Stopping log transfer from primary to standby

Hi All,

We have decommissioned standby. But log transfer is still not stopped. We are getting errors in alert log in primary system as below attachment.

I have thought of changing parameter LOG_ARCHIVE_DEST_3 parameter in primary in pfile and create spfile. Restart the db.

or any other way to do it?? LOG_ARCHIVE_DEST_3 parameter is in spfile is like value SERVICE=ISCS lgwr async reopen=60 verify.

Please guide me the solution.

Regards,

Vishnu