What is a loopback interface In what situation will you use one How do u configure one on a cisco router Comment. 6 Comments 4 Solutions 8847 Views Last Modified. Up to thirty-two IP addresses are supported on a loopback interface. What is a loopback interface Albert1809 asked on.
WHAT IS LOOPBACK INTERFACE SERIAL
To see loopback information for non-ATM interfaces, please click here and scroll down to the section on Special Serial Line Tests.
Figure 1 and Example 1 illustrate how that process. You can configure multiple IP addresses on a loopback interface ( lo0 to lo7). The loopback diagnostic command under an ATM interface of a Cisco router causes traffic going out of the interface to come back to the router.
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. The first three interfaces are the most interesting. Usage of loopback addresses are particularly popular with developers and anyone in IT performing network tests. 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. Interface number 4 is the standard local loopback interface at 127.0.0.1 and can usually be ignored. A loopback is an address that causes the traffic to be sent to the same interface is was sent out on on the localhost. The loopback interface has no hardware associated with it, and it is not physically connected to a network.
WHAT IS LOOPBACK INTERFACE SOFTWARE
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 address is a special IP number (127.0.0.1) that is designated for the software loopback interface of a machine. 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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