KB.15.15

4 Routing Basics

For an overiew of IP routing, see “Overview of IP routing” (page 111).

Viewing the IP route table

The IP route table is displayed by entering the CLI command show ip route from any context

level in the console CLI. Here is an example of an entry in the IP route table:

Increasing ARP age timeout (CLI)

The address resolution protocol (ARP) age is the amount of time the switch keeps a MAC address

learned through ARP in the ARP cache. The switch resets the timer to zero each time the ARP entry

is refreshed and removes the entry if the timer reaches the ARP age.

Syntax:

[no] ip arp-age [[1...1440] | infinite ]

Allows the ARP age to be set from 1 to 1440 minutes (24 hours).

If the option infinite is configured, the internal ARP age timeout is set to

99,999,999 seconds (approximately 3.2 years). An arp-age value of 0 (zero)

is stored in the configuration file to indicate that infinite has been configured.

This value also displays with the show commands and in the menu display (Menu

Switch Configuration IP Config).

Default: 20 minutes

Viewing the IP route table 107