The following example shows valid IP address configurations on two loopback interfaces. 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). 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. 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. To use ping to verify that TCP/IP is working correctly, run the command: ping 127.0.0.1. Loopback interfaces share the same IP address space with VLAN configurations. The basics By way of quick review, you can simply enter the following two commands to test basic network connectivity to a remote machine with a hostname of server01 or an IP address of 192.168.2.200: ping server01 ping 192.168.2.200 Figure 1: Results of ping to 8.8.8. This article provides steps to troubleshoot network connection issues by pinging the loopback address (127.0.0.1). 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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