缺省路由.docx
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缺省路由
实验拓扑：
怎样产生默认路由？
预配置：
R1:
Router（config）#noipdomain-lookup
Router（config）#lineconsole0
Router（config-line）#noexec-t
Router（config-line）#loggingsy
Router（config-line）#exit
Router（config）#hostR1
R1（config）#ints2/1
R1（config-if）#ipaddress12.0.0.1255.255.255.0
R1（config-if）#noshut
R2:
Router（config）#noipdomain-lookup
Router（config）#lineconsole0
Router（config-line）#noexec-t
Router（config-line）#loggingsy
Router（config-line）#exit
Router（config）#hostnameR2
R2（config）#ints2/1
R2（config-if）#ipaddress12.0.0.2255.255.255.0
R2（config-if）#noshut
R2（config-if）#ints2/2
R2（config-if）#ipaddress23.0.0.2255.255.255.0
R2（config-if）#noshut
R3:
Router（config）#noipdomain-lookup
Router（config）#lineconsole0
Router（config-line）#noexec-t
Router（config-line）#loggingsy
Router（config-line）#exit
Router（config）#hostnameR3
R3（config）#ints2/1
R3（config-if）#ipaddress23.0.0.3255.255.255.0
R3（config-if）#noshut
实验配置：
第一种：
R1#showiproute
*Jan2222:
15:
51.059:
%SYS-5-CONFIG_I:
Configuredfromconsolebycons
Codes:
C-connected,S-static,R-RIP,M-mobile,B-BGP
D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2
E1-OSPFexternaltype1,E2-OSPFexternaltype2
i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2
ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticroute
o-ODR,P-periodicdownloadedstaticroute
Gatewayoflastresortisnotset
23.0.0.0/24issubnetted,1subnets
R23.0.0.0[120/1]via12.0.0.2,00:
00:
24,Serial2/1
12.0.0.0/24issubnetted,1subnets
C12.0.0.0isdirectlyconnected,Serial2/1
R2（config）#doshowiproute
Codes:
C-connected,S-static,R-RIP,M-mobile,B-BGP
D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2
E1-OSPFexternaltype1,E2-OSPFexternaltype2
i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2
ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticroute
o-ODR,P-periodicdownloadedstaticroute
Gatewayoflastresortisnotset
23.0.0.0/24issubnetted,1subnets
C23.0.0.0isdirectlyconnected,Serial2/2
12.0.0.0/24issubnetted,1subnets
C12.0.0.0isdirectlyconnected,Serial2/1
R1（config）#routerrip
R1（config-router）#ver2
R1（config-router）#noau
R1（config-router）#net12.0.0.0
R1（config-router）#exit
R1（config）#exit
R2（config）#routerrip
R2（config-router）#ver2
R2（config-router）#noau
R2（config-router）#net12.0.0.0
R2（config-router）#net23.0.0.0
R2（config-router）#exit
R3（config）#intlo0
R3（config-if）#ipaddress3.3.3.3255.255.255.0
R3（config-if）#intlo1
R3（config-if）#ipaddress172.16.1.1255.255.255.0
R3（config）#routerrip
R3（config-router）#version2
R3（config-router）#noauto-summary
R3（config-router）#net23.0.0.0
R3（config）#iproute0.0.0.00.0.0.0172.16.1.2
R3（config）#routerrip
R3（config-router）#redistributestaticmetric1
R1#showiproute
Codes:
C-connected,S-static,R-RIP,M-mobile,B-BGP
D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2
E1-OSPFexternaltype1,E2-OSPFexternaltype2
i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2
ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticroute
o-ODR,P-periodicdownloadedstaticroute
Gatewayoflastresortis12.0.0.2tonetwork0.0.0.0
23.0.0.0/24issubnetted,1subnets
R23.0.0.0[120/1]via12.0.0.2,00:
00:
07,Serial2/1
12.0.0.0/24issubnetted,1subnets
C12.0.0.0isdirectlyconnected,Serial2/1
R*0.0.0.0/0[120/2]via12.0.0.2,00:
00:
07,Serial2/1
R1#ping3.3.3.3
Typeescapesequencetoabort.
Sending5,100-byteICMPEchosto3.3.3.3,timeoutis2seconds:
!
!
!
!
!
