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FPC Description

The FPCs on a router house the Physical Interface Cards (PICs), which connect the router to network media. The main function of an FPC is to connect the PICs installed in it to the other router components.

In this manual, all types of FPCs, (including Enhanced FPCs) are referred to simply as “FPC,” except where the differences among them are discussed.

Interaction Between FPCs and PICs

On the M20, M40, and M40e Internet routers, an I/O Manager application-specific integrated circuit (ASIC) or ASICs on each FPC accepts incoming data packets from the PICs on the FPC and divides each packet into 64-byte cells. The cells are transferred to the forwarding component (the System and Switch Board [SSB] on the M20 router, the System Control Board [SCB] on the M40 router, and the Switching and Forwarding Module [SFM] on the M40e router). An ASIC on the forwarding component distributes the cells among the memory buffers located on and shared by all installed FPCs. An I/O Manager ASIC or ASICs on the FPC reassembles the data cells into a packet and passes the packet to the appropriate PIC for transmission to the network.

On the M320 and T320 Internet routers, each FPC contains one Packet Forwarding Engine. On the T640 Internet routing node, the FPC1 and FPC2 each contain one Packet Forwarding Engine, and the FPC3 and FPC4 each contain two Packet Forwarding Engines. The Packet Forwarding Engines receive incoming packets from the PICs installed on the FPC and forward them through the switch planes to the appropriate destination FPC and port. Each FPC contains data memory, which is managed by the Queuing and Memory Interface ASICs.

Enhanced FPCs

Enhanced Flexible PIC Concentrators (FPCs) are available for the M20, M40, and T320 routers and the T640 routing node. An Enhanced FPC has all the features of the corresponding standard (nonenhanced) FPC and provides additional SRAM memory for increased scalability and more granular class-of-service (CoS) capabilities.

Enhanced Plus FPCs

Enhanced Plus Flexible PIC Concentrators (FPCs) are available for the M20 and M40e routers. An Enhanced Plus FPC has all the features of the corresponding standard (nonenhanced) FPC and provides additional SRAM memory (from 2 to 4 MB on an Enhanced Plus FPC1 and 4 to 8 MB on an Enhanced Plus FPC2) for increased scalability, more granular CoS capabilities, and enhanced VPN scaling.

Enhanced II FPCs

Enhanced II Flexible PIC Concentrators (FPCs) are available for the M320, T320, and T640 routing platforms. An Enhanced II FPC has all the features of the corresponding standard and Enhanced FPCs and provides additional DRAM memory for QoS, tricolor marking, and scaling enhancements.

Enhanced Scaling FPC

Enhanced Scaling Flexible PIC Concentrators (FPCs) are available for the T640 routing node. An Enhanced Scaling FPC has all the features of the corresponding standard and Enhanced FPCs and provides additional forwarding features and scalability improvements. The Enhanced Scaling FPC4 is compatible with all currently supported T640 FPC1, FPC2, and FPC3 PIC combinations.

Table of Supported FPCs by Chassis

Table 1 lists the FPCs that each chassis supports. FPCs are chassis-specific. On a specific chassis, you can install an FPC into any FPC slot regardless of the PICs it contains. You can use any combination of slots.

For a list of FPCs that are no longer supported (and their end-of-support [EOS] dates), see the M-series and T-series Routing Platforms End-of-Life FPC Guide.

Table 1: Supported FPCs by Chassis

M20

M20/M40 Enhanced FPC

Enhanced Plus FPC1

M40

M20/M40 Enhanced FPC

M40e

FPC

FPC1

FPC2

Enhanced Plus FPC1

Enhanced Plus FPC2

M320

FPC1

FPC2

FPC3

Enhanced II FPC1

Enhanced II FPC2

Enhanced II FPC3

T320

FPC1

FPC2

FPC3

Enhanced FPC1

Enhanced FPC2

Enhanced FPC3

Enhanced II FPC1

Enhanced II FPC2

Enhanced II FPC3

T640

FPC2

FPC3

Enhanced FPC1

Enhanced FPC2

Enhanced FPC3

Enhanced II FPC1

Enhanced II FPC2

Enhanced II FPC3

Enhanced Scaling FPC4


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