Cisco Commands Quick Ref
en (enable) - enable mode
conf t (conf term) - config mode

int s0
int s1
int e0
int e1
int fddi0/0
int hssi1/0

no ip route 192.231.42.0 255.255.255.0 166.90.118.122 - Network IP / Subnet / Remote Serial IP
no shut - to enable serial interface
no enable secret - to disable enable secret
no ip route-cache -
no fair-queue -
ip classless -
ip subnet-zero - allows use of the first IP block of a subnetted class C, i.e. 205.158.3.0
ip route xxx.xxx.xxx.xxx 255.255.255.xxx null0 -

ctrl z - end config mode
wr t - display running config to screen without saving changes to nvram
wr (write mem) - write running config / changes to nvram

sho int s0 - show serial interface 0
sho int s1 - show serial interface 1

sho int e0 - show Ethernet interface 0
sho int e1 - show Ethernet interface 1

sho ip route - shows all routes
sho ip route 192.231.42.1 - show where this router learned this IP only
sho ip bgp xxx.xx.xx.x -
sho conf - must be in "enable" mode if telneted into router
sho arp - displays all IP's active on Ethernet interface
sho access-list -
sho controller cx bus -
sho run -
sho start -

sho frame pvc -
sho frame lmi -

sho int s0 - watch "Load 1/255" - input and output que drops,
sho buffers -
sho proc (show processor) - show processor utilage
sho proc mem (show processor memory) - watch available memory when less then 1MB
sho log - display error log history
sho ntp assoc -

clear counters - clear all counters on every interface
clear counter s4/2 - clear counters only on interface "s4/2"

ping "serial interface IP" -
ping - "target IP" - Repeat count "500" - Datagram size "750"
ping - "target IP" - Repeat count "3" - Sweep range of sizes "y" - Sweep max size "1500"

sho flash - display system flash memory size
sho hardware - display IOS ver, Bootstrap ver, DRAM size (i.e. 1024kx1024k=2MB), system flash mem size
sho ver - show version

debug serial interface -
debug serial events -

sho ip eigrp topology -
sho ip eigrp neighbors -
sho ip route eigrp -

ctrl shift 6 - to break ping or traceroute
ctrl break - ??? durring boot up stops router from booting to ???
reload - ??? think it reboots router
write erase - ??? think this blows away config in nvram

2501 - to handle two T1's... needs to have minimum 4MB flash mem and 2MB DRAM for IP only
2501 - Enterprise needs to have minimum 8MB Flash and 6MB DRAM memory

Suggestions... Send to: charly@skunk.net