首先看拓?fù)?#xff1a;

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一個(gè)面試考官問我一個(gè)這樣的問題，拓?fù)淙缟?#xff0c;為什么R1上的lo0 PING 不通 R6 上的lo0,說是一切都按正常配置，說是考我EIGRP的特性。我當(dāng)然很納悶，如果都正常配置怎么會(huì)不通呢，最后他告訴我主要是考我，EIGRP的域內(nèi)管理距離是90，域外管理距離是170。當(dāng)時(shí)可能不夠自信也沒多想，回來后越想越不對(duì)，一般來說，只有到達(dá)目的地有兩條路由的時(shí)候才會(huì)考慮管理距離，但這里沒有這個(gè)情況啊，于是自已設(shè)計(jì)了一個(gè)實(shí)驗(yàn)加以驗(yàn)證，結(jié)果是，可以通。

R3 與 R5? R4與R5 使用幀中繼相連，DLCI號(hào)分別為：305 503 405 504

幀中繼只能用點(diǎn)到點(diǎn)子接口。

主要配置如下：

R1：

interface Loopback0
?ip address 1.1.1.1 255.255.255.0

interface Serial1/1
?ip address 10.10.12.1 255.255.255.252

router rip
?version 2
?network 1.0.0.0
?network 10.0.0.0
?no auto-summary

?

R2：

interface FastEthernet0/0
?ip address 10.10.24.1 255.255.255.252
?duplex half
!
interface Serial1/0
?ip address 10.10.12.2 255.255.255.252
?serial restart-delay 0
?clock rate 64000

router eigrp 1
?redistribute rip metric 10000 100 255 1 1500
?network 10.10.23.0 0.0.0.255
?network 10.10.24.0 0.0.0.255
?no auto-summary
!
router rip
?version 2
?redistribute eigrp 1 metric 2
?network 10.0.0.0
?no auto-summary

R3：

interface Serial1/0
?ip address 10.10.23.2 255.255.255.252
?serial restart-delay 0
!

interface Serial1/2
?ip address 10.10.35.1 255.255.255.252
?encapsulation frame-relay
?serial restart-delay 0
?frame-relay map ip 10.10.35.2 305 broadcast?? //靜態(tài)映射，DLCI號(hào)是幀中繼交換分配置的，如果不配置就不通。

?no frame-relay inverse-arp //靜態(tài)映射要關(guān)閉反向ARP

router eigrp 1
?network 10.10.23.0 0.0.0.255
?network 10.10.35.0 0.0.0.255
?no auto-summary
!

R4：

interface FastEthernet0/0
?ip address 10.10.24.2 255.255.255.252
?duplex half

interface Serial1/2
?ip address 10.10.45.1 255.255.255.252
?encapsulation frame-relay
?serial restart-delay 0
?frame-relay map ip 10.10.45.2 405 broadcast
?no frame-relay inverse-arp

router eigrp 1
?network 10.10.24.0 0.0.0.255
?network 10.10.34.0 0.0.0.255
?network 10.10.45.0 0.0.0.255
?no auto-summary

?

R5：

interface Serial1/1
?ip address 10.10.56.1 255.255.255.252
?serial restart-delay 0

interface Serial1/2.1 point-to-point
?ip address 10.10.45.2 255.255.255.252
?frame-relay interface-dlci 504??
!
interface Serial1/2.2 point-to-point
?ip address 10.10.35.2 255.255.255.252
?frame-relay interface-dlci 503??

router eigrp 1
?redistribute ospf 100 metric 10000 100 255 1 1500
?network 10.10.35.0 0.0.0.255
?network 10.10.45.0 0.0.0.255
?no auto-summary
!
router ospf 100
?log-adjacency-changes
?redistribute eigrp 1 subnets?? //默認(rèn)為TYPE 2，cost 為20
network 10.10.56.0 0.0.0.255 area 0

?

R6：

interface Serial1/0
?ip address 10.10.56.2 255.255.255.252
?serial restart-delay 0

router ospf 100
?log-adjacency-changes
?network 6.6.6.0 0.0.0.255 area 0
?network 10.10.56.0 0.0.0.255 area 0

?

結(jié)果測(cè)試：R1 PING R6

R1#ping 6.6.6.6 so 1.1.1.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds:
Packet sent with a source address of 1.1.1.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 64/92/132 ms
R1#

R6 PING R1

R6#ping 1.1.1.1 so 6.6.6.6

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
Packet sent with a source address of 6.6.6.6
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 84/102/120 ms
R6#

轉(zhuǎn)載于:https://blog.51cto.com/xingno/384556

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