+
+clib_error_t *
+l2tp_sw_interface_up_down (vnet_main_t * vnm,
+ u32 sw_if_index,
+ u32 flags)
+{
+ l2t_main_t *lm = &l2t_main;
+ vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
+ if (hi->hw_class_index != l2tpv3_hw_class.index)
+ return 0;
+
+ u32 session_index = hi->dev_instance;
+ l2t_session_t *s = pool_elt_at_index (lm->sessions, session_index);
+ s->admin_up = !! (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP);
+ return 0;
+}
+
+VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION (l2tp_sw_interface_up_down);
+