Displaying IP Configuration Information

You can use various show commands to view the IP configuration on a device.

In this task, commands and options are shown to allow you to view the following IP configuration information statistics on Layer 3 devices:

  • Global IP parameter settings and IP access policies
  • IP interfaces
  • IP forwarding cache
  • IP route table
  1. Enter global configuration mode. 
    device# configure terminal
  2. (Optional) To enable CIDR format for displaying network masks, entering the following command. 
    device(config)# ip show-subnet-length
    By default, the CLI displays network masks in classical IP address format (example: 255.255.255.0). This command displays the network mask in CIDR format with a /prefix (for example /24).
  3. Use the show ip command to display general IP configuration information. 
    device# show ip

Global Settings
  ttl: 64, arp-age: 10, bootp-relay-max-hops: 4
  router-id : 10.95.11.128
 enabled : UDP-Broadcast-Forwarding  Source-Route  Load-Sharing  RARP  OSPF  VRRP-Extended  VSRP 
 disabled: Route-Only  Directed-Broadcast-Forwarding  BGP4 IRDP  Proxy-ARP  RIP  VRRP  ICMP-Redirect
Static Routes
  Index   IP Address        Subnet Mask       Next Hop Router   Metric Distance
  1       0.0.0.0           0.0.0.0 										10.157.23.2       1      1
Policies
  Index   Action   Source           Destination      Protocol   Port  Operator
  1       deny 				10.157.22.34 	 		10.157.22.26     tcp        http  =
  64      permit   any              any
    The display shows the local IP address, ARP aging timer, protocols that are enabled, static route information including the next hop address, any policies that are configured to filter the traffic, and other configurable options.
  4. Use the show ip interface command to display IP interface information. 
    device# show ip interface
 
Interface         IP-Address      OK?  Method    Status            Protocol
Ethernet 1/1/1    10.95.6.173     YES  NVRAM     up                up
Ethernet 1/1/2    10.3.3.3        YES  manual    up                up
Loopback 1        10.2.3.4        YES  NVRAM     down              down
    The example shows IP addresses configured for specific interfaces and the status of the interface.
  5. Use the show ip interface command with specific options to display detailed IP information for a specific interface. 
    device# show ip interface ve 1

Interface Ve 1
members: ethe 1/1/4 to 1/1/24 ethe 1/1/27 to 1/1/48 ethe 1/2/1 to 1/2/2 ethe 2/1/1 to 2/1/2 
ethe 2/1/4 to 2/1/12 ethe 2/1/15 to 2/1/24 ethe 2/2/1 to 2/2/2 ethe 3/1/1 to 3/1/2 ethe 3/1/4 to 3/1/12
ethe 3/1/14 to 3/1/24 ethe 3/2/3 to 3/2/4 ethe 4/1/1 to 4/1/12 ethe 4/1/15 to 4/1/24 ethe 4/2/3 to 4/2/4 
ethe 5/1/1 to 5/1/12 ethe 5/1/14 to 5/1/24 ethe 5/2/3 
active: ethe 4/2/4 
port enabled
port state: UP
ip address: 10.66.66.66       subnet mask: 255.255.255.0     
Port belongs to VRF: default-vrf
encapsulation: ETHERNET, mtu: 9216, metric: 1
directed-broadcast-forwarding: disabled
ICMP redirect: enabled
proxy-arp: disabled
ip arp-age:  10 minutes
No Helper Addresses are configured.
No inbound ip access-list is set
No outgoing ip access-list is set
    The example shows more detailed information about virtual interface 1 and its configured, or default, options.
  6. Use the show ip route command to display the IP route table. 
    device# show ip route

Total number of IP routes: 514
Start index: 1  B:BGP D:Connected  R:RIP  S:Static  O:OSPF *:Candidate default
Destination       NetMask           Gateway         Port   Cost   Type
10.1.0.0           255.255.0.0      10.1.1.2        1/1/1    2      R
10.2.0.0           255.255.0.0      10.1.1.2        1/1/1    2      R
10.3.0.0           255.255.0.0      10.1.1.2        1/1/1    2      R
10.4.0.0           255.255.0.0      10.1.1.2        1/1/1    2      R
10.5.0.0           255.255.0.0      10.1.1.2        1/1/1    2      R
10.6.0.0           255.255.0.0      10.1.1.2        1/1/1    2      R
10.7.0.0           255.255.0.0      10.1.1.2        1/1/1    2      R
10.8.0.0           255.255.0.0      10.1.1.2        1/1/1    2      R
10.9.0.0           255.255.0.0      10.1.1.2        1/1/1    2      R
10.10.0.0          255.255.0.0      10.1.1.2        1/1/1    2      S
  7. Use the direct option of the show ip route command to display only direct routes that go to devices directly attached to the Layer 3 device. 
    device# show ip route direct

Start index: 1  B:BGP D:Connected  R:RIP  S:Static  O:OSPF *:Candidate default
   Destination       NetMask           Gateway         Port   Cost   Type
   10.157.22.0       255.255.255.0     0.0.0.0         1/4/11   1      D
    Notice that the route displayed in this example has "D" in the Type field, indicating the route is to a directly connected device.
  8. Use the static option of the show ip route command to display configured static IP routes. 
    device# show ip route static

Start index: 1  B:BGP D:Connected  R:RIP  S:Static  O:OSPF *:Candidate default
   Destination       NetMask           Gateway        Port   Cost   Type
   10.144.33.11     255.255.255.0      10.157.22.12   1/1/1    2      S
    Notice that the route displayed in this example has "S" in the Type field, indicating the route is static.
  9. Use the show ip cache command to display the IP forwarding cache. 
    device# show ip cache

Total number of cache entries: 3
D:Dynamic  P:Permanent  F:Forward  U:Us  C:Complex Filter
W:Wait ARP  I:ICMP Deny  K:Drop  R:Fragment  S:Snap Encap
      IP Address       Next Hop         MAC              Type  Port  Vlan  Pri
1     192.168.1.11     DIRECT           0000.0000.0000   PU    n/a         0
2     192.168.1.255    DIRECT           0000.0000.0000   PU    n/a         0
3     255.255.255.255  DIRECT           0000.0000.0000   PU    n/a         0
Parent topic: IP Addressing