Cisco ASR 9000 Series Aggregation Services Router Overview and Reference Guide
Bias-Free Language
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This chapter provides a functional description of the Cisco ASR 9000 Series Router, Route Switch Processor (RSP) card, Route
Processor (RP) card, Switch Fabric Controller (FC) card, Ethernet line cards, power and cooling systems, and subsystems such
as management, configuration, alarms, and monitoring.
Router
Operation
The ASR 9000 Series
Routers are fully distributed routers that use a switch fabric to interconnect
a series of chassis slots, each of which can hold one of several types of line
cards. Each line card in the Cisco ASR 9000 Series has integrated I/O and
forwarding engines, plus sufficient control plane resources to manage line card
resources. Two slots in the chassis are reserved for RSP/RP cards to provide a
single point of contact for chassis provisioning and management.
Major System Components and Interconnections in the Cisco ASR 9922 Router
shows the major system components and interconnections for the Cisco ASR 9922
Router. The switch fabric for the Cisco ASR 9912 Router is the same except that
the router supports up to 10 line cards. The switch fabric card
(ASR-9912-SFC110) for the Cisco ASR 9912 Router, is the only FC that has a
single fabric ASIC.
Figure 1. Cisco ASR 9010
Router, Cisco ASR 9006 Router, Cisco ASR 9904 Router and Cisco ASR 9910 Router
Platform Architecture
Figure 2. Cisco ASR 9922
Router and Cisco ASR 9912 Router Platform Architecture
Figure 3. Major Components
in the Cisco ASR 9000 Series Routers Line Cards
Figure 4. Additional
System Components in the Cisco ASR 9000 Series Routers Line Cards
Figure 5. Major System Components and Interconnections in the Cisco ASR 9922 Router
Route Switch Processor Card
The RSP card is the main control and switch fabric element in the Cisco ASR 9010 Router, Cisco ASR 9006 Router, Cisco ASR
9904 Router, Cisco and ASR 9906 Router. The Cisco ASR 9910 Router has Fabric Cards (FC) that acts as the main control element.
The RSP card provides system control, packet switching, and timing control for the system. To provide redundancy, there can
be two RSP cards in the system, one as the active control RSP and the other as the standby RSP. The standby RSP takes over
all control functions if the active RSP fails.
The RSP-440 (second generation) and RSP-880 (third generation) router processor cards support the next generation of Cisco
ASR 9000 Series line cards, and have increased bandwidth, memory, and processing capabilities.
RSP-440 Lite is a cost optimized version of the RSP-440 that offers the same 160 Gbps capacity which is license upgradeable
to the 400Gbps capacity.
RSP880-LT is a cost optimized version of the RSP-880 that offers the same 400Gbps capacity.
RSP5 is the next-generation system processor for the Cisco ASR 9000 Series Routers. It supports high-density 100 Gigabit Ethernet
line cards and provides backward compatibility with the Cisco ASR 9000 Series third generation family of line cards.
The RP card is the main control element in the Cisco ASR 9922 Router and Cisco ASR 9912 Router chassis. The switch fabric
element has been moved to the FC cards. The RP card provides system control, packet switching, and timing control for the
system. To provide redundancy, there are two RP cards in the system, one as the active control RP and the other as the standby
RP. The standby RP takes over all control functions should the active RP fail.
The RP2/RP3 card has more processing power than the previous RP card. It also doubles the amount of storage and supported memory as well
as the memory bandwidth. This provides the path to scale the number of routes up in this generation. In addition, the internal
control plane bandwidth has been scaled up to allow better control of the linecards as the network bandwidth increases.
In the Cisco ASR 9922 Router and Cisco ASR 9912 Router, the route processor functions are on the RP card. whereas the switch
fabric is on the FC card. The RSP/RP card also provides shared resources for backplane Ethernet, timing, and chassis control.
Redundant RSP/RP cards provide the central point of control for chassis provisioning, management, and data-plane switching.
Switch
Fabric
The switch fabric and
route processor functions are combined on a single RSP card in the Cisco ASR
9010 Router, Cisco ASR 9006 Router, Cisco ASR 9904 Router and Cisco ASR 9910
Router. The switch fabric portion of the RSP card links the line cards
together.
The switch fabric is
configured as a single stage of switching with multiple parallel planes. The
fabric is responsible for getting packets from one line card to another, but
has no packet processing capabilities. Each fabric plane is a single-stage,
non-blocking, packet-based, store-and-forward switch. To manage fabric
congestion, the RSP card also provides centralized Virtual Output Queue (VOQ)
arbitration.
