为什么 R1 的拓扑表没有显示 192.168.2.0/24 的可行后继？

网络工程 eigrp
2022-02-03 13:25:13

这是一个带有帧中继的 EIGRP 拓扑。我无法弄清楚为什么 R1 的拓扑表没有显示 192.168.2.0/24 的可行继任者？

P 192.168.1.0/24, 1 successors, FD is 2730496
        via 172.16.124.2 (2730496/2218496), Serial3/0
        via 172.16.124.3 (3193856/2681856), Serial3/0
P 192.168.2.0/24, 1 successors, FD is 2681856
        via 172.16.124.3 (2681856/2169856), Serial3/0
P 192.168.3.0/24, 1 successors, FD is 3193856
        via 172.16.124.3 (3193856/2681856), Serial3/0
        via 172.16.124.2 (3242496/2730496), Serial3/0

拓扑如下所示： 在此处输入图像描述

为什么我会在 R5 上收到这些消息？

*Oct 24 05:28:10.455: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.124.1 (Serial3/3) is up: new adjacency
R5(config-if)#
*Oct 24 05:28:23.559: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.124.1 (Serial3/3) is down: Interface G                                                          oodbye received
R5(config-if)#
*Oct 24 05:29:05.299: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.124.1 (Serial3/3) is up: new adjacency
R5(config-if)#
*Oct 24 05:32:09.819: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.124.1 (Serial3/3) is down: retry limit                                                           exceeded
*Oct 24 05:32:10.107: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.124.1 (Serial3/3) is down: Peer goodby                                                          e received
R5(config-if)#
*Oct 24 05:33:03.867: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.124.1 (Serial3/3) is up: new adjacency
R5(config-if)#
*Oct 24 05:33:55.747: %SYS-5-CONFIG_I: Configured from console by console
R5#
*Oct 24 05:36:08.363: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.124.1 (Serial3/3) is down: Peer goodbye received
R5#
*Oct 24 05:36:47.611: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.124.1 (Serial3/3) is up: new adjacency
R5#
*Oct 24 05:39:52.047: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.124.1 (Serial3/3) is down: Peer goodbye received
R5#
*Oct 24 05:40:30.191: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 172.16.124.1 (Serial3/3) is up: new adjacency

有关信息：

1) R1's neighbor table:

    R1#show ip eigrp neighbors
    IP-EIGRP neighbors for process 1
    H   Address                 Interface       Hold Uptime   SRTT   RTO  Q  Seq
                                                (sec)         (ms)       Cnt Num
    1   172.16.124.4            Se3/0            178 00:00:10    1  5000  1  74
    2   172.16.124.2            Se3/0            120 00:15:34  987  5000  0  72
    0   172.16.124.3            Se3/0            147 00:15:34  138   828  0  77

2) R1's topology Table:



    R1#show ip eigrp topology
        IP-EIGRP Topology Table for AS(1)/ID(10.1.3.1)

        Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
               r - reply Status, s - sia Status

