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	page 22
DS3/DS1/E3/E1	3-24
SONET	page 26
Switched Multimegabit Data Service (SMDS)	3-28
Routing	page 29
QoS	page 41
Policy Management	page 48
Dynamic Interfaces	3-51
B-RAS Support	page 52
L2TP	3-57
L2F	page 57
MPLS Support	3-58
Encapsulating Layer 2 Services	3-62
DHCP Local Server	3-63
VLAN Support	3-65