OSPF虚链路认证.doc

OSPF域间汇总
实验目的：了解并掌握域间汇总的配置
实验拓扑图：

基本配置
R1(config)#int s2/1
R1(config-if)#ip ad 12.0.0.1 255.255.255.0
R1(config-if)#int lo 0
R1(config-if)#ip ad 1.1.0.1 255.255.255.0
R1(config-if)#int lo 1
R1(config-if)#ip ad 1.1.1.1 255.255.255.0
R1(config-if)#int lo 2
R1(config-if)#ip ad 1.1.2.1 255.255.255.0
R1(config-if)#int lo 3
R1(config-if)#ip ad 1.1.3.1 255.255.255.0
R1(config-if)#int s2/1
R1(config-if)#no sh
R1(config-if)#
00:02:54: %LINK-3-UPDOWN: Interface Serial2/1, changed state to up
R1(config-if)#
00:02:55: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/1, changed state to up
R1(config-if)#router ospf 10
R1(config-router)#net 12.0.0.0 0.0.0.255 a 0
R1(config-router)#no net 12.0.0.0 0.0.0.255 a 0
R1(config-router)#net 12.0.0.0 0.0.0.255 a 1
R1(config-router)#net 1.1.0.0 0.0.0.255 a 1
R1(config-router)#net 1.1.1.0 0.0.0.255 a 1
R1(config-router)#net 1.1.2.0 0.0.0.255 a 1
R1(config-router)#net 1.1.3.0 0.0.0.255 a 1

R2(config)#int s2/1
R2(config-if)#ip ad 12.0.0.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#int s2/2
R2(config-if)#
00:02:53: %LINK-3-UPDOWN: Interface Serial2/1, changed state to up
R2(config-if)#ip ad
00:02:54: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/1, changed state to up
R2(config-if)#ip ad 23.0.0.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#int lo 0
00:03:05: %LINK-3-UPDOWN: Interface Serial2/2, changed state to up
R2(config-if)#int lo 0
R2(config-if)#ip ad
00:03:06: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/2, changed state to up
R2(config-if)#ip ad 2.2.2.2 255.255.255.0
R2(config-if)#
00:03:33: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/2, changed state to down
R2(config-if)#
00:03:43: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/2, changed state to up
R2(config-if)#router ospf 10
R2(config-router)#net 12.0.0.0 0.0.0.255 a 1
R2(config-router)#net 2.2.2.2 0.0.0.0 a
00:05:35: %OSPF-5-ADJCHG: Process 10, Nbr 1.1.3.1 on Serial2/1 from LOADING to FULL, Loading Done
R2(config-router)#net 2.2.2.2 0.0.0.0 a 0
R2(config-router)#net 23.0.0.0 0.0.0.255 a 0

R3(config-if)#int s2/1
R3(config-if)#ip ad 23.0.0.3 255.255.255.0
R3(config-if)#no sh
R3(config-if)#
00:03:41: %LINK-3-UPDOWN: Interface Serial2/1, changed state to up
R3(config-if)#
00:03:42: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/1, changed state to up
R3(config-if)#int lo 0
R3(config-if)#ip ad 3.3.3.3 255.255.255.0
R3(config-if)#router ospf 10
R3(config-router)#net 23.0.0.0 0.0.0.255 a 0
R3(config-router)#int s/2
^
% Invalid input detected at '^' marker.

R3(config)#
00:07:07: %OSPF-5-ADJCHG: Process 10, Nbr 2.2.2.2 on Serial2/1 from LOADING to FULL, Loading Done
R3(config)#int s2/2
R3(config-if)#ip ad 34.0.0.03 255.255.255.0
R3(config-if)#no sh
R3(config-if)#router o
00:07:23: %LINK-3-UPDOWN: Interface Serial2/2, changed state to upso
R3(config-if)#router oso
00:07:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial2/2, changed state to up
R3(config-if)#router ospf 10
R3(config-router)#net 34.0.0.0 0.0.0.255 a 2

R4(config)#int s2/1
R4(config-if)#ip ad 34.0.0.4 255.255.255.0
R4(config-if)#no sh
R4(config-if)#int lo 0
R4(config-if)#ip ad 4.4.4.4 255.255.255.0
R4(config-if)#router ospf 10
R4(config-router)#net 34.0.0.0 0.0.0.255 a 2
R4(config-router)#net 4.4.4.4 0.0.0.0 a 2

在R3、R4之间搭建一条虚链路，
R3(config-router)#area 2 vir
R3(config-router)#area 2 virtual-link 4.4.4.4 4.4.4.4为对端router-id，且在配之前双方都能ping通对端的router-id，这样虚链路就可以搭建起来。
R4(config)#router ospf 10
R4(config-router)#area 2 virtual-link 3.3.3.3

