Fixing a backup or failover DHCP Server
First you have to create all scope options from your primary DHCP server to the backup/failover dhcp server.
If you try to run failover without setting up custom options then you will get Error 20010.
The specified option does not exist.
Replicate DHCP Scope options from the primary DHCP server to the backup.
https://ibmimedia.com/blog/215/dhcp-failover-failed-error-20010
dhcp failover add scopes on partner server failed the specified option does not exist
error 20013 dhcp failover
dhcp configure failover failed error 87 the parameter is incorrect
dhcp error code 20013 replication
dhcp failover conflict in types for the same option
dhcp failover 2012 r2 and 2016
the class name being used is unknown or incorrect
netsh #dhcp server