The switch fabric is
1+1 redundant, with one copy of the fabric on each redundant RSP card. Each RSP
card carries enough switching capacity to meet the router throughput
specifications, allowing for full redundancy.
In systems with the RSP card, the switch fabric delivers up to 80-Gbps per line card slot.
In systems with the RSP-440 card or RSP-440 Lite card, the switch fabric delivers up to 220-Gbps per line card slot in redundant
1+1 mode and up to 440-Gbps per line card slot in non-redundant mode (two active RSPs).
In systems with the RSP4-S card the switch fabric delivers up to 220-Gbps per line card slot in redundant 1+1 mode and up
to 440-Gbps per line card slot in non-redundant mode (two active RSPs).
In systems with the RSP-880 card or A9K-RSP880-LT card, the switch fabric delivers up to 440-Gbps per line card slot in redundant 1+1 mode and up to 880-Gbps per line card slot
in non-redundant mode (two active RSPs).
In the Cisco ASR 9922
Router and Cisco ASR 9912 Router, the switch fabric resides on dedicated line
cards that connect to the backplanes alongside the RP cards.
For first and second generation line cards, the Cisco ASR 9922 Router and Cisco ASR 9912 Router support up to five FCs in
the chassis. Each FC card delivers 110G per slot. For example, when five FCs are installed in the chassis, the switch fabric
is considered 4+1 redundant (one card in standby mode and four cards active), thereby delivering 440Gbps per line card slot.
In non-redundant mode, the switch fabric delivers 550-Gbps per line card slot.
For third generation line cards, the Cisco ASR 9922 Router and Cisco ASR 9912 Router support up to seven FCs in the chassis.
Each FC card carries 230G per slot. For example, when five FCs are installed in the chassis, the switch fabric is 4+1 redundant
(one card in standby mode and four cards active), thereby delivering 920-Gbps per slot (230x4). In non-redundant mode, the
switch fabric delivers 1.15 Tbps per line card.
When all seven FC
cards are installed in the chassis, the switch fabric is 6+1 redundant one card
in standby mode and six cards in active), and is capable of delivering up to
1.38 Tbps per slot (230x6).
The following figure
shows the switch fabric interconnections for the Cisco ASR 9006 Router and
Cisco ASR 9010 Router.
Figure 6. Switch Fabric Interconnections —Cisco ASR 9006 Router and Cisco ASR 9010 Router
The following figure shows the switch fabric interconnections for the
Cisco ASR 9904 Router.
Figure 7. Switch Fabric Interconnections—Cisco ASR 9904 Router
The following figure
shows the switch fabric interconnections for the Cisco ASR 9922 Router. The
switch fabric for the Cisco ASR 9912 Router is the same except that the router
supports up to ten line cards and has a single FIC instead of two FICs.
Figure 8. Switch Fabric Interconnections—Cisco ASR 9922 Router
Unicast Traffic
Unicast traffic through the switch is managed by a VOQ scheduler chip. The VOQ scheduler ensures that a buffer is available
at the egress of the switch to receive a packet before the packet can be sent into the switch. This mechanism ensures that
all ingress line cards have fair access to an egress card, no matter how congested that egress card may be.
The VOQ mechanism is an overlay, separate from the switch fabric itself. VOQ arbitration does not directly control the switch
fabric, but ensures that traffic presented to the switch will ultimately have a place to go when it exits the switch, preventing
congestion in the fabric.
The VOQ scheduler is also one-for-one redundant, with one VOQ scheduler chip on each of the two redundant RSP/RP cards.
Multicast Traffic
Multicast traffic is replicated in the switch fabric. For multicast (including unicast floods), the Cisco ASR 9000 Series
Routers replicate the packet as necessary at the divergence points inside the system, so that the multicast packets can replicate
efficiently without having to burden any particular path with multiple copies of the same packet.
The switch fabric has the capability to replicate multicast packets to downlink egress ports. In addition, the line cards
have the capability to put multiple copies inside different tunnels or attachment circuits in a single port.
There are 64-K Fabric Multicast Groups (RSP 2-based line cards) or 128-K Fabric Multicast Groups (RSP-440 and RSP-880-based
line cards) in the system, which allow the replication to go only to the downlink paths that need them, without sending all
multicast traffic to every packet processor. Each multicast group in the system can be configured as to which line card and
which packet processor on that card a packet is replicated to. Multicast is not arbitrated by the VOQ mechanism, but it is
subject to arbitration at congestion points within the switch fabric.
