RI P R I P - 2 RIP -1 R I P - 2 DV RIP -1 RIP-2 16... RIP-2 RIP-2 RIP -1 R I P - 2 RIP-2 RIP-2 RIP-2 V L S M disc ontiguous addr ess sp ace C I D R Cla ssless In ter -Dom ain Routing 121
1 2 2 IP RIP-2 I P RIP-2 I P RIP-2 aut he ntica tion data R I P - 2 RI P-1 U DP p or t 520 RIP-1 RIP-2 r ou te tag RIP A S B G P RIP-1 RI P-1 0 RIP -1 RIP -1 RIP -2 RIP -2 RIP-1 RIP Trad ermary R I P - 2 5. 1 R I P - 2 RIP -1 c l a s s f u l V L S M R I P - 2 Trad ermary R I P - 2 V L S M VLSM Trad ermary V L S M 1 72.16.0.0 Ethernet 24 -b it 2 55. 255. 255. 0 2 54 Et hern et 2 54 2 2 52 3 0 -
R I P - 2 1 2 3 b i t s 2 55. 255. 255. 252 1 72.16.0.0 Et hern et 2 4-b it 30 -b it 2 4 -bit 2 55. 255. 255. 0 Eth ern et 25 4 17 2.16.0.0 25 4 1. 172. 16. 1. 0 / 24 2. 172. 16. 2. 0 / 24 3. 172. 16. 3. 0 / 24... 253. 172. 16. 253. 0 / 24 254. 172. 16. 254. 0 / 24 1 72. 16. 250. 0 30 -b it 64 1. 172. 16. 250. 0 / 30 2. 172. 16. 250. 4 / 30 3. 172. 16. 250. 8 / 30 4. 172. 16. 250. 12 / 30... 63. 172. 16. 250. 248 / 30 64. 172. 16. 250. 252 / 30 17 2.16.0.0 2 55.2 55.25 5.0 Eth ern et 25 4 2 55.25 5.25 5.25 2 2 55. 255. 255. 0 2 55. 255. 255. 252 s u b - s u b n e t t i n g TraderMary 64 3 0-b it 24 -b it 1 72. 16. 251. 0 6 4 30 -b it
1 2 4 5-1 TraderMary hostname NewYork interface Ethernet0 ip address 172.16.1.1 255.255.255.0 interface Ethernet1 ip address 192.168.1.1 255.255.255.0 interface Serial0 description New York to Chicago link ip address 172.16.250.1 255.255.255.252 interface Serial1 description New York to Ames link bandwidth 56 ip address 172.16.250.5 255.255.255.252 version 2 network 172.16.0.0
R I P - 2 1 2 5 hostname Chicago interface Ethernet0 ip address 172.16.50.1 255.255.255.0 interface Serial0 description Chicago to New York link ip address 172.16.250.2 255.255.255.252 interface Serial1 description Chicago to Ames link ip address 172.16.250.9 255.255.255.0 version 2 network 172.16.0.0 hostname Ames interface Ethernet0 ip address 172.16.100.1 255.255.255.0 interface Serial0 description Ames to Chicago link ip address 172.16.250.10 255.255.255.0 interface Serial1 description Ames to New York link bandwidth 56 ip address 172.16.250.6 255.255.255.0 version 2 network 172.16.0.0 1 7 2.1 6. 0. 0 NewYork#sh ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
