The drush support for Migrate isn't in core itself, but you can easily install it by installing the Migrate Tools module. If you enable migrate_tools, you will get everything you need to use drush with your migrations:
$ drush en migrate_tools
The following extensions will be enabled: migrate_tools, migrate, migrate_plus
Do you really want to continue? (y/n): y
migrate was enabled successfully. [ok]
migrate_plus was enabled successfully. [ok]
migrate_tools was enabled successfully. [ok]
migrate_tools defines the following permissions: administer migrations
$ drush help | grep migrate
All commands in migrate_tools: (migrate_tools)
migrate-import (mi) Perform one or more migration processes.
migrate-manifest Execute the migrations as specified in a manifest file.
migrate-messages View any messages associated with a migration.
migrate-reset-status Reset a active migration's status to idle.
migrate-rollback Rollback one or more migrations.
migrate-status (ms) List all migrations with current status.
migrate-stop (mst) Stop an active migration operation.