Route Processor
Functions
The Route Processor
performs the ordinary chassis management functions. The ASR 9000 Series Routers
run Cisco IOS XR software, so the Route Processor runs the centralized portions
of the software for chassis control and management.
Secondary functions
of the Route Processor include boot media, system timing (frequency and time of
date) synchronization, precision clock synchronization, backplane Ethernet
communication, and power control (through a separate CAN bus controller
network).
The Route Processor
communicates with other route processors and linecards over a switched Ethernet
out-of-band channel (EOBC) for management and control purposes.
The following figure
shows the route processor interconnections on the RSP.
Figure 9. Route Processor Interconnections
The following figure shows the component interconnections on the RP.
Figure 10. RP Component Interconnections
The following figure shows the component interconnections on the FC.
Figure 11. FC Component
Interconnections
Processor-to-Processor Communication
The RSP/RP card communicates with the control processors on each line card through the Ethernet out-of-band channel (EOBC)
Gigabit Ethernet switch. This path is for processor-to-processor communication, such as IPC (InterProcess Communication).
The Active RSP/RP card also uses the EOBC to communicate to the Standby RSP/RP card, if installed (the RSP-880 and RP2/RP3 cards have 10GE switches used for EOBC).
Route Processor/Fabric Interconnect
The RSP card has a fabric interface chip (FIC) attached to the switch fabric and linked to the Route Processor through a Gigabit
Ethernet interface through a packet diversion FPGA. This path is used for external traffic diverted to the RSP card by line
card network processors.
The packet diversion FPGA has three key functions:
Packet header translation between the header used by the fabric interface chip and the header exchanged with the Ethernet
interface on the route processor.
I/O interface protocol conversion (rate-matching) between the 20-Gbps DDR bus from the fabric interface chip and the 1-Gbps
interface on the processor.
Flow control to prevent overflow in the from-fabric buffer within the packet diversion FPGA, in case of fabric congestion.
The Route Processor communicates with the switch fabric via a FIC to process control traffic. The FIC has sufficient bandwidth
to handle the control traffic and flow control in the event of fabric congestion. External traffic is diverted to the Route
Processor by the line card network processors.
The RP and FC cards in the Cisco ASR 9922 Router have control interface chips and FICs attached to the backplanes that provide
control plane and punt paths.
Fabric Controller
Card
On the Cisco ASR 9906 Router, Cisco ASR 9910 Router, Cisco ASR 9922 Router and Cisco ASR 9912 Router, the switch fabric resides on the switch fabric cards
(FCs).
The switch fabric is
configured as a single stage of switching with multiple parallel planes. The
switch fabric is responsible for transporting packets from one line card to
another but has no packet processing capabilities. Each fabric plane is a
single-stage, non-blocking, packet-based, store-and-forward switch. To manage
fabric congestion, the RP provides centralized Virtual Output Queue (VOQ)
arbitration.
Cisco ASR 9906 and 9910: When two RSP cards and three FC cards are installed in the chassis, the switch fabric is 4+1 redundant. When two RSP cards
and five FC cards are installed in the chassis, the switch fabric is 6+1 redundant. The switch fabric is fully redundant,
with one copy of the fabric on each FC, and each FC carries enough switching capacity to meet the chassis throughput specifications.
Cisco ASR 9912 and 9922: When five FC cards are installed in the chassis, the switch fabric is 4+1 redundant. When all seven FC cards are installed
in the chassis, the switch fabric is 6+1 redundant. The switch fabric is fully redundant, with one copy of the fabric on each
FC, and each FC carries enough switching capacity to meet the chassis throughput specifications.
Ethernet Line
Cards
Ethernet line cards
for the Cisco ASR 9000 Series Routers provide forwarding throughput of line
rate for packets as small as 64 bytes. The small form factor pluggable (SFP,
SFP+, QSFP+, XFP, CFP, or CPAK) transceiver module ports are polled
periodically to keep track of state changes and optical monitor values. Packet
features are implemented within network processor unit (NPU) ASICs.
Figure 12. General Line
Card Data Plane Block Diagram
The optics, NPU and
fabric interface handles all main data and also controls data that are routed
to the RSP/RP cards. The other path is to the local CPU through a switched
Gigabit Ethernet link. This second link is used to process control data routed
to the line card CPU or packets sent to the RSP/RP card through the fabric
link. The backplane Gigabit Ethernet links, one to each RSP/RP card, are used
primarily for control plane functions such as application image download,
system configuration data from the IOS XR software, statistics gathering, and
line card power-up and reset control.