1 2 6 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default Gateway of last resort is not set C C C C R R R 192.168.1.0 is directly connected, Ethernet1 172.16.0.0/16 is variably subnetted, 6 subnets, 2 masks 172.16.1.0/24 is directly connected, Ethernet0 172.16.250.0/30 is directly connected, Serial0 172.16.250.4/30 is directly connected, Serial1 172.16.50.0/24 [120/1] via 172.16.250.2, 0:00:11, Serial0 172.16.100.0/24 [120/1] via 172.16.250.6, 0:00:19, Serial1 172.16.250.8 [120/1] via 172.16.250.2, 0:00:11, Serial0 [120/1] via 172.16.250.6, 0:00:19, Serial1 / 2 4 / 3 0 Cisco IOS 11.1 R I P - 2 5. 2 RIP-2 RIP -2 RIP-1 0 2-2 R I P RIP -2 RIP-2 5-2 RIP -2
R I P - 2 1 2 7 R I P - 1 RIP-2 UDP U D P po rt 5 2 0 RIP U DP IP 255. 255. 255. 255 RIP-2 2 24. 0.0.9 R I P 2 - R O U T E R S. M C A S T. N E T. RIP-2 RIP-2 RIP A F I Ad dress Family Iden tifier IP add ress M e t r i c RI P-1 2-2 RIP -2 RIP -2 V e r s i o n 2 Rou t e tag RIP a t t r i b u t e E G P B G P EGP AS RIP-2 Su bn et mask RIP-2 RIP -2 V L S M IP RIP IP 5-1 TraderMary New York 17 2.16.1.0 A m e s 1 72. 16. 250. 5 Ames 1 72.1 6.1.0 Next h op 0. 0. 0. 0 5-3 RIP update
1 2 8 R 1 R2 R I P - 2 R4 E I G R P R3 R I P - 2 EIGRP r e d i s t r i b u t i o n R4 EIGRP 10.0.0.0 R3 EIGRP R I P - 2 R3 nex t h o p R 1 R2 10.0.0.0 1 92. 168. 10. 4 R 4 nex t h op R1 R2 10.0.0.0 R 3 1 92. 168. 10. 3 R 3 R 4 a u t h e n t i c a t i o n RIP-2 AFI 0x FFFF RFC1 7 2 3 aut hen tication typ e 2 16-byt es Cisco MD5 MD5 Cisco c h e c k s u m 5. 3 RIP-1 RIP-2 Trad ermary RIP New York hostname NewYork network 172.16.0.0 ISO 11.1 R I P - 1 RIP -2 RIP -1 RI P-1 rip version 1 hostname NewYork version 1 network 172.16.0.0 New Yo rk RIP -2 RIP -1 RIP-2
R I P - 2 1 2 9 hostname NewYork version 2 network 172.16.0.0 NewYo rk RIP-1 RIP -2 RIP-1/RIP-2 int erface co nfiguration mod e RIP RIP-1 RIP -2 RIP -1 RIP-1 ip rip send version 1 RIP -2 ip rip send version 2 RIP-1 RIP-2 ip rip send version 1 2 RIP-1 RIP-2 ip rip receive version 1 RIP-2 RIP-1 ip rip receive version 2 ip rip receive version 1 2
1 3 0 Perth hostname Perth version 2 network 172.22.0.0 Se rial2 Pe rth R I P - 2 Serial2 RI P- 1 RIP -1 Se rial2 RIP-1 interface Serial2 ip rip receive version 1 ip rip send version 1 RIP-1 RIP -2 RIP-2 V L S M RIP-1 RIP -1 R I P - 1 5. 4 RIP I G R P R I P - 2 E I G R P O S P F R 1 72.0.0.0 IP RIP -1 R 1 72.0.0.0 / 1 6 B R A B C / 8 / 16 / 24 I P IP Ames New Yo rk 1 72.1 6.1.0 Ames / 24 Ames 1 72. 16. 100. 0 / 24 RIP-2 /8 / 1 6 / 2 4 RIP-1 RIP-1 RIP-2
R I P - 2 1 3 1 RI P-2 c l a s s l e s s IP A B C 3 2-b it IP R 19 2.16 8.0.0 2 5 5. 2 5 5. 0. 0 I P 1 9 2. 1 6 8 IP RIP -2 RIP -2 RIP-2 V L S M V LSM V L S M RIP -1 RIP -1 NewYork Ames 172.1 6.10 0.0 2 5 5. 2 5 5. 2 5 5. 0 N ewyo r k Et h er n e t 0 1 7 2. 1 6. 1. 1 / 2 4 RIP -1 VLSM RIP-2 RIP-2 RIP-2 32 -b it TraderMary RIP -2 E t h e r n e t 24 -b it 30 -b it Trad ermary
