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【案例分享】网络环路检测基本功能配置
2022-07-06 17:21:00 【微思xmws】
配置需求
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。
组网图
图1-3 环路检测基本功能配置组网图
配置步骤
(1)配置Device A
# 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
(2)配置Device B
# 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
(3)配置Device C
# 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
验证配置
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:
[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
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:
# 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.
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:
# 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)
...
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。
end
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