Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Enhanced Router System Description
Route Processor
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Table of Contents

Route Processor

Route Processor Overview

Active and Standby Arbitration

RP Card to Fabric Module Queuing

Distributed Route Processor

DRP Card

DRP PLIM

Limitations and Restrictions

Performance Route Processor

Performance Route Processor Front Panel

Performance Route Processor Overview

Performance Route Processor Memory Options

Initiate OIR Pushbutton

Control and Management Ports

Console and Aux Ports

Service Ethernet Port

USB Port

Route Processor

This chapter describes the route processor (RP) card of the Cisco CRS 8-slot Line Card Chassis Enhanced router. It contains the following topics:

Route Processor Overview

The route processor (RP) card is the system controller for the Cisco CRS 8-slot Line Card Chassis Enhanced router. It performs route processing and distributes forwarding tables to the MSCs. The RP provides a control path to each MSC, performs system-monitoring functions, and contains hard disks for system and error logging.

Although the routing system contains two RP cards, only one RP is active at a time. The other RP operates in standby mode, ready to assume control if the active RP fails. See the “Active and Standby Arbitration” section for information on how the system determines which RP is active and which is standby.

The RP card provides route processing, alarm, fan and power supply controller function in the Cisco CRS 8-slot Line Card Chassis Enhanced router. The RP card controls fans, alarms, and power supplies through the use of an i2c communication link from the RP card to each fan tray/power supply.

Two RP cards are required per chassis for redundancy—one is active , and the other is standby . An RP card can be inserted in either of the two dedicated slots in the chassis.

Figure 6-1 illustrates the route processor card.

Figure 6-1 Route Processor Card

 

Details on the faceplate of the RP card are shown in Figure 6-2 and are described in Table 6-1 . Configuration is explained in detail in the Cisco IOS XR Getting Started Guide , available online at:

http://www.cisco.com/en/US/products/ps5763/products_getting_started_guide_book09186a00803a5d2a.html

Figure 6-2 Details on the Front Panel of the Route Processor Card

 

 

Table 6-1 Description of RP Card Components

RP Card Component
Description

Hard drive

An IDE hard drive is used to gather debugging information, such as core dumps from the RP or MSCs. It is typically powered down and activated only when there is a need to store data.

Memory

Memory resides in a SIMM module on the RP card. The RP can be configured with 2 or 4 GB of memory.

PCMCIA Subsystems

Two PCMCIA flash slots provide support for 2Gb and 4Gb of flash subsystem storage, each. One of the PCMCIA flash subsystems is accessible externally and removable, and allows you to transfer images and configurations by plugging in a PCMCIA flash card. The other PCMCIA flash subsystem is fixed to the RP, for permanent storage of configurations and images.

Dual-processing CPU

A dual-processing CPU symmetric multiprocessor (SMP) performs route processing. The CPU also serves as the MSC service processor (SP), and monitors the RP temperature, voltages, power supply margining (during factory test), and ID EEPROM.

SFP modules

Two small form-factor pluggable (SFP) modules support external Gigabit Ethernet connections for multi-chassis systems.

RJ45 Ethernet port

An RJ45 10/100/1000 copper Ethernet port is available for providing connectivity to network management systems.

Fast Ethernet Midplane Connector

Internal 100 Mbps Fast Ethernet (FE) midplane connections connect each MSC in the chassis to both RP cards. These FE connections are traces in the midplane. There are also FE connections to the fans power supplies. These connections all form part of the control plane.

Active and Standby Arbitration

The two RP cards in a Cisco CRS 8-Slot Line Card Chassis Enhanced router operate in an active-standby relationship. The routing system performs the following steps to determine which RP is active and which is standby:

1. At chassis power-up, each RP boots its board components and runs self-tests.

2. The RP cards exchange messages with each other and with the service processors (SPs) on all other boards. Each RP examines its outgoing “Reset” lines to verify that they are inactive.

3. Based on the results of its self-test, each RP decides whether it is ready to become master (active). If so, the RP asserts the “Ready” signal to its on-board arbitration unit, which propagates the “Ready” signal to the other RP.

4. The arbitration hardware chooses the active RP and asserts an “Active” signal to the chosen RP, along with an interrupt. The hardware also propagates the “Active” signal to the other RP, along with an interrupt.

5. Software on each RP reads its “Active” signal, and branches accordingly to “Primary” or “Standby” code.

6. If the active RP is removed, powered down, or voluntarily de-asserts its “Ready” signal, the standby RP immediately receives an asserted “Active” signal, along with an interrupt.

