Specifications

21-31
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
ATM Connection Configuration
Figure 21-7 rt-VBR and nrt-VBR Connection Prompt Sequence
Available Bit Rate Connections
The ABR (available bit rate) category utilizes a congestion flow control mechanism to control
congestion during busy periods and to take advantage of available bandwidth during less busy periods.
The congestion flow control mechanism provides feedback to control the connections flow rate through
the network in response to network bandwidth availability.
Table 21-10 VBR Policing Definitions
Connection Type
ATM Forum TM spec.
4.0 conformance
definition
PCR Flow
(1st leaky
bucket)
CLP tagging
(for PCR
flow)
SCR Flow
(2nd leaky
bucket)
CLP tagging
(for SCR
flow)
rt/nrt-VBR, ABR, ATFR, ATFST,
ATFT, ATFTST, ATFX, ATFXFST
VBR.1
when policing set to 1
CLP(0+1) no CLP(0+1) no
rt/nrt-VBR, ABR, ATFR, ATFST,
ATFT, ATFTST, ATFX, ATFXFST
VBR.2
when policing set to 2
CLP(0+1) no CLP(0) no
rt/nrt-VBR, ABR, ATFR, ATFST,
ATFT, ATFTST, ATFX, ATFXFST
VBR.3
when policing set to 3
CLP(0+1) no CLP(0) yes
rt/nrt-VBR, ABR, ATFR, ATFST,
ATFT, ATFTST, ATFX, ATFXFST
when policing set to 4 CLP(0+1) no off n/a
rt/nrt-VBR, ABR, ATFR, ATFS,
ATFT, ATFTST, ATFX, ATFXFST
when policing set to 5
for off
off n/a off n/a
rt-VBR or nrt-VBR
PCR(0+1)
%Util
CDVT(0+1)
FBTC (AAL5 Frame based traffic control, enable/disable)
SCR
MBS
Policing (1, 2, 3, 4, or 5)
For policing prompt:
1 = VBR.1
2 = VBR.2
3 = VBR.3
4 = PCR policing only
5 = policing off
Note: BW allocation = (PCR)x(%Util)
For rt-VBR, trunk cell routing
is automatically restricted to
include only ATM trunks
28812
1
2
2
1
Trunk cell routing
restrict (Y/N) [Y]