        P 10.2.0.0/22, 1 successors, FD is 2297856
                via 172.16.124.2 (2297856/128256), Serial3/0
        P 10.3.1.0/24, 1 successors, FD is 3370496
                via 172.16.124.2 (3370496/2858496), Serial3/0
        P 10.1.3.0/24, 1 successors, FD is 128256
                via Connected, Loopback3
        P 10.3.0.0/22, 1 successors, FD is 2297856
                via 172.16.124.3 (2297856/128256), Serial3/0
        P 10.2.1.0/24, 1 successors, FD is 3321856
                via 172.16.124.3 (3321856/2809856), Serial3/0
        P 10.1.2.0/24, 1 successors, FD is 128256
                via Connected, Loopback2
        P 10.3.3.0/24, 1 successors, FD is 3370496
                via 172.16.124.2 (3370496/2858496), Serial3/0
        P 10.2.2.0/24, 1 successors, FD is 3321856
                via 172.16.124.3 (3321856/2809856), Serial3/0
        P 10.1.1.0/24, 1 successors, FD is 128256
                via Connected, Loopback1
        P 10.3.2.0/24, 1 successors, FD is 3370496
                via 172.16.124.2 (3370496/2858496), Serial3/0
        P 10.2.3.0/24, 1 successors, FD is 3321856
                via 172.16.124.3 (3321856/2809856), Serial3/0
        P 192.168.1.0/24, 1 successors, FD is 2730496
                via 172.16.124.2 (2730496/2218496), Serial3/0
                via 172.16.124.3 (3193856/2681856), Serial3/0
        P 192.168.2.0/24, 1 successors, FD is 2681856
                via 172.16.124.3 (2681856/2169856), Serial3/0
        P 192.168.3.0/24, 1 successors, FD is 3193856
                via 172.16.124.3 (3193856/2681856), Serial3/0
                via 172.16.124.2 (3242496/2730496), Serial3/0
        P 172.16.124.0/29, 1 successors, FD is 2169856
                via Connected, Serial3/0
        P 172.16.120.0/21, 1 successors, FD is 3705856
                via 172.16.124.3 (3705856/3193856), Serial3/0
                via 172.16.124.2 (3754496/3242496), Serial3/0

        3) R1's routing table:

        R1#show ip route
        Codes: C - connected, S - static, 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
               i - IS-IS, su - IS-IS summary, 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

             172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
        C       172.16.124.0/29 is directly connected, Serial3/0
        D       172.16.120.0/21 [90/3705856] via 172.16.124.3, 00:09:57, Serial3/0
             10.0.0.0/8 is variably subnetted, 11 subnets, 2 masks
        D       10.3.1.0/24 [90/3370496] via 172.16.124.2, 00:09:57, Serial3/0
        D       10.2.0.0/22 [90/2297856] via 172.16.124.2, 00:09:57, Serial3/0
        C       10.1.3.0/24 is directly connected, Loopback3
        D       10.3.0.0/22 [90/2297856] via 172.16.124.3, 00:09:58, Serial3/0
        D       10.2.1.0/24 [90/3321856] via 172.16.124.3, 00:09:58, Serial3/0
        C       10.1.2.0/24 is directly connected, Loopback2
        D       10.3.3.0/24 [90/3370496] via 172.16.124.2, 00:09:57, Serial3/0
        D       10.2.2.0/24 [90/3321856] via 172.16.124.3, 00:09:58, Serial3/0
        C       10.1.1.0/24 is directly connected, Loopback1
        D       10.3.2.0/24 [90/3370496] via 172.16.124.2, 00:09:59, Serial3/0
        D       10.2.3.0/24 [90/3321856] via 172.16.124.3, 00:09:59, Serial3/0
        D    192.168.1.0/24 [90/2730496] via 172.16.124.2, 00:09:59, Serial3/0
        D    192.168.2.0/24 [90/2681856] via 172.16.124.3, 00:09:59, Serial3/0
        D    192.168.3.0/24 [90/3193856] via 172.16.124.3, 00:09:59, Serial3/0

路由器的运行配置：

1) R1 的运行配置：

R1#show running-config
Building configuration...

