Cisco BPX-BXM-155-8DX Installation And Configuration Manual page 309

Chapter 21 Configuring ATM Connections
With Rel. 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 non-real 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.
For a new node running software release 9.2.20 or later, the rt-VBR connection class number is 3.
However, an upgraded node will retain existing connection classes. Therefore, it won't have the rt-VBR
connection class 3.
For nrt-VBR connections in a new node, running 9.2.20, a number of connection classes are
pre-configured, including 2, 4, 5, and 6.
Examplef cnfcls 3, for rt-VBR
pubsbpx1
Class:
PCR(0+1)
4000/4000
1000/1000
This Command: cnfcls atm 3
Enter class type (rt-VBR, nrt-VBR, CBR, UBR, ABRSTD, ABRFST, ATFR, ATFST, ATFT,
ATFTFST, ATFX, ATFXFST):
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
TN silves:1
ATM Connection Classes
3
% Util
100/100
MBS Policing
3
Description: "Default rt-VBR 4000 "
BPX 8620 9.2.20 July 16 2000 10:42 PDT
CDVT(0+1) AAL5 FBTC
10000/10000 n
Cisco BPX 8600 Series Installation and Configuration
rt-VBR and nrt-VBR Connections
Type: rt-VBR
SCR
4000/4000
21-17