The number of NPUs
will vary depending on the number of ports. Each NPU can handle millions of
packets per second, accounting for ingress and egress, with a simple
configuration. The more packet processing features enabled, the lower the
packets per second that can be processed in the pipeline. There is a minimum
packet size of 64 bytes, and a maximum packet size of 9 KB (9216 bytes) from
the external interface.
The modular line card
is available in two network processing unit (80-Gb throughput versions. Each version is
available in either a Service Edge Optimized (-SE) or Packet Transport
Optimized (-TR) version. Both versions are functionally equivalent, but vary in
configuration scale and buffer capacity.
The following figure
shows a modular line card with a 20-port Gigabit Ethernet modular port adapter
(MPA) installed in the lower bay. As shown in the figure, Bay 0 is the “upper”
or “left” bay, and Bay 1 is the “lower” or “right” bay.
Figure 13. Modular Line
Card
The MPA has
Active/Link (A/L) LEDs visible on the front panel. Each A/L LED shows the
status of both the port and the link. A green A/L LED means the state is on,
the port is enabled, and the link is up. An amber A/L LED means the state is
on, the port is enabled, and the link is down. An A/L LED that is off means the
state is off, the port is not enabled, and the link is down.
For MPA installation information, see the Cisco ASR 9000 Series
Aggregation Services Routers Ethernet Line Card Installation Guide .
Power System Functional Description
The Cisco ASR 9000 Series Routers can be powered with an AC or DC source power. The power system is based on a distributed
power architecture centered around a –54 VDC printed circuit power bus on the system backplane.
The –54 VDC system backplane power bus can be sourced from one of two options:
AC systems—AC/DC bulk power supply tray connected to the user’s 200 to 240 V +/- 10 percent (180 to 264 VAC) source.
DC systems—DC/DC bulk power supply tray connected to the user’s Central Office DC battery source (–48VDC to -60VDC nominal).
The system backplane distributes DC power from the backplane to each card and the fan trays. Each card has on-board DC-DC
converters to convert the –54 VDC from the distribution bus voltage to the voltages required by each particular card.
The power system is isolated from the central office by the transformers inside the power modules. It has single-point grounding
on the –54 VDC return.
All field replaceable modules of the power system are designed for Online Insertion and Removal (OIR), so they can be installed
or removed without causing interruption to system operation.
Note
The Cisco ASR 9000 Series Routers have two available DC version 1 power modules, a 2100 W module and a 1500 W module. Both
types of power modules can be used in a single chassis. The routers have one available DC version 2 power module (2100 W),
and one available DC version 3 power module (4400 W).
Power Modules
Multiple AC/DC power
modules can be installed in each AC/DC power tray.
The following figure
shows the version 1 power module.
Figure 14. Version 1 Power
Module
The following figure
shows the version 2 power module. The version 3 power module is similar.
Door latch
Door and ejector lever
LED indicators
Figure 15. Version 2 Power
Module
Power Module Status
Indicators
The following figure
shows the status indicators for the version 1 power module.
Figure 16. Version 1 Power
Module Status Indicators
1
Input LED
ON
continuously when the input voltage is present and within the correct
range.BLINKING when the input voltage is out of acceptable range.OFF when no
input voltage is present.
2
Output LED
ON when the
power module output voltage is present.BLINKING when the power module is in a
power limit or overcurrent condition.
3
Fault LED
ON
indicates that a power supply failure has occurred.
The following figure shows the status indicators for the version 2
power module. The status indicators for the version 3 power module are similar.
Figure 17. Version 2 Power
Module Status Indicators
1
Input LED
ON
continuously when the input voltage is present and within the correct
range.BLINKING when the input voltage is out of acceptable range.OFF when no
input voltage is present.
2
Output LED
ON when the
power module output voltage is present.BLINKING when the power module is in a
power limit or overcurrent condition.
3
Fault LED
ON
indicates that a power supply failure has occurred.
System Power Redundancy
Both the AC and DC power systems have system power redundancy depending on the chassis configuration. Each tray can house
up to four modules and can be configured for multiple power configurations. For more information about power system redundancy,
see Power Supply Redundancy.
AC Power
Trays
The AC power provides
20-A UL/CSA-rated, 16-IEC-rated AC receptacles. The version 1 receptacle has a
bail lock retention bracket to retain the power cord. The version 2 and version
3 receptacles have a clamp mechanism with a screw that can be tightened to
retain the power cord. DC output power from the is connected to the router by
two power blades that mate to the power bus on the backplane. System
communication is through a I2C cable from the backplane.
The following figure
shows the back of the version 1.
Figure 18. Version 1 Rear
Panel
1
DC output
power blades
3
Power
switch
2
IEC input
receptacles with retention brackets
4
I2C cable
from backplane
The following figure shows the back of the version 2
Figure 19. Version 2 Rear
Panel
1
DC output
power blades
3
I2C cable
from backplane
2
IEC input
receptacles with retention brackets
The following figure shows the back of the version 3
Figure 20. Version 3 Rear
Panel
1
DC output
power blades
3
I2C cable
from backplane
2
IEC input
receptacles with retention brackets
AC Tray Power
Switch
Each provides a
single-pole, single-throw power switch to power on and put in standby mode all
power modules installed in the tray simultaneously. When the power modules are
turned off, only the DC output power is turned off; the power module fans and
LEDs still function. The power switch for the version 1 power tray is on the
back of the tray, as shown in the following figure. The power switch for the
version 2 and version 3 power tray is on the front is shown in the following
figure.
Figure 21. Location of AC
Power Switch - Version 2 and Version 3 Power System
Power switch
AC Input Voltage Range
Each AC module accepts an individual single phase 220-VAC 20-A source. AC Input Voltage Range shows the limits of the specified AC input voltage. The voltages given are single phase power source.
DC Output Levels
The output for each module is within the tolerance specifications (Power System DC Output Levels) under all combinations of input voltage variation, load variation, and environmental conditions. The combined, total module
output power does not exceed 3000 W.
The AC tray output capacity depends on how many modules are populated. Maximum output current is determined by multiplying
the maximum module current times module quantity. For example, to determine the maximum capacity with three power supply modules,
multiply the current by three (x3).
AC System Operation
This section describes the normal sequence of events for system AC power up and power down.
Power Up
AC power is applied to the power tray by toggling the user’s AC circuit breakers to the ON position.
AC/DC power supplies are enabled by toggling the Power On/Off logic switch located in each of the power trays to the ON position.
AC/DC modules in the power trays provide –54 VDC output within six seconds after the AC is applied.
The soft-start circuit in the logic cards takes 100 milliseconds to charge the input capacitor of the on-board DC/DC converters.
The card power controller MCU enables the power sequencing of the DC/DC converters and points of load (POLs) through direct
communication using the PMBus interface to digital controllers.
The output of the DC/DC converters ramps up to regulation within 50 milliseconds maximum after the program parameters are
downloaded to each POL and the On/Off control pin has been asserted.
Power Down
Power conversion is disabled by toggling the Power On/Off logic switch to the OFF position or unplugging the power cords from
the AC power source.
The AC/DC modules in the power trays stay within regulation for a minimum of 15 milliseconds after the AC power is removed.
The –54 V to the logic card ramps down to –36 V in 15 milliseconds minimum from the time the AC/DC modules starts ramping
down from its minimum regulation level.
The DC/DC converters turn off immediately after the On/Off control pin is deasserted.
The output of the DC/DC converters stays in regulation for an additional 0.1 millisecond.
DC Power
Trays
The DC power tray
(DC Power Tray Rear Panel)
provides two power feed connector banks: A feed and B feed. System
communication is through a I2C cable from the backplane.
DC Tray Power Switch
Each DC power tray provides a single-pole, single-throw power switch to power on and off all of the power modules installed
in the tray simultaneously. When the power modules are turned off, only the DC output power is turned off; the power module
fans and LEDs still function. The power switch is on the front panel.
Figure 23. DC Power Tray
Rear Panel - Cisco ASR 9006 Router and Cisco ASR 9904 Router (Version 2 Power
System)
1
DC output
power blades
3
“B” power
feed connectors
2
“A” power
feed connectors
4
I2C cable
from backplane
Figure 24. DC Power Tray
Rear Panel—Version 3 Power System
1
DC output
power blades
3
“B” power
feed connectors
2
“A” power
feed connectors
4
I2C cable
from backplane
DC System Operation
This section describes the normal sequence of events for system DC power up and power down.
Power Up
DC power is applied to the power tray by toggling the user’s DC circuit breakers to “ON” position.
DC/DC power supplies are enabled by toggling the Power On/Off logic switch located in each of the power tray to ON position.