1 3 2 zero subn et IP 0 1 72. 16. 0. 0 / 24 1 72.1 6.0.1 ~ 17 2.16.0.25 4 1 92.16 8.10 0.0/ 26 IP bit 2 5 b it 26 0 R 17 2.16.0.0 B 1 72. 16. 0. 0 / 16 17 2.16.0.0/2 4 1 92.168.100.0 C 1 92. 168. 100. 0 / 24 1 92. 168. 100. 0 / 28 Cisco IOS 1 7 2.1 6 8. 0. 0 / 2 5 5. 2 5 5. 2 5 5.0 17 2.168.0.0/ 2 55.25 5.0.0 IOS ip subnet zero C I D R CIDR CIDR a g g r e g a t i n g 1 92.16 8.0.0 ~ 192.168.255.0 C 19 2.16 8.0.0/ 16 CIDR In ternet C I S P C IDR BGP In ternet 5.5 IP D e s t I P A B C 1 72.1 6.1.1 17 2.16.0.0
R I P - 2 1 3 3 D e s t I P DestIP A B C lon gest pr efix m a t c h D e s t I P De stip b i t - b y - b i t DestIP ip classless no ip classless 5. 6 RIP b a c k b o n e Cisco RIP -2 plain tex t M D 5 s n i f f e r Cisco k e y c h a in Ne wyo rk EmpireState Bldg 20 00feet 1 7 8 2 f e e t key chain EmpireStateBldg key 1 key-string 2000feet key 2 key-string 1782feet
1 3 4 Tr ad e rm ar y Ch i ca go Am e s 2 0 0 0 f e et 178 2feet Chicago key chain SearsTower key 1 key-string 2000feet key 2 key-string 1782feet 200 0feet 178 2feet hostname NewYork interface Ethernet0 ip address 172.16.1.1 255.255.255.0 interface Ethernet1 ip address 192.168.1.1 255.255.255.0 interface Serial0 description Link to Chicago ip address 172.16.250.1 255.255.255.0 ip rip authentication key-chain EmpireStateBldg interface Serial1 description Link to Ames ip address 172.16.251.1 255.255.255.0 ip rip authentication key-chain EmpireStateBldg ip rip authentication mode md5 version 2 network 172.16.0.0 Serial1 A m e s MD5 Serial0 C h i c a g o Ames Chicago N e w Y o r k M D 5 A m e s C h i c a g o IOS M D5 i p rip authentication mode md5
R I P - 2 1 3 5 MD5 Cisc o key manag emen t key chain EmpireStateBldg key 1 key-string 2000feet accept-lifetime 13:00:00 Dec 19 1999 13:00:00 Jan 14 2000 send-lifetime 13:00:00 Dec 19 1999 13:00:00 Jan 14 2000 key 2 key-string 1782feet accept-lifetime 12:00:00 Jan 14 2000 infin i t e send-lifetime 12:00:00 Dec 19 2000 infin i t e 2 000 feet 19 99 1 2 1 9 1 00 200 0 1 1 4 1 0 0 1 14 1 2 0 0 0 0 1 3 0 0 0 0 2 000feet 178 2feet Network Time Pro to col N T P Chicago#sh key chain Key-chain SearsTower: key 1 -- text "1782feet" accept lifetime (13:00:00 Dec 19 1999) - (13:00:00 Jan 14 2000) [valid now] send lifetime (13:00:00 Dec 19 1999) - (13:00:00 Jan 14 2000) [valid now] RIP-2 RIP-1 RIP-1 RIP-2 5. 7 RIP-2 RIP -1 rou te b o un daries R I P - 2
1 3 6 no auto-summary 5. 8 R I P - 2 RIP -2 RIP 15 30 RIP RIP-2 R I P - 1 RIP-2 R I P RIP-1 RIP -2 V L S M RIP 4. 5