Software Overview

This chapter describes all the software components of the ERX system. It includes a general overview of the software architecture and information on software traffic flow, access protocols, routing protocols, and the QoS mechanisms.

Topic	Page
Architecture Overview	page 2
Software Summary	page 3
ERX Software Traffic Flow	page 5
IP	page 9
IPSec	3-23
DS3/DS1/E3/E1	3-25
SONET	page 27
Switched Multimegabit Data Service (SMDS)	3-29
Routing	page 29
QoS	page 47
Policy Management	page 55
Dynamic Interfaces	3-58
B-RAS Support	page 60
DHCP Local Server	page 66
L2TP	3-65
L2F	page 65
VLAN Support	3-68