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PTX3000 System Overview

PTX3000 Description

The Juniper Networks PTX3000 Packet Transport Router is designed for large networks and network applications, such as those supported by ISPs and high-volume content providers.

Benefits of the PTX3000 Router

  • Increased scalability—The PTX3000 scales to 8 Tbps in a single chassis, supporting up to 768 10-Gigabit Ethernet interfaces, 192 40-Gigabit Ethernet interfaces, and 80 100-Gigabit Ethernet interfaces, giving service providers the performance and scalability needed as networks grow. The purpose-built ASICs in the PTX3000 provide enhanced packet processing for both full IP functionality and MPLS transport, accommodating scale as traffic continues to increase and optimizing IP/MPLS transit functionality.

  • Space efficiency—The compact form-factor of the PTX3000 meets ETSI 300 mm standards, thus meeting installation requirements for colocations, central offices, and regional networks in emerging markets and transport-focused environments.

  • Always-on infrastructure base—The PTX3000 is engineered with full hardware redundancy for cooling, power, switch fabric, and host subsystems—either the Routing Engines and Control Boards or the Routing and Control Boards (RCBs) and RCB companion cards—allowing service providers to meet stringent service-level agreements across the core.

  • Nondisruptive software upgrades—The Junos operating system on the PTX3000 supports high availability (HA) features such as graceful Routing Engine switchover (GRES), nonstop active routing (NSR), and unified in-service software upgrade (unified ISSU), providing software upgrades and changes without disrupting network traffic.

  • Integrated deployment of optical and IP/MPLS—The optical transport options provided by the PTX3000 allow service providers to deploy a single router rather than deploying optical equipment and IP/MPLS routers separately, reducing network management requirements and operational complexities.

System Overview

The PTX3000 router occupies 22 rack units (22 U) and accommodates up to eight Flexible PIC Concentrators (FPCs), each of which supports one PIC. The PTX3000 also accommodates up to 16 integrated photonic line cards (IPLC base modules) or up to 8 base modules and 8 expansion modules. The IPLCs are installed in any of the FPC or PIC slots.

A PTX3000 with SIB-SFF-PTX-240 Switch Interface Boards (SIBs) and first-generation FPCs (FPC-SFF-PTX-P1 and FPC-SFF-PTX-T) provides up to 1.9 Tbps, full duplex (3.8 Tbps of any-to-any, nonblocking, half-duplex) switching. A PTX3000 with SIB3-SFF-PTX SIBs and third-generation FPCs (FPC3-SFF-PTX) provides up to 8 Tbps, full-duplex (16 Tbps of any-to-any, nonblocking, half-duplex) switching.

The system architecture cleanly separates control operations from packet forwarding operations. This design eliminates processing and traffic bottlenecks, permitting the PTX3000 to achieve high performance.

  • Control operations are performed by the host subsystem, which runs Junos OS to handle routing protocols, traffic engineering, policy, policing, monitoring, and configuration management.

  • Forwarding operations are performed by the Packet Forwarding Engines, which consist of hardware, including ASICs, designed by Juniper Networks. The ASICs are a definitive part of the hardware design, and enable the PTX3000 to achieve data forwarding rates that match current fiber-optic capacity.

Figure 1 and Figure 2 illustrate the front and rear of the PTX3000. Figure 3 shows the FPC and PIC slots.

Figure 1: Front View of the PTX3000Front View of the PTX3000
  1

Upper fan tray

  9

Routing Engine or RCB companion card

  2

Upper cable management system

10

Control Board or RCB

  3

Routing Engine or Routing and Control Board (RCB) companion card

11

Lower card-cage FPC slots 8, 10, 12, and 14 and PIC slots 9, 11, 13, and 15. See Figure 3. The IPLCs are installed in any of the FPC or PIC slots.

  4

Control Board or Routing and Control Board (RCB)

12

Lower cable management system

  5

Upper card-cage FPC slots 0, 2, 4, and 6 and PIC slots 1, 3, 5, and 7. See Figure 3. The IPLCs are installed in any of the FPC or PIC slots.