Successrateis100percent（5/5）,round-tripmin/avg/max=24/50/92ms
R2（config）#doshowiproute
Codes:
C-connected,S-static,R-RIP,M-mobile,B-BGP
D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2
E1-OSPFexternaltype1,E2-OSPFexternaltype2
i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2
ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticroute
o-ODR,P-periodicdownloadedstaticroute
Gatewayoflastresortis23.0.0.3tonetwork0.0.0.0
23.0.0.0/24issubnetted,1subnets
C23.0.0.0isdirectlyconnected,Serial2/2
12.0.0.0/24issubnetted,1subnets
C12.0.0.0isdirectlyconnected,Serial2/1
R*0.0.0.0/0[120/1]via23.0.0.3,00:
00:
13,Serial2/2
R3#showiproute
Codes:
C-connected,S-static,R-RIP,M-mobile,B-BGP
D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2
E1-OSPFexternaltype1,E2-OSPFexternaltype2
i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2
ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticroute
o-ODR,P-periodicdownloadedstaticroute
Gatewayoflastresortis172.16.1.2tonetwork0.0.0.0
3.0.0.0/24issubnetted,1subnets
C3.3.3.0isdirectlyconnected,Loopback0
23.0.0.0/24issubnetted,1subnets
C23.0.0.0isdirectlyconnected,Serial2/1
172.16.0.0/24issubnetted,1subnets
C172.16.1.0isdirectlyconnected,Loopback1
12.0.0.0/24issubnetted,1subnets
R12.0.0.0[120/1]via23.0.0.2,00:
00:
10,Serial2/1
S*0.0.0.0/0[1/0]via172.16.1.2
第二种
R1与R2不变，
R3（config）#noiproute0.0.0.00.0.0.0172.16.1.2
R3（config）#routerrip
R3（config-router）#noredistributestaticmetric1
R3（config）#routerrip
R3（config-router）#default-informationoriginate
R3（config-router）#exit
R1#showiproute
Codes:
C-connected,S-static,R-RIP,M-mobile,B-BGP
D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2
E1-OSPFexternaltype1,E2-OSPFexternaltype2
i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2
ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticroute
o-ODR,P-periodicdownloadedstaticroute
Gatewayoflastresortisnotset
23.0.0.0/24issubnetted,1subnets
D23.0.0.0[90/2681856]via12.0.0.2,00:
00:
57,Serial2/1
12.0.0.0/24issubnetted,1subnets
C12.0.0.0isdirectlyconnected,Serial2/1
R1#ping23.0.0.3
Typeescapesequencetoabort.
Sending5,100-byteICMPEchosto23.0.0.3,timeoutis2seconds:
!
!
!
!
!
R3（config）#doshowiproute
Codes:
C-connected,S-static,R-RIP,M-mobile,B-BGP
D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2
E1-OSPFexternaltype1,E2-OSPFexternaltype2
i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2
ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticroute
o-ODR,P-periodicdownloadedstaticroute
Gatewayoflastresortisnotset
3.0.0.0/24issubnetted,1subnets
C3.3.3.0isdirectlyconnected,Loopback0
23.0.0.0/24issubnetted,1subnets
C23.0.0.0isdirectlyconnected,Serial2/1
172.16.0.0/24issubnetted,1subnets
C172.16.1.0isdirectlyconnected,Loopback1
12.0.0.0/24issubnetted,1subnets
R12.0.0.0[120/1]via23.0.0.2,00:
00:
23,Serial2/1
第三种：
R1（config）#norouterrip
R1（config）#routereigrp100
R1（config-router）#net12.0.0.10.0.0.255
R2（config）#norouterrip
R2（config）#routereigrp100
R2（config-router）#net12.0.0.20.0.0.255
R2（config-router）#net23.0.0.20.0.0.255
R2（config-router）#noau
R3（config）#norouterrip
R3（config）#routereigrp100
R3（config-router）#net23.0.0.30.0.0.255
R3（config-router）#net172.16.1.10.0.0.255
R3（config）#ipdefault-network172.16.0.0
如果加了下面两个中的任意一个：
R3（config）#routereigrp100
R3（config-router）#noauto-summary
--------------------------------------------------------------------------------------------------
R3（config）#ints2/1
R3（config-if）#ipsummary-addresseigrp100172.16.0.0255.255.0.0
R1#showiproute
Codes:
C-connected,S-static,R-RIP,M-mobile,B-BGP
D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2
E1-OSPFexternaltype1,E2-OSPFexternaltype2
i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2
ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticroute
o-ODR,P-periodicdownloadedstaticroute
Gatewayoflastresortis12.0.0.2tonetwork172.16.0.0
23.0.0.0/24issubnetted,1subnets
D23.0.0.0[90/2681856]via12.0.0.2,00:
03:
49,Serial2/1
D*172.16.0.0/16[90/2809856]via12.0.0.2,00:
00:
18,Serial2/1
12.0.0.0/24issubnetted,1subnets
C12.0.0.0isdirectlyconnected,Serial2/1
R2#showiproute
Codes:
C-connected,S-static,R-RIP,M-mobile,B-BGP
D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2
E1-OSPFexternaltype1,E2-OSPFexternaltype2
i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2
ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticroute
o-ODR,P-periodicdownloadedstaticroute
Gatewayoflastresortisnotset
23.0.0.0/24issubnetted,1subnets
C23.0.0.0isdirectlyconnected,Serial2/2
D*172.16.0.0/16[90/2297856]via23.0.0.3,00:
00:
04,Serial2/2
12.0.0.0/24issubnetted,1subnets
C12.0.0.0isdirectlyconnected,Serial2/1
如果不加：
R1#showiproute
Codes:
C-connected,S-static,R-RIP,M-mobile,B-BGP
D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternal
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