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9-39
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 9 Configuring Resource Management
Configuring Service Class Overbooking
Max aggregate guaranteed services: none RX, none TX
Max bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX,
none abr RX, none abr TX, none ubr RX, none ubr TX
Min bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX,
none abr RX, none abr TX, none ubr RX, none ubr TX
Best effort connection limit: disabled 0 max connections
Max traffic parameters by service (rate in Kbps, tolerance in cell-times):
Peak-cell-rate RX: none cbr, none vbr, none abr, none ubr
Peak-cell-rate TX: none cbr, none vbr, none abr, none ubr
Sustained-cell-rate: none vbr RX, none vbr TX
Minimum-cell-rate RX: none abr, none ubr
Minimum-cell-rate TX: none abr, none ubr
CDVT RX: none cbr, none vbr, none abr, none ubr
CDVT TX: none cbr, none vbr, none abr, none ubr
MBS: none vbr RX, none vbr TX
Resource Management state:
Available bit rates (in Kbps):
72959 cbr RX, 72959 cbr TX, 72959 vbr RX, 72959 vbr TX,
72959 abr RX, 72959 abr TX, 72959 ubr RX, 72959 ubr TX
Allocated bit rates:
0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX,
0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX
Best effort connections: 0 pvcs, 0 svcs
Configuring Service Class Overbooking
The interface overbooking feature, described in the “Configuring Interface Overbooking” section on
page 9-37, increases the overall equivalent bandwidth available for all service categories including CBR
on an interface beyond the maximum cell rate that is possible on an interface.
The service class overbooking feature enables you to configure overbooking on an individual service
category and per interface basis on ATM and IMA interfaces. The service categories VBR-rt, VBR-nrt,
ABR and UBR+ can be overbooked.
Note Overbooking of the CBR service category is not allowed.
If a service category is configured with an overbooking percentage on an interface, the guaranteed
bandwidth allocated (on the Rate Scheduler) for a VC belonging to that service category is scaled down
to allow more VCs of that service category.
Service class overbooking configuration and interface overbooking configuration cannot co-exist on the
same ATM and IMA interface. These two modes are mutually exclusive and are configurable on a per
interface basis (on an ATM or IMA interface).
The following restrictions apply to service class overbooking:
• Service class overbooking is not supported on regular VP tunnels.
• If the overbooking configuration results in a maximum guaranteed services bandwidth that is below
the currently allocated bandwidth guarantees on an interface, the configuration is rejected.
• When an interface is overbooked with traffic, cell flow through the well-known VCs might be
reduced.
• Service Class overbooking configuration is not supported on switches with FC-PCQ (Feature Card
Per-Class Queuing) installed.