Current configuration : 2166 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$tImO$nXOKvyq7gRSwqCiLPJQJO.
!
no aaa new-model
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
!
multilink bundle-name authenticated
!
!
key chain EIGRP_KEYS
 key 1
   key-string cisco1
   accept-lifetime 00:00:00 Jan 1 2015 00:00:00 Feb 1 2015
   send-lifetime 00:00:00 Jan 1 2015 00:00:00 Feb 1 2015
 key 2
   key-string cisco2
   accept-lifetime 00:00:00 Jan 28 2015 infinite
   send-lifetime 00:00:00 Jan 28 2015 infinite
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
 log config
  hidekeys
!
!
!
!
ip tcp synwait-time 5
ip ssh version 1
!
!
!
!
interface Loopback1
 ip address 10.1.1.1 255.255.255.0
!
interface Loopback2
 ip address 10.1.2.1 255.255.255.0
!
interface Loopback3
 ip address 10.1.3.1 255.255.255.0
!
interface FastEthernet0/0
 ip address 172.30.8.1 255.255.255.0
 duplex half
!
interface FastEthernet1/0
 no ip address
 shutdown
 duplex half
!
interface GigabitEthernet2/0
 no ip address
 shutdown
 negotiation auto
!
interface Serial3/0
 ip address 172.16.124.1 255.255.255.248
 encapsulation frame-relay
 no ip split-horizon eigrp 1
 serial restart-delay 0
!
interface Serial3/1
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial3/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial3/3
 no ip address
 shutdown
 serial restart-delay 0
!
router eigrp 1
 network 10.0.0.0
 network 172.16.0.0
 network 172.30.0.0
 no auto-summary
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
 shutdown
!
banner motd ^C
*****************************
This is a CISCO ROUTER
*****************************^C
!
line con 0
 exec-timeout 0 0
 privilege level 15
 password cisco
 logging synchronous
 login
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 password cisco
 login
line vty 5 15
 password cisco
 login
!
!
end

1) R2 的运行配置和路由表：

R2#show running-config
Building configuration...

Current configuration : 2121 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$UbxQ$Vsto.IK7WKlg8MkuYywEs1
!
no aaa new-model
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
!
multilink bundle-name authenticated
!
!
key chain EIGRP_KEYS
 key 1
   key-string cisco1
   accept-lifetime 00:00:00 Jan 1 2015 00:00:00 Feb 1 2015
   send-lifetime 00:00:00 Jan 1 2015 00:00:00 Feb 1 2015
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
 log config
  hidekeys
!
!
!
!
ip tcp synwait-time 5
ip ssh version 1
!
!
!
!
interface Loopback1
 ip address 10.2.1.1 255.255.255.0
!
interface Loopback2
 ip address 10.2.2.1 255.255.255.0
!
interface Loopback3
 ip address 10.2.3.1 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface FastEthernet1/0
 no ip address
 shutdown
 duplex half
!
interface GigabitEthernet2/0
 no ip address
 shutdown
 negotiation auto
!
interface Serial3/0
 ip address 172.16.124.2 255.255.255.248
 encapsulation frame-relay
 ip summary-address eigrp 1 10.2.0.0 255.255.252.0 5
 serial restart-delay 0
 frame-relay map ip 172.16.124.3 201
!
interface Serial3/1
 bandwidth 1500
 ip address 192.168.1.1 255.255.255.0
 serial restart-delay 0
!
interface Serial3/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial3/3
 no ip address
 shutdown
 serial restart-delay 0
!
router eigrp 1
 network 10.0.0.0
 network 172.16.0.0
 network 192.168.1.0
 no auto-summary
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
 shutdown
!
banner motd ^C
*****************************
This is a CISCO ROUTER
*****************************^C
!
line con 0
 exec-timeout 0 0
 privilege level 15
 password cisco
 logging synchronous
 login
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 password cisco
 login
line vty 5 15
 password cisco
 login
!
!
end

- R2's routing table;

R2#show ip route
Codes: C - connected, S - static, 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
       i - IS-IS, su - IS-IS summary, 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

     172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C       172.16.124.0/29 is directly connected, Serial3/0
D       172.16.120.0/21 [90/3242496] via 192.168.1.2, 00:10:48, Serial3/1
     10.0.0.0/8 is variably subnetted, 11 subnets, 2 masks
D       10.3.1.0/24 [90/2858496] via 192.168.1.2, 00:10:46, Serial3/1
D       10.2.0.0/22 is a summary, 00:10:45, Null0
D       10.1.3.0/24 [90/2297856] via 172.16.124.1, 00:10:45, Serial3/0
D       10.3.0.0/22 [90/2809856] via 172.16.124.1, 00:10:48, Serial3/0
C       10.2.1.0/24 is directly connected, Loopback1
D       10.1.2.0/24 [90/2297856] via 172.16.124.1, 00:10:45, Serial3/0
D       10.3.3.0/24 [90/2858496] via 192.168.1.2, 00:10:46, Serial3/1
C       10.2.2.0/24 is directly connected, Loopback2
D       10.1.1.0/24 [90/2297856] via 172.16.124.1, 00:10:45, Serial3/0
D       10.3.2.0/24 [90/2858496] via 192.168.1.2, 00:10:46, Serial3/1
C       10.2.3.0/24 is directly connected, Loopback3
C    192.168.1.0/24 is directly connected, Serial3/1
D    192.168.2.0/24 [90/2730496] via 192.168.1.2, 00:10:49, Serial3/1
D    192.168.3.0/24 [90/2730496] via 192.168.1.2, 00:10:49, Serial3/1

