© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—61
!o"ter #o$er%n &oot Se'"ence
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—62
Configuration Register 
All Cisco ro"ters h(ve ( 16)it so*t$(re register th(t+s $ritten in to N!A-.
-  he 16 )its o* the con*ig"r(tion register (re re(d *rom 1/ to 0, *rom le*t to right.
-  he de*("lt con*ig"r(tion setting on Cisco ro"ters is 02102.
  his me(ns th(t )it 1, (nd 1(re on.
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—6
Configuration register 'a"ues
8 &re(9 dis()led
1/8 Di(gnostic (nd ignore N!A-
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—6/
!e(sons to modi*y Con*ig"r(tion !egister 
!ecovering ( lost 3(ss$ord.
:n()ling or dis()ling &re(9.
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—66
etermining t#e Current Configuration Register a"ue
Cis&o %S Soft*are+ 2,00 Soft*are (C2,00!-%.B/S-!)+ ersion 12$(a)+ R3/S S456/R (f&7)
5e&#ni&a" Support: #ttp:88***&is&o&om8te&#support
Copyrig#t (&) 19,-200 by Cis&o Systems+ %n&
Compi"e; Sat 1$-<an-0 07:19 by a"nguyen
R!: System Bootstrap+ ersion 12$(1r) =#"uong 1r?+ R3/S S456/R (f&1)
Router@ uptime is 1 *eeA+ ;ays+ 21 #ours+ 70 minutes
System returne; to R! by re"oa; at 27:0$:$0 5C 5ue !ar 17 200
System image fi"e is Df"as#:&2,00nm-ipbase-mE12$-abinD
Cis&o 2,11 (re'ision 71) *it# 2190$F8102$0F bytes of memory
.ro&essor boar; % 45@1017/1<
2 Seria"(syn&8asyn&) interfa&es
R/! &onfiguration is $ bits *i;e *it# parity enab"e;
279F bytes of non-'o"ati"e &onfiguration memory
220F bytes of /5/ Compa&t4"as# (Rea;86rite)
Configuration register is 0x2102
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—67
Router .o*er-n Boot Seuen&e
#er*orm 3o$eron sel*test 5#%S<.
=o(d (nd r"n )ootstr(3 code.
;ind the Cisco I%S So*t$(re.
=o(d the Cisco I%S So*t$(re.
;ind the con*ig"r(tion.
=o(d the con*ig"r(tion.
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—6
#o$er %n Sel* est 5#%S<
>hen ( Cisco ro"ter 3o$ers "3, it 3er*orms ( 3o$eron sel* test 5#%S<.
D"ring this sel* test, the ro"ter eec"tes di(gnostics *rom !%- on (ll h(rd$(re mod"les.
hese di(gnostics veri*y the )(sic o3er(tion o* the C#?, memory, (nd net$or9 inter*(ce 3orts.
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—6
&ootstr(3
he )ootstr(3 lo(der in !%- eec"tes.
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—610
4in;ing t#e Cis&o %S %mage
%rder o* se(rch8
2. #(rses con*ig"r(tion *or )oot system comm(nd
. De*("lts to *irst *ile in *l(sh memory
. Attem3ts to )oot *rom net$or9 server 
/. &oot hel3er im(ge
 
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—611
3oa;ing t#e Configuration
=o(d (nd eec"te the con*ig"r(tion *rom N!A-.