DC/DC power supply modules in the power tray provides –54 VDC output within seven seconds after the DC is applied.
The soft-start circuit in the logic cards takes 100 milliseconds to charge the input capacitor of the on-board DC/DC converters.
The card power controller, MCU, enables the power sequencing of the DC/DC converters and POLs through direct communication
using a PMBus interface to digital controllers such as LT7510 or through a digital wrapper such as LT2978.
The output of the DC/DC converters ramp up to regulation within 50 milliseconds maximum. after the program parameters are
downloaded to each POL and On/Off control pin has been asserted.
Power Down
Power conversion is disabled by toggling the Power On/Off logic switch in the power tray to OFF position.
The DC/DC modules in the power tray stays within regulation for a minimum of 3.5 milliseconds after the Power On/Off logic
switch is disabled.
The –54V DC to the logic card ramps down to –36 VDC in 3.5 milliseconds minimum from the time the DC/DC modules starts ramping
down from its minimum regulation level.
The DC/DC converters powers off immediately after the On/Off pin is deasserted.
The output of the DC/DC converters stays in regulation for an additional 0.1 millisecond.
Cooling System
Functional Description
The Cisco ASR 9000
Series Routers chassis is cooled by removable fan trays. The fan trays provide
full redundancy and maintain required cooling if a single fan failure should
occur. The following table describes the cooling paths for each router.
Table 1. Cooling Paths for
the Cisco ASR 9000 Series Routers
Figure 25. Cisco ASR 9010
Router Chassis Cooling Path—Side View
Figure 26. Cisco ASR 9006
Router Chassis Cooling Path
Figure 27. Cisco ASR 9904
Router Chassis Cooling Path
Figure 28. Cisco ASR 9906 Router Chassis Cooling Path
Figure 29. Cisco ASR 9910
Router Chassis Cooling Path—Side View
Figure 30. Cisco ASR 9922
Router Chassis Cooling Path—Side View
Figure 31. Cisco ASR 9912
Router Chassis Cooling Path—Side View
Fan Trays
Cisco ASR 9010
Router Fan Trays
The Cisco ASR 9010
Router contains two fan trays for redundancy. The fan tray has an LED indicator
to indicate fan tray status. If a fan tray fails, 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.
Fan tray status LED
The fan tray contains 12 axial 120-mm (4.72-in) fans. There is a fan control board at the back end of each tray with a single
power/data connector that connects with the backplane.
The fan tray aligns through two guide pins inside the chassis, and it is secured by two captive screws. The controller board
floats within the fan tray to allow for alignment tolerances.
A finger guard is adjacent to the front of most fans to keep fingers away from spinning fan blades during removal of the
fan tray.
The maximum weight of the fan tray is 13.82 lb (6.29 kg).
Cisco ASR 9006
Router Fan Trays
The Cisco ASR 9006 Router contains two fan trays for redundancy. If a fan tray fails, 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.
Note
Both fan trays are required for normal system operation for the Cisco ASR 9010 Router and Cisco ASR 9006 Router. If both fan
trays in the router are pulled out or are not installed, a critical alarm is raised.
Figure 32. Cisco ASR 9006
Router Fan Tray
The fan tray contains six axial 92-mm (3.62-in) fans. There is a fan control board at the back end of each tray with a single
power/data connector that connects with the backplane.
The fan tray aligns through two guide pins inside the chassis, and is secured by one captive screw. The controller board
floats within the fan tray to allow for alignment tolerances.
A finger guard is adjacent to the front of most of the fans to keep fingers away from spinning fan blades during removal
of the fan tray.
The maximum weight of the fan tray is 39.7 lb (18.0 kg).
Cisco ASR 9904
Router Fan Tray
The Cisco ASR 9904
Router contains a single fan tray. If a fan tray fails, it is possible to swap
a single fan tray assembly while the system is operational. Replace the missing
fan tray within 4 minutes.
Figure 33. Cisco ASR 9904
Router Fan Tray
The fan tray contains twelve axial
88-mm (3.46-in) fans. There is a fan control board at the back end of the tray
with a single power/data connector that connects with the backplane
The fan tray
aligns through two guide pins inside the chassis, and it is secured by one
captive screw. The controller board floats within the fan tray to allow for
alignment tolerances.
A finger guard is
adjacent to the front of most of the fans to keep fingers away from spinning
fan blades during removal of the fan tray.
The maximum weight
of the fan tray is 11.0 lb (4.99 kg).
