Displaying loopback interface configurations
Do one of the following:
Use the
show ip
command to display a list of the loopback interfaces, which are sorted according to the loopback number.The list of loopback interfaces is displayed below other IP configuration parameters, such as packet TTL and ARP age-out values, and VLAN IP configurations. The default loopback interface (
Use the
show ip route
command to display the loopback interfaces in a list of IP routing entries. The list is sorted according to the destination IP address.
The following example displays the IP addresses configured for two user-defined loopback interfaces(lo1 and lo2).
switch# show ip
IP Routing : Enabled
Default Gateway : 15.255.128.1
Default TTL : 64
Arp Age : 20
Domain Suffix :
DNS server :
| Proxy ARP
VLAN | IP Config IP Address Subnet Mask Std Local
---------------- + ---------- --------------- -------------- ----------
DEFAULT_VLAN | Manual 10.0.8.121 255.255.0.0 No No
VLAN2 Manual 192.168.12.1 255.255.255.0 No No
VLAN3 Disabled
Loopback Addresses
Loopback IP Config IP Address Subnet Mask
-------- ---------- ------------------ ---------------
lol Manual 172.16.110.2 255.255.255.255
lo2 Manual 172.16.112.2 255.255.255.255
lo2 Manual 172.16.114.1 255.255.255.255
The following example displays the configuration of the default loopback interface (lo0) and one user-defined loopback interface (lo2).
switch# show ip route
IP Route Entries
Destination Gateway VLAN Type Sub-Type Metric Dist.
------------------ --------------- ---- --------- ---------- --------- ----
10.0.0.0/16 DEFAULT_VLAN 1 connected 1 0
127.0.0.0/8 reject static 0 0
127.0.0.1/32 lo0 connected 1 0
172.16.10.121/32 lo2 static 1 0
172.16.100.0/24 10.0.8.11 1 ospf IntraArea 1 1
172.16.102.0/24 VLAN2 2 connected 1 0