RP Card to Fabric Module Queuing

The RP card mates with the Cisco CRS 8-Slot Line Card Chassis Enhanced router midplane (see Figure 6-3). The RP connects to the switch fabric through two fabric interface modules (From fabric and To fabric) that are similar to the fabric interface of the MSC (see the “MSC To Fabric Section Queuing” section).

  • The “From fabric” module (on the RP receive path) queues the data from the switch fabric and reorders and reassembles the cells into packets before queuing them for slow-path processing.
  • The “To fabric” module (on the RP transmit path) queues the packets and segments them into cells before transmitting them to the switch fabric.

Figure 6-3 Route Processor Architecture Diagram

 

Distributed Route Processor

The distributed route processor (DRP) card and its associated physical layer interface module (PLIM) provide additional routing capabilities for the Cisco CRS 8-slot Line Card Chassis Enhanced router. The DRP and DRP PLIM function as an additional route processor (RP) in the system.

A DRP runs any of the routing processes that run on the RP (for example, BGP, OSPF, IS-IS, MPLS, LDP, IP multicast, and so on). You issue software commands to specify which processes are to run on the DRP instead of the RP. This action of assigning processes to a DRP is called process placement . By offloading processor-intensive routing tasks (such as BGP speakers and IS-IS) from the RP to the DRP, you can improve system performance.


Note The distributed route processor (DRP) card and DRP PLIM have no dedicated slots. The DRP card is installed in an open MSC slot and the DRP PLIM is installed in a corresponding PLIM slot.


The DRP does not perform any of the control and management functions performed by the RP; therefore, it can never be the designated shelf controller (DSC) in a multishelf system. However, the DRP can be configured as the designated logical router shelf controller (dLRSC) in a logical router. A logical router is a part of the Cisco CRS routing system that functions as a complete router, running its own routing protocols and forwarding IP packets between its interfaces.


Note Currently, the Cisco CRS 8-slot Line Card Chassis Enhanced router can function as a single logical router only.


See the “Limitations and Restrictions” section for information about the limitations of the DRP that apply to this release.

The following sections describe the DRP card and the DRP PLIM. Throughout these sections, unless otherwise noted, DRP refers to both the DRP and its associated PLIM.

DRP Card

The DRP card (CRS-DRP) is an optional component that enhances Cisco CRS 8-slot Line Card Chassis Enhanced router routing capabilities by serving as an additional route processor in the system. The DRP can be installed in any MSC (line card) slot in the line card chassis. The corresponding DRP PLIM is installed in the corresponding PLIM slot. The cards are connected to each other through the chassis midplane.

The main components of the DRP are:

  • Two symmetric processors (SMP0 and SMP1)—Perform route processing tasks. The SMPs are independent of each other and operate simultaneously. You can assign routing processes, which normally run on the RP, to run on the DRP instead.
  • The SMPs are not connected to each other internally, but they can communicate with each other through the routing system switch fabric or Ethernet control plane. Service processor module—Communicates with the RP (which is the system controller), controls DRP processes, and monitors voltages and temperatures on the DRP and DRP PLIM.
  • Two CPUCTRL ASICs—Provide an interface between the SMPs and the switch fabric ASICs. Each ASIC has a set of eight ingress and egress queues for buffering data.
  • Several switch fabric ASICs—Provide the interface to and from the switch fabric:

Two FabricQ ASICs—Receive cells from the switch fabric, reorder the cells and reassemble them into packets, and queue the packets for transmission to the CPUCTRL ASICs. The FabricQ ASICs are part of the Rx path on the DRP. Each FabricQ ASIC is connected to a different CPUCTRL ASIC.

IngressQ ASIC—Receives data packets from the SMP, segments the packets into cells, and distributes the cells to the switch fabric. The ASIC is part of the Tx path on the DRP. The module has connections to both SMPs, but only one SMP controls the IngressQ ASIC at any time. By default, SMP0 controls the ASIC at startup.

The IngressQ ASIC has a memory buffer for storing packets. This buffer storage provides input rate-shaping queues for shaping switch-bound traffic. Input rate shaping is used to provide bandwidth and QoS guarantees for physical and logical port traffic and to smooth traffic bursts into the switch fabric.

Two Qlink modules—Provide the interface to the switch fabric. The modules convert data between the format used by the FabricQ and IngressQ ASICs and the format used by the switch fabric. Each Qlink module provides an interface to four planes of the switch fabric.

  • Several interfaces—Provide communications paths among the components on the DRP.
  • Additional components—Include power and clocking components, voltage and temperature sensors, and an identification EEPROM that stores initial configuration and hardware information.

Figure 6-4 shows the DRP card front panel.

