Obstacle avoidance in move_base package

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I am using DWAPlannerRos and GlobalPlanner for move_base navigation package. It is able to navigate to goal. I have set the inflation radius of obstacle layer and inflation layer of costmap to be 1.0. I suppose when the robot footprint enter the obstacle region, the navigation stack should stop the robot to prevent collision but it didn't happen. Whyy?

Image above shows my local costmap (/move_base/local_costmap/costmap). Green color polygon is the robot footprint. I define the robot footprint larger than the robot's model for testing and visualizing purpose.

my movebase launch file:

<launch>
  <node pkg="move_base" type="move_base" respawn="false" name="move_base" output="screen">
    <param name="base_global_planner" value="global_planner/GlobalPlanner"/>
    <param name="base_local_planner" value="dwa_local_planner/DWAPlannerROS"/>
    <param name="controller_frequency" value="10"/>
    <rosparam file="$(find erobot)/config/common_costmap_params.yaml" command="load" ns="local_costmap"/>
    <rosparam file="$(find erobot)/config/common_costmap_params.yaml" command="load" ns="global_costmap"/>
    <rosparam file="$(find erobot)/config/local_costmap_params.yaml" command="load" />
    <rosparam file="$(find erobot)/config/global_costmap_params.yaml" command="load" />
    <rosparam file="$(find erobot)/config/custom_planner_params.yaml" command="load" />
    <remap from="cmd_vel" to="erobot_controller/cmd_vel"/>
    <remap from="odom" to="erobot_controller/odom"/>
  </node>

</launch>

common costmap yaml:

#footprint: [[0.275, 0.375], [-0.275, 0.375], [-0.275, -0.375], [0.275, -0.375]]
footprint: [[0.5, 0.5], [-0.5, 0.5], [-0.5, -0.5], [0.5, -0.5]]
robot_radius: 0.5

transform_tolerance: 0.4

obstacle_layer:
  enabled: true
  obstacle_range: 2.5
  raytrace_range: 3.0
  max_obstacle_height: 2.0
  min_obstacle_height: -2.0
  inflation_radius: 1.00
  observation_sources: laser_scan_sensor
  laser_scan_sensor: {sensor_frame: front_laser_frame, data_type: LaserScan, topic: front_scan, marking: true, clearing: true}

inflation_layer:
  enabled:              true
  cost_scaling_factor:  5.0  # exponential rate at which the obstacle cost drops off (default: 10)
  inflation_radius:     1.0  # max. distance from an obstacle at which costs are incurred for planning paths.

global costmap yaml:

global_costmap:
  global_frame: /map
  robot_base_frame: base_footprint
  update_frequency: 3.0
  static_map: true
  transform_tolerance: 5.0
  plugins:
     - {name: static_layer,            type: "costmap_2d::StaticLayer"}
     - {name: obstacle_layer,          type: "costmap_2d::VoxelLayer"}
     - {name: inflation_layer,         type: "costmap_2d::InflationLayer"}

local costmap yaml:

local_costmap:
  global_frame: /odom
  robot_base_frame: base_footprint
  update_frequency: 3.0
  publish_frequency: 2.0
  static_map: false
  rolling_window: true
  width: 6.0
  height: 6.0
  resolution: 0.05
  transform_tolerance: 5.0
  plugins:
    - {name: obstacle_layer,      type: "costmap_2d::VoxelLayer"}
    - {name: inflation_layer,     type: "costmap_2d::InflationLayer"}