12-环路检测典型配置举例
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目 录
本章介绍了使用环路检测功能来及时发现二层网络环路的典型配置案例。
由于TRILL网络本身可以避免产生环路,因此不必也不建议在TRILL端口上使能环路检测功能。有关TRILL的详细介绍,请参见“TRILL配置指导”中的“TRILL”。
表1 配置适用的产品与软件版本关系
产品 |
软件版本 |
S5830V2&S5820V2系列以太网交换机 |
Release 2208P01,Release 2210 |
如图1所示: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。
# 创建VLAN 100,并全局使能该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Ten-GigabitEthernet1/0/1和Ten-GigabitEthernet1/0/2为Trunk类型,并允许VLAN 100通过。
[DeviceA] interface ten-gigabitethernet 1/0/1
[DeviceA-Ten-GigabitEthernet1/0/1] port link-type trunk
[DeviceA-Ten-GigabitEthernet1/0/1] port trunk permit vlan 100
[DeviceA-Ten-GigabitEthernet1/0/1] quit
[DeviceA] interface ten-gigabitethernet 1/0/2
[DeviceA-Ten-GigabitEthernet1/0/2] port link-type trunk
[DeviceA-Ten-GigabitEthernet1/0/2] port trunk permit vlan 100
[DeviceA-Ten-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 35
# 创建VLAN 100。
<DeviceB> system-view
[DeviceB] vlan 100
[DeviceB–vlan100] quit
# 配置端口Ten-GigabitEthernet1/0/1和Ten-GigabitEthernet1/0/2为Trunk类型,并允许VLAN 100通过。
[DeviceB] interface ten-gigabitethernet 1/0/1
[DeviceB-Ten-GigabitEthernet1/0/1] port link-type trunk
[DeviceB-Ten-GigabitEthernet1/0/1] port trunk permit vlan 100
[DeviceB-Ten-GigabitEthernet1/0/1] quit
[DeviceB] interface ten-gigabitethernet 1/0/2
[DeviceB-Ten-GigabitEthernet1/0/2] port link-type trunk
[DeviceB-Ten-GigabitEthernet1/0/2] port trunk permit vlan 100
[DeviceB-Ten-GigabitEthernet1/0/2] quit
# 创建VLAN 100。
<DeviceC> system-view
[DeviceC] vlan 100
[DeviceC–vlan100] quit
# 配置端口Ten-GigabitEthernet1/0/1和Ten-GigabitEthernet1/0/2为Trunk类型,并允许VLAN 100通过。
[DeviceC] interface ten-gigabitethernet 1/0/1
[DeviceC-Ten-GigabitEthernet1/0/1] port link-type trunk
[DeviceC-Ten-GigabitEthernet1/0/1] port trunk permit vlan 100
[DeviceC-Ten-GigabitEthernet1/0/1] quit
[DeviceC] interface ten-gigabitethernet 1/0/2
[DeviceC-Ten-GigabitEthernet1/0/2] port link-type trunk
[DeviceC-Ten-GigabitEthernet1/0/2] port trunk permit vlan 100
[DeviceC-Ten-GigabitEthernet1/0/2] quit
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Ten-GigabitEthernet1/0/1和Ten-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 Ten-GigabitEthernet1/0/1.
%Feb 24 15:04:29:667 2013 DeviceA LPDT/4/LPDT_LOOPED: Loopback exists on Ten-GigabitEthernet1/0/2.
%Feb 24 15:04:44:243 2013 DeviceA LPDT/5/LPDT_RECOVERED: Loopback on Ten-GigabitEthernet1/0/1 recovered.
%Feb 24 15:04:44:248 2013 DeviceA LPDT/5/LPDT_RECOVERED: Loopback on Ten-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Ten-GigabitEthernet1/0/1和Ten-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Ten-GigabitEthernet1/0/1和Ten-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Ten-GigabitEthernet1/0/1和Ten-GigabitEthernet1/0/2的状态信息:
# 显示Device A上端口Ten-GigabitEthernet1/0/1的状态信息。
[DeviceA] display interface ten-gigabitethernet 1/0/1
Ten-GigabitEthernet1/0/1 current state: DOWN (Loopback detection down)
...
# 显示Device A上端口Ten-GigabitEthernet1/0/2的状态信息。
[DeviceA] display interface ten-gigabitethernet 1/0/2
Ten-GigabitEthernet1/0/2 current state: DOWN (Loopback detection down)
...
由此可见,端口Ten-GigabitEthernet1/0/1和Ten-GigabitEthernet1/0/2均已被环路检测模块自动关闭。被关闭的端口只能通过undo shutdown命令将其手工开启。
· DeviceA
#
vlan 100
#
loopback-detection global enable vlan 100
loopback-detection global action shutdown
loopback-detection interval-time 35
#
interface Ten-GigabitEthernet1/0/1
port link-type trunk
port trunk permit vlan 1 100
#
interface Ten-GigabitEthernet1/0/2
port link-type trunk
port trunk permit vlan 1 100
#
· DeviceB
#
vlan 100
#
interface Ten-GigabitEthernet1/0/1
port link-type trunk
port trunk permit vlan 1 100
#
interface Ten-GigabitEthernet1/0/2
port link-type trunk
port trunk permit vlan 1 100
#
· DeviceC
DeviceC上的配置文件与DeviceB相同。
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