The intended audience of this post are those who are not yet have any experience in the real working environment of being a Network Engineer. Here is the list of the commands that I believe will be helpful and are not taught in books and can only be experience in a real hardware:
- show inventory
“show inventory” command shows the physical hardware information of the device and could be of help if you are doing an inventory of all the devices that you managed.
Router’s show inventory:
Router#show inventory NAME: "Chassis", DESCR: "Cisco ASR1001-X Chassis" PID: ASR1001-X , VID: V02, SN: NAME: "Power Supply Module 0", DESCR: "Cisco ASR1001-X AC Power Supply" PID: ASR1001-X-PWR-AC , VID: V01, SN: NAME: "Power Supply Module 1", DESCR: "Cisco ASR1001-X AC Power Supply" PID: ASR1001-X-PWR-AC , VID: V01, SN: NAME: "Fan Tray", DESCR: "Cisco ASR1001-X Fan Tray" PID: ASR1001-X-FANTRAY , VID: , SN: NAME: "module 0", DESCR: "Cisco ASR1001-X SPA Interface Processor" PID: ASR1001-X , VID: , SN: NAME: "SPA subslot 0/0", DESCR: "8-port Built-in GE SPA" PID: BUILT-IN-2T+6X1GE , VID: , SN: NAME: "subslot 0/0 transceiver 2", DESCR: "GE T" PID: SP7041-E-R , VID: , SN: NAME: "subslot 0/0 transceiver 3", DESCR: "GE T" PID: SP7041-E-R , VID: , SN: NAME: "subslot 0/0 transceiver 4", DESCR: "GE T" PID: SP7041-E-R , VID: , SN: NAME: "subslot 0/0 transceiver 7", DESCR: "GE LX" PID: GLC-LH-SMD , VID: A , SN: NAME: "module R0", DESCR: "Cisco ASR1001-X Route Processor" PID: ASR1001-X , VID: V02, SN: NAME: "module F0", DESCR: "Cisco ASR1001-X Embedded Services Processor" PID: ASR1001-X , VID: , SN:
Switch’s show inventory
Switch# show inventory NAME: "Chassis", DESCR: "Nexus 3048 Chassis" PID: N3K-C3048TP-1GE , VID: V01 , SN: NAME: "Module 1", DESCR: "48x1GE + 4x10G Supervisor" PID: N3K-C3048TP-1GE , VID: V01 , SN: NAME: "Fan 1", DESCR: "Chassis fan module" PID: N3K-C3048-FAN-B , VID: N/A , SN: NAME: "Power supply 1", DESCR: "AC power supply" PID: N2200-PAC-400W-B , VID: V02 , SN: NAME: "Power supply 2", DESCR: "AC power supply" PID: N2200-PAC-400W-B , VID: V02 , SN:
- show environment
“show environment” command shows the status of each hardware in the device, like the temperature, fan trays, and the power supply. It can also shows if there is a failing power supply, or fans. But the output of this commands differs in platforms
Nexus 3064
Switch# show environment
Fan:
------------------------------------------------------
Fan Model Hw Status
------------------------------------------------------
Fan-1 N3K-C3064-FAN -- ok
PS-1 N2200-PAC-400W -- ok
PS-2 N2200-PAC-400W -- ok
Temperature
-------------------------------------------------------------------------
Module Sensor MajorThresh MinorThres CurTemp Status
(Celsius) (Celsius) (Celsius)
-------------------------------------------------------------------------
1 Back-Right (D0) 55 44 37 ok
1 Back-Left (D1) 53 42 33 ok
1 Front-Right(D2) 56 47 38 ok
1 Front-Left (D3) 57 49 37 ok
Power Supply:
Voltage: 12 Volts
-----------------------------------------------------------
PS Model Input Power Current Status
Type (Watts) (Amps)
-----------------------------------------------------------
1 N2200-PAC-400W AC 396.00 33.00 ok
2 N2200-PAC-400W AC 396.00 33.00 ok
Mod Model Power Current Power Current Status
Requested Requested Allocated Allocated
(Watts) (Amps) (Watts) (Amps)
--- ---------------------- ------- ---------- --------- ---------- ----------
1 N3K-C3064PQ-10GX-SUP 349.20 29.10 349.20 29.10 powered-up
Power Usage Summary:
--------------------
Power Supply redundancy mode: Redundant
Power Supply redundancy operational mode: Redundant
Total Power Capacity 792.00 W
Power reserved for Supervisor(s) 349.20 W
Power currently used by Modules 0.00 W
-------------
Total Power Available 442.80 W
-------------
