Cisco All In One router and switch command Quick Reference

Cisco Command Cheat Sheet

 

ROUTER COMMANDS :

• Config# terminal editing - allows for enhanced editing commands
• Config# terminal monitor - shows output on telnet session
• Config# terminal ip netmask-format hexadecimal|bit-count|decimal - changes the format of subnet masks

BANNER:

• Config# banner motd # TYPE MESSAGE HERE # 

CHANGING THE REGISTER:

• Config# config-register 0×2100 - ROM Monitor Mode
• Config# config-register 0×2101 - ROM boot
• Config# config-register 0×2102 - Boot from NVRAM

HOST NAME:

• Config# hostname

BOOT SYSTEM:

• Config# boot system tftp  
• Example: boot system tftp c2600-i-mz.122-5a.bin 192.168.0.1
• Config# boot system ROM
• Config# boot system flash - Then - 
• Config# reload

HOST TABLE:

• Config# ip host ROUTER_NAME INT_Address - Example: ip host lab-a 192.168.5.1
  -or-
• Config# ip host RTR_NAME INT_ADD1 INT_ADD2 INT_ADD3 - Example: ip host lab-a 192.168.5.1 203.23.4.2 199.2.3.2 - (for e0, s0, s1)

DOMAIN NAME SERVICES:

• Config# ip domain-lookup - Tell router to lookup domain names
• Config# ip name-server 122.22.2.2 - Location of DNS server
• Config# ip domain-name cisco.com - Domain to append to end of names

STATIC ROUTES:

• Config# ip route Net_Add SN_Mask Next_Hop_Add 

          Example: ip route 192.168.15.0 255.255.255.0 205.5.5.2

• Config# ip route 0.0.0.0 0.0.0.0 Next_Hop_Add - Default route
  -or-
• Config# ip default-network Net_Add - Gateway LAN network

IP ROUTING:

• Config# ip routing - Enabled by default
• Config# router rip
  -or-
• Config# router igrp 100
• Config# interface Ethernet 0
• Config-if# ip address 122.2.3.2 255.255.255.0
• Config-if# no shutdown

IPX ROUTING:

• Config# ipx routing
• Config# interface Ethernet 0
• Config# ipx maximum-paths 2 - Maximum equal metric paths used
• Config-if# ipx network 222 encapsulation sap - Also Novell-Ether, SNAP, ARPA on Ethernet. Encapsulation HDLC on serial
• Config-if# no shutdown

ACCESS LISTS:

IP Standard	1-99
IP Extended	100-199
IPX Standard	800-899
IPX Extended	900-999
IPX SAP Filters	1000-1099

IP STANDARD:

• Config# access-list 10 permit 133.2.2.0 0.0.0.255 - allow all src ip’s on network 133.2.2.0
  -or-
• Config# access-list 10 permit host 133.2.2.2 - specifies a specific host
  -or-
• Config# access-list 10 permit any - allows any address
• Config# int Ethernet 0
• Config-if# ip access-group 10 in - also available: out

IP EXTENDED:

• Config# access-list 101 permit tcp 133.12.0.0 0.0.255.255 122.3.2.0 0.0.0.255 eq telnet
  -protocols: tcp, udp, icmp, ip (no sockets then), among others
  -source then destination address
  -eq, gt, lt for comparison
  -sockets can be numeric or name (23 or telnet, 21 or ftp, etc)
  -or-
• Config# access-list 101 deny tcp any host 133.2.23.3 eq www

-or-

• Config# access-list 101 permit ip any any
• Config# interface Ethernet 0
• Config-if# ip access-group 101 outIPX STANDARD:
• Config# access-list 801 permit 233 AA3 - source network/host then destination network/host

-or-

• Config# access-list 801 permit -1 -1 - “-1″ is the same as “any” with network/host addresses
• Config# interface Ethernet 0
• Config-if# ipx access-group 801 outIPX EXTENDED:
• Config# access-list 901 permit sap 4AA all 4BB all
  - Permit protocol src_add socket dest_add socket
  -”all” includes all sockets, or can use socket numbers

