Maintaining the Cisco uBR7225VXR Router
This chapter describes basic maintenance for the Cisco uBR7225VXR universal broadband router and contains the following sections:
•Online Insertion and Removal
•Environmental Monitoring and Reporting Functions
Online Insertion and Removal
The cable interface line cards and network processing engine in the Cisco uBR7225VXR universal broadband router support online insertion and removal (OIR). Technically, the Cisco uBR7225VXR universal broadband router supports true OIR, or "hot swapping," of cable interface line cards only when exchanging cable interface line cards of the exact same type (for example, exchanging a Cisco uBR-MC28U line card for another Cisco uBR-MC28U line card). Under these conditions, no reload of the router is required.
You can remove and replace a cable interface line card with the same type of component without interrupting the system. This function allows you to install and replace the same type of cable interface cards while the router is operating.
Note To replace a cable interface line card with a different type of line card (for example, hot swapping from a Cisco uBR-MC16U to a Cisco uBR-MC28U, you must copy your startup configuration to your running configuration on the Cisco uBR7225VXR router to enable the interfaces on the new cable interface line card.
When you use OIR for different types of cable interface line cards (for example, a Cisco uBR-MC16U line card replaced by a Cisco uBR-MC28U line card), you might have to reconfigure the interfaces, and we highly recommend that you reload the router.
Detailed instructions for installing Cisco cable interface cards are contained in the document Cisco uBR7200 Series Cable Interface Line Card Hardware Installation Guide at the following URL:
The network processing engine cannot be removed if the router is operating. Removing the network processing engine while the Cisco uBR7225VXR router is operating causes the router to shut down or crash, and might damage or destroy memory files.
Each cable interface line card has a bus connector that connects it to the router's midplane. Each midplane connector has a set of tiered pins in three lengths. The pins send specific signals to the system as they make contact with the cable interface line card. The system assesses the signals it receives and the order in which it receives them to determine if a board is being removed or inserted into the midplane. From these signals, the system determines whether to reinitialize a new interface or shut down a removed interface. For example, when inserting a cable interface line card, the longest pins make contact with the cable interface line card first, and the shortest pins make contact last. The system recognizes the signals and the sequence in which it receives them.
When you remove or insert a cable interface line card in a Cisco uBR7225VXR router, the midplane pins send signals to notify the system, which then does the following:
1. Rapidly scans the midplane for configuration changes.
2. Initializes all newly inserted cable interface line cards, noting any removed interfaces and placing them in the administratively shutdown state.
3. Brings all previously configured interfaces on the cable interface line card back to the state they were in when it was removed. If the same type of interface card type is reinserted into a slot, its interfaces are configured and brought online up to the interface count of the original cable interface line card. If, however, any new interfaces are put in the administratively shutdown state, as if they were present (but not configured) at boot time, the system must be configured.
Environmental Monitoring and Reporting Functions
Environmental monitoring and reporting functions are controlled by the network processing engine and allow you to maintain normal system operation by identifying and resolving adverse conditions before loss of operation. The environmental monitoring functions constantly monitor the internal chassis air temperature and AC supply voltages. Each power supply monitors its own voltage, currents, and temperature and shuts itself down if it detects a critical condition within the power supply. If conditions reach shutdown thresholds, the system shuts down to avoid equipment damage from excessive heat. The reporting functions periodically log the values of measured parameters so that you can retrieve them for analysis later, and the reporting functions display warnings on the console if any of the monitored parameters exceed defined thresholds.
The environmental monitoring functions use the following five levels of status conditions to monitor the system. Two sensors on the network processing engine monitor the temperature of the cooling air as it moves through the chassis.
•Normal—All monitored parameters are within normal tolerances.
•Warning—The system has exceeded a specified threshold. The system continues to operate, but we recommend operator action to bring the system back to a normal state.
•Critical—An out-of-tolerance temperature or voltage condition exists. The system continues to operate; however, the system is approaching shutdown. Immediate operator action is required.
•Shutdown—The processor has detected a temperature condition that could result in physical damage to system components and has disabled DC power to all internal components. Requires immediate operator action. Before any shutdown, the system logs the status of monitored parameters in NVRAM so that you can retrieve it later to help determine the cause of the problem. The power supply repeatedly attempts to restart itself within 90 seconds to clear the temperature condition.
•Power supply shutdown—The power supply detected an internal out-of-tolerance overvoltage, overcurrent, or temperature condition and shut itself down. The power supply repeatedly attempts to restart itself within 90 seconds to clear the shutdown condition.
Table 5-1 lists the temperature thresholds for the processor-monitored levels.
Table 5-1 Typical Processor-Monitored Temperature Thresholds for the Cisco uBR7225VXR
MP NPE Inlet
MP LC Inlet
Temperature sensors are located on the NPE Inlet and NPE Outlet. See the appropriate chapter for your NPE in the Network Processing Engine and Network Services Engine Installation and Configuration document for their exact locations. Temperature MP NPE Inlet is located on NPE side of the inlet edge of the midplane. Temperature MP LC Inlet is located on line card side of the inlet edge of the midplane. Temperature MP NPE is located on NPE side of the middle of the midplane. Temperature MP LC is located on line card side of the middle of the midplane.
If the air temperature exceeds a defined threshold, the system controller displays warning messages on the console terminal and, if the temperature exceeds the shutdown threshold, it shuts down the system. The system stores the present parameter measurements for both temperature and DC voltage in NVRAM so that you can retrieve them later as a report of the last shutdown parameters.
The power supplies monitor internal power supply temperature and voltages. A power supply is either within tolerance (normal) or out of tolerance (critical). If an internal power supply temperature or voltage reaches a critical level, the power supply shuts down without any interaction with the system processor.
The Cisco uBR7225VXR router displays warning messages on the console if chassis interface-monitored parameters exceed a desired threshold. You can also retrieve and display environmental status reports with the show environment, show environment all, show environment last, and show environment table commands. Parameters are measured and reporting functions are updated every 60 seconds. A brief description of each of these commands follows.
To prevent overheating the chassis, ensure that your system is drawing cool inlet air. Overtemperature conditions can occur if the system is drawing in the exhaust air of other equipment. Ensure adequate clearance around the sides of the chassis so that cooling air can flow through the chassis interior unimpeded and exhaust air exits the chassis and is not drawn into the inlet vent of other devices.
The show environment command display reports the current environmental status of the system. The report displays parameters that are out of the normal values. No parameters are displayed if the system status is normal. The example that follows shows the display for a system in which all monitored parameters are within normal range:
All measured values are normal
If the environmental status is not normal, the system reports the worst-case status level. Following is an example overvoltage warning:
Warning: +3.45 V measured at +3.83 V
The show environment last command retrieves and displays the NVRAM log, which shows the reason for the last system shutdown (if the shutdown was related to voltage or temperature) and the environmental status at that time. Air temperature is measured and displayed, and the DC voltage supplied by the power supply is also displayed.
Following is sample output of the show environment last command for a Cisco uBR7225VXR router:
Router# show environment last
NPE Inlet previously measured at 26C/78F
NPE Outlet previously measured at 29C/84F
MP NPE Inlet previously measured at 24C/75F
MP NPE previously measured at 30C/86F
MP LC Inlet previously measured at 27C/80F
MP LC previously measured at 30C/86F
CPU Die previously measured at 45C/113F
+3.30 V previously measured at +3.28
+1.50 V previously measured at +1.49
+2.50 V previously measured at +2.48
+1.80 V previously measured at +1.78
+1.20 V previously measured at +1.19
VDD_CPU previously measured at +1.27
VDD_MEM previously measured at +2.48
VTT previously measured at +1.24
+3.45 V previously measured at +3.49
-11.95 previously measured at -11.79
+5.15 V previously measured at +5.00
+12.15 V previously measured at +11.71
+1.2 V(MP NPE) previously measured at +1.19
+1.8 V(MP NPE) previously measured at +1.81
+3.45 V(MP NPE) previously measured at +3.56
+5.15 V(MP NPE) previously measured at +5.27
+12 V(MP NPE) previously measured at +11.81
-12 V(MP NPE) previously measured at -12.00
+5.15 V(MP LC) previously measured at +5.27
+12 V(MP LC) previously measured at +11.81
last shutdown reason - power supply shutdown
The show environment table command displays the temperature and voltage thresholds for each temperature sensor and for each monitored status level, which are related to those thresholds listed in Table 5-1. The display also lists the shutdown threshold for the system. You can abbreviate the command to sh env table.
Following is sample output of the show environment table command for a Cisco uBR7225VXR router:
Router# show environment table
Sample Point LowCritical LowWarning HighWarning HighCritical
NPE Inlet 44C/111F 59C/138F 80C/176F
NPE Outlet 49C/120F 64C/147F 84C/183F
MP NPE Inlet 49C/120F 64C/147F 84C/183F
MP NPE 49C/120F 64C/147F 84C/183F
MP LC Inlet 41C/105F 56C/132F 76C/168F
MP LC 42C/107F 57C/134F 77C/170F
CPU Die 90C/194F 105C/221F 110C/230F
+3.30 V +2.30 +3.12 +3.47 +4.29
+1.50 V +1.05 +1.40 +1.57 +1.95
+2.50 V +1.71 +2.34 +2.65 +3.28
+1.80 V +1.25 +1.67 +1.91 +2.34
+1.20 V +0.82 +1.13 +1.28 +1.56
VDD_CPU +0.89 +1.21 +1.36 +1.71
VDD_MEM +1.71 +2.34 +2.65 +3.28
VTT +0.85 +1.17 +1.32 +1.64
+3.45 V +2.42 +3.24 +3.63 +4.49
-11.95 -7.14 -9.54 -14.28 -16.12
+5.15 V +3.63 +4.84 +5.46 +6.75
+12.15 V +8.55 +11.36 +12.89 +14.94
+1.2 V(MP NPE) +1.01 +1.12 +1.26 +1.37
+1.8 V(MP NPE) +1.51 +1.67 +1.90 +2.05
+3.45 V(MP NPE) +3.00 +3.31 +3.77 +4.08
+5.15 V(MP NPE) +4.46 +4.92 +5.55 +5.96
+12 V(MP NPE) +10.13 +11.22 +12.65 +13.74
-12 V(MP NPE) -13.87 -13.29 -10.83 -10.24
+5.15 V(MP LC) +4.44 +4.91 +5.56 +6.03
+12 V(MP LC) +10.18 +11.25 +12.68 +13.81
Note Temperature ranges and values are subject to change.
The show environment all command displays an extended report that includes temperature readings and voltage readings. The show environment all command also displays a report showing which power supply slots are occupied and which are empty.
Following is sample output of the show environment all command for a Cisco uBR7225VXR router:
Router# show environment all
Power Supply 1 is AC C49-300. Unit is on.
NPE Inlet measured at 25C/77F
NPE Outlet measured at 29C/84F
MP NPE Inlet measured at 23C/73F
MP NPE measured at 30C/86F
MP LC Inlet measured at 28C/82F
MP LC measured at 31C/87F
CPU Die measured at 45C/113F
+3.30 V measured at +3.28 V
+1.50 V measured at +1.49 V
+2.50 V measured at +2.48 V
+1.80 V measured at +1.78 V
+1.20 V measured at +1.19 V
VDD_CPU measured at +1.27 V
VDD_MEM measured at +2.48 V
+3.45 V measured at +3.49 V
-11.95 measured at -11.79 V
+5.15 V measured at +5.00 V
+12.15 V measured at +11.71 V
+1.2 V(MP NPE) measured at +1.19 V
+1.8 V(MP NPE) measured at +1.81 V
+3.45 V(MP NPE) measured at +3.56 V
+5.15 V(MP NPE) measured at +5.27 V
+12 V(MP NPE) measured at +11.81 V
-12 V(MP NPE) measured at -12.00 V
+5.15 V(MP LC) measured at +5.27 V
+12 V(MP LC) measured at +11.81 V
Envm stats saved 2 time(s) since reload
When the system power is on, the Cisco uBR7225VXR router fans should be operational. The system continues to operate if a fan fails; however, if the air temperature exceeds a defined threshold, the system controller displays warning messages on the console terminal and, if the temperature exceeds the shutdown threshold, it shuts down the system.
If the system does shut down because the temperature exceeded the shutdown threshold, the system displays the following message on console screen and in environment display when the system restarts:
%ENVM-1-SHUTDOWN: Environmental Monitor initiated shutdown
For complete descriptions and instructions for the environmental monitor commands, refer to the following documents:
Cisco IOS CMTS Command Reference Guide at the following URL:
Cisco IOS CMTS Cable Software Configuration Guide at the following URL:
Cisco IOS Configuration Fundamentals Command Reference at the following URL: