user manual
Table Of Contents
- Cisco ASR 9000 Series Aggregation Services Router Overview and Reference Guide
- Preface
- Overview and Physical Description
- Chassis Physical Overview
- Cisco ASR 9010 Router
- Cisco ASR 9006 Router
- Cisco ASR 9904 Router
- Cisco ASR 9922 Router
- Cisco ASR 9912 Router
- Field Replaceable Units
- Rack-Mounting Considerations
- Chassis Slots
- Fiber and Interface Cable Management
- Routing of DC Power Tray Source Cables
- Slot Numbering and Marking
- Power Module Hardware and Software Identification
- Route Switch Processor and Route Processor Cards
- RSP Front Panel and Access Ports
- RP Front Panel and Access Ports
- Management Features
- Alarm Connector
- Serviceability
- RSP and RP Card Ejector Levers
- Fabric Controller Card
- FC Card Ejector Levers
- Ethernet Line Cards
- Line Card Front Panel and Access Ports
- Line Card Serviceability
- Line Card Ejector Levers
- Power System
- AC and DC Power Modules
- Cooling System
- Cooling Path
- Fan Trays
- Management and Configuration
- Line Card Front Panel and Access Ports
- Line Card Serviceability
- Line Card Ejector Levers
- Power System
- Functional Description
- Router Operation
- Route Switch Processor Card
- Route Processor Card
- Front Panel Connectors
- Management LAN Ports
- Console Port
- Auxiliary Port
- Alarm Out
- Synchronization Ports
- RP USB Port
- Front Panel Indicators
- LED Matrix Display
- LED Matrix Boot Stage and Runtime Display
- LED Matrix CAN Bus Controller Error Display
- Push Buttons
- Functional Description
- Switch Fabric
- Unicast Traffic
- Multicast Traffic
- Route Processor Functions
- Processor-to-Processor Communication
- Route Processor/Fabric Interconnect
- Fabric Controller Card
- FC Card Front Panel Indicator
- Ethernet Line Cards
- Functional Description
- 40-Port Gigabit Ethernet (40x1GE) Line Card
- 8-Port 10-Gigabit Ethernet (8x10GE) 2:1 Oversubscribed Line Card
- 4-Port 10-Gigabit Ethernet (4x10GE) Line Card
- 8-port 10-Gigabit Ethernet (8x10GE) 80-Gbps Line Rate Card
- 2-Port 10-Gigabit Ethernet + 20-port 1-Gigabit Ethernet (2x10GE + 20x1GE) Combination Line Card
- 16-port 10-Gigabit Ethernet (16x10GE) Oversubscribed Line Card
- 24-Port 10-Gigabit Ethernet Line Card
- 36-port 10-Gigabit Ethernet Line Card
- 2-port 100-Gigabit Ethernet Line Card
- 1-Port 100-Gigabit Ethernet Line Card
- Modular Line Cards
- 20-port Gigabit Ethernet Modular Port Adapter
- 8-port 10-Gigabit Ethernet Modular Port Adapter
- 4-Port 10-Gigabit Ethernet Modular Port Adapter
- 2-port 10-Gigabit Ethernet Modular Port Adapter
- 2-Port 40-Gigabit Ethernet Modular Port Adapter
- 1-Port 40-Gigabit Ethernet Modular Port Adapter
- Power System Functional Description
- Power Modules
- Power Module Status Indicators
- System Power Redundancy
- AC Power Trays
- AC Tray Power Switch
- AC Input Voltage Range
- DC Output Levels
- AC System Operation
- Power Up
- Power Down
- DC Power Trays
- DC Tray Power Switch
- DC Power Tray Rear Panel
- DC Power Tray Power Feed Indicator
- DC System Operation
- Power Up
- Power Down
- Cooling System Functional Description
- Cooling Path
- Fan Trays
- Cisco ASR 9010 Router Fan Trays
- Cisco ASR 9006 Router Fan Trays
- Cisco ASR 9904 Router Fan Tray
- Cisco ASR 9922 Router and Cisco ASR 9912 Router Fan Trays
- Status Indicators
- Fan Tray Servicing
- Slot Fillers
- Chassis Air Filter
- Speed Control
- Temperature Sensing and Monitoring
- Servicing
- System Shutdown
- System Management and Configuration
- Cisco IOS XR Software
- System Management Interfaces
- Command-Line Interface
- Craft Works Interface
- XML
- SNMP
- SNMP Agent
- MIBs
- Online Diagnostics
- High Availability and Redundant Operation
- Features Overview
- High Availability Router Operations
- Stateful Switchover
- Fabric Switchover
- Active/Standby Status Interpretation
- Non-Stop Forwarding
- Nonstop Routing
- Graceful Restart
- Process Restartability
- Fault Detection and Management
- Power Supply Redundancy
- AC Power Redundancy
- DC Power Redundancy
- Detection and Reporting of Power Problems
- Cooling System Redundancy
- Cooling Failure Alarm
- Technical Specifications
3-9
Cisco ASR 9000 Series Aggregation Services Router Overview and Reference Guide
OL-17501-09
Chapter 3 High Availability and Redundant Operation
Cooling System Redundancy
The Cisco ASR 9904 Router has a single fan tray located at the left side of the chassis and is accessible
from the rear. The fan tray has 12 fans arranged in three groups of four fans each. Two fans in each group
share a fan controller. The power supplied to the fan controller is 1:3 protected. A single fan failure has
no impact on air flow because the other eleven fans will compensate for it. If a fan controller fails, there
is a possibility of up to two fans failing; however, the design always has two fans operating to
compensate for the air speed.
In the Cisco ASR 9922 Router, the two top fan trays are located between the top and middle card cages,
while the two bottom fan trays are located between the middle and bottom card cages. In the Cisco ASR
9912 Router, the two fan trays are located above the line card cage. Each fan tray has 12 fans arranged
in three groups of four fans each. Two fans of each group share a fan controller. The power supplied to
the fan controller is 1:3 protected. A single fan failure has no impact on air flow because the other 11
fans will compensate for it. If the fan controller fails, there is a possibility of up to two fans failing;
however, the design always has two fans operating in a row (three rows of fans) to compensate for the
air speed.
Caution If only one fan tray is installed in the system, one single point of failure does not cause all fans to stop.
However, the system cannot operate without a fan tray. The system shuts itself off if all fan trays are
removed and the system crosses the Shutdown Temperature Threshold (STT).
Cooling Failure Alarm
Temperature sensors are installed in all cards and fan trays. These sensors detect and report any fan
failure or high temperature condition, and raise an alarm. Fan failure can be a fan stopping, fan controller
failure, power failure, or a failure of a communication link to the RSP/RP card.
Every card has temperature measurement points in the hottest expected area to clearly indicate a cooling
failure. The line cards have two sensors, one at the inlet and one near the hottest devices on the card. The
RSP/RP card also has two sensors.