-or-

• Config# access-list 901 permit any any all any all
  -Permits any protocol with any address on any socket to go anywhere
• Config# interface Ethernet 0
• Config-if# ipx access-group 901 inIPX SAP FILTER:
• Config# access-list 1000 permit 4aa 3 - “3″ is the service type

-or-

• Config# access-list 1000 permit 4aa 0 - service type of “0″ matches all services
• Config# interface Ethernet 0
• Config-if# ipx input-sap-filter 1000 - filter applied to incoming packets

-or-

• Config-if# ipx output-sap-filter 1000 - filter applied to outgoing packets

NAMED ACCESS LISTS:

• Config# ip access-list standard LISTNAME
  -can be ip or ipx, standard or extended
  -followed by the permit or deny list
• Config# permit any
• Config-if# ip access-group LISTNAME in
  -use the list name instead of a list number
  -allows for a larger amount of access-lists

PPP SETUP:

• Config-if# encapsulation ppp
• Config-if# ppp authentication chap pap
  -order in which they will be used
  -only attempted with the authentification listed
  -if one fails, then connection is terminated
• Config-if# exit
• Config# username Lab-b password 123456
  -username is the router that will be connecting to this one
  -only specified routers can connect

-or-

• Config-if# ppp chap hostname ROUTER
• Config-if# ppp chap password 123456
  -if this is set on all routers, then any of them can connect to any other
  -set same on all for easy configuration

ISDN SETUP:

• Config# isdn switch-type basic-5ess - determined by telecom
• Config# interface serial 0
• Config-if# isdn spid1 2705554564 - isdn “phonenumber” of line 1
• Config-if# isdn spid2 2705554565 - isdn “phonenumber” of line 2
• Config-if# encapsulation PPP - or HDLC, LAPD

DDR - 4 Steps to setting up ISDN with DDR Configure switch type

1. Config# isdn switch-type basic-5ess - can be done at interface config

2. Configure static routes
Config# ip route 123.4.35.0 255.255.255.0 192.3.5.5 - sends traffic destined for 123.4.35.0 to 192.3.5.5
Config# ip route 192.3.5.5 255.255.255.255 bri0 - specifies how to get to network 192.3.5.5 (through bri0)

3. Configure Interface
Config-if# ip address 192.3.5.5 255.255.255.0
Config-if# no shutdown
Config-if# encapsulation ppp
Config-if# dialer-group 1 - applies dialer-list to this interface
Config-if# dialer map ip 192.3.5.6 name Lab-b 5551212
connect to lab-b at 5551212 with ip 192.3.5.6 if there is interesting traffic
can also use “dialer string 5551212″ instead if there is only one router to connect to

4. Specify interesting traffic
Config# dialer-list 1 ip permit any
-or-
Config# dialer-list 1 ip list 101 - use the access-list 101 as the dialer list

5. Other Options
Config-if# hold-queue 75 - queue 75 packets before dialing
Config-if# dialer load-threshold 125 either
-load needed before second line is brought up
-”125″ is any number 1-255, where % load is x/255 (ie 125/255 is about 50%)
-can check by in, out, or either

Config-if# dialer idle-timeout 180
-determines how long to stay idle before terminating the session
-default is 120

FRAME RELAY SETUP:

• Config# interface serial 0
• Config-if# encapsulation frame-relay - cisco by default, can change to ietf
• Config-if# frame-relay lmi-type cisco - cisco by default, also ansi, q933a
• Config-if# bandwidth 56
• Config-if# interface serial 0.100 point-to-point - subinterface
• Config-if# ip address 122.1.1.1 255.255.255.0
• Config-if# frame-relay interface-dlci 100
  -maps the dlci to the interface
  -can add BROADCAST and/or IETF at the end
• Config-if# interface serial 1.100 multipoint
• Config-if# no inverse-arp - turns IARP off; good to do
• Config-if# frame-relay map ip 122.1.1.2 48 ietf broadcast
  -maps an IP to a dlci (48 in this case)
  -required if IARP is turned off
  -ietf and broadcast are optional
• Config-if# frame-relay map ip 122.1.1.3 54 broadcast

