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Configuring IP Unicast Routing
Configuring IP Addressing
Figure 99 No IP Classless Routing
To prevent the switch from forwarding packets destined for unrecognized subnets to the best supernet route possible,
you can disable classless routing behavior.
BEFORE YOU BEGIN
Review the Information About IP Routing, page 797.
DETAILED STEPS
To restore the default and have the switch forward packets destined for a subnet of a network with no network default
route to the best supernet route possible, use the ip classless global configuration command.
EXAMPLE
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# no ip classless
Switch(config)# end
Configuring Address Resolution Methods
You can control interface-specific handling of IP by using address resolution. A device using IP can have both a local
address or MAC address, which uniquely defines the device on its local segment or LAN, and a network address, which
identifies the network to which the device belongs. To communicate with a device on Ethernet, the software must learn
the MAC address of the device. The process of learning the MAC address from an IP address is called address resolution.
The process of learning the IP address from the MAC address is called reverse address resolution.
The switch can use these forms of address resolution:
Host
128.20.1.0
128.20.2.0
128.20.3.0
128.20.4.1
128.0.0.0/8
128.20.4.1
Bit bucket
45748
128.20.0.0
Command Purpose
1. configure terminal Enter global configuration mode.
2. no ip classless Disable classless routing behavior.
3. end Return to privileged EXEC mode.
4. show running-config Verify your entry.
5. copy running-config startup-config (Optional) Save your entry in the configuration file.
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