Assign an IP Address to a Loopback Interface

IPv4 routing is enabled by default on SLX-OS devices that operate at Layer 3 and cannot be disabled. IP addresses must be assigned to interfaces on the devices to allow IPv4-based protocols to operate across the network.
  1. From privileged EXEC mode, access global configuration mode.
    device# configure terminal
    
  2. Access the interface to which you are assigning the IP addresses.
    device(config)# interface loopback 1
    
  3. Assign an IP address to the interface.
    Note

    Note

    You can define only one IP address per loopback. The only valid mask value is /32.
    device(config-Loopback-1)# ip address 1.1.1.1/32
    
  4. Activate the interface.
    device(config-Loopback-1)# no shutdown
  5. Verify that the IP address is assigned to the interface.
    device(config-Loopback-1)# do show ip interface loopback 1
     Loopback 1 is up protocol is up
     Primary Internet Address is 1.1.1.1/32
     IP MTU is 1500
     Proxy Arp is not Enabled
     ICMP unreachables are always sent
     ICMP mask replies are never sent
     IP fast switching is enabled
     Vrf : default-vrf