Table Of Contents
System Planning Considerations
Planning for High Availability
Power Redundancy and Card Placement for High Availability
Redundant Power Systems and Chassis Load Zones
Line Card Chassis Load Zones and Card Placement for High Availability
Using DRPs and DRP PLIMs to Increase Routing Performance
Physical Layer Interface Module Cables
System Testing, Certification, and Warranty
Tools and Test Equipment Required for Installation
System Planning Considerations
This chapter describes the system planning considerations for your Cisco CRS-1 Carrier Routing System 16-Slot Line Card Chassis installation. It includes the following sections:
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Planning for High Availability
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Planning for High Availability
Following is a list of tasks you can consider doing to configure the line card chassis for high availability, which helps to ensure that service is not disrupted due to failures:
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To provide more high availability, you can also install each line card chassis in a different room, located in a different fire and power zone. This way, a problem in one room should not affect the operation of the other chassis.
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See the following sections for information about the power redundancy features of the Cisco CRS-1 routing system and information about how to install cards in the line card chassis to avoid the potential for service disruption during a power failure.
Power Redundancy and Card Placement for High Availability
This section describes the power redundancy features of the line card chassis. It describes the power load zones in the chassis and provides information about how to install cards to configure the chassis for high availability (so that a power failure does not disrupt system operation).
The first several sections that follow provide information that applies to all chassis. The remaining sections describe specific features and considerations for individual chassis.
Redundant Power Systems and Chassis Load Zones
Each chassis power shelf is connected to a separate and independent power source (2N power redundancy). During normal operation when both power sources are operational, both sets of power shelves and power modules function together to power the chassis. If a power sources fails, the other power source provides enough input power to power the chassis. This 2N power redundancy enables the chassis to operate despite the power failure.
In addition, chassis load zones distribute power throughout the chassis and provide redundant power to chassis slots. Each load zone is powered by a set of power modules (one module from each power shelf). In each set of power modules (A0 and B0, A1 and B1, and A2 and B2) each power module is considered a backup for the other. Each set of power modules provides power to the same set of chassis load zones. If either power module fails, the other continues to provide power to those slots.
Although it is rare, a double-fault power failure causes power to be lost to a load zone. A double-fault failure occurs when a power module and its backup module both fail. The failure results in all power being lost to a set of chassis slots, which means that the components or cards installed in those slots lose power and stop functioning until one of the failing power modules is replaced.
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Figure 5-1 shows the load zones on the front (PLIM) and rear (MSC) side of the line card chassis.
Line Card Chassis Load Zones and Card Placement for High Availability
This section describes the power load zones in the line card chassis and provides information about how to install cards in the chassis so that a double-fault power failure does not disrupt service. Figure 5-1 shows the load zones on the front and rear of the chassis.
Figure 5-1 Line Card Chassis Power Load Zones
To avoid service distribution due to a double-fault power failure in the line card chassis, consider the following to determine how to install modular services cards (MSCs) and physical layer interface modules (PLIMs) in the chassis:
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Table 5-1 shows an example of how you might install PLIMs in the line card chassis to avoid a single point of failure in the chassis. (This information is only an example. Your configuration may be different.)
Table 5-1 Line Card Chassis Card Placement for High Availability
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0
4xOC-192
Core or Intra-POP
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16xOC-48
Edge
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1xOC-768
Intra-POP
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8x10-GE
Edge
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4
1xOC-768
Core
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8x10-GE
Edge
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4xOC-192
Edge
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16xOC-48
Edge
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8
1xOC-768
Core
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8x10-GE
Edge
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4xOC-192
Edge
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16xOC-48
Edge
6
12
4xOC-192
Core or Intra-POP
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16xOC-48
Edge
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1xOC-768
Intra-POP
15
8x10-GE
Edge
1 Any PLIM can be inserted in the card slot. These card types are listed as examples of possible PLIM types.
Using DRPs and DRP PLIMs to Increase Routing Performance
The Cisco CRS-1 distributed route processor (DRP) and its companion card (DRP PLIM) are optional components that can be installed in the line card chassis to provide enhanced routing capabilities for Cisco CRS-1 routers. The DRP is installed in any modular services card (MSC), or line card, slot. The DRP PLIM is installed in the corresponding PLIM slot.
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Power
Before installing a Cisco CRS-1 routing system, you must carefully plan the facility power required to support it. The power requirements are based on the number of line card chassis that you plan to install. When planning the power layout for a routing system, you should also include the power requirements of peripheral equipment (such as the external terminals), the network management equipment, and the test equipment you will use with your system.
For larger system configurations, it may be advisable to consult with a facilities electrical expert to understand the load that a routing system may put on the power plant of your facility. Always follow local electrical codes.
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Cable Management
As the size of the routing system increases, the cabling required for the chassis increases. For example, a fully loaded chassis has more cables connected to it than a partially loaded chassis.
The cabling runs must be carefully planned. The basic configurations for various routing systems should be arranged to minimize the complexity and length of the cable runs. Precut and terminated cables are considered part of the basic configuration.
Physical Layer Interface Module Cables
You must provide the modular services card (MSC) PLIM interface cables. You also provide the cable management trays for these cables from the line card chassis to your facility interconnect.
Because the type and number of MSC and physical layer interfaces vary with each routing system site, plan these data cable runs in advance of the system installation.
When planning the data cable runs, consider the:
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Noise Control
The line card chassis has built-in noise reduction, such as fan speed control. If the chassis is installed in an environment in which excessive noise could be harmful to personnel, some other noise-reduction options could be attempted. Passive noise reduction could include the installation of foam panels to insulate the surrounding area from the noise.
Additional noise-reduction measures have to be designed on an individual customer basis.
Cisco Installation Services
Cisco or a Cisco partner can provide a total installation, from planning to power up. For information about Cisco (or Cisco partner) installation services, contact Cisco Customer Advocacy.
System Testing, Certification, and Warranty
After a Cisco CRS-1 routing system has been installed, it has to be tested and certified. Contact Cisco Customer Advocacy for information about testing, certification, and warranties.
Tools and Test Equipment Required for Installation
The following tools are required to install the line card chassis:
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To bolt the chassis to the floor, you need:
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To attach the outrigger kit (CRS-16-LCC-ALTMNT=), you need the following tools. The kit is required when you cannot bolt the chassis to the floor at the preferred or secondary mounting-hole locations.
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To attach the cosmetics kit, you need the following tools:
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