3) R3 的运行配置和路由表：

R3#show run
R3#show running-config
Building configuration...

Current configuration : 2273 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$fhTy$oS62/3CBdLhdKH89ogXQE0
!
no aaa new-model
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
!
multilink bundle-name authenticated
!
!
key chain EIGRP_KEYS
 key 1
   key-string cisco1
   accept-lifetime 00:00:00 Jan 1 2015 00:00:00 Feb 1 2015
   send-lifetime 00:00:00 Jan 1 2015 00:00:00 Feb 1 2015
 key 2
   key-string cisco2
   accept-lifetime 00:00:00 Jan 28 2015 infinite
   send-lifetime 00:00:00 Jan 28 2015 infinite
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
 log config
  hidekeys
!
!
!
!
ip tcp synwait-time 5
ip ssh version 1
!
!
!
!
interface Loopback1
 ip address 10.3.1.1 255.255.255.0
!
interface Loopback2
 ip address 10.3.2.1 255.255.255.0
!
interface Loopback3
 ip address 10.3.3.1 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface FastEthernet1/0
 no ip address
 shutdown
 duplex half
!
interface GigabitEthernet2/0
 no ip address
 shutdown
 negotiation auto
!
interface Serial3/0
 ip address 172.16.124.3 255.255.255.248
 encapsulation frame-relay
 ip summary-address eigrp 1 10.3.0.0 255.255.252.0 5
 serial restart-delay 0
 frame-relay map ip 172.16.124.2 301 broadcast
!
interface Serial3/1
 ip address 192.168.3.1 255.255.255.0
 serial restart-delay 0
!
interface Serial3/2
 ip address 192.168.2.2 255.255.255.0
 serial restart-delay 0
!
interface Serial3/3
 no ip address
 shutdown
 serial restart-delay 0
!
router eigrp 1
 network 10.0.0.0
 network 172.16.0.0
 network 192.168.2.0
 network 192.168.3.0
 no auto-summary
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
 shutdown
!
banner motd ^C
*****************************
This is a CISCO ROUTER
*****************************^C
!
line con 0
 exec-timeout 0 0
 privilege level 15
 password cisco
 logging synchronous
 login
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 password cisco
 login
line vty 5 15
 password cisco
 login
!
!
end

- R3's routing table:

R3#show ip route
Codes: C - connected, S - static, 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
       i - IS-IS, su - IS-IS summary, 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

     172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C       172.16.124.0/29 is directly connected, Serial3/0
D       172.16.120.0/21 [90/3193856] via 192.168.2.1, 00:11:18, Serial3/2
     10.0.0.0/8 is variably subnetted, 11 subnets, 2 masks
C       10.3.1.0/24 is directly connected, Loopback1
D       10.2.0.0/22 [90/2809856] via 172.16.124.1, 00:11:16, Serial3/0
D       10.1.3.0/24 [90/2297856] via 172.16.124.1, 00:11:19, Serial3/0
D       10.3.0.0/22 is a summary, 00:11:18, Null0
D       10.2.1.0/24 [90/2809856] via 192.168.2.1, 00:11:18, Serial3/2
D       10.1.2.0/24 [90/2297856] via 172.16.124.1, 00:11:19, Serial3/0
C       10.3.3.0/24 is directly connected, Loopback3
D       10.2.2.0/24 [90/2809856] via 192.168.2.1, 00:11:18, Serial3/2
D       10.1.1.0/24 [90/2297856] via 172.16.124.1, 00:11:19, Serial3/0
C       10.3.2.0/24 is directly connected, Loopback2
D       10.2.3.0/24 [90/2809856] via 192.168.2.1, 00:11:19, Serial3/2
D    192.168.1.0/24 [90/2681856] via 192.168.2.1, 00:11:17, Serial3/2
C    192.168.2.0/24 is directly connected, Serial3/2
D    192.168.3.0/24 [90/2681856] via 192.168.2.1, 00:11:19, Serial3/2

4) R4 的运行配置和路由表：

R4#show running-config
Building configuration...

