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This chapter describes the system planning considerations for your Cisco CRS Carrier Routing System 16-Slot Line Card Chassis installation. It includes the following sections:
Following is a list of tasks to configure the line card chassis for high availability, which helps to ensure that service is not disrupted due to failures:
To provide more high availability, 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.
See the following sections for information about the power redundancy features of the Cisco CRS 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.
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.
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. In the modular configuration power system, all power modules power all chassis load zones, as long as the circuit breaker is not tripped. In the fixed configuration power system, 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 in a fixed configuration power system 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.
Note | To avoid network connectivity disruption because of a double-fault power failure, you should carefully consider the best placement of cards in the chassis. See the Line Card Chassis Load Zones and Card Placement for High Availability for information about how to install cards to avoid a disruption in service. |
Figure 1 shows the load zones on the front (PLIM) and rear (MSC) side of the line card chassis.
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 when a fixed configuration power system is installed. The figure below shows the load zones on the front and rear of the chassis with a fixed configuration power system installed.
To avoid service disruption because of a double-fault power failure in the line card chassis, consider the following to determine how to install modular services cards (MSCs), forwarding processor (FPs), and physical layer interface modules (PLIMs) in the chassis:
The table below 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.)
Load Zone |
Slot |
Card Type 1 |
Card Connects to |
---|---|---|---|
1 |
0 |
4xOC-192 |
Core or Intra-POP |
1 |
16xOC-48 |
Edge |
|
2 |
1xOC-768 |
Intra-POP |
|
3 |
8x10-GE |
Edge |
|
3 |
4 |
1xOC-768 |
Core |
5 |
8x10-GE |
Edge |
|
6 |
4xOC-192 |
Edge |
|
7 |
16xOC-48 |
Edge |
|
4 |
8 |
1xOC-768 |
Core |
9 |
8x10-GE |
Edge |
|
10 |
4xOC-192 |
Edge |
|
11 |
16xOC-48 |
Edge |
|
6 |
12 |
4xOC-192 |
Core or Intra-POP |
13 |
16xOC-48 |
Edge |
|
14 |
1xOC-768 |
Intra-POP |
|
15 |
8x10-GE |
Edge |
The Cisco CRS 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 routers. The DRP is installed in any MSC slot. The DRP PLIM is installed in the corresponding PLIM slot.
Before installing a Cisco CRS 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.
Note | The chapter Power and Cooling Requirements provides detailed power and cooling requirements. |
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.
You must provide the line card- PLIM interface cables and the cable management trays for these cables from the line card chassis to your facility interconnect.
Because the type and number of MSCs, FPs, and PLIMS 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:
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 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.
After a Cisco CRS routing system has been installed, it has to be tested and certified. Contact Cisco Customer Advocacy for information about testing, certification, and warranties.