Here you can find a collection of undocumented (not on Cisco Dokumentation CD or in online help) IOS commands:

csim
show interfacetching
show ip ospf statistics
debug ip ospf monitor
ttcp
if-con
no snmp-server sparse-tables
who
show region
ps -c
quit
test aaa group radius
list of more and more undocumented commands
If you know more undocumented IOS commands for this collection, please send me a e-mail.

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With the command csim you can emulate a voice call. It′s like sombody calls the specified number. Usefull, if you don′t have physically access to telephone:
Sucessfull call:

wg1r1#csim start 089150
csim: called number = 089150, loop count = 1 ping count = 0
csim err csimDisconnected recvd DISC cid(21)
csim: loop = 1, failed = 1
csim: call attempted = 1, setup failed = 1, tone failed = 0

Call to a not defined number:

wg1r1#csim start 089151
csim: called number = 089151, loop count = 1 ping count = 0

csim err:csim_do_test Error peer not found

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With show interfacetching you can see in detail, which protocols are process, fast or elsewheretched. It′s helpfull for traffic engineering:
wg1r1#sh interfacestching
Ethernet0/0
Throttle count 0
Drops RP 0 SP 0
SPD Flushes Fast 0 SSE 0
SPD Aggress Fast 0
SPD Priority Inputs 5700 Drops 0

Protocol Path Pkts In Chars In Pkts Out Chars Out
Other Process 8821 983982 7806 468360
Cache misses 0
Fast 0 0 0 0
Auton/SSE 0 0 0 0
IP Process 32228 3339712 5786 611402
Cache misses 0
Fast 92667 8980418 133414 189720295
Auton/SSE 0 0 0 0
DEC MOP Process 0 0 130 10010
Cache misses 0
Fast 0 0 0 0
Auton/SSE 0 0 0 0
ARP Process 6440 386380 195 11700
Cache misses 0
Fast 0 0 0 0
Auton/SSE 0 0 0 0
CDP Process 0 0 1302 404922
Cache misses 0
Fast 0 0 0 0
Auton/SSE 0 0 0 0

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With show ip ospf statistics you get detail informations about OSPF SPF. You can see the reasons for SPF and the calculation times:
London#show ip ospf statistic
Area 0: SPF algorithm executed 15 times

SPF calculation time
Delta T Intra D-Intra Summ D-Summ Ext D-Ext Total Reason
00:45:02 32 0 0 0 0 0 36 R,
00:41:00 28 0 0 0 0 0 28 R, N,
00:40:50 28 0 0 0 0 0 28 R,
00:38:13 28 0 0 0 4 0 32 R, X
00:34:18 24 0 0 0 4 0 32 R, N,SN,SA,X
00:07:37 24 0 0 0 0 0 36 R,
00:05:18 308 0 4 0 28 0 356 R,
00:04:05 24 0 0 0 4 0 28 R,
00:01:31 24 0 4 0 0 0 36 R,
00:01:21 24 0 0 4 0 0 36 R,

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With debug ip ospf monitor you can monitor the OSPF SPF.
London#deb ip ospf monitor

OSPF spf monitoring debugging is on
2d04h: OSPF: 192.168.181.2 address 192.168.181.193 on TokenRing0 is dead, state DOWN
2d04h: OSPF: Schedule SPF in area 0
Change in LS ID 0.0.0.0, LSA type R,
2d04h: OSPF: schedule SPF: spf_time 0ms wait_interval 187489656s
2d04h: %SYS-5-CONFIG_I: Configured from console by console
2d04h: OSPF: Start redist-scanning
2d04h: OSPF: Scan for redistribution
2d04h: OSPF: End scanning, Elapsed time 0ms
2d04h: %LINK-5-CHANGED: Interface TokenRing0, changed state to administratively down
2d04h: OSPF: Begin SPF at 0xB2CF100ms, process time 360ms
2d04h: spf_time 0ms, wait_interval 187489656s
2d04h: OSPF: End SPF at 0xB2CF120ms, Total elapsed time 32ms
2d04h: Intra: 24ms, Inter: 0ms, External: 0ms

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Start a TCP data server/receiver for TCP performance testing between two Cisco 7500 router:
sh ver
Cisco Internetwork Operating System Software
IOS (tm) RSP Software (RSP-JSV-M), Version 12.0(7), RELEASE SOFTWARE (fc1)

Router#ttcp
transmit or receive [receive]: transmit
Target IP address: 1.1.1.1
perform tcp half close [n]:
send buflen [8192]:
send nbuf [2048]:
bufalign [16384]:
bufoffset [0]:
port [5001]:
sinkmode [y]:
buffering on writes [y]:
show tcp information at end [n]:

ttcp-t: buflen=8192, nbuf=2048, align=16384/0, port=5001 tcp -> 1.1.1.1
%Connect failed: Destination unreachable; gateway or host down

Router#ttcp
transmit or receive [receive]:
perform tcp half close [n]:
receive buflen [8192]:
bufalign [16384]:
bufoffset [0]:
port [5001]:
sinkmode [y]:
rcvwndsize [4128]:
delayed ACK [y]:
show tcp information at end [n]:

ttcp-r: buflen=8192, align=16384/0, port=5001
rcvwndsize=4128, delayedack=yes tcp

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