As a Network Engineer you must know some useful "Show" Commands so as to know what exactly is going on your device and get information regarding the device.
Cisco CLI Commands show relevant information regarding configuration and operation of the device.
Let's checkout 10 " Show "Commands an Network Engineer Must Know !!!!!!
Tell us what is the current configuration running on the device.
R1#sh running-config
Building configuration...
Current configuration : 1404 bytes
!
! No configuration change since last restart
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
no ip icmp rate-limit unreachable
ip cef
!
!
no ip domain lookup
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
--More--
The uptime of the device.
Configuration -Register of the device.
The Serial Number of the device.
R1#sh version
Cisco IOS Software, C1700 Software (C1700-ADVENTERPRISEK9-M), Version 12.4(25d), RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Wed 18-Aug-10 03:53 by prod_rel_team
ROM: ROMMON Emulation Microcode
ROM: C1700 Software (C1700-ADVENTERPRISEK9-M), Version 12.4(25d), RELEASE SOFTWARE (fc1)
R1 uptime is 4 minutes
System returned to ROM by unknown reload cause - suspect boot_data[BOOT_COUNT] 0x0, BOOT_COUNT 0, BOOTDATA 19
System restarted at 21:30:44 UTC Fri Jun 21 2019
System image file is "tftp://255.255.255.255/unknown"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
export@cisco.com.
Cisco 1720 (MPC860T) processor (revision 0x202) with 139264K/8192K bytes of memory.
Processor board ID FTX0945W0MY (4279256517), with hardware revision 0000
MPC860T processor: part number 0, mask 0
1 FastEthernet interface
4 Serial(sync/async) interfaces
128K bytes of NVRAM.
4096K bytes of processor board System flash (Read/Write)
Configuration register is 0x2102
Give us the information regarding all the interfaces of device stating the current status and ip address information for the same.
R1#sh ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0 unassigned YES NVRAM administratively down down
Loopback0 100.0.0.1 YES NVRAM up up
Serial0 12.0.0.1 YES NVRAM up up
Serial1 13.0.0.1 YES NVRAM up up
Serial2 unassigned YES NVRAM administratively down down
Serial3 unassigned YES NVRAM administratively down down
Provides Layer 1 i.e Physical Layer and Layer 2 i.e Data Link Layer information.
Show the Description , MTU, Bandwidth , Reliability,Encapsulation.
Inbound and Outbound Utilization on the interface.
Packets related information,
Errors , CRC ,Drops etc.
R1#sh int Serial0
Serial0 is up, line protocol is up
Hardware is PowerQUICC Serial
Description: connection to R2
Internet address is 12.0.0.1/24
MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:05, output 00:00:03, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1158 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
202 packets input, 13622 bytes, 0 no buffer
Received 161 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
206 packets output, 13880 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
R1#sh int des
Interface Status Protocol Description
Fa0 admin down down
Lo0 up up
Se0 up up connection to R2
Se1 up up connection to R3
Se2 admin down down
Se3 admin down down
6) show ip route
This command show the routing table of the Router
R1#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
34.0.0.0/24 is subnetted, 1 subnets
B 34.0.0.0 [20/0] via 12.0.0.2, 00:24:13
100.0.0.0/24 is subnetted, 1 subnets
C 100.0.0.0 is directly connected, Loopback0
24.0.0.0/24 is subnetted, 1 subnets
B 24.0.0.0 [20/0] via 12.0.0.2, 00:24:13
12.0.0.0/24 is subnetted, 1 subnets
C 12.0.0.0 is directly connected, Serial0
13.0.0.0/24 is subnetted, 1 subnets
C 13.0.0.0 is directly connected, Serial1
R1#sh ip protocols
Routing Protocol is "bgp 100"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
IGP synchronization is disabled
Automatic route summarization is disabled
Neighbor(s):
Address FiltIn FiltOut DistIn DistOut Weight RouteMap
12.0.0.2
13.0.0.3
Maximum path: 1
Routing Information Sources:
Gateway Distance Last Update
12.0.0.2 20 00:24:45
