Specifications

21-3
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Chapter 21 Configuring ATM Connections
Traffic Management Overview
Figure 21-1 ATM Connections over a BPX Switch Network
Traffic Management Overview
The ATM Forum Traffic Management 4.0 Specification defines five basic traffic classes:
• CBR (Constant Bit Rate)
• rt-VBR (Real-Time Variable Bit Rate)
• nrt-VBR (Non-Real Time Variable Bit Rate)
• UBR (Unspecified Bit Rate)
• ABR (Available Bit Rate)
Table 21-1 summarizes the major attributes of each of the traffic management classes:
BXM
BNI
BXM
BNI
BPX switch
ASI
BNI BNI
BPX switch
BXM
BNI
BXM
BNI
BPX switch
BNI
BXMBXM
CPE
CPE
BPX switch
IGX
switch
CPE
CPE
CPE
CPE
POP
ATM
network
MGX
8220
MGX
8220
IGX
shelf
Frame
Relay
T1/E1
Frame Relay
CES
ATM
T1/E1
Frame Relay
CES
ATM
Frame Relay
Data Voice
Multimedia
ATM (T3/E3/OC3)
T3/E3/OC3
ATM
(T3/E3/
OC3/OC12)
ATM
(T3/E3/
OC3/OC12)
ATM (T3/E3)
ATM
(T3/E3)
ATM
(T3/E3)
ATM
(T3/E3/OC3/OC12)
T3/E3
MGX
8220
Frame Relay
CES
ATM
ATM (T3/E3/OC3)
ATM
(T3/E3/OC3/OC12)
ATM
(T3/E3/
OC3/OC12)
ATM (T3/E3)
ATM (T3/E3)
ATM (T3/E3/OC3/OC12)
ATM
(T3/E3/OC3)
28811
BPX MPLS
network
Table 21-1 Standard ATM Traffic Classes
Attribute CBR rt-VBR nrt-VBR UBR ABR
Traffic Parameters
PCR&CDVTxxx xx
SCR & MBS x x