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Cisco ASR 9000 Series Aggregation Services Router Overview and Reference Guide
OL-17501-09
Chapter 2 Functional Description
System Management and Configuration

Temperature Sensing and Monitoring

Temperature sensors are present on cards to monitor the internal temperatures. Line cards and RSP/RP
cards have their leading edge (inlet) and hottest spot continuously monitored by temperature sensors.
Some cards have additional sensors located near hot components that need monitoring. Some ASICS
have internal diodes that might be used to read junction temperatures.
If the ambient air temperature is within the normal operating range, the fans operate at the lowest speed
possible to minimize noise & power consumption.
If the air temperature in the card cage rises, fan speed increases to provide additional cooling air to the
internal components. If a fan fails, the others increase in speed to compensate.
Fan tray removal triggers environmental alarms and increases the fan speed of the remaining tray to its
maximum speed.

Servicing

The system is populated with two fan trays for redundancy. If a fan tray failure occurs, it is possible to
swap a single fan tray assembly while the system is operational.
Fan tray removal does not require removal of any cables.
Assuming redundant configuration, removal of a fan tray results in zero packet loss.

System Shutdown

When the system reaches critical operating temperature points, it triggers a shutdown sequence of the
system.
System Management and Configuration
The Cisco IOS XR Software on the ASR 9000 Series Routers provides the system manageability
interfaces: CLI, XML, and SNMP.

Cisco IOS XR Software

The ASR 9000 Series Routers run Cisco IOS XR Software and use the manageability architecture of
that operating system, which includes CLI, XML, and SNMP. Craft Works Interface (CWI), a graphical
craft tool for performance monitoring, is embedded with the Cisco IOS XR Software and can be
downloaded through the HTTP protocol. However, the ASR 9000 Series Routers support only a subset
of CWI functionality. In this mode, a user can edit the router configuration file, open Telnet/SSH
application windows, and create user-defined applications.

System Management Interfaces

The system management interfaces consist of the CLI, XML, and SNMP protocols. By default, only CLI
on the console is enabled. When the management LAN port is configured, various services can be started
and used by external clients, such as Telnet, SSH, and SNMP, In addition, TFTP and Syslog clients can
interact with external servers. CWI can be downloaded and installed on a PC or Solaris box.