Distance: external 20 internal 200 local 200
Also shows the interfaces which are members of the respective vlans
Switch#sh vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/16, Fa0/17, Fa0/18, Fa0/19
Fa0/20, Fa0/21, Fa0/22, Fa0/23
Fa0/24, Gig0/1, Gig0/2
10 DATA active Fa0/5, Fa0/6, Fa0/7, Fa0/8
20 VOICE active Fa0/9, Fa0/10
80 WIFI active Fa0/11, Fa0/12, Fa0/13, Fa0/14
Fa0/15
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
10 enet 100010 1500 - - - - - 0 0
20 enet 100020 1500 - - - - - 0 0
80 enet 100080 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
Remote SPAN VLANs
------------------------------------------------------------------------------
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
Switch#sh interfaces trunk
Port Mode Encapsulation Status Native vlan
Fa0/3 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/3 10,20
Port Vlans allowed and active in management domain
Fa0/3 10,20
Port Vlans in spanning tree forwarding state and not pruned
Fa0/3 20
Provides IP address, interface , Model , IOS version of the neighboring
Switch#sh cdp neighbors detail
Device ID: Router
Entry address(es):
Platform: cisco ISR4300, Capabilities: Router
Interface: FastEthernet0/3, Port ID (outgoing port): GigabitEthernet0/0/0
Holdtime: 165
Version :
Cisco IOS XE Software, Version 03.13.04.S - Extended Support Release
Cisco IOS Software, ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 15.5(3)S5, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2017 by Cisco Systems, Inc.
Compiled Mon 05-Oct-15 11:24 by mcpre
advertisement version: 2
Duplex: full
Hope you all will find the post useful
Cisco CLI Commands show relevant information regarding configuration and operation of the device.
Let's checkout 10 " Show "Commands an Network Engineer Must Know !!!!!!
 |
| 10 show commands Network Engineer Must Know |
1) show running-configuration
Tell us what is the current configuration running on the device.
R1#sh running-config
Building configuration...
Current configuration : 1404 bytes
!
! No configuration change since last restart
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
no ip icmp rate-limit unreachable
ip cef
!
!
no ip domain lookup
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!
!
--More--
2)show version
Tells us what is the software and hardware details of the devices.The uptime of the device.
Configuration -Register of the device.
The Serial Number of the device.
R1#sh version
Cisco IOS Software, C1700 Software (C1700-ADVENTERPRISEK9-M), Version 12.4(25d), RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Wed 18-Aug-10 03:53 by prod_rel_team
ROM: ROMMON Emulation Microcode
ROM: C1700 Software (C1700-ADVENTERPRISEK9-M), Version 12.4(25d), RELEASE SOFTWARE (fc1)
R1 uptime is 4 minutes
System returned to ROM by unknown reload cause - suspect boot_data[BOOT_COUNT] 0x0, BOOT_COUNT 0, BOOTDATA 19
System restarted at 21:30:44 UTC Fri Jun 21 2019
System image file is "tftp://255.255.255.255/unknown"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
export@cisco.com.
Cisco 1720 (MPC860T) processor (revision 0x202) with 139264K/8192K bytes of memory.
Processor board ID FTX0945W0MY (4279256517), with hardware revision 0000
MPC860T processor: part number 0, mask 0
1 FastEthernet interface
4 Serial(sync/async) interfaces
128K bytes of NVRAM.
4096K bytes of processor board System flash (Read/Write)
Configuration register is 0x2102
3)show ip interface brief
This commands is the most useful command,Give us the information regarding all the interfaces of device stating the current status and ip address information for the same.
R1#sh ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0 unassigned YES NVRAM administratively down down
Loopback0 100.0.0.1 YES NVRAM up up
Serial0 12.0.0.1 YES NVRAM up up
Serial1 13.0.0.1 YES NVRAM up up
Serial2 unassigned YES NVRAM administratively down down
Serial3 unassigned YES NVRAM administratively down down
4) show interface
This command is a very popular command.Provides Layer 1 i.e Physical Layer and Layer 2 i.e Data Link Layer information.
