Cisco CLI Flashcards by Ariel Tejada

How to enter priviledged EXEC mode ?
How to enter global configuration mode ?

SWI>enable
SWI#configure terminal

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How to create a password on Cisco device ?

enable password [pass]

enable secret [pass]

(more secure and takes precedence over enable password)

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How to display running and starting configuration ?

show ____-config
show running-config
show startup-config

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How to save configuration ?

1 “write”
2 “write memory”
3 “copy running-config startup-config”

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How to encrypt passwords ?

service password-encryption
(Encrypts current and future passwords. Uses Cisco proprietary type 7 encryption. Not secure can be cracked)

enable secret _____
(more secure. Uses MD5 encryption, harder to crack. Passwords are always encrypted)

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How to remove a command ?

type “no” in front of command you want to remove (global config mode)

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You use the […] keyword to execute privileged EXEC commands in global configuration mode.

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How to change hostname of Cisco device ?

hostname [name]

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How to view mac address table ?

show mac address-table

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How to clear mac address table ?

clear mac address-table dynamic

clear mac address-table dynamic interface (mac or port)

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How to view interface info on router ?

show ip interface breif

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How to configure interface on router ?

interface (interface)

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How to manually set ip address for interface ?

ip address (IP address) (subnet mask)

no shutdown

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How to configure interfaces in a range ?

interface range (range)

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How to configure router static path to next hop ?

ip route (ip address) (netmask) (next hop ip address)

ip route (ip address) (netmask) (exit interface)

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Cisco Default Serial Connection Setting

Speed (baud): 9600
Data bits: 8
Stop Bits: 1
Parity: None
Flow Control: None

How can you view all the availible commands in your current user mode ?

type ‘?’ in the CLI

How to configure a VLAN ?

vlan [vlan-id ]

show VLAN status ?

show vlan brief

What is portfast?
How to enable portfast on an interface?
How to enable it on all (access) ports?

Portfast should only be configured on ports connected to a host (PC). It will only work on an access port. It bypasses the ‘Listening’ and ‘Learning’ stage of STP going straight to a forwarding state.

SWI(config)#interface g0/0
SWI(config-if)#spanning-tree portfast

SWI(config)#spanning-tree portfast default

What is BPDUGuard ?
How to enable bpduguard on an interface?
How to enable it on all (access) ports?

BPDUGuard is an extra safe guard on the port. If a port with BPDUGuard recieves a BPDU from another switch, the interface will shutdown to prevent a loop from forming.

SWI(config)#interface g0/0
SWI(config-if)#spanning-tree bpduguard enable

SWI(config)#spanning-tree portfast bpduguard default

How to set a primary and secondary root bridge manually in different VLANs ?

SWI(config)#spanning-tree vlan 1 root primary
SWI(config)#spanning-tree vlan 2 root secondary

(What really happens behind the scenes is that the priority of the bridges are changed)
SWI(config)#spanning-tree vlan 1 priority 28672

How to set a spaning tree link type on an interface ?

SWI(config-if)#spanning-tree link-type [type]
point-to-point (full duplex)
shared
edge (portfast enabled)

How to check EtherChannel load balance method ?
How to change it ?

ASWI#show etherchannel load-balance

ASWI(config)#port-channel load-balance [type]
dst-ip / dst-mac / src-dst-ip / src-dst-mac / src-ip / src-mac

How to configure etherchannel modes ?

ASWI(config-if-range)#channel-group [group] mode [mode] active (LACP) / auto (PAgP if detected) / desirable (PAgP) / on (etherchannel only) / passive (LACP if detected) to configure etherchannel on routed ports first configure the ports to be routed ports then assign the IP address to the port-channel. ASWI(config-if-range)#no switchport ASWI(config-if-range)#channel-group 1 mode [mode] ASWI(config-if-range)#interface po1 ASWI(config-if)#ip address [IP] [subnet]

Show info on the etherchannel

ASWI#show etherchannel summary ASWI#show etherchannel port-channel

How to enable RIP Routing protocol on router ?

R1(config)#router rip R1(config-router)#version 2 R1(config-router)#no auto-summary (prevents classful addressing) R1(config-router)#network [classful network] (tells the router which interfaces to activate RIP on) R1(config-router)#passive-interface [int not connected to RIP neighbors] R1(config-router)#default-information originate (advertise default route)

How to view the routing protocol being used ?

R1#show ip protocols

How to enable EIGRP ?

R1(config)#router eigrp [AS number] R1(config-router)#no auto-summary (prevents classful addressing) R1(config-router)#passive-interface [int not connected to RIP neighbors] R1(config-router)#network [classful network] (tells the router which interfaces to activate RIP on) R1(config-router)#default-information originate (advertise default route)

How to make a loopback interface ?

R1(config)#interface loopback [num] R1(config-if)#ip address [IP] [/32]

How to configure OSPF ?

R1(config)#router ospf [ID] (can be any number, only locally significant) R1(config-router)#network [IP] [wildcard] area [area num] can also enable on interface R1(config)#interface [interface] R1(config-if)#ip ospf [id] area [area] R1(config-router)#passive-interface [interface] (tells router to stop sending ospf hello messages out of a specific interface) R1(config-router)#default-information originate (advertise default route)

View OSPF information

R1#show ip protocols R1#show ip ospf database R1#show ospf neighbors R1#show ospf interface

How to change the reference bandwidth for OSPF cost ? On an interface ?

R1(config-router)#auto-cost reference-bandwidth [Mbps] (should configure the same bandwidth on all OSPF routers in the network) R1(config)#interface [interface] R1(config-if)#ip ospf cost [Mbps]

Command to enable IPv6 Routing on a router ?

R1(config)#ipv6 unicast-routing R1(config)#int [interface] R1(config-if)#ipv6 address [address/mask] R1(config-if)#no shutdown

How to apply an access control list to an interface ?

R1(config-if)#ip access-group [number] {in / out}

How to create Standard Named Access Lists ?

R1(config)#ip access-list standard [acl-name] R1(config-std-nacl)#[number] {allow / deny} [IP] [wildcard]