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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 Configuration
The characteristics of rt-VBR or nrt-VBR are supported by appropriately configuring the parameters of
the VBR connection.
Note
When configuring a rt-VBR connection, the trunk cell routing restriction prompt does not occur, as
rt-VBR connection routing is automatically restricted to ATM trunks.
Connection Criteria for real-time VBR and nonreal-time VBR Connections
The following are the requirements for rt-VBR and nrt-VBR connections:
•
Default utilization for voice traffic is 100 percent.
•
For rt-VBR connections, all nodes must be running at least Release 9.2.20. The command line
interface will block you from adding rt-VBR connections in a network running pre-9.2.20 switch
software
•
When upgrading to Release 9.2.20, all existing VBR connections are redesignated as nrt-VBR
connections.
•
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.
•
In Release 9.2.20, 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 only be routed over ATM trunks; rt-VBR traffic should not be routed over FastPacket
trunks.)
•
With Release 9.2.20, rt-vbr is supported only on single-segment connections (for example, CPE to
BXM to BXM to CPE). Later releases will support 2 and 3 segment connections, for example with
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).
The parameters for a VBR connection are shown in Figure 21-7 in the sequence in which they occur
during the execution of the
addcon
command. The VBR policing definitions are summarized in
Содержание BPX 8650
Страница 49: ...P A R T 1 The BPX Switch ...
Страница 50: ......
Страница 159: ...P A R T 2 Installation ...
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Страница 273: ...P A R T 3 Initial Configuration and Network Management ...
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Страница 311: ...P A R T 4 Configuring Connections ...
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Страница 487: ...P A R T 5 Troubleshooting and Maintenance ...
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Страница 533: ...P A R T 6 BPX Specifications ...
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Страница 555: ...P A R T 7 Appendices ...
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