Configuring IP Addressing
Loopback Interfaces
ProCurve(config)# interface loopback 1
ProCurve (lo1)# ip address 10.1.1.1
Figure 8-6. Example of a Loopback Interface Configuration
Notes â– You can configure a loopback interface only from the CLI; you cannot
configure a loopback interface from the web management or Menu inter-
face.
â– Loopback interfaces share the same IP address space with VLAN config-
urations. 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).
â– Each IP address that you configure on a loopback interface must be
unique in the switch. This means that the address cannot be used by a
VLAN interface or another loopback interface.
For 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. 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.
â– You can configure multiple IP addresses on a loopback interface (lo0 to
lo7). Up to thirty-two IP addresses are supported on a loopback interface.
The following example shows valid IP address configurations on two
loopback interfaces.
ProCurve(config)# interface loopback 0
ProCurve (lo0)# ip address 172.16.101.8
ProCurve (lo0)# ip address 172.16.101.9
ProCurve (lo0)# exit
ProCurve (config)# interface loopback 1
ProCurve (lo1)# ip address 172.16.102.1
ProCurve (lo1)# ip address 172.16.102.2
8-17
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