Cisco uBR10012 Software Configuration Manual page 106

Supported Software Features for the Cisco uBR10012 Router
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Different COPS client and UDP port for COPS sessions—PCMM uses a different COPS client
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type than does basic PacketCable, and PCMM uses a different UDP port for its COPS sessions. This
can help to distinguish between PacketCable and PCMM COPS sessions on the Cisco CMTS.
• MultiMedia State Machine—PCMM supports a different MultiMedia state machine than does
PacketCable. The following are machine state changes introduced in PCMM with Cisco IOS Release
12.3(13a)BC:
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• Event management—Event management messages have been modified to include information on
the modified traffic profiles, and to match changes in the PCMM state machine. In addition, objects
have been added to help support Gate usage and Gate commit time objects, used for usage limit
based and time based gates.
For additional information about PacketCable and PacketCable Multimedia on the Cisco CMTS, refer to
the following documents on Cisco.com:
PacketCable and PacketCable Multimedia on the Cisco CMTS
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http://www.cisco.com/en/US/docs/cable/cmts/feature/guide/ufg_pkcb.html
Cisco uBR10012 Universal Broadband Router Software Configuration Guide
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Gate-Delete
Gate-Delete-Ack
Gate-Delete-Err
State-Report
PCMM gates are all unidirectional. In PacketCable, each gate is associated with both an
upstream and downstream service flow. Although unidirectional flows are allowed, a
bidirectional phone connection only has one gate.
PCMM differs in that each gate is now unidirectional, and is associated with only one service
flow. As a result, the gate info element structure in PCMM differs significantly from that of
PacketCable. PCMM only needs to maintain one set of service flow information, rather than
maintaining both upstream and downstream information as does PacketCable.
DOCSIS DSX service flow information is now maintained on the Cisco CMTS. With
PacketCable, gates are authorized, reserved, or committed first on the Cisco CMTS with a
specific gate ID, and then the Cisco CMTS initiates a DSX exchange using the reserved or
committed gate ID in the message. With PacketCable, the cable modem must issue the DSX
message and create the service flows. However, with PCMM, when a gate is reserved or
committed, the DSX message is generated and sent immediately by the Cisco CMTS. Therefore,
the Policy Server sends all of the service flow information necessary to setup the service flow
to the Cisco CMTS instead of the cable modem. This causes a major change in the state machine
that controls the gate allocation procedures.
New timer definitions and event actions are supported on PCMM. New timer definitions and
timer event actions are supported for proper behavior of the net state machine. Some of the
timers used with PacketCable have been eliminated, while the events associated with other
times have changed for PCMM.
New state transitions that did not exist in PacketCable 1.x have been added to PCMM.
Specifically, a gate can now be transitioned back from Committed to Authorized or Reserved state.
Cable interface line cards and broadband processing engines perform distributed DOCSIS
functions. The Cisco MC28U cable interface line card on the Cisco uBR7200 series routers, and
all the line cards on the Cisco uBR10012 router, are considered distributed, because the DOCSIS
functionality is performed by the line card processor. The GCP signaling for PCMM and the gate
state machine will executed on the NPE or RP processor. Because of the split in this functionality,
IPC signaling resides between the gate state machine and the DOCSIS layer processing.
Chapter 1 Overview of Cisco uBR10012 Universal Broadband Router Software
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