Connection Criteria For Real-Time Vbr And Non-Real-Time Vbr Connections - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

ATM Connection Configuration
The characteristics of rt-VBR or nrt-VBR are supported by appropriately configuring the parameters of
the VBR connection.
When configuring a rt-VBR connection, the trunk cell routing restriction prompt does not
Note
occur, as rt-VBR connection routing is automatically restricted to ATM trunks.

Connection Criteria for real-time VBR and non-real-time VBR Connections

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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
Table 21-9.
Cisco BPX 8600 Series Installation and Configuration
21-30
Default utilization for voice traffic is 100 percent.
For rt-VBR connections, all nodes must be running at least Rel. 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 Rel. 9.2.20, all existing VBR connections are re-designated 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).
Chapter 21 Configuring ATM Connections
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001