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9.3 Port Loopback Detection Function Example
As shown in the above configuration, the Chassis Switch will detect the existence of loopbacks in the network
topology. After enabling the function of loopback detection on the port connecting the Chassis Switch with the
outside net work, the Chassis Switch will notify the connected network about the existence of a loopback, and
control the port on the switch to guarantee the normal operation of the whole net work.
The configuration task sequence of SWITCH:
XGS 3-42000R(config)#loopback-detection interval-time 35 15
XGS 3-42000R(config)#interface ethernet 1/1
XGS 3-42000R(config-If-Ethernet1/1)#loopback-detection special-vlan 1-3
XGS 3-42000R(config-If-Ethernet1/1)#loopback-detection control block
If adopting the control method of block, MS TP should be globally enabled. And the correspondence bet ween
the spanning tree instance and the VLA N should be configured.
XGS 3-42000R(config)#spanning-tree
XGS 3-42000R(config)#spanning-tree mst configuration
XGS 3-42000R(config-Mstp-Region)#instance 1 vlan 1
XGS 3-42000R(config-Mstp-Region)#instance 2 vlan 2
XGS 3-42000R(config-Mstp-Region)#
9.4 Port Loopback Detection Troubleshooting
The function of port loopback detection is disabled by default and should only be enabled if required.
Chapter 10 ULDP Function Configuration
Network Topology
Figure 9-3-1 A typical example of port loopback detection
SWITCH
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Troubleshooting