R3#show ip ospf virtual-links
Virtual Link OSPF_VL2 to router 4.4.4.4 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 2, via interface Serial2/2, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:08
Adjacency State FULL (Hello suppressed)
Index 2/3, retransmission queue length 1, number of retransmission 1
First 0x62C1C520(22)/0x0(0) Next 0x62C1C520(22)/0x0(0)
Last retransmission scan length is 1, maximum is 1
Last retransmission scan time is 0 msec, maximum is 0 msec
Link State retransmission due in 1516 msec
R4#show ip ospf virtual-links
Virtual Link OSPF_VL3 to router 3.3.3.3 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 2, via interface Serial2/1, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:03
Adjacency State FULL (Hello suppressed)
Index 1/2, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec
R3#show 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
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, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route

Gateway of last resort is not set

34.0.0.0/24 is subnetted, 1 subnets
C 34.0.0.0 is directly connected, Serial2/2
1.0.0.0/22 is subnetted, 1 subnets
O IA 1.1.0.0 [110/129] via 23.0.0.2, 00:00:08, Serial2/1
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/65] via 23.0.0.2, 00:00:08, Serial2/1
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/65] via 34.0.0.4, 00:00:18, Serial2/2
5.0.0.0/32 is subnetted, 1 subnets
O IA 5.5.5.5 [110/129] via 34.0.0.4, 00:00:08, Serial2/2 通过虚链路，可以把几个区域互通起来
23.0.0.0/24 is subnetted, 1 subnets
C 23.0.0.0 is directly connected, Serial2/1
12.0.0.0/24 is subnetted, 1 subnets
O IA 12.0.0.0 [110/128] via 23.0.0.2, 00:00:09, Serial2/1
45.0.0.0/24 is subnetted, 1 subnets
O IA 45.0.0.0 [110/128] via 34.0.0.4, 00:00:09, Serial2/2

我们在R3上给虚链路配置明文认证
R3(config-router)#area 2 virtual-link 4.4.4.4 authentication-key ?
<0-7> Encryption type (0 for not yet encrypted, 7 for proprietary)
LINE Authentication key (8 chars)

R3(config-router)#area 2 virtual-link 4.4.4.4 authentication-key shendu
R3(config-router)#area 2 virtual-link 4.4.4.4 authentication ?
authentication Set authentication type
authentication-key Set authentication key
dead-interval Dead router detection time
hello-interval Hello packet interval
message-digest Message-digest authentication
message-digest-key Set message digest key
null No authentication
retransmit-interval LSA retransmit interval
transmit-delay LSA transmission delay

R3(config-router)#area 2 virtual-link 4.4.4.4 authentication 启用认证，R4不配
R3(config-router)#^Z
R3#ping 4.4.4.4

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 180/339/536 ms
R3#debug ip ospf ajd
^
% Invalid input detected at '^' marker.

