Cisco MGX 8850 Command Reference Manual page 453

Chapter 6 Logical Node, Port, and Signaling Commands
-maxvc
-minvc
-maxvcbw
Related Commands
dsppnportcac
Attributes
Log: log
Usage Guidelines
This section uses three examples to describe the booking factor.
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Release 2.0, Part Number 78-10467-04 Rev C0, October 2001
The max-vc-percent is the maximum percentage of VCs for a service category
on this port.
Range: 0–100
Default: 100
The min-vc-percent is the minimum percentage of VCs for a service category on
this port.
Range: 0–100
Default: 0
The max-vc-bw is the maximum number of cells per second specified by the
PCR allowed for a VC in a service category on this port.
Range: 0 through the maximum possible line rate
Default: 0 (disabled)
State: active
For no overbooking or oversubscription, suppose that a user has a 100-Mbit link and the booking
factor is 100.
PNNI advertises 100 Mbits to the network.
The link on the service module is configured for 100 Mbits.
A booking factor less than 100% results in link oversubscription because the bandwidth booked for
each connection exceeds the configured bandwidth for the connection. This situation is referred to
as overbooking.
Suppose that, for the same 100-Mbit link, the booking factor is 10.
PNNI advertises 1000 Mbits (calculated by 100 * 100/10 = 1000)
The link is configured on the service module for 100 Mbits.
Booking factors greater than 100% result in link undersubscription, and the bandwidth booked for
a connection exceeds the connection's configured bandwidth. This situation is referred to as
underbooking.
For the same 100-Mbit link, the booking factor is 200.
PNNI advertises 50 Mbits (calculated as 100 * 100/200 = 50)
The link is configured on the service module for 100 Mbits.
The policing bandwidth is based on the configured bandwidth and not the book factor. For a 10-Mbit
connection, the policing is 10 Mbits, regardless of the booking factor.
Privilege: GROUP1
Cisco MGX 8850 Routing Switch Command Reference
cnfpnportcac
6-35