Cisco Catalyst 6500 Switch#show environment environmental alarms: no alarms backplane: operating clock count: 2 operating VTT count: 3 operating fan count: 1 fan-tray 1: fan-tray 1 type: WS-C6509-E-FAN fan-tray 1 mode: Restricted-power fan-tray 1 fan-fail: OK VTT 1: VTT 1 OK: OK VTT 1 outlet temperature: 27C VTT 2: VTT 2 OK: OK VTT 2 outlet temperature: 24C VTT 3: VTT 3 OK: OK VTT 3 outlet temperature: 31C clock 1: clock 1 OK: OK, clock 1 clock-inuse: in-use clock 2: clock 2 OK: OK, clock 2 clock-inuse: not-in-use power-supply 1: power-supply 1 fan-fail: OK power-supply 1 power-input: AC high power-supply 1 power-output-mode: high power-supply 1 power-output-fail: OK power-supply 2: power-supply 2 fan-fail: OK power-supply 2 power-input: AC high power-supply 2 power-output-mode: high power-supply 2 power-output-fail: OK module 1: module 1 power-output-fail: OK module 1 outlet temperature: 44C module 1 inlet temperature: 20C module 5: module 5 power-output-fail: OK module 5 outlet temperature: 27C module 5 inlet temperature: 22C module 5 device-1 temperature: 31C module 5 device-2 temperature: 32C module 5 asic-1 temperature: 23C module 5 asic-2 temperature: 23C module 5 asic-3 temperature: 23C module 5 asic-4 temperature: 23C module 5 asic-5 temperature: 23C module 5 asic-6 temperature: 23C module 5 RP outlet temperature: 25C module 5 RP inlet temperature: 26C module 5 EARL outlet temperature: 32C module 5 EARL inlet temperature: 21C module 9: module 9 power-output-fail: OK module 9 outlet temperature: 35C module 9 inlet temperature: 21C module 9 device-1 temperature: 22C module 9 device-2 temperature: 29C chassis connector rating: 1302.00 Watts (31.00 Amps @ 42V) chassis auxiliary connector rating: 2016.00 Watts (48.00 Amps @ 42V) module 1 module 1 connector rating: 2016.00 Watts (48.00 Amps @ 42V) module 1 power consumption: 325.50 Watts ( 7.75 Amps @ 42V) module 5 module 5 connector rating: 1260.00 Watts (30.00 Amps @ 42V) module 5 power consumption: 282.24 Watts ( 6.72 Amps @ 42V) module 9 module 9 connector rating: 2016.00 Watts (48.00 Amps @ 42V) module 9 power consumption: 125.16 Watts ( 2.98 Amps @ 42V) chassis per slot cooling capacity: 70 cfm ambient temperature: < 55C module 1 cooling requirement: 70 cfm module 5 cooling requirement: 35 cfm module 9 cooling requirement: 70 cfm
Cisco ASR1001-X Router#show environment Number of Critical alarms: 0 Number of Major alarms: 0 Number of Minor alarms: 0 Slot Sensor Current State Reading ---- ------ ------------- ------- P0 PEM Iout Normal 5 A P0 PEM Vout Normal 12 V DC P0 PEM Vin Normal 229 V AC P0 Temp: PEM In Normal 27 Celsius P0 Temp: PEM Out Normal 24 Celsius P0 Temp: PEM Int Normal 29 Celsius P1 PEM Iout Normal 5 A P1 PEM Vout Normal 12 V DC P1 PEM Vin Normal 226 V AC P1 Temp: PEM In Normal 29 Celsius P1 Temp: PEM Out Normal 27 Celsius P1 Temp: PEM Int Normal 30 Celsius R0 VVM 0: VX1 Normal 1506 mV R0 VVM 0: VX2 Normal 751 mV R0 VVM 0: VX3 Normal 1005 mV R0 VVM 0: VX4 Normal 1057 mV R0 VVM 0: VX5 Normal 899 mV R0 VVM 0: VP1 Normal 5088 mV R0 VVM 0: VP3 Normal 1507 mV R0 VVM 0: VP4 Normal 1795 mV R0 VVM 0: VH Normal 11966 mV R0 VVM 1: VX1 Normal 1197 mV R0 VVM 1: VX2 Normal 824 mV R0 VVM 1: VX3 Normal 857 mV R0 VVM 1: VX4 Normal 996 mV R0 VVM 1: VX5 Normal 874 mV R0 VVM 1: VP2 Normal 3331 mV R0 VVM 1: VP3 Normal 1789 mV R0 VVM 1: VP4 Normal 998 mV R0 VVM 1: VH Normal 11961 mV R0 VVM 2: VX1 Normal 1115 mV R0 VVM 2: VX2 Normal 1106 mV R0 VVM 2: VX3 Normal 1204 mV R0 VVM 2: VX4 Normal 2500 mV R0 VVM 2: VX5 Normal 961 mV R0 VVM 2: VP2 Normal 1534 mV R0 VVM 2: VP3 Normal 1505 mV R0 VVM 2: VP4 Normal 2486 mV R0 VVM 2: VH Normal 11977 mV R0 VVM 2: AUX1 Normal 747 mV R0 VVM 2: AUX2 Normal 752 mV R0 Temp: sTCAM Normal 23 Celsius R0 Temp: Inlet Normal 16 Celsius R0 Temp: Outlet Normal 31 Celsius R0 Temp: QFP Die Normal 33 Celsius R0 Temp: Center Normal 31 Celsius R0 Temp: Oct Die Normal 31 Celsius R0 Temp: CPU Inlt Normal 26 Celsius R0 Temp: CPU VRM Normal 25 Celsius R0 Temp: CPU Die Normal 31 Celsius R0 Temp: FC FANS Fan Speed 60% 16 Celsius P0 Temp: FC FAN0 Fan Speed 60% 16 Celsius P1 Temp: FC FAN1 Fan Speed 60% 16 Celsius