Cisco ASR 9906 Router Fan Trays
The Cisco ASR 9906 Router contains two fan trays for redundancy. If a fan tray fails, 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.
Note
Both fan trays are required for normal system operation for the Cisco ASR 9906 Router. If both fan trays in the router are
pulled out or are not installed, a critical alarm is raised.
Figure 34. Cisco ASR 9906 Router Fan Tray
The fan tray contains seven axial 92-mm (3.62-in) fans. There is a fan control board at the back end of each tray with a single
power/data connector that connects with the backplane.
The fan tray aligns through two guide pins inside the chassis, and is secured by one captive screw. The controller board floats
within the fan tray to allow for alignment tolerances.
A finger guard is adjacent to the front of most of the fans to keep fingers away from spinning fan blades during removal of
the fan tray.
The maximum weight of the fan tray is 8.0 lb (3.63 kg).
Cisco ASR 9910
Router Fan Trays
The Cisco ASR 9910
Router contains two fan trays for redundancy . The fan tray has an LED
indicator to indicate fan tray status. If a fan tray fails, 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.
Fan tray status LED
The fan tray contains 12 axial 134-mm
(5.27-in) fans. There is a fan control board at the back end of each tray with
a single power/data connector that connects with the backplane.
The fan tray
aligns through two guide pins inside the chassis, and it is secured by two
captive screws. The controller board floats within the fan tray to allow for
alignment tolerances.
A finger guard is
adjacent to the front of most fans to keep fingers away from spinning fan
blades during removal of the fan tray.
The maximum weight
of the fan tray is 26.55 lb (12.04 kg).
Cisco ASR 9922
Router and Cisco ASR 9912 Router Fan Trays
The Cisco ASR 9922
Router contains four fan trays, and the Cisco ASR 9912 Router contains three
fan trays for redundancy. The fan tray has an LED indicator to indicate fan
tray status. If a fan tray fails, 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.
Note
Do not operate the
chassis with any of the fan trays completely missing. Replace any missing fan
tray within five minutes.
Figure 35. Cisco ASR 9922
Router and Cisco ASR 9912 Router Fan Tray
Fan tray status LED
The fan tray contains 12 axial 120-mm (4.72-in) fans. There is a fan control board at the back end of each tray with a single
power/data connector that connects with the backplane.
The fan tray aligns through two guide pins inside the chassis, and it is secured by two captive screws. The controller board
floats within the fan tray to allow for alignment tolerances.
A finger guard is adjacent to the front of most fans to keep fingers away from spinning fan blades during removal of the fan
tray.
The maximum weight of the fan tray is 18.00 lb (8.16 kg).
The fan tray width is increased from 16.3 inches to 17.3 inches. The overall fan tray depth remains the same at 23 inches.
The individual fan current rating is increased to 2 A to support higher speeds.
Fan Tray Status Indicators
The fan tray has a Run/Fail status LED on the front panel to indicate fan tray status.
After fan tray insertion into the chassis, the LED lights up temporarily appearing yellow. During normal operation:
The LED lights green to indicate that all fans in the module are operating normally.
The LED lights red to indicate a fan failure or another fault in the fan tray module. Possible faults are:
Fan stopped.
Fans running below required speed to maintain sufficient cooling.
Controller card has a fault.
Fan Tray Servicing
No cables or fibers must be moved during installation or removal of the fan tray(s). Replacing fan trays does not interrupt
service.
Slot Fillers
To maintain optimum cooling performance in the chassis and at the slot level, unused slots must be filled with card blanks
or flow restrictors. These slot fillers are simple sheet metal only and are not active. Software cannot detect their presence.
Chassis Air Filters
(Version 1 and Version 2)
The chassis air
filters in the Cisco ASR 9000 Series Routers are NEBS compliant. The filter is
not serviceable but is a field replaceable unit. Replacing the filter does not
interrupt service. The following table describes the chassis air filter
locations for the Cisco ASR 9000 Series Routers.
Table 2. Chassis Air Filter
Locations for the Cisco ASR 9000 Series Routers
Three air
filters on the RP/FC card cage (Cisco ASR 9912
Router Chassis Air Filters ).
The center air filter covers the front of the FC cards. The side air filters
cover the RP cards.
