![]() #LOOPBACK ADDRESS SOFTWARE#The following example shows valid IP address configurations on two loopback interfaces. A loopback interface is a special virtual interface created in software that is not associated with any hardware interface. Up to thirty-two IP addresses are supported on a loopback interface. You can configure multiple IP addresses on a loopback interface ( lo0 to lo7). The standard domain name for the address is localhost. The most commonly used IP address on the loopback network is 127.0. In the same way, if you configure a loopback interface ( lo1) with IP address 172.16.101.8, you cannot configure another loopback interface ( lo2) with IP address 172.16.101.8. Various Internet Engineering Task Force (IETF) standards reserve the IPv4 address block 127.0.0.0/8, in CIDR notation and the IPv6 address ::1/128 for this purpose. Any traffic that a computer program sends on the loopback network is addressed to the same computer. This means that the address cannot be used by a VLAN interface or another loopback interface.įor example, if you configure a VLAN with IP address 172.16.100.8/24, you cannot configure a loopback interface with IP address 172.16.100.8. The maximum number of IP addresses supported on a switch is 2048, which includes all IP addresses configured for both VLANs and loopback interfaces (except for the default loopback IP address 127.0.0.1).Įach IP address that you configure on a loopback interface must be unique in the switch. Loopback interfaces share the same IP address space with VLAN configurations. You can configure a loopback interface only from the CLI you cannot configure a loopback interface from the WebAgent or Menu interface. ![]()
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