Create a config file for ssh command

I have a ssh command as below:

ssh -o ProxyCommand="ssh ubuntu@ip_addr -W %h:%p" ubuntu@ip_addr2 -L port:ip_addr3:port

I want to create a config file for this command, but I don’t know what is the option of -L, here is my config file so far:

Host cassandra-khatkesh
  User ubuntu
  Hostname ip_addr2
  ProxyCommand ssh ubuntu@ip_addr -W %h:%p

Anyone knows how can I add -L to config file?

>Solution :

-L corresponds to the LocalForward keyword.

Host cassandra-khatkesh
  User ubuntu
  Hostname ip_addr2
  ProxyCommand ssh ubuntu@ip_addr -W %h:%p
  LocalForward port ip_addr3:port

Note that the local and remote endpoints are specified separately, not as single :-delimited string.