Cisco Cisco Packet Data Gateway (PDG)

 

▄  VPC-VSM System Administration Guide, StarOS Release 19 

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Passing user data frames to/from packet processing CPUs 

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Modifying, adding, or stripping datalink/network layer headers 

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Recalculating checksums 

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Maintaining statistics 

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Managing external Ethernet interfaces 

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Card/Slot/Port (CSP): Coordinates the events that occur when any card is inserted, locked, unlocked, removed, 

shutdown, or migrated. CSP also performs auto-discovery and configures ports on a newly-inserted interface 
card. It determines how interface cards map to packet processing cards. 

The CSP subsystem runs only on the active management card and synchronizes the information it contains 
with the SCT subsystem on the standby management card. It is started by the SIT subsystem and monitored by 
the HAT subsystem. 

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Session Manager (SM): Performs high-touch processing of mobile subscribers’ packet-oriented data session 

flows. High-touch user data processing consists of the following: 

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Payload transformation 

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Filtering and scheduling 

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Statistics collection 

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Policing