IOS commands to do global configuration.

#configure terminal         (go into global config mode)

hostname routersNewName    (change name)

prompt %h:%n%p%s           (set prompt: hostname line# promptChar space)

banner motd  #This is the pre-login banner temporary message#
banner login #This is the pre-login banner permanent message#
banner exec  #This is the post-login banner message#

enable secret myNewPassword      (secure hashed enable password)
enable password myEasilyCrackedPassword   (why have it: older IOS)

clock timezone ZONE HOURS        (e.g. EST -5   JST 9) 
#clock set 13:34:00 23 may 2007  (set clock in enable mode)
ntp server 123.123.123.123      (enable NTP client, indicate server)

cdp run      (enable CDP. is default)

config-register 0xhhhh           (set the configuration register.
                0x2102 normal IOS boot
                0x2142 IOS boot but ignore NVRAM's startup-config: password recovery
                0x2100 ROMMON boot: diagnostics
                0x2101 RxBOOT boot: get new IOS from net

snmp-server community NAME MODE  (enable SNMP client. community NAME
                                  string, MODE RO/RW. Can add ACL #)


#debug ip packet          
#debug ip icmp
#debug ip routing       (routing table events)
#debug ip rip
#debug igrp events
#debug igrp transactions

#undebug all  (turn off all debugging)


ip classless     (enable classless routing, i.e. supernetting)

ip route NET MASK NEXTHOP-IP    (static route: use nexthop for packets going to net
ip route NET MASK INT           (outgoing interface on point-to-point link)

ip route 0.0.0.0 0.0.0.0 ISP_IP    #default route to ISP  S* "candidate default"


ip subnet-zero       (enables use of the zero subnet. 12.X default)

ip host NAME IPaddress      (static hostname to IP)

ip name-server IPaddress    (DNS server's IP address)
no ip domain-lookup         (disable DNS lookup to save time)

no ip source-route    (disable routing of source-routed packets,
                       i.e. packet that contains list of hops)

ip default-gateway IPaddress    (if routing disabled: no ip routing)
ip default-network ???


alias exec s Some Cmd Here   #make alias 's'