SNR S2940-8G-v2 Switch Configuration Guide
Port Loopback Detection Function Configuration
5. Configure the loopback-detection control mode (automatic recovery enabled or not)
Command Explanation
Global Mode
loopback-detection control-
recovery timeout <0-3600>
Configure the loopback-detection control mode (automatic
recovery enabled or not) or recovery time.
5.3 Port Loopback Detection Function Example
Figure 5.1: Typical example of port loopback detection function
As shown in the above configuration, the switch will detect the existence of loopbacks in the
network topology. After enabling the function of loopback detection on the port connecting the
switch with the outside network, the 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
network.
The configuration task sequence of SWITCH:
Switch(config)#loopback-detection interval-time 35 15
Switch(config)#interface ethernet 1/1
Switch(Config-If-Ethernet1/1)#loopback-detection special-vlan 1-3
Switch(Config-If-Ethernet1/1)#loopback-detection control block
If adopting the control method of block, MSTP should be globally enabled. And the correspond-
ing relation between the spanning tree instance and the VLAN should be configured.
Switch(config)#spanning-tree
Switch(config)#spanning-tree mst configuration
Switch(Config-Mstp-Region)#instance 1 vlan 1
Switch(Config-Mstp-Region)#instance 2 vlan 2
Switch(Config-Mstp-Region)#
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