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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
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Chapter 38 Configuring IP Unicast Routing
Configuring IP Addressing
Figure 38-3
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.
Beginning in privileged EXEC mode, follow these steps to disable classless routing:
To restore the default so that the switch forwards packets destined for a subnet of a network without a
network default route to the best possible supernet route, 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 a 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.
Note
In a switch stack, network communication uses a single MAC address and the IP address of the stack.
The local address or the 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 an Ethernet device, 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
.
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
Step 1
configure terminal
Enter global configuration mode.
Step 2
no ip classless
Disable classless routing behavior.
Step 3
end
Return to privileged EXEC mode.
Step 4
show running-config
Verify your entry.
Step 5
copy running-config startup-config
(Optional) Save your entry in the configuration file.