R3#debug ip ospf adj
OSPF adjacency events debugging is on
R3#clear ip ospf pro
Reset ALL OSPF processes? [no]: y
R3#
02:00:41: OSPF: Interface OSPF_VL2 going Down
02:00:41: OSPF: 3.3.3.3 address 0.0.0.0 on OSPF_VL2 is dead, state DOWN
02:00:41: OSPF: 4.4.4.4 address 34.0.0.4 on OSPF_VL2 is dead, state DOWN
02:00:41: %OSPF-5-ADJCHG: Process 10, Nbr 4.4.4.4 on OSPF_VL2 from FULL to DOWN, Neighbor Down: Interface down or detached
02:00:41: OSPF: Interface Loopback0 going Down
02:00:41: OSPF: 3.3.3.3 address 3.3.3.3 on Loopback0 is dead, state DOWN
02:00:41: OSPF: Interface Serial2/1 going Down
02:00:41: OSPF: 3.3.3.3 address 23.0.0.3 on Serial2/1 is dead, state DOWN
02:00:41: OSPF: 2.2.2.2 address 23.0.0.2 on Serial2/1 is dead, state DOWN
02:00:41: %OSPF-5-ADJCHG: Process 10, Nbr 2.2.2.2 on Serial2/1 from FULL to DOWN, Neighbor Down: Interface down or detached
02:00:41: OSPF: Interface Serial2/2 going Down
02:00:41: OSPF: 3.3.3.3 address 34.0.0.3 on Serial2/2 is dead, state DOWN
02:00:41: OSPF: 4.4.4.4 address 34.0.0.4 on Serial2/2 is dead, state DOWN
02:00:41: %OSPF-5-ADJCHG: Process 10
R3#, Nbr 4.4.4.4 on Serial2/2 from FULL to DOWN, Neighbor Down: Interface down or detached
02:00:42: OSPF: Interface Loopback0 going Up
02:00:42: OSPF: Interface Serial2/1 going Up
02:00:42: OSPF: Interface Serial2/2 going Up
02:00:42: OSPF: Build router LSA for area 0, router ID 3.3.3.3, seq 0x80000001
02:00:42: OSPF: Build router LSA for area 2, router ID 3.3.3.3, seq 0x80000001
02:00:42: OSPF: Build router LSA for area 1, router ID 3.3.3.3, seq 0x80000001
R3#
02:00:45: OSPF: 2 Way Communication to 4.4.4.4 on Serial2/2, state 2WAY
02:00:45: OSPF: Send DBD to 4.4.4.4 on Serial2/2 seq 0x1174 opt 0x42 flag 0x7 len 32
02:00:46: OSPF: Rcv DBD from 4.4.4.4 on Serial2/2 seq 0x2450 opt 0x42 flag 0x7 len 32 mtu 1500 state EXSTART
02:00:46: OSPF: NBR Negotiation Done. We are the SLAVE
02:00:46: OSPF: Send DBD to 4.4.4.4 on Serial2/2 seq 0x2450 opt 0x42 flag 0x2 len 52
02:00:47: OSPF: Rcv DBD from 4.4.4.4 on Serial2/2 seq 0x2451 opt 0x42 flag 0x3 len 352 mtu 1500 state EXCHANGE
02:00:47: OSPF: Send DBD to 4.4.4.4 on Serial2/2 seq 0x2451 opt 0x42 flag 0x0 len 32
02:00:47: OSPF: Database request to 4.4.4.4
02:00:47: OSPF: sent LS REQ packet to 34.0.0.4, length 192
02:00:47: OSPF: Rcv DBD from 4.4.4.4 on Serial2/2 seq 0x2452 opt 0x42 flag 0x1 len 32 mtu 1500 state EXCHANGE
02:00:47: OSPF: Exchange Done with 4.4.4.4 on Serial2/2
02:00:47: OSPF: Send DBD to 4.4.4.4 on Serial2/2 seq 0x2452 opt 0x42 flag 0x0 len 32
02:00:47: OSPF: Build rou
R3#ter LSA for area 2, router ID 3.3.3.3, seq 0x80000003
02:00:47: OSPF: Synchronized with 4.4.4.4 on Serial2/2, state FULL
02:00:47: %OSPF-5-ADJCHG: Process 10, Nbr 4.4.4.4 on Serial2/2 from LOADING to FULL, Loading Done
R3#
02:00:48: OSPF: 2 Way Communication to 2.2.2.2 on Serial2/1, state 2WAY
02:00:48: OSPF: Send DBD to 2.2.2.2 on Serial2/1 seq 0x14F8 opt 0x42 flag 0x7 len 32
02:00:48: OSPF: Rcv DBD from 2.2.2.2 on Serial2/1 seq 0x2044 opt 0x42 flag 0x7 len 32 mtu 1500 state EXSTART
02:00:48: OSPF: First DBD and we are not SLAVE
02:00:48: OSPF: Rcv DBD from 2.2.2.2 on Serial2/1 seq 0x14F8 opt 0x42 flag 0x2 len 212 mtu 1500 state EXSTART
02:00:48: OSPF: NBR Negotiation Done. We are the MASTER
02:00:48: OSPF: Send DBD to 2.2.2.2 on Serial2/1 seq 0x14F9 opt 0x42 flag 0x3 len 52
02:00:48: OSPF: Database request to 2.2.2.2
02:00:48: OSPF: sent LS REQ packet to 23.0.0.2, length 108
R3#
02:00:49: OSPF: Rcv DBD from 2.2.2.2 on Serial2/1 seq 0x14F9 opt 0x42 flag 0x0 len 32 mtu 1500 state EXCHANGE
02:00:49: OSPF: Send DBD to 2.2.2.2 on Serial2/1 seq 0x14FA opt 0x42 flag 0x1 len 32
02:00:50: OSPF: Rcv DBD from 2.2.2.2 on Serial2/1 seq 0x14FA opt 0x42 flag 0x0 len 32 mtu 1500 state EXCHANGE
02:00:50: OSPF: Exchange Done with 2.2.2.2 on Serial2/1
02:00:50: OSPF: Synchronized with 2.2.2.2 on Serial2/1, state FULL
R3#
02:00:50: %OSPF-5-ADJCHG: Process 10, Nbr 2.2.2.2 on Serial2/1 from LOADING to FULL, Loading Done
R3#
02:00:50: OSPF: Build router LSA for area 0, router ID 3.3.3.3, seq 0x80000002
R3#
02:00:52: OSPF: Build router LSA for area 2, router ID 3.3.3.3, seq 0x80000004
R3#
02:00:56: OSPF: Build router LSA for area 0, router ID 3.3.3.3, seq 0x80000005
R3#
02:01:02: OSPF: Interface OSPF_VL2 going Up
R3#
02:01:04: OSPF: Rcv pkt from 34.0.0.4, OSPF_VL2 : Mismatch Authentication type. Input packet specified type 0, we use type 1 认证匹配不上
R3#
02:01:14: OSPF: Rcv pkt from 34.0.0.4, OSPF_VL2 : Mismatch Authentication type. Input packet specified type 0, we use type 1
R3#
02:01:23: OSPF: Rcv pkt from 34.0.0.4, OSPF_VL2 : Mismatch Authentication type. Input packet specified type 0, we use type 1
R3#
02:01:34: OSPF: Rcv pkt from 34.0.0.4, OSPF_VL2 : Mismatch Authentication type. Input packet specified type 0, we use type 1

R4#ping 3.3.3.3

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 256/445/772 ms 在R4上ping依旧可以ping通