21-16
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
rt-VBR and nrt-VBR Connections
Example of cnftrk:
pubsbpx1
TN
silves
BPX 8620
9.3 Aug. 1 2000 14:43 PDT
TRK
2.4 Config
OC3
[353207cps]
BXM slot:
2
Transmit Rate:
353208
Line framing:
STS-3C
Protocol By The Card:
No
coding:
--
VC Shaping:
No
CRC:
--
Hdr Type NNI:
Yes
recv impedance:
--
Statistical Reserve:
1000
cps
cable type:
--
Idle code:
7F hex
length:
--
Connection Channels:
256
Pass sync:
No
Traffic:V,TS,NTS,FR,FST,CBR,NRT-VBR,ABR, T-VBR
clock:
No
SVC Vpi Min:
0
HCS Masking:
Yes
SVC Channels:
0
Payload Scramble:
Yes
SVC Bandwidth:
0
cps
Frame Scramble:
Yes
Restrict CC traffic:
No
Virtual Trunk Type:
--
Link type:
Terrestrial
Virtual Trunk VPI:
--
Routing Cost:
10
Deroute delay time:
0 seconds
This Command: cnftrk 2.4
Transmit Rate [ 1-353208 ]:
rt-VBR and nrt-VBR Connections
VBR (variable bit rate) connections may be classified as either:
•
real time (rt-VBR)
This category is used for connections that transmit at a rate varying with time and that can be
described as bursty, often requiring large amounts of bandwidth when active. The rt-VBR class is
intended for applications that require tightly constrained delay and delay variation such as
compressed voice video conferencing—for example, video conferencing which requires real-time
data transfer with bandwidth requirements that can vary in proportion to the dynamics of the video
image at any given time. The rt-VBR category is characterized in terms of PCR, SCR (sustained
cell rate), and MBS (maximum burst size).
•
non-real time (nrt-VBR)
This category is used for connections that are bursty but are not constrained by delay and delay
variation boundaries. For those cells in compliance with the traffic contract, a low cell loss is
expected. Non-time critical data file transfers are an example of an nrt-VBR connection. A nrt-VBR
connection is characterized by PCR, SCR, and MBS.
Configuring VBR connections
The characteristics of rt-VBR or nrt-VBR are supported by appropriately configuring the parameters of
the VBR connection.
When configuring a rt-VBR connection, the trunk cell routing restriction prompt does not display,
because rt-VBR connection routing is automatically restricted to ATM trunks.
Содержание BPX 8600 Series
Страница 43: ...P A R T 1 The BPX Switch ...
Страница 44: ......
Страница 151: ...P A R T 2 Installation ...
Страница 152: ......
Страница 261: ...P A R T 3 Initial Configuration and Network Management ...
Страница 262: ......
Страница 291: ...P A R T 4 Configuring Connections ...
Страница 292: ......
Страница 481: ...P A R T 5 Troubleshooting and Maintenance ...
Страница 482: ......
Страница 531: ...P A R T 6 BPX Specifications ...
Страница 532: ......
Страница 563: ...P A R T 7 Appendices ...
Страница 564: ......
Страница 624: ...Glossary 24 Cisco BPX 8600 Series Installation and Configuration Release 9 3 0 Part Number 78 10674 01 Rev D0 July 2001 ...
Страница 630: ...Index 6 Cisco BPX 8600 Series Installation and Configuration Release 9 3 0 Part Number 78 10674 01 Rev D0 July 2001 ...