13

Lower fan tray

  6

Air filter (intake)

14

Power cable management system

  7

Craft interface

15

Power supply modules

  8

Switch Interface Boards

 
Figure 2: Rear View of the PTX3000Rear View of the PTX3000
  1

Upper air exhaust

  2

Lower air exhaust

Figure 3: FPC and PIC SlotsFPC and PIC Slots
Note:

The IPLCs are installed in any of the FPC or PIC slots.

PTX3000 System Architecture Description

The PTX3000 has two main architectural components:

  • Routing Engine—One or more Routing Engines provide Layer 3 routing services and network management.

    Note:

    The Routing and Control Board (RCB) provides Routing Engine and Control Board functionality in a single FRU.

  • Packet Forwarding Engines—These high-performance, ASIC-based components provide packet forwarding, route lookups, and Layer 2 and Layer 3 packet switching. See PTX3000 Packet Forwarding Engine Architecture for more information.

The Routing Engines and the Packet Forwarding Engines perform their primary tasks independently, but communicate through multiple links. This arrangement streamlines forwarding and routing control and runs Internet-scale backbone networks at high speeds.

PTX3000 Packet Forwarding Engine Architecture

The Packet Forwarding Engines provide packet switching, forwarding, and route lookup functions.

The Packet Forwarding Engines are implemented in ASICs that are physically located on the FPCs. The Packet Forwarding Engine architecture differs depending on which generation of FPCs and SIBs is installed in the PTX3000.

Packet Forwarding Engine Architecture with SIB-SFF-PTX-240 SIBs Installed

The SIB-SFF-PTX-240 SIBs support only first-generation FPCs (FPC-SFF-PTX-P1 and FPC-SFF-PTX-T).

Each first-generation FPC contains two Packet Forwarding Engines consisting of the following components:

  • Lookup ASICs, which provide the route lookup function, control functions, Layer 2 and Layer 3 encapsulation and de-encapsulation, and manage the division and reassembly of packets within the PTX3000.

  • Queuing and Memory Interface ASICs, which manage the buffering of data cells in memory and the queuing of notifications.

The fabric ASICs located on the SIB-SFF-PTX-240 SIBs act upon the fabric headers added by the Packet Forwarding Engine ASICs and manage the flow of data cells across the switch fabric.

Note:

There is no second-generation FPC for the PTX3000.

Packet Forwarding Engine Architecture with SIB3-SFF-PTX SIBs Installed

The SIB3-SFF-PTX SIBs support the existing Packet Forwarding Engine architecture in the FPC-SFF-PTX-P1 FPC, and enable additional functionality by using the Packet Forwarding Engine architecture in third-generation FPCs (FPC3-SFF-PTX).

Each third-generation FPC contains two Packet Forwarding Engine ASICs that combine the functionality of first-generation Lookup and Queuing and Memory Interface ASICs to provide the route lookup function, control functions, and encapsulation and de-encapsulation; manage the division and reassembly of packets within the PTX3000; and manage packet buffering and queuing.

The Packet Forwarding Engine ASICs are supported by Hybrid Memory Cubes (HMCs), which are high-efficiency memory modules that provide an external memory interface for the Packet Forwarding Engine ASICs and support the buffering of data cells and virtual output queues (VOQs) for class of service (CoS).

The fabric ASICs located on the SIB3-SFF-PTX SIBs act upon the fabric headers added by the Packet Forwarding Engine ASICs and manage the flow of data cells across the switch fabric.

In addition to increased bandwidth and improvements to infrastructure features, the third-generation packet forwarding architecture also provides other improvements including enhancements to core IP routing and peering features, enhancements to label-switching router (LSR) features, and enhancements to label-edge router (LER) features. Some features are activated only when the enhanced-mode statement is configured at the [edit chassis network-services] hierarchy level.

Note:
  • By default, the enhanced-mode statement is disabled.

  • After you configure the enhanced-mode statement and commit the configuration, you must reboot the router.

  • If the enhanced-mode statement is configured, only third-generation FPCs are powered on. Other FPCs cannot be brought online.

  • If the enhanced-mode statement is not configured, third-generation FPCs do not support advanced features.

PTX3000 Hardware Component Overview

The PTX3000 supports the components in Table 1 listed in alphabetic order.

Table 1: PTX3000 Hardware Components

Component

Spare Model Number

Hardware Label

CLI Output

Description

Air filter

FLTR-SFF-PTX-S

PTX3000 Cooling System Description

Backplane

Backplane

PTX3000 Backplane Description

Cable management system

PTX3000 Cable Management System

Chassis

CHAS-MP-PTX3000-S

PTX3000

PTX3000 Chassis Description

Control Board

CB-SFF-PTX-S

CB-SFF-PTX

Control Board

PTX3000 Control Board Description

Craft interface

FPD-SFF-PTX-S

Front Panel Display

PTX3000 Craft Interface Description

Fan tray

FAN-SFF-PTX-S

FAN-SFF-PTX

Fan Tray

PTX3000 Cable Management System

FPC

FPC-SFF-PTX-P1-A

FPC-SFF-PTX-P1

FPC

PTX3000 FPC Description

FPC-SFF-PTX-T

FPC-SFF-PTX-T

FPC-T

FPC3-SFF-PTX

FPC3-SFF-PTX-U1

FPC3-SFF-PTX-1X

SFF-SLOT-BLNK

Note:

This blank panel is also used to cover empty FPC and PIC slots.

Front doors

PTX3000-DOOR-S

Note:

See Installing the Front Doors on a PTX3000 for information about installing the front doors on the chassis.

PIC

See the PTX Series Interface Module Reference for information about the PICs supported on the PTX3000.

PTX3000 PIC Description

IPLC

PTX-IPLC-B-32

PTX-IPLC-B-32

OPT3-SFF-PTX

PTX3000 IPLC Description

PTX-IPLC-E-32

PTX-IPLC-E-32

PTX3000 IPLC Description

Power supply modules

PSM-SFF-PTX-DC-S

DC 12V Power Supply

PTX3000 Power System Description

Note:

See PTX3000 DC Power Cable and Lugs Specifications and PTX3000 AC Power Cord Specifications for information about supported power cables and cords.

PSM-SFF-PTX-AC-S

AC 12V Power Supply

SFF-PSM-BLNK

Routing Engine

RE-DUO-C2600-16G-S

RE-DUO-2600

PTX3000 Routing Engine Description

Routing and Control Board (RCB)

RCB-PTX-X6-32G

RCBPTX

RE-PTX-2X00x6

PTX3000 Routing and Control Board Description

RCB companion card

RCB-CC

RCB-CC

PTX3K CMPN RCB

PTX3000 Routing and Control Board Companion Card Description

Shipping container

PKG-PTX3000-S

Note:

See Packing the PTX3000 for Shipment for information about using the shipping container to ship the PTX3000.

Switch Interface Board (SIB)

SIB-SFF-PTX-240-S

SIB-SFF-PTX-240

SIB

PTX3000 Switch Interface Board Description

SIB3-SFF-PTX-S

SIB3-SFF-PTX

SIB3-SFF-PTX

PTX3000 Component Redundancy

The PTX3000 is designed so that no single point of failure can cause the entire system to fail. The following major hardware components are redundant:

  • Switch Interface Boards (SIBs)—The PTX3000 has nine SIBs. All nine SIBs are active and can sustain full throughput rate. The fabric plane can tolerate one SIB failure without any loss of performance. See PTX3000 Switch Interface Board Description.

  • Host subsystem—The host subsystem consists of either a Routing Engine functioning together with a Control Board, or a Routing and Control Board (RCB) and RCB companion card. Depending on your configuration, each host subsystem requires the following components to operate:

    • A Routing Engine installed in a slot adjacent to the Control Board

    • An RCB companion card installed in a slot adjacent to the RCB

    The PTX3000 can have one or two host subsystems. If two host subsystems are installed, one functions as the primary and the other functions as the backup. If the primary host subsystem (or either of its components) fails, the backup can take over as the primary. See PTX3000 Host Subsystem Description.

