Cisco BPX 8650, Installation And Configuration Manual

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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
Connection Criteria
The following are the requirements for connection criteria:
•
Default utilization for voice traffic is 100 percent.
•
For rt-VBR connections, all nodes must be running at least Release 9.2.20. The user interface will
block the addition of rt-VBR connections in a network running pre-9.2.20 SWSW.
•
BXM and UXM (IGX switch) cards can terminate rt-VBR connections and support rt-VBR queues.
• On the BPX switch, BXM and BNI trunks support rt-VBR queues
•
On the IGX switch, only UXM trunks support rt-VBR queues.
• You can add both rt-VBR and nrt-VBR connections.The parameter prompts are the same for both
rt-VBR and nrt-VBR, except for Trunk Cell Routing Restriction prompt. (For rt-VBR connections,
the “Trunk Cell Routing Restriction” prompt will not display because rt-VBR traffic should be
routed over only ATM trunks; rt-VBR traffic should not be routed over FastPacket trunks.)
•
With release 9.3, rt-vbr is supported on 2- and 3-segment connections, but only on IGX feeders and
UXM endpoints. For example: the UXM card on the IGX switch (2 segment: CPE to IGX feeder
UXM to BXM to BXM to CPE) or (3 segment: CPE to IGX feeder UXM to BXM to BXM to IGX
feeder UXM to CPE).
Configuring Connection Policing
The BPX Command Line Interface (CLI) and Cisco WAN Manager accept the same connection policing
and bandwidth parameters as in previous releases for both rt-VBR and nrt-VBR service.
The displayed addcon parameter prompts for both rt-VBR and nrt-VBR connections are the same:
• PCR
•
%util
•
CDVT
•
FBTC flag
• SCR
•
MBS
• Policing Type
There is no change in CDVT usage and the previous policing system.
When using the addcon command without the extended parameters, rt-VBR connections automatically
use the parameters provided by connection class 3 which contains pre-determined values. Similarly,
nrt-VBR connections use connection class 2.
To modify the values of a connection class, use the commands cnfcls and cnfatmcl .
To display these values, use the commands dspcls and dspatmcls .