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Configuring IP Addressing
Monitoring and Maintaining IP Addressing
IPC-48
Cisco IOS IP Configuration Guide
To specify the format in which netmasks appear for the current session, use the following command in
EXEC mode:
To configure the format in which netmasks appear for an individual line, use the following command in
line configuration mode:
Displaying System and Network Statistics
You can display specific statistics such as the contents of IP routing tables, caches, and databases. The
resulting information can be used to determine resource utilization and to solve network problems. You
also can display information about node reachability and discover the routing path that the packets of
your device are taking through the network.
These tasks are summarized in the table that follows. See the “IP Addressing Commands” chapter in the
Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services publication for details about
the commands listed in these tasks. Use the following commands in privileged EXEC mode to display
specific statistics, as needed:
Command Purpose
Router# term ip netmask-format {bitcount | decimal
| hexadecimal}
Specifies the format of network masks for the current session.
Command Purpose
Router(config-line)# ip netmask-format {bitcount |
decimal | hexadecimal}
Configures the format of network masks for a line.
Command Purpose
Router# show arp
Displays the entries in the ARP table.
Router# show hosts
Displays the default domain name, style of lookup service, the
name server hosts, and the cached list of host names and
addresses.
Router# show ip aliases
Displays IP addresses mapped to TCP ports (aliases).
Router# show ip arp
Displays the IP ARP cache.
Router# show ip interface [type number]
Displays the usability status of interfaces.
Router# show ip irdp
Displays IRDP values.
Router# show ip masks address
Displays the masks used for network addresses and the number
of subnets using each mask.
Router# show ip redirects
Displays the address of a default gateway.
Router# show ip route [address [mask]
[longer-prefixes]] | [protocol [process-id]]
Displays the current state of the routing table.
Router# show ip route summary
Displays the current state of the routing table in summary form.
Router# ping [protocol] {host | address}
Tests network node reachability (privileged mode).
Router# ping [protocol] {host | address}
Tests network node reachability using a simple ping facility
(user mode).