SHOW COMMANDS

• Show access-lists - all access lists on the router
• Show cdp - cdp timer and holdtime frequency
• Show cdp entry * - same as next
• Show cdp neighbors detail - details of neighbor with ip add and ios version
• Show cdp neighbors - id, local interface, holdtime, capability, platform portid
• Show cdp interface - int’s running cdp and their encapsulation
• Show cdp traffic - cdp packets sent and received
• Show controllers serial 0 - DTE or DCE status
• Show dialer - number of times dialer string has been reached, other stats
• Show flash - files in flash
• Show frame-relay lmi - lmi stats
• Show frame-relay map - static and dynamic maps for PVC’s
• Show frame-relay pvc - pvc’s and dlci’s
• Show history - commands entered
• Show hosts - contents of host table
• Show int f0/26 - stats of f0/26
• Show interface Ethernet 0 - show stats of Ethernet 0
• Show ip - ip config of switch
• Show ip access-lists - ip access-lists on switch
• Show ip interface - ip config of interface
• Show ip protocols - routing protocols and timers
• Show ip route - Displays IP routing table
• Show ipx access-lists - same, only ipx
• Show ipx interfaces - RIP and SAP info being sent and received, IPX addresses
• Show ipx route - ipx routes in the table
• Show ipx servers - SAP table
• Show ipx traffic - RIP and SAP info
• Show isdn active - number with active status
• Show isdn status - shows if SPIDs are valid, if connected
• Show mac-address-table - contents of the dynamic table
• Show protocols - routed protocols and net_addresses of interfaces
• Show running-config - dram config file
• Show sessions - connections via telnet to remote device
• Show startup-config - nvram config file
• Show terminal - shows history size
• Show trunk a/b - trunk stat of port 26/27
• Show version - ios info, uptime, address of switch
• Show vlan - all configured vlan’s
• Show vlan-membership - vlan assignments
• Show vtp - vtp configs

CATALYST COMMANDS
For Native IOS - Not CatOS

SWITCH ADDRESS:

• Config# ip address 192.168.0.2 255.255.255.0
• Config# ip default-gateway 192.168.0.1 
• Config# interface Ethernet 0/5 - “fastethernet” for 100 Mbps ports
• Config-if# duplex full 

SWITCHING MODE:

• Config# switching-mode store-and-forward - also, fragment-free

MAC ADDRESS CONFIGS:

• Config# mac-address-table permanent aaab.000f.ffef e0/2 - only this mac will work on this port
• Config# mac-address-table restricted static aaab.000f.ffef e0/2 e0/3
  -port 3 can only send data out port 2 with that mac
  -very restrictive security
• Config-if# port secure max-mac-count 5 - allows only 5 mac addresses mapped to this port

VLANS:

• Config# vlan 10 name FINANCE
• Config# interface Ethernet 0/3
• Config-if# vlan-membership static 10TRUNK LINKS:
• Config-if# trunk on - also, off | auto | desirable | nonegotiate
• Config-if# no trunk-vlan 2
  -removes vlan 2 from the trunk port
  -by default, all vlans are set on a trunk port CONFIGURING VTP:
  
• Config# delete vtp - should be done prior to adding to a network
• Config# vtp server - the default is server, also client and transparent
• Config# vtp domain Camp - name doesn’t matter, just so all switches use the same
• Config# vtp password 1234 - limited security
• Config# vtp pruning enable - limits vtp broadcasts to only switches affected
• Config# vtp pruning disableFLASH UPGRADE:
• Config# copy tftp://192.168.5.5/configname.ios opcode - “opcode” for ios upgrade, “nvram” for startup config

DELETE STARTUP CONFIG:

• Config# delete nvram