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Configuring IP Addressing
Monitoring and Maintaining IP Addressing
IPC-47
Cisco IOS IP Configuration Guide
To specify a port other than the default port, use the following command in global configuration mode:
Monitoring and Maintaining IP Addressing
To monitor and maintain your network, perform the tasks described in the following sections. The tasks
in the first section are required; the tasks in the remaining sections are optional.
• Clearing Caches, Tables, and Databases (Required)
• Specifying the Format of Network Masks (Optional)
• Displaying System and Network Statistics (Optional)
• Monitoring and Maintaining NHRP (Optional)
Clearing Caches, Tables, and Databases
You can remove all contents of a particular cache, table, or database. Clearing a cache, table, or database
can become necessary when the contents of the particular structure have become or are suspected to be
invalid.
To clear caches, tables, and databases, use the following commands in EXEC mode, as needed:
Specifying the Format of Network Masks
IP uses a 32-bit mask, called a netmask, that indicates which address bits belong to the network and
subnetwork fields, and which bits belong to the host field. This is called a netmask. By default, show
commands display an IP address and then its netmask in dotted decimal notation. For example, a subnet
would be displayed as 131.108.11.55 255.255.255.0.
You might find it more convenient to display the network mask in hexadecimal format or bit count format
instead. The hexadecimal format is commonly used on UNIX systems. The previous example would be
displayed as 131.108.11.55 0XFFFFFF00.
The bit count format for displaying network masks is to append a slash (/) and the total number of bits
in the netmask to the address itself. The previous example would be displayed as 131.108.11.55/24.
Command Purpose
Router(config)# ip nat service skinny tcp port
number
Displays port number on which the CCM is listening for
skinny messages.
Command Purpose
Router# clear arp-cache
Clears the IP ARP cache and the fast-switching cache.
Router# clear host {name | *}
Removes one or all entries from the host name and address
cache.
Router# clear ip route {network [mask] | *}
Removes one or more routes from the IP routing table.