【案例分享】网络环路检测基本功能配置
发布作者：微思网络 发布时间：2022-07-04 浏览量：0次
三台设备Device A、Device B和Device C组成一个物理上的环形网络。 通过在Device A上配置环路检测功能，使系统能够自动关闭Device A上出现环路的端口，并通过打印日志信息来通知用户检查网络。 图1-3 环路检测基本功能配置组网图 (1)配置Device A (2)配置Device B (3)配置Device C 当配置完成后，系统在一个环路检测时间间隔内在Device A的端口GigabitEthernet1/0/1和GigabitEthernet1/0/2上都检测到了环路，于是将这两个端口自动关闭，并打印了如下日志信息： 使用display loopback-detection命令可以查看Device A上环路检测的配置和运行情况： 由此可见，Device A上并未显示在端口GigabitEthernet1/0/1和GigabitEthernet1/0/2上检测到环路，这是由于环路检测功能运行在Shutdown模式下，端口GigabitEthernet1/0/1和GigabitEthernet1/0/2上出现环路后均已被自动关闭，因此这两个端口上的环路已消除。此时，使用display interface命令分别查看Device A上端口GigabitEthernet1/0/1和GigabitEthernet1/0/2的状态信息： 由此可见，端口GigabitEthernet1/0/1和GigabitEthernet1/0/2均已被环路检测模块自动关闭。# 创建VLAN 100，并全局开启该VLAN内的环路检测功能。
<DeviceA> system-view
[DeviceA] vlan 100
[DeviceA–vlan100] quit
[DeviceA] loopback-detection global enable vlan 100
# 配置端口GigabitEthernet1/0/1和GigabitEthernet1/0/2为Trunk类型，并允许VLAN 100通过。
[DeviceA] interface gigabitethernet 1/0/1
[DeviceA-GigabitEthernet1/0/1] port link-type trunk
[DeviceA-GigabitEthernet1/0/1] port trunk permit vlan 100
[DeviceA-GigabitEthernet1/0/1] quit
[DeviceA] interface gigabitethernet 1/0/2
[DeviceA-GigabitEthernet1/0/2] port link-type trunk
[DeviceA-GigabitEthernet1/0/2] port trunk permit vlan 100
[DeviceA-GigabitEthernet1/0/2] quit
# 全局配置环路检测的处理模式为Shutdown模式。
[DeviceA] loopback-detection global action shutdown
# 配置环路检测的时间间隔为35秒。
[DeviceA] loopback-detection interval-time 3# 创建VLAN 100。
<DeviceB> system-view
[DeviceB] vlan 100
[DeviceB–vlan100] quit
# 配置端口GigabitEthernet1/0/1和GigabitEthernet1/0/2为Trunk类型，并允许VLAN 100通过。
[DeviceB] interface gigabitethernet 1/0/1
[DeviceB-GigabitEthernet1/0/1] port link-type trunk
[DeviceB-GigabitEthernet1/0/1] port trunk permit vlan 100
[DeviceB-GigabitEthernet1/0/1] quit
[DeviceB] interface gigabitethernet 1/0/2
[DeviceB-GigabitEthernet1/0/2] port link-type trunk
[DeviceB-GigabitEthernet1/0/2] port trunk permit vlan 100
[DeviceB-GigabitEthernet1/0/2] qui# 创建VLAN 100。
<DeviceC> system-view
[DeviceC] vlan 100
[DeviceC–vlan100] quit
# 配置端口GigabitEthernet1/0/1和GigabitEthernet1/0/2为Trunk类型，并允许VLAN 100通过。
[DeviceC] interface gigabitethernet 1/0/1
[DeviceC-GigabitEthernet1/0/1] port link-type trunk
[DeviceC-GigabitEthernet1/0/1] port trunk permit vlan 100
[DeviceC-GigabitEthernet1/0/1] quit
[DeviceC] interface gigabitethernet 1/0/2
[DeviceC-GigabitEthernet1/0/2] port link-type trunk
[DeviceC-GigabitEthernet1/0/2] port trunk permit vlan 100
[DeviceC-GigabitEthernet1/0/2] qui[DeviceA]
%Feb 24 15:04:29:663 2013 DeviceA LPDT/4/LPDT_LOOPED: Loopback exists on GigabitEthernet1/0/1.
%Feb 24 15:04:29:665 2013 DeviceA LPDT/4/LPDT_VLAN_LOOPED: Loopback exists on GigabitEthernet1/0/1 in VLAN 100.
%Feb 24 15:04:29:667 2013 DeviceA LPDT/4/LPDT_LOOPED: Loopback exists on GigabitEthernet1/0/2.
%Feb 24 15:04:29:669 2013 DeviceA LPDT/4/LPDT_VLAN_LOOPED: Loopback exists on GigabitEthernet1/0/2 in VLAN 100.
%Feb 24 15:04:44:240 2013 DeviceA LPDT/5/LPDT_RECOVERED: Loopback on GigabitEthernet1/0/1 in VLAN 100 recovered.
%Feb 24 15:04:44:243 2013 DeviceA LPDT/5/LPDT_RECOVERED: Loopback on GigabitEthernet1/0/1 recovered.
%Feb 24 15:04:44:245 2013 DeviceA LPDT/5/LPDT_RECOVERED: Loopback on GigabitEthernet1/0/2 in VLAN 100 recovered.
%Feb 24 15:04:44:248 2013 DeviceA LPDT/5/LPDT_RECOVERED: Loopback on GigabitEthernet1/0/2 recovered# 显示Device A上环路检测的配置和运行情况。
[DeviceA] display loopback-detection
Loopback detection is enabled.
Loopback detection interval is 35 second(s).
No loopback is detected.# 显示Device A上端口GigabitEthernet1/0/1的状态信息。
[DeviceA] display interface gigabitethernet 1/0/1
GigabitEthernet1/0/1 current state: DOWN (Loopback detection down)
...
# 显示Device A上端口GigabitEthernet1/0/2的状态信息。
[DeviceA] display interface gigabitethernet 1/0/2
GigabitEthernet1/0/2 current state: DOWN (Loopback detection down)
...
