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13
An Introduction to IP Routing Protocols
This chapter provides an introduction to IP routing and IP routing protocols
used in the Nortel Ethernet Routing Switch 5500 Series. Subsequent
chapters will provide a more detailed description of switch capabilities and
configuration procedures.
IP routing
To configure IP routing on the Nortel Ethernet Routing Switch 5500 Series,
use virtual local area networks (VLAN) to create virtual router interfaces by
assigning an IP address to the VLAN. This section discusses this concept
in depth.
For a more detailed description about VLANs and their use, consult Nortel
Ethernet Routing Switch 5500 Series Release 5.1 Configuration - VLANs,
Spanning Tree, and Link Aggregation.
IP addressing
An IP version 4 (IPv4) address consists of 32 bits expressed in a
dotted-decimal format (XXX.XXX.XXX.XXX). The IPv4 address space is
divided into classes, with classes A, B, and C reserved for unicast addresses
and accounting for 87.5 percent of the 32-bit IP address space. Class D
is reserved for multicast addressing. " IP address classifications" (page
13)lists the breakdown of the IP address space by address range and mask.
IP address classifications
Class
Address Range Mask
Number of
Networks
Nodes per
Network
A
1.0.0.0 - 127.0.0.0 255.0.0.0 127 16,777,214
Note: Although technically part of Class A addressing, network 127 is reserved
for loopback.
B
128.0.0.0 -
191.255.0.0
255.255.0.0 16,384 65,534
C
192.0.0.0 -
223.255.255.0
255.255.255.0 2,097,152 255
Nortel Ethernet Routing Switch 5500 Series
Configuration-IP Routing Protocols
NN47200-503 03.01 Standard
5.1 27 August 2007
Copyright © 2005-2007, Nortel Networks
.