Current configuration : 1443 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R4
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
 log config
  hidekeys
!
!
!
!
ip tcp synwait-time 5
ip ssh version 1
!
!
!
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface FastEthernet1/0
 no ip address
 shutdown
 duplex half
!
interface GigabitEthernet2/0
 no ip address
 shutdown
 negotiation auto
!
interface Serial3/0
 ip address 192.168.3.2 255.255.255.0
 serial restart-delay 0
!
interface Serial3/1
 ip address 192.168.1.2 255.255.255.0
 serial restart-delay 0
!
interface Serial3/2
 ip address 192.168.2.1 255.255.255.0
 serial restart-delay 0
!
interface Serial3/3
 no ip address
 shutdown
 serial restart-delay 0
!
router eigrp 1
 network 192.168.1.0
 network 192.168.2.0
 network 192.168.3.0
 no auto-summary
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
 shutdown
!
!
line con 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 login
!
!
end

- R4's routing table:

R4#show ip route
Codes: C - connected, S - static, 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
       i - IS-IS, su - IS-IS summary, 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

     172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
D       172.16.124.0/29 [90/2681856] via 192.168.2.2, 00:12:30, Serial3/2
                        [90/2681856] via 192.168.1.1, 00:12:30, Serial3/1
D       172.16.120.0/21 [90/2681856] via 192.168.3.1, 00:12:28, Serial3/0
     10.0.0.0/8 is variably subnetted, 11 subnets, 2 masks
D       10.3.1.0/24 [90/2297856] via 192.168.2.2, 00:13:27, Serial3/2
D       10.2.0.0/22 [90/3321856] via 192.168.2.2, 00:11:34, Serial3/2
D       10.1.3.0/24 [90/2809856] via 192.168.2.2, 00:11:34, Serial3/2
                    [90/2809856] via 192.168.1.1, 00:11:34, Serial3/1
D       10.3.0.0/22 [90/3321856] via 192.168.1.1, 00:11:36, Serial3/1
D       10.2.1.0/24 [90/2297856] via 192.168.1.1, 00:13:29, Serial3/1
D       10.1.2.0/24 [90/2809856] via 192.168.2.2, 00:11:34, Serial3/2
                    [90/2809856] via 192.168.1.1, 00:11:34, Serial3/1
D       10.3.3.0/24 [90/2297856] via 192.168.2.2, 00:13:28, Serial3/2
D       10.2.2.0/24 [90/2297856] via 192.168.1.1, 00:13:29, Serial3/1
D       10.1.1.0/24 [90/2809856] via 192.168.2.2, 00:11:34, Serial3/2
                    [90/2809856] via 192.168.1.1, 00:11:34, Serial3/1
D       10.3.2.0/24 [90/2297856] via 192.168.2.2, 00:13:28, Serial3/2
D       10.2.3.0/24 [90/2297856] via 192.168.1.1, 00:13:29, Serial3/1
C    192.168.1.0/24 is directly connected, Serial3/1
C    192.168.2.0/24 is directly connected, Serial3/2
C    192.168.3.0/24 is directly connected, Serial3/0

5) R5 的运行配置和路由表：

    R5#show running-config
Building configuration...

