Configuring Address Resolution Methods - Cisco Catalyst 3750 Software Configuration Manual
Metro switch
Hide thumbs
Also See for Catalyst 3750:
- Command reference manual (1154 pages) ,
- Hardware installation manual (231 pages) ,
- Message manual (120 pages)
Table of Contents
Advertisement
Chapter 28
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 28-3 No IP Classless Routing
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 determine the MAC address of the device. The process of
determining the MAC address from an IP address is called address resolution. The process of
determining the IP address from the MAC address is called reverse address resolution.
78-15870-01
28-3, the router in network 128.20.0.0 is connected to subnets 128.20.1.0, 128.20.2.0, and
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.
Catalyst 3750 Metro Switch Software Configuration Guide
Configuring IP Addressing
28-7
Advertisement
Table of Contents
Troubleshooting