Figure 6-4 DRP Card Front Panel

 

 

1

STATUS LED

2

PRIMARY LED

The DRP front panel contains:

  • Primary LED—When two DRP cards are configured as a redundant pair, the LED turns green to indicate that this DRP is currently active. The other DRP is in standby mode; it takes over DRP processing if the active DRP card fails.
  • Status LED—Green indicates that the card is operating correctly. Yellow indicates that there is a problem with the card.

The Console, Aux, and Ethernet management ports for the DRP card are located on the DRP PLIM. (See Figure 6-5.)

  • The DRP card power consumption—371 W

DRP PLIM

The DRP PLIM, or DRP front-access panel (CRS-DRP-ACC), provides access to the DRP card for configuration and system management. The DRP PLIM contains the CONSOLE, AUX, and Ethernet management ports (MGMT ETH) for the DRP and an alphanumeric LED that shows operational status.

The DRP PLIM is installed in the PLIM slot that corresponds to the MSC slot in which the associated DRP card is installed.

Figure 6-5 shows the front panel of the DRP PLIM.

Figure 6-5 DRP PLIM Front Panel

 

 

1

CONSOLE port 0

7

PRIMARY LED

2

CONSOLE port 1

8

PC card 1

3

PC Card 0

9

Hard drive 1

4

Alphanumeric LED

10

Hard drive 0

5

Alphanumeric LED

11

MGMT ETH port 1

6

STATUS LED

12

MGMT ETH port 0

The DRP PLIM front panel contains the following components:

  • CONSOLE and AUX ports (one set of ports for each SMP)—Provide RJ-45 serial interfaces for local and remote (modem) console terminal connections.
  • Management Ethernet ports (one port for each SMP)—Provide a 10/100/1000 Ethernet interface for configuration and management (RJ-45 connector).
  • Two 40-gigabyte removable hard disk drives (one for each SMP)—Store troubleshooting and debugging information.
  • Two PCMCIA flash disk slots (one for each SMP)—Accept a 1-gigabyte PCMCIA flash card for storing software images.
  • Alphanumeric LED (eight-digit display)—Indicates the status of the DRP and DRP PLIM cards.
  • DRP PLIM power consumption—20 W

Limitations and Restrictions

The current Cisco CRS 8-slot Line Card Chassis Enhanced router multishelf system supports DRP functionality, with the following limitations:

  • Each line card chassis supports one DRP and one DRP PLIM. In the future, each line card chassis will support up to eight DRPs and eight DRP PLIMs.
  • Redundant DRP operation (or DRP pairing ) is currently not supported. In the future, you will be able to install a pair of DRPs in the chassis and configure them for high availability. When paired, the DRPs operate in active and standby mode. Only one DRP is active at a time, while the other DRP functions in standby mode, ready to take over processing if the active DRP fails.
  • For processes to run on the DRP, you must override the default process placement policy and configure the processes to run on a single (unpaired) DRP. This reconfiguration is necessary because the default placement policy assigns processes to paired DRPs only.

Performance Route Processor


Note For the Cisco CRS-X, the PRP is required instead of the RP.


The Performance Route Processor (PRP) is also available for the Cisco CRS 8-slot Line Card Chassis Enhanced router. The PRP provides enhanced performance for both route processing and system controller functionality.

Two PRP cards are required per chassis for a redundant system. The PRP can be inserted in either of the two dedicated RP slots in the Cisco CRS 8-slot Line Card Chassis Enhanced router. When two PRPs are installed, one PRP is the “Active” RP and the other is the “Standby” RP.

Figure Figure 6-6 shows the PRP card.

Figure 6-6 Performance Route Processor

 

The PRP has the following physical characteristics:

  • Height—20.6 in. (52.3 cm)
  • Depth—11.2 in. (28.5 cm)
  • Width—1.8 in. (4.6 cm)
  • Weight—9.60 lb (4.35 kg)
  • Power consumption—175 W (with two SFP or SFP+ optics modules)

Performance Route Processor Front Panel

The PRP front panel includes:

  • Two 1GE (SFP) or 10G (SFP+) ports for 1-GE or 10-GE uplinks
  • Service Ethernet RJ45 port
  • Console port
  • Auxiliary port
  • Push button switch to Initiate OIR process
  • LED to indicate OIR status and readiness for extraction
  • Alphanumeric Display
  • LEDs for card status and RP Active or Standby status
  • USB socket

Figure 6-7 shows the front panel of the PRP card.

