Cisco ASR 900 A903-RSP1A-55 Cisco ASR 900 series module / router
Brand: Cisco | Category: Network Equipment
SKU: CSC-A903-RSP1A-55 | Part #: A903-RSP1A-55 | MPN: A903-RSP1A-55
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About the Cisco ASR 900 A903-RSP1A-55 Cisco ASR 900 series module / router
The Cisco ASR 900 A903-RSP1A-55 is a Route Switch Processor module engineered for high-performance aggregation in enterprise and service-provider networks, delivering 55 Gbps system throughput. This field-replaceable Route Switch Processor (RSP) module is purpose-built for the Cisco ASR 903 Router, enabling network engineers to deploy carrier-grade routing and switching capabilities with advanced traffic management and resilience features. Running Cisco IOS XE Software, the A903-RSP1A-55 provides the control plane and forwarding intelligence needed for demanding WAN aggregation, branch consolidation, and multi-service edge deployments.
The module supports comprehensive MPLS functionality—including L2VPN, L3VPN, pseudowire, and segment routing—making it ideal for service-provider networks and enterprises requiring advanced VPN and traffic engineering. Built-in timing and synchronization capabilities encompass IEEE 1588v2 Precision Time Protocol (PTP) and Synchronous Ethernet (SyncE), ensuring reliable clock distribution across distributed sites. High-availability features include Stateful Switchover (SSO) and Non-Stop Forwarding (NSF), enabling seamless failover when paired with a redundant RSP module. Ethernet OAM compliance with ITU-T Y.1731 and IEEE 802.3ah standards supports proactive service monitoring. Hierarchical QoS with per-service traffic shaping and policing allows granular control of application priorities. Management options include console access, out-of-band Ethernet management, NETCONF, YANG model-driven capabilities, and traditional CLI—giving network operations teams flexible automation and orchestration pathways.
Typical Enterprise and Service-Provider Scenarios
- WAN aggregation and core-to-edge routing with multi-service MPLS VPN backhaul
- Branch office consolidation requiring stateful redundancy and non-stop forwarding
- Carrier networks deploying segment routing and pseudowire services across distributed nodes
- Clock synchronization and timing-sensitive applications leveraging IEEE 1588v2 PTP and SyncE
- Service-provider edge platforms requiring per-service QoS hierarchies and Ethernet OAM compliance
Contact Omnixon Global to request a quotation for the Cisco ASR 900 A903-RSP1A-55 and explore how this routing module can optimize your network infrastructure.
Technical Specifications
| Brand | Cisco |
| Category | Network Equipment |
| SKU | CSC-A903-RSP1A-55 |
| Part Number | A903-RSP1A-55 |
| Condition | New |
| Form Factor | Rack-Mount |
| Manufacturer Part Number | A903-RSP1A-55 |
| Product Series | Cisco ASR 900 Series |
| Platform Compatibility | Cisco ASR 903 Router |
| Module Type | Route Switch Processor (RSP) |
| System Throughput | 55 Gbps |
| Operating System | Cisco IOS XE Software |
| MPLS Support | Yes — MPLS L2VPN, L3VPN, pseudowire, segment routing |
| Timing and Synchronization | IEEE 1588v2 PTP (Precision Time Protocol), Synchronous Ethernet (SyncE) |
| Ethernet OAM | ITU-T Y.1731, IEEE 802.3ah |
| High Availability | Stateful Switchover (SSO), Non-Stop Forwarding (NSF) |
| QoS | Hierarchical QoS (HQoS) with per-service traffic shaping and policing |
| Management Interfaces | Console, out-of-band management Ethernet port |
| Programmability | NETCONF, YANG model-driven management; CLI |
| Form Factor | Field-replaceable module (RSP) for ASR 903 chassis |
| Redundancy | Supports RSP redundancy with paired RSP module in chassis |
| Regulatory Compliance | Cisco standard enterprise and service-provider certifications |
| Product Line | Cisco ASR 900 Aggregation Services Router |
Frequently Asked Questions about Cisco ASR 900 A903-RSP1A-55 Cisco ASR 900 series module / router
What does the Cisco ASR 900 A903-RSP1A-55 Cisco ASR 900 series module / router do?
The Cisco ASR 900 A903-RSP1A-55 Cisco ASR 900 series module / router is enterprise networking hardware for data-center, campus, and branch deployments. Common roles include core/distribution switching, server uplinks, top-of-rack fabric, and edge connectivity in mixed Cisco/Juniper/Arista environments.
Is the Cisco ASR 900 A903-RSP1A-55 Cisco ASR 900 series module / router compatible with my infrastructure?
The Cisco ASR 900 A903-RSP1A-55 Cisco ASR 900 series module / router interoperates with standard switching protocols (LACP, MLAG/VPC, 802.1Q, OSPF/BGP). For specific cross-vendor scenarios — Cisco-to-Arista MLAG peering, fabric integration with Cumulus/SONiC, or migration from legacy Catalyst — our network engineers map a compatibility plan as part of the RFQ.