Chapter 29 Ip Commands - Alcatel-Lucent OmniSwitch 6250 Cli Reference Manual

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This chapter details Internet Protocol (IP) commands for the switch. IP is a network-layer (Layer 3) proto-

col that contains addressing information and some control information that enables packets to be

forwarded. IP is documented in RFC 791 and is the primary network-layer protocol in the Internet proto-

col suite. Along with the Transmission Control Protocol (TCP), IP represents the heart of the Internet

IP is enabled on the switch by default and there are few options that can, or need to be, configured. This

chapter provides instructions for basic IP configuration commands. It also includes commands for several

Layer 3 and Layer 4 protocols that are associated with IP:

Address Resolution Protocol (ARP)—Used to match the IP address of a device with its physical

(MAC) address.

Internet Control Message Protocol (ICMP)—Specifies the generation of error messages, test packets,

and informational messages related to IP. ICMP supports the

Transmission Control Protocol (TCP)—A major data transport mechanism that provides reliable,

connection-oriented, full-duplex data streams. While the role of TCP is to add reliability to IP, TCP

relies upon IP to do the actual delivering of datagrams.

User Datagram Protocol (UDP)—A secondary transport-layer protocol that uses IP for delivery. UDP

is not connection-oriented and does not provide reliable end-to-end delivery of datagrams. But some

applications can safely use UDP to send datagrams that do not require the extra overhead added by

The IP commands also include protection from Denial of Service (DoS) attacks. The goal of this feature is

to protect a switch from well-known DoS attacks and to notify the administrator or manager when an

attack is underway. Also, notifications can be sent when port scans are being performed.

Note. Packets can be forwarded using IP if all devices are on the same VLAN, or if IP interfaces are

created on multiple VLANs to enable routing of packets. However, IP routing requires the Routing Infor-

mation Protocol (RIP). See

information on VLANs and RIP, see the applicable chapter(s) in the OmniSwitch 6250 Network Configu-

ration Guide.

OmniSwitch 6250 CLI Reference Guide

29 IP Commands

Chapter 33, "RIP Commands,"

November 2009

command used to determine if hosts

for the appropriate CLI commands. For more