Figure 6-7 Performance Route Processor Front Panel

 

 

1

BITS 0

12

Control Ethernet 1 port (SFP or SFP+)

2

BITS 1

13

Link/Active 1 LED

3

DTI 0

14

OIR push button—Press to initiate OIR process

4

DTI 1

15

OIR Ready LED

5

Management Ethernet RJ45 port

16

USB socket

6

Alarm connector

17

Service Ethernet RJ45 port

7

Critical Alarm LED

18

Console port

8

Major Alarm LED

19

Auxiliary port

9

Minor Alarm LED

20

Alphanumeric LED Display

10

Control Ethernet 0 port (SFP or SFP+)

21

PRIMARY LED—PRP active or standby indicator

11

Link/Active 0 LED

22

STATUS LED—Card status indicator

Performance Route Processor Overview

The CRS PRP for the Cisco CRS 8-slot Line Card Chassis Enhanced router is a next generation Intel-based RP that increases the CPU compute power, memory and storage capacity. The PRP provides both route processing and system controller functionality for enhanced performance.

A CPU interface and system control ASIC provides resources and communication paths between the CPU and the rest of the system to provide line card management, configuration, monitoring, protocol control, and exception packet handling. The fabric queuing portion of this ASIC acts as the fabric interface to handle the traffic to the fabric. Traffic from the fabric is handled by the ingress queuing portion of an interface bridging FPGA.


Note A chassis may not be populated with a mix of RP and PRP cards. Both route processor cards should be of the same type (RP or PRP).


Figure 6-8 shows a block diagram of the PRP card.

Figure 6-8 Performance Route Processor Block Diagram

 

Performance Route Processor Memory Options

The following memory configurations are supported by the CPU memory controller:

  • Three 2GB DDR3 DIMMs, for a total of 6GB (Cisco product ID: CRS-8-PRP-6G)
  • Three 4GB DDR3 DIMMs, for a total of 12GB (Cisco product ID: CRS-8-PRP-12G)

Note The memory on the 6GB PRP is not upgradable to 12GB.


Initiate OIR Pushbutton

The PRP front panel includes an OIR pushbutton (see item 1 in Figure 6-7). Pressing the OIR button initiates the OIR process and avoids the loss of card information caused by a surprise extraction.

If a card is extracted without initiating the OIR process (surprise extraction), the saving of logs or other important information is not possible. Although surprise extraction is supported, using the OIR process allows you to save important card information and logs.

After pressing the button, the OIR Ready LED (item 2 in Figure 6-7) blinks during the OIR process. When the OIR process is complete, the OIR Ready LED glows solidly to indicate that the board is ready for extraction.

If for some reason the OIR process cannot be completed, the OIR Ready LED will continue blinking. If this occurs, you should check the log and console messages for a failure reason.

If the card is not removed within five minutes, the PRP resets itself and the OIR Ready LED will stop glowing.

The OIR process operates as described even if the PRP is not in a redundant configuration or if the standby PRP is not ready.

Control and Management Ports

Two Control Ethernet optical ports (CNTL ETH 0, CNTL ETH 1) provide connectivity to network control systems. These ports use small form-factor pluggable (SFP or SFP+) modules to provide external Gigabit Ethernet (GE) or 10-Gigabit Ethernet (10-GE) connections.

A Management RJ45 port (MGMT ETH) provides connectivity to network management systems.

Console and Aux Ports

Table 6-2 lists the pinouts for the Console (CON) and Auxiliary (AUX) RJ45 ports on the PRP (items 4 and 5 in Figure 6-7).

 

Table 6-2 PRP Console Port and Aux Port Pinouts

Pin
Console Port
Aux Port

1

Request to send (RTS)

Request to send (RTS)

2

Data terminal ready (DTR)

Data terminal ready (DTR)

3

Transmit data (TxD)

Transmit data (TxD)

4

EMI Filter Ground (Gnd Console)

EMI Filter Ground (Gnd Aux)

5

EMI Filter Ground (Gnd Console)

EMI Filter Ground (Gnd Aux)

6

Receive data (RxD)

Receive data (RxD)

7

Carrier detect (CD)

Carrier detect (CD)

8

Clear to send (CTS)

Clear to send (CTS)

Service Ethernet Port

PRP functions include a Service Ethernet feature that enhances serviceability and troubleshooting of the system. The Service Ethernet RJ45 port provides a back door mechanism into the PRP if the main CPU subsystem is stuck and cannot be recovered.

Through the Service Ethernet connection, you can perform the follow functions:

  • Reset any cards in the chassis, including the local PRP
  • Perform console attachment to other CPUs to support console tunneling in the chassis
  • Dump memory or device registers on the PRP

USB Port

The PRP has an external USB port on the faceplate for connecting a USB 2.0 thumb flash drive. The external devices connected to this port can be used for logging, external file transfer, and installing software packages.