    Note:

    The primary and backup host subsystems must be the same type during normal operation. For example, if the primary host subsystem is an RCB with RCB companion card, the backup host subsystem must also be an RCB with RCB companion card.

    If the Routing Engines or RCBs are configured for nonstop active routing (NSR), the backup Routing Engine or RCB automatically synchronizes its configuration and state with the primary Routing Engine or RCB. Any update to the primary Routing Engine or RCB state is replicated on the backup Routing Engine or RCB. If the backup Routing Engine or RCB assumes primary role, packet forwarding continues through the PTX3000 without interruption. For more information about NSR, see the High Availability User Guide.

  • Power system—The PTX3000 has five power supply module (PSM) slots. PSM redundancy varies depending on the number of PSMs and the number of FPCs. See the PTX3000 Power System Description for more information about power system redundancy.

  • Cooling system—The cooling system has redundant components, which are controlled by the host subsystem. If one of the fans fails, the host subsystem increases the speed of the remaining fans to provide sufficient cooling for the PTX3000 indefinitely. See PTX3000 Cooling System Description.

PTX3000 Field-Replaceable Units

Field-replaceable units (FRUs) are PTX3000 components that can be replaced at the customer site. Replacing most FRUs requires minimal PTX3000 downtime.

  • Hot-removable and hot-insertable FRUs—You can remove and replace these components without powering off the PTX3000 or disrupting the routing functions.

  • Hot-pluggable FRUs—You can remove and replace these components without powering off the PTX3000, but the routing functions of the system are interrupted when the component is removed.

  • Other FRUs require that you power off the Routing Engine or Routing and Control Board (RCB).

Table 2 lists the FRUs for the PTX3000.

Table 2: Field-Replaceable Units

Component

Effect of Replacement

For More Information

Air filter

Hot-removable and hot-insertable

Replacing a PTX3000 Chassis Air Filter

Craft interface

Hot-removable and hot-insertable

Replacing a PTX3000 Craft Interface

Backup Control Boards

Primary Control Boards if nonstop active routing is configured

Hot-removable and hot-insertable

Replacing a PTX3000 Control Board

Primary Control Board if nonstop active routing is not configured

Nonredundant Control Board

Hot-pluggable

Fan trays

Hot-removable and hot-insertable

Flexible PIC Concentrators (FPCs)

Hot-removable and hot-insertable

Replacing a PTX3000 FPC

PICs

Hot-removable and hot-insertable

Replacing a PTX3000 PIC

Integrated photonic line cards (IPLCs)

Hot-removable and hot-insertable

Replacing a PTX3000 PIC

Power supply modules (PSMs)

Hot-removable and hot-insertable

Backup Routing Engine

Primary Routing Engine if nonstop active routing is configured

Hot-removable and hot-insertable

Replacing a PTX3000 C2600 Routing Engine

Primary Routing Engine if nonstop active routing is not configured

Nonredundant Routing Engine

Hot-pluggable

Backup RCB

Primary RCB if nonstop active routing is configured

Hot-removable and hot-insertable

Replacing the PTX3000 RCB

Primary RCB if nonstop active routing is not configured

Nonredundant RCB

Hot-pluggable

Backup RCB companion card

Primary RCB companion card if nonstop active routing is configured

Nonredundant RCB companion card

Hot-removable and hot-insertable

Replacing the PTX3000 RCB Companion Card

Primary RCB companion card if nonstop active routing is not configured

Hot-pluggable

CompactFlash card in a Routing Engine

Power off the Routing Engine

Replacing a CompactFlash Card in a PTX3000 Routing Engine

Solid-state drive (SSD) in a Routing Engine

Power off the Routing Engine

Replacing a Solid-State Drive in a PTX3000 Routing Engine

Solid-state drive (SSD) in an RCB

Power off the RCB

Replacing the SSD Cards in the PTX3000 RCB

Switch Interface Boards (SIBs) if at least eight other SIBs are operational

Hot-removable and hot-insertable

Replacing a PTX3000 Switch Interface Board

SIBs if fewer than eight SIBs are operational

Hot-pluggable