Show the Description , MTU, Bandwidth , Reliability,Encapsulation.
Inbound and Outbound Utilization on the interface.
Packets related information,
Errors , CRC ,Drops etc.
R1#sh int Serial0
Serial0 is up, line protocol is up
Hardware is PowerQUICC Serial
Description: connection to R2
Internet address is 12.0.0.1/24
MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:05, output 00:00:03, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1158 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
202 packets input, 13622 bytes, 0 no buffer
Received 161 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
206 packets output, 13880 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
5) show interface description
This command provides us with the status and description of all the interfaceR1#sh int des
Interface Status Protocol Description
Fa0 admin down down
Lo0 up up
Se0 up up connection to R2
Se1 up up connection to R3
Se2 admin down down
Se3 admin down down
6) show ip route
This command show the routing table of the Router
R1#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
34.0.0.0/24 is subnetted, 1 subnets
B 34.0.0.0 [20/0] via 12.0.0.2, 00:24:13
100.0.0.0/24 is subnetted, 1 subnets
C 100.0.0.0 is directly connected, Loopback0
24.0.0.0/24 is subnetted, 1 subnets
B 24.0.0.0 [20/0] via 12.0.0.2, 00:24:13
12.0.0.0/24 is subnetted, 1 subnets
C 12.0.0.0 is directly connected, Serial0
13.0.0.0/24 is subnetted, 1 subnets
C 13.0.0.0 is directly connected, Serial1
7) show ip protocols
This command tells us the routing protocols currently running on the router.R1#sh ip protocols
Routing Protocol is "bgp 100"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
IGP synchronization is disabled
Automatic route summarization is disabled
Neighbor(s):
Address FiltIn FiltOut DistIn DistOut Weight RouteMap
12.0.0.2
13.0.0.3
Maximum path: 1
Routing Information Sources:
Gateway Distance Last Update
12.0.0.2 20 00:24:45
Distance: external 20 internal 200 local 200
8) show vlan
This commands show the details of the vlans configured on the device.Also shows the interfaces which are members of the respective vlans
Switch#sh vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/16, Fa0/17, Fa0/18, Fa0/19
Fa0/20, Fa0/21, Fa0/22, Fa0/23
Fa0/24, Gig0/1, Gig0/2
10 DATA active Fa0/5, Fa0/6, Fa0/7, Fa0/8
20 VOICE active Fa0/9, Fa0/10
80 WIFI active Fa0/11, Fa0/12, Fa0/13, Fa0/14
Fa0/15
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
10 enet 100010 1500 - - - - - 0 0
20 enet 100020 1500 - - - - - 0 0
80 enet 100080 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
Remote SPAN VLANs
------------------------------------------------------------------------------
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
9) show interface trunk
This commands quickly tells us which all interfaces on the switch are configured as trunk and the vlans allowed on the same.Switch#sh interfaces trunk
Port Mode Encapsulation Status Native vlan
Fa0/3 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/3 10,20
Port Vlans allowed and active in management domain
Fa0/3 10,20
Port Vlans in spanning tree forwarding state and not pruned
Fa0/3 20
10) show cdp neighbor details
This commands shows the connected cisco devices .Provides IP address, interface , Model , IOS version of the neighboring
Switch#sh cdp neighbors detail
Device ID: Router
Entry address(es):
Platform: cisco ISR4300, Capabilities: Router
Interface: FastEthernet0/3, Port ID (outgoing port): GigabitEthernet0/0/0
Holdtime: 165
Version :
Cisco IOS XE Software, Version 03.13.04.S - Extended Support Release
Cisco IOS Software, ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 15.5(3)S5, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2017 by Cisco Systems, Inc.
Compiled Mon 05-Oct-15 11:24 by mcpre
advertisement version: 2
Duplex: full
Hope you all will find the post useful
No comments:
Post a Comment