Figure 36. Cisco ASR 9010
Router Chassis Air Filter
Figure 37. Cisco ASR 9006
Router Chassis Air Filter
1
Air filter
2
Thumb screw
Figure 38. Cisco ASR 9904
Router Air Filter
1
Air filter
2
Thumb screw
Figure 39. Cisco ASR 9906 Router Chassis Air Filter
Figure 40. Cisco ASR 9910
Router Chassis Air Filter
Figure 41. Cisco ASR 9922
Router Chassis Air Filters —Version 1
Figure 42. Cisco ASR 9922
Router Chassis Air Filter—Version 2
Figure 43. Cisco ASR 9922
Router Chassis Center Air Filter —Version 1
1
Loosen
thumb screws
3
Remove foam
filter media
2
Rotate and
lower inner frame
Figure 44. Cisco ASR 9922
Router Chassis Side Air Filter —Versions 1 and 2
1
Loosen
thumb screws
3
Remove
foam filter media
2
Rotate
and lower inner frame
Figure 45. Cisco ASR 9912
Router Chassis Air Filters
Speed Control
The cooling system adjusts its speed to compensate for changes in system or external ambient temperatures. To reduce operating
noise, the fans have variable speeds. Speed can also vary depending on system configurations that affect total power dissipation.
If lower power cards are installed, the system could run at slower speeds; if higher power cards are installed, the system
could run at faster speeds
Fan speed is managed by the RSP/RP card and the controller card in the fan tray. The RSP/RP monitors card temperatures and
sends a fan speed to the controller card.
If the failure of a single fan within a module is detected, the failure causes an alarm and all the other fans in the fan
tray go to full speed.
Note
Complete failure of one fan tray causes the remaining fan tray to operate its fans at full speed continuously until a replacement
fan tray is installed.
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. Assuming redundant configuration, removal of a fan tray results in zero packet
loss.
Fan tray removal does not require removal of any cables.
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.
All system management interfaces have fault and physical inventory.
Command-Line Interface
The CLI supports configuration file upload and download through TFTP. The system supports generation of configuration output
without any sensitive information such as passwords, keys, etc. The Cisco ASR 9000 Series Routers support Embedded Fault Manager
(TCL-scripted policies) through CLI commands. The system also supports feature consistency between the CLI and SNMP management
interfaces.
Craft Works Interface
The system supports CWI, a graphical craft tool for performance monitoring, configuration editing, and configuration rollback.
CWI is embedded with Cisco IOS XR software and can be downloaded through the HTTP protocol. A user can use CWI to edit the
router configuration file, create user-defined applications, and open Telnet/SSH application windows to provide CLI access.
XML
External (or XML) clients can programmatically access the configuration and operational data of the Cisco ASR 9000 Series
Router using XML. The XML support includes retrieval of inventory, interfaces, alarms, and performance data. The system is
capable of supporting 15 simultaneous XML/SSH sessions. The system supports alarms and event notifications over XML and also
supports bulk PM retrieval and bulk alarms retrieval.
XML clients are provided with the hierarchy and possible contents of the objects that they can include in their XML requests
(and can expect in the XML responses), documented in the form of an XML schema.
When the XML agent receives a request, it uses the XML Service Library to parse and process the request. The Library forwards
the request to the Management Data API (MDA) Client Library, which retrieves data from the SysDB. The data returned to the
XML Service Library is encoded as XML responses. The agent then processes and sends the responses back to the client as response
parameter of the invoke method call. The alarm agent uses the same XML Service Library to notify external clients about configuration
data changes and alarm conditions.
SNMP
The SNMP interface allows management stations to retrieve data and to get traps. It does not allow setting anything in the
system.
SNMP Agent
In conformance with SMIv2 (Structure of Management Information Version 2) as noted in RFC 2580, the system supports SNMPv1,
SNMPv2c, and SNMPv3 interfaces. The system supports feature consistency between the CLI and SNMP management interfaces.
The system is capable of supporting at least 10 SNMP trap destinations. Reliable SNMP Trap/Event handling is supported.
For SNMPv1 and SNMPv2c support, the system supports SNMP View to allow inclusion/exclusion of Miss for specific community
strings. The SNMP interface allows the SNMP SET operation.
MIBs
The Device Management MIBs supported by the ASR 9000 Series Routers are listed at:
System run-time diagnostics are used by the Cisco Technical Assistance Center (TAC) or the end user to troubleshoot a field
problem and assess the state of a given system.
Some examples of the run-time diagnostics include the following:
Monitoring line card to RSP/RP card communication paths
Monitoring line card to RSP/RP card data path
Monitoring CPU communication with various components on the line cards and RSP/RP cards
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