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Configuring a Loopback Interface

Configuring a Loopback Interface


The loopback interface is always Up to ensure network reliability.

The loopback interface has the following features:

  • The loopback interface is always Up and has the loopback feature.
  • The loopback interface can be configured with the mask of all 1s.

Based on the preceding features, the loopback interface has the following applications.

  • The IP address of a loopback interface is specified as the source address of packets to improve network reliability.
  • When no Router ID is configured for dynamic routing protocols, the maximum IP address of the loopback interface is configured as the router ID automatically.

The command set l3-interface loopback {lo | <vrf-name>} address <ip-address> prefix-length 32 can be used to configure a loopback interface.

The following command creates a loopback interface in the default VRF.

admin@Xorplus# set l3-interface loopback lo address 1.1.1.1 prefix-length 32
admin@Xorplus# commit


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