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RSP Modules
The Cisco ASR 903 Router is designed to use up to two RSP modules to handle the data plane, network timing,
and control plane functionalities for the router. The RSP configuration allows you to use Cisco IOS software
to control chassis management, redundancy, external management, and system status indications on the router.
RSP features include:
• Loading software onto processor-based interface modules
• Redundant RSP management—The RSP manages detection of RSPs, exchange of health and status
information, role negotiation, function for detection, health and status exchange, role negotiation
• Packet processing
• Traffic management, including buffering, queuing, and scheduling, Ethernet MAC functions
• Network clocking functions including phase and time-of-day for BITS, 1 PPS, 10 MHz, and 1588 PTP
clock references.
• Storage of software images, system configuration, OBFL, SysLog
• PTP packet processing including IEEE 1588-2008 for recovering network timing (frequency, phase, and
time) from upstream PTP clocks, for generating PTP frequency and phase references as inputs to the
SETS, and for distributing them to downstream PTP clocks
• External management interfaces (RS232 console, management ENET, USB console, USB storage) and
system status LED indicators
Supported RSPs
The Cisco ASR 903 Router supports the following RSPs:
• A900-RSP1A-55—Provides 2 GB of SDRAM, 5 Mb of TCAM memory, 36Mb buffer table, 576-Mb
forwarding memory, and 1,536-Mb packet buffer memory.
• A900-RSP1B-55—Provides 4 GB of SDRAM, 20 Mb of TCAM memory, 144-Mb buffer table, 1152-Mb
forwarding memory, and 1,536-Mb packet buffer memory.
• A900-RSP2A-128—Provides 4 GB double data rate type three (DDR3) memory, 128 Gbps aggregate
throughput.
• A900-RSP2A-64—Provides 4 GB double data rate type three (DDR3) memory, 64 Gbps aggregate
throughput.
• A900-RSP3C-400-S—Provides 8 GB of SDRAM and non-volatile memory, 64MB flash memory, 40
Mb of TCAM memory, 400Gbps throughput.
• A900-RSP3C-200-S—Provides 8 GB of SDRAM and non-volatile memory, 64MB flash memory, 20
Mb of TCAM memory, 200Gbps throughput.
The Cisco ASR 903U Router supports the following RSPs:
• A900U-RSP2A-128—Provides 4-GB double data rate type three (DDR3) memory and 128-Gbps aggregate
throughput.
• A900U-RSP2A-64—Provides 4-GB double data rate type three (DDR3) memory and 64-Gbps aggregate
throughput.
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
12
Overview
RSP Modules