Configuring Address Resolution Methods - Cisco ME 3400G-2CS - Ethernet Access Switch Software Configuration Manual

Chapter 32 Configuring IP Unicast Routing
In Figure
128.20.3.0. If the host sends a packet to 120.20.4.1, because there is no network default route, the router
discards the packet.
Figure 32-3
128.20.1.0
To prevent the switch from forwarding packets destined for unrecognized subnets to the best supernet
route possible, you can disable classless routing behavior.
Beginning in privileged EXEC mode, follow these steps to disable classless routing:
Command
Step 1
configure terminal
Step 2 no ip classless
Step 3
end
Step 4
show running-config
Step 5 copy running-config startup-config
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.

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.
The local address or MAC address is known as a data link address because it is contained in the data link
layer (Layer 2) section of the packet header and is read by data link (Layer 2) devices. 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.
78-17058-01
32-3, the router in network 128.20.0.0 is connected to subnets 128.20.1.0, 128.20.2.0, and
No IP Classless Routing
128.0.0.0/8
128.20.0.0
128.20.2.0
128.20.4.1
128.20.4.1
Bit bucket
128.20.3.0
Host
Purpose
Enter global configuration mode.
Disable classless routing behavior.
Return to privileged EXEC mode.
Verify your entry.
(Optional) Save your entry in the configuration file.
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
Configuring IP Addressing
32-7