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Configuring IP Addressing
Table 34-1 Default Addressing Configuration (continued)
Feature
IP default gateway
IP directed broadcast
IP domain
IP forward-protocol
IP helper address
IP host
IRDP
IP proxy ARP
IP routing
IP subnet-zero
Assigning IP Addresses to Network Interfaces
An IP address identifies a location to which IP packets can be sent. Some IP addresses are reserved for
special uses and cannot be used for host, subnet, or network addresses. RFC 1166, "Internet Numbers,"
contains the official description of IP addresses.
An interface can have one primary IP address. A mask identifies the bits that denote the network number
in an IP address. When you use the mask to subnet a network, the mask is referred to as a subnet mask.
To receive an assigned network number, contact your Internet service provider.
Beginning in privileged EXEC mode, follow these steps to assign an IP address and a network mask to
a Layer 3 interface:
Command
Step 1
configure terminal
Step 2
interface interface-id
Catalyst 3750 Switch Software Configuration Guide
34-6
Default Setting
Disabled.
Disabled (all IP directed broadcasts are dropped).
Domain list: No domain names defined.
Domain lookup: Enabled.
Domain name: Enabled.
If a helper address is defined or User Datagram Protocol (UDP) flooding is
configured, UDP forwarding is enabled on default ports.
Any-local-broadcast: Disabled.
Spanning Tree Protocol (STP): Disabled.
Turbo-flood: Disabled.
Disabled.
Disabled.
Disabled.
Defaults when enabled:
Broadcast IRDP advertisements.
•
Maximum interval between advertisements: 600 seconds.
•
Minimum interval between advertisements: 0.75 times max interval
•
Preference: 0.
•
Enabled.
Disabled.
Disabled.
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the Layer 3
interface to configure.
Chapter 34
Configuring IP Unicast Routing
78-16180-02
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Troubleshooting
