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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.10, Part Number 78-11603-01 Rev. D0, July 2001
Chapter 21 Configuring ATM Connections
ATM Connection Flow
Figure 21-3 ATM Connection Flow via BPX Switches
Traffic Shaping for Cbr, rt-Vbr, nrt-Vbr, and Ubr
With the introduction of traffic shaping for Cbr, Vbr, and Ubr, you have the option to provide traffic
shaping for these connections types on the BXM. Previously, only Abr utilized traffic shaping. Traffic
shaping involves passing Cbr, Vbr, or Ubr traffic streams through VC queues for scheduled rate
shaping.
Traffic shaping is performed on a per port basis. When traffic shaping is enabled, all traffic exiting the
port (out to the network) is subject to VC scheduling based on the parameters you configure for the
connection.
CPE 1
ATM
trunk qbins (cnftrkparm)
per card slot server
qbins (clp hi, clp lo, efci,
etc., same as cnftrkparm)
vc qbin-per vc (16K to 64K)
(clp hi, clp lo, efci, etc., same as
cnfportq)
traffic shaping ckts
BXM 3
BXM 10
CPE 2
BCC crosspoint
switch
BPX 1
BXM 5
BXM 11
port qbins (cnfportq)
LEGEND:
In
Out
In
In
Ingress
Out
Service
Line
Network
Trunk
Out
Egress
Service
Line
BPX 2
cbr
rt-vbr.
nrt-vbr
ubr/abr
policing
high priority
TS
NTS
Bursty Data A
Bursty Data B
cbr
rt-vbr & voice
nrt-vbr
abr
ubr
Qbins 11-16
svc queue pool
MPLS queues
high priority
TS
NTS
Bursty Data A
Bursty Data B
cbr
rt-vbr
nrt-vbr
abr
ubr
Qbins 11-16
svc queue pool
MPLS queues
16 CoS per each of 31 Virtual I/Fs
16 CoS per each of 15 slot
servers
ATM Cell Flow, Simplified
28825