Juniper Networks M-Series manual M20 Router, Key Components

M-series Routing Platforms

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M20 Router

Only 14 inches (35.56 cm) in height, the M20 design delivers increased port density, performance of 20+ Gbps throughput, scalability, and reliability in a space-efficient package. The M20 offers fully redundant hardware, including redundant switching fabrics and Routing Engines to increase system availability. The M20 supports 16 PICs and up to OC-48/STM-16 uplink speeds in a compact package ideal for the provider edge in medium and large PoPs.

M40e Router

The M40e router provides a dense, highly redundant platform primarily targeted for dense dedicated access aggregation and provider edge services in medium and large POPs. This 40+ Gbps platform supports 32 ejector-enabled PICs via 8 FPCs and up to OC-48/STM-16 uplink speeds in a half-rack package. The M40e offers common hardware redundancy including the switch fabrics, Routing Engines, fan trays, and power supplies. This platform supports M160 PICs and many PICs are forward-portable to the T-series routing platforms.

M160 Router

The M160 router offers up to 8 OC-192c/STM-64 PICs per chassis (16 per rack) or up to 32 OC-48c/STM-16 PICs per chassis (64 per rack) with up to 160+ Gbps throughput. The M160 platform is ideal for medium-sized backbone cores requiring predictable performance for feature-rich infrastructures and also supports provider edge services in 10-gigabits POPs. In addition, this platform is ideal where switching fabric and Routing Engine redundancy are required. All major components are field replaceable, increasing system serviceability and reliability, and decreasing mean time to repair. For investment protection and smooth migration path, this platform supports M40e PICs. As well, many PICs are forward-portable to the T-series routing platforms.

M320 Router

The M320 is a high performance, 10Gbps-capable, distributed architecture edge router. It offers up to 16 OC-192c/STM-64 PICs per chassis (32 per rack) or up to 64 OC-48c/STM-16 ports per chassis (128 per rack) with up to 320 Gbps throughput. The M320 platform is ideal for medium-sized backbone cores requiring predictable performance for feature-rich infrastructures and also supports provider edge services in 10-gigabit POPs with the ability to support up to 32 type 1 and type 2 PICs and up to 16 type 3 PICs for 10 Gbps uplinks. In addition, this platform is ideal where switching fabric and Routing Engine redundancy are required. All major components are field replaceable, increasing system serviceability and reliability, and decreasing mean time to repair. PICs are compatible with M40e, M160, T320, and T640.

Key Components

Key components of each M-series router are the Packet Forwarding Engine (PFE) and the Routing Engine.

•The PFE is a logical entity that is responsible for packet forwarding. It physically consists of the PICs, FPCs, FIC, control/system/forwarding board, and state-of-the-art ASICs

•Physical Interface Cards provide a complete range of fiber optic and electrical transmission interfaces to the network. For a listing of available PICs, see the M-series PICs and FPCs datasheet.

•Flexible PIC Concentrators house PICs and connect them to the rest of the PFE. FPCs parse, prioritize, and queue the packets before forwarding them across the midplane to the appropriate destination interface. On egress, FPCs prioritize, queue, re-assemble, and forward packets out through the appropriate port. Up to four PICs can be mixed and matched within a single FPC slot, increasing configuration flexibility and network scalability, while maximizing POP efficiency.

The FPC required depends on the platform and on the PICs that are needed. For a listing of available FPCs, see the M-series PICs and FPCs datasheet.

•The Fixed Interface Concentrator is available only on the M7i and contains either 2 fixed Fast Ethernet interfaces or 1 fixed Gigabit Ethernet Interface. The Gigabit Ethernet interface requires Small Form factor Pluggable optics (SFP ordered separately).

•On M7i, M10i, M20, M40e, and M160 platforms, the control/system/forwarding board performs route lookup and switching to the destination FPC. It makes forwarding decisions, distributes data cells throughout memory, processes exception and control packets, monitors system components, and controls FPC resets. There are different names for this component on various platforms:

•M7i/M10i Compact Forwarding Engine Board

•M20 System and Switch Board

•M40e/M160 Switching and Forwarding Module

•M320 uses a distributed architecture, where the PFE is contained entirely within the FPC. Route lookup and packet processing occurs on the ingress PFE, and is then switched across the Switch Interface Board (switching fabric) to the egress PFE for final route lookup and packet processing. The feature-rich programmable ASICs deliver a comprehensive, hardware-based system for packet processing and support uncompromising 40 Gbps performance per PFE. To ensure a non-blocking forwarding path, all channels between the ASICs and between ingress and egress PFEs are oversized, dedicated paths.

•The feature-rich programmable ASICs deliver a comprehensive, hardware-based system for packet processing. To ensure a non- blocking forwarding path, all channels between the ASICs are oversized, dedicated paths.

•The Routing Engine maintains the routing tables and controls the routing protocols, as well as the JUNOS software processes that control the router's interfaces, the chassis components, system management, and user access to the router

•The Routing Engine processes all routing protocol updates from the network, so forwarding performance is not affected.

•The Routing Engine implements each routing protocol with a complete set of Internet features and provides full flexibility for advertising, filtering, and modifying routes. Routing policies are set according to route parameters, such as prefixes, prefix lengths, and BGP attributes.

“Cable & Wireless will provision new IP capabilities over both dedicated high-speed access lines and lower speed

consumer broadband services using Juniper Networks MPLS- based infrastructure. The delivery of multiple, concurrent IP services will have a positive impact on our total cost of

ownership and ultimately simplify our network operations.

Juniper Networks M-series infrastructure“ will intelligently speed IP traffic through our network.

Phil Green

Senior Vice President, Global Operations

Cable & Wireless