Current configuration : 1675 bytes
!
upgrade fpd auto
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R5
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$bO2q$Yzyc3mFfHaiVGiOOlz27l0
!
no aaa new-model
no ip icmp rate-limit unreachable
ip cef
!
!
!
!
no ip domain lookup
!
multilink bundle-name authenticated
!
!
!
!
!
!
!
!
!
!
!
!
!
!
archive
 log config
  hidekeys
!
!
!
!
ip tcp synwait-time 5
ip ssh version 1
!
!
!
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex half
!
interface FastEthernet1/0
 no ip address
 shutdown
 duplex half
!
interface GigabitEthernet2/0
 no ip address
 shutdown
 negotiation auto
!
interface Serial3/0
 bandwidth 1500
 ip address 192.168.3.1 255.255.255.0
 serial restart-delay 0
!
interface Serial3/1
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial3/2
 no ip address
 shutdown
 serial restart-delay 0
!
interface Serial3/3
 ip address 172.16.124.4 255.255.255.248
 encapsulation frame-relay
 serial restart-delay 0
!
router eigrp 1
 network 172.16.0.0
 network 192.168.3.0
 no auto-summary
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
no cdp log mismatch duplex
!
!
!
!
!
!
control-plane
!
!
!
!
!
!
!
gatekeeper
 shutdown
!
banner motd ^C
*****************************
This is a CISCO ROUTER
*****************************^C
!
line con 0
 exec-timeout 0 0
 privilege level 15
 password cisco
 logging synchronous
 login
 stopbits 1
line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 password cisco
 login
line vty 5 15
 password cisco
 login
!
!
end

R1 的拓扑表仍未显示 192.168.2.0/24 的可行继任者

R1#show ip eigrp topology
IP-EIGRP Topology Table for AS(1)/ID(10.1.3.1)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 10.2.0.0/22, 1 successors, FD is 2297856
        via 172.16.124.2 (2297856/128256), Serial3/0
P 10.3.1.0/24, 2 successors, FD is 3370496
        via 172.16.124.2 (3370496/2858496), Serial3/0
        via 172.16.124.4 (3370496/2858496), Serial3/0
P 10.1.3.0/24, 1 successors, FD is 128256
        via Connected, Loopback3
P 10.3.0.0/22, 1 successors, FD is 2297856
        via 172.16.124.3 (2297856/128256), Serial3/0
P 10.2.1.0/24, 1 successors, FD is 3321856
        via 172.16.124.3 (3321856/2809856), Serial3/0
        via 172.16.124.4 (3370496/2858496), Serial3/0
P 10.1.2.0/24, 1 successors, FD is 128256
        via Connected, Loopback2
P 10.2.2.0/24, 1 successors, FD is 3321856
        via 172.16.124.3 (3321856/2809856), Serial3/0
        via 172.16.124.4 (3370496/2858496), Serial3/0
P 10.3.3.0/24, 2 successors, FD is 3370496
        via 172.16.124.2 (3370496/2858496), Serial3/0
        via 172.16.124.4 (3370496/2858496), Serial3/0
P 10.1.1.0/24, 1 successors, FD is 128256
        via Connected, Loopback1
P 10.2.3.0/24, 1 successors, FD is 3321856
        via 172.16.124.3 (3321856/2809856), Serial3/0
        via 172.16.124.4 (3370496/2858496), Serial3/0
P 10.3.2.0/24, 2 successors, FD is 3370496
        via 172.16.124.2 (3370496/2858496), Serial3/0
        via 172.16.124.4 (3370496/2858496), Serial3/0
P 192.168.1.0/24, 1 successors, FD is 2730496
        via 172.16.124.2 (2730496/2218496), Serial3/0
        via 172.16.124.3 (3193856/2681856), Serial3/0
P 192.168.2.0/24, 1 successors, FD is 2681856
        via 172.16.124.3 (2681856/2169856), Serial3/0
P 192.168.3.0/24, 1 successors, FD is 2730496
        via 172.16.124.4 (2730496/2218496), Serial3/0
        via 172.16.124.3 (3193856/2681856), Serial3/0
P 172.16.124.0/29, 1 successors, FD is 2169856
        via Connected, Serial3/0
1个回答

在 R5 上，Ser 3/3 的掩码不正确。你有 255.255.248.0。应该是 255.255.255.248。

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