-primary btn-success mb-2" onclick="javascript:save_topology();">Save External Topology</button>
            <div class="row">
              <div class="col-lg-12 col-xs-12">
                <div class="table-responsive">
                  <table id="external_table" class="table table-hover table-bordered"
                  data-unique-id="index"
                  data-toggle="table"
                  data-search="true"
                  data-sortable="true"
                  data-pagination="true"
        