Specifications
21-20
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
Trunk Queues for rt-VBR and nrt-VBR
A rt-VBR connection uses the rt-VBR queue on a trunk. It shares this queue with voice traffic. The
rt-VBR and voice traffic shares the default or user configured parameters for the rt-VBR queue. These
parameters are queue depth, queue CLP high and CLP low thresholds, EFCI threshold, and queue
priority.
A nrt-VBR connection uses the nrt-VBR queue on a trunk. The configurable parameters are queue
depth, queue CLP high and CLP low thresholds, EFCI threshold, and queue priority.
You can configure the qbin values separately for rt-VBR and nrt-VBR classes on trunks by using the
cnftrkparm command.
• For rt-VBR, the cnftrkparm command configures Q-depth rt-VBR and Max Age rt-VBR.
• For nrt-VBR, the cnftrkparm command configures Q-depth nrt-VBR, Low CLP nrt-VBR, and
High CLP nrt-VBR.
This example shows the cnftrkparm screen and the parameters that can be configured for the various
service type queues:
pubsbpx1 TN silves:1 BPX 8620 9.2.2G July 16 1999 10:50 PDT
TRK 2.4 Parameters
1 Q Depth - rt-VBR [ 885] (Dec) 15 Q Depth - CBR [ 600] (Dec)
2 Q Depth - Non-TS [ 1324] (Dec) 16 Q Depth - nrt-VBR [ 5000] (Dec)
3 Q Depth - TS [ 1000] (Dec) 17 Q Depth - ABR [20000] (Dec)
4 Q Depth - BData A [10000] (Dec) 18 Low CLP - CBR [ 60] (%)
5 Q Depth - BData B [10000] (Dec) 19 High CLP - CBR [ 80] (%)
6 Q Depth - High Pri [ 1000] (Dec) 20 Low CLP - nrt-VBR [ 60] (%)
7 Max Age - rt-VBR [ 20] (Dec) 21 High CLP - nrt-VBR [ 80] (%)
8 Red Alm - I/O (Dec) [ 2500 / 10000]22 Low CLP/EPD-ABR [ 60] (%)
9 Yel Alm - I/O (Dec) [ 2500 / 10000]23 High CLP - ABR [ 80] (%)
10 Low CLP - BData A [ 100] (%) 24 EFCN - ABR [ 20] (%)
11 High CLP - BData A [ 100] (%) 25 SVC Queue Pool Size [ 0] (Dec)
12 Low CLP - BData B [ 25] (%)
13 High CLP - BData B [ 75] (%)
14 EFCN - BData B [ 30] (Dec)
This Command: cnftrkparm 2.4
Port Queues for rt-VBR and nrt-VBR
The rt-VBR and nrt-VBR connections use different queues on a port, these are the rt-VBR and nrt-VBR
queues, respectively. You can configure these separately by using the cnfportq command.
The following example shows he configuration parameters available for a port queue.