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Cisