout.
But your options are interesting. In the future i will have 2 OIDs and in the first time the TNSNAMES.ORA-names-resolving as backup.
I already can test this because i have a productive OID and one for test-purposes. So at the moment i have two OIDs listet in my LDAP.ORA.
example:
DIRECTORY_SERVERS = (<server_name_oid1>:<Port1>:<Port2>, <server_name_oid2>:<Port1>:<Port2>)
DEFAULT_ADMIN_CONTEXT = ""
DIRECTORY_SERVER_TYPE = OIDThere is already a (about 20 seconds) timeout, when the OID1 is powered down or the services are stopped. The client honestly ask the second OID after the "timeout" and resolve the name.
2 OIDs+TNSNAMS or 1 OID+TNSNAMES in both cases your options could perhaps prevent the timeout. I'm not really a system administrator, but i can discuss it with my colleagues here.
Do you know a smart way to remove or repoint an DNS-entry in a windows enviroment. For such actions i have also to monitor the status of the OID-services or the servers and make the dns-changes if something is crashed.
At this moment i have no idea how to do this but perhaps you or someone else here have some tips for me.

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