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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 21 Configuring ATM Connections
ATM Connection Flow
The following is an example of the
cnftrk
command:
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 ]:
Configuring VBR Connections
The characteristics of rt-VBR or nrt-VBR are supported by appropriately configuring the parameters of
the VBR connection. For a description of the rt-VBR and nrt-VBR classificaitons, see the Variable Bit
Rate Connections section.
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.
With Release 9.2.20 and later, you specify rt-VBR and nrt-VBR connections separately when adding a
connection by using the
addcon
command. To do this, enter either
rt-vbr
or
nrt-vbr
to select the rt-VBR
or nrt-VBR connection class, respectively. Each connection is assigned the applicable associated default
parameters for its type of service.
For rt-VBR an additional queue, referred to as the rt-VBR queue, is used at a BXM port. At BXM or BNI
trunks, voice and rt-VBR traffic share a queue, referred to as the rt-VBR queue.
The rt-VBR and nrt-VBR service queues are configured differently from each other at both port ingress
and port egress queues. The rt-VBR typically uses smaller queues for low delay, whereas the nrt-VBR
queues are typically larger in size for more efficient bandwidth sharing with other nonreal time service
types.
The rt-VBR connections are configured per class 3 service parameters. The nrt-VBR connections are
configured per class 2 service parameters.
You can configure the connection classes to whatever service and parameters you want by:
•
Using the
cnfcls
and
cnfatmcls
commands.
•
Or, you can enter the parameters individually for each connection by specifying ‘yes’ to the
extended parameters prompt of the
addcon
command.
Содержание BPX 8650
Страница 49: ...P A R T 1 The BPX Switch ...
Страница 50: ......
Страница 159: ...P A R T 2 Installation ...
Страница 160: ......
Страница 273: ...P A R T 3 Initial Configuration and Network Management ...
Страница 274: ......
Страница 311: ...P A R T 4 Configuring Connections ...
Страница 312: ......
Страница 487: ...P A R T 5 Troubleshooting and Maintenance ...
Страница 488: ......
Страница 533: ...P A R T 6 BPX Specifications ...
Страница 534: ......
Страница 555: ...P A R T 7 Appendices ...
Страница 556: ......