- show logging
“show logging” command shows different messages including errors that could be helpful in troubleshooting if there is a problem in the network. Every logs generated has a corresponding value or severity level. For example, %LINK-3-UPDOWN: Interface GigabitEthernet0/2, changed state to down, the highlighted number which is 3 shows a severity of an Error. Here is the complete list of the severity levels starting from zero:
0 – Emergency
1 – Alert
2 – Critical
3 – Error
4 – Warning
5 – Notice
6- -Informational
7 – Debug
Switch#show logging Jan 23 00:23:00 PHT: %LINEPROTO-SP-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up Feb 24 00:24:00 PHT: %LINK-3-UPDOWN: Interface GigabitEthernet0/2, changed state to down Feb 25 00:25:00 PHT: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/3, changed state to down Mar 26 00:26:00 PHT: %LINK-SP-3-UPDOWN: Interface GigabitEthernet0/4, changed state to down Mar 27 00:27:00 PHT: %LINEPROTO-SP-5-UPDOWN: Line protocol on Interface GigabitEthernet0/5, changed state to down Apr 28 00:28:00 PHT: %LINK-3-UPDOWN: Interface GigabitEthernet0/6, changed state to up
- telnet
“telnet” command can be use to remotely access a device but could also be use in testing if a port is allowed to it. This is useful in troubleshooting if you have problem accessing a service like HTTP or HTTPS in a web server, it could be blocked by a firewall. Note that this cannot be use in routers, switches, but it is also usable in the command line of a PC. In my example, the IP Address provided is of Cisco’s website http://www.cisco.com
Switch#telnet 23.73.198.152 443 Trying 23.73.198.152, 443 ... Open Switch#telnet 23.73.198.152 80 Trying 23.73.198.152, 80 ... Open Switch#telnet 23.73.198.152 21 Trying 23.73.198.152, 21 ... % Connection timed out; remote host not responding
- show version
“show version” command shows a high-level overview of the device that you are in. It shows the up-time of the device, the version of the code that it is running, the number of interfaces it has. This is useful to know if you are looking if the device reboots or reload.
Switch# show version
Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
Documents: http://www.cisco.com/en/US/products/ps9372/tsd_products_support_series_home.html
Copyright (c) 2002-2010, Cisco Systems, Inc. All rights reserved.
The copyrights to certain works contained herein are owned by
other third parties and are used and distributed under license.
Some parts of this software are covered under the GNU Public
License. A copy of the license is available at
http://www.gnu.org/licenses/gpl.html.
Software
BIOS: version 1.2.0
loader: version N/A
kickstart: version 6.0(2)U6(1)
system: version 6.0(2)U6(1)
Power Sequencer Firmware:
Module 1: version v4.4
BIOS compile time: 08/25/2011
kickstart image file is: bootflash:///n3000-uk9-kickstart.3.0.2.U6.1.bin
kickstart compile time: 4/9/2015 23:00:00 [04/10/2015 00:51:22]
system image file is: bootflash:///n3000-uk9.6.0.2.U6.1.bin
system compile time: 4/9/2015 23:00:00 [04/10/2015 01:23:51]
Hardware
cisco Nexus 3048 Chassis ("48x1GE + 4x10G Supervisor")
Intel(R) Celeron(R) CPU P450 with 3665224 kB of memory.
Processor Board ID
Device name: Switch
bootflash: 1007040 kB
Kernel uptime is 37 day(s), 8 hour(s), 32 minute(s), 15 second(s)
Last reset
Reason: Unknown
System version: 6.0(2)U6(1)
Service:
plugin
Core Plugin, Ethernet Plugin
That’s it! I hope this post is of use to you especially if you are new to your work. And if you think there are commands that had been of use to you especially in troubleshooting please comment in below.
A Packet's Journey: One Hop At A Time 