Multi-level Dropdown in bootstrap 3.3.4

So i am trying to accomplish a multi-level dropdown as the title says. I am only getting one level and the second level is not appearing. I am not sure what I am missing. Here is what I have:

        <div class="collapse navbar-collapse" id="conference-dropdowns">
        <ul class="nav navbar-nav">
            <li class="dropdown">
                <a class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">AFC<span class="caret"></span></a>
                <ul class="dropdown-menu multi-level" role="menu">
                    <li class="dropdown-submenu">
                        <li><a href="/conference/1/division/1">AFC South</a></li>
                        <ul class="dropdown-menu">
                            <li><a href="/conference/1/division/1/team/1">Colts</a></li>
                        </ul>
                    </li>
                </ul>
            </li>
        </ul>
        <form class="navbar-form navbar-left" role="search">
            <div class="form-group">
                <input class="form-control" placeholder="Search" type="text">
            </div>
            <button type="submit" class="btn btn-default">Submit</button>
        </form>
        <ul class="nav navbar-nav navbar-right">
            <li><a href="#">Logout</a></li>
        </ul>
    </div>

I am on bootstrap 3.3.4 and just get AFC for Dropdown and inside only AFC South shows up. No submenu for it. any help would be great. thanks. I am also using bootswatch spacelab

Here is what I found to work in testing it, now I just need to write it out dynamically using JS.

<nav class="navbar navbar-default">
<div class="container-fluid">
    <div class="navbar-header">
        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
        </button>
        <a class="navbar-brand pull-left" href="#"><img id="logo" src="${pageContext.servletContext.contextPath}/static/images/aston.png"></a>
    </div>

    <div class="collapse navbar-collapse" id="conference-dropdowns">
        <ul class="nav navbar-nav">
            <li class="dropdown">
                <a class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">AFC<span class="caret"></span></a>
                <ul class="dropdown-menu multi-level" role="menu" aria-labelledby="dropdownMenu">
                    <li class="dropdown-submenu">
                        <a tabindex="-1" href="#">AFC South</a>
                        <ul class="dropdown-menu">
                            <li><a href="#">Colts</a></li>
                            <li><a href="#">Jaguars</a></li>
                            <li><a href="#">Titans</a></li>
                            <li><a href="#">Texans</a></li>
                        </ul>
                    </li>
                    <li class="dropdown-submenu">
                        <a tabindex="-1" href="#">AFC North</a>
                        <ul class="dropdown-menu">
                            <li><a href="#">Steelers</a></li>
                            <li><a href="#">Ravens</a></li>
                            <li><a href="#">Browns</a></li>
                            <li><a href="#">Bengals</a></li>
                        </ul>
                    </li>
                </ul>
            </li>
            <li class="dropdown">
                <a class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">NFC<span class="caret"></span></a>
                <ul class="dropdown-menu multi-level" role="menu" aria-labelledby="dropdownMenu">
                    <li class="dropdown-submenu">
                        <a tabindex="-1" href="#">NFC North</a>
                        <ul class="dropdown-menu">
                            <li><a href="#">Packers</a></li>
                            <li><a href="#">Vikings</a></li>
                            <li><a href="#">Lions</a></li>
                            <li><a href="#">Bears</a></li>
                        </ul>
                    </li>
                </ul>
            </li>
        </ul>
        <form class="navbar-form navbar-left" role="search">
            <div class="form-group">
                <input class="form-control" placeholder="Search" type="text">
            </div>
            <button type="submit" class="btn btn-default">Submit</button>
        </form>
        <ul class="nav navbar-nav navbar-right">
            <li><a href="#">Logout</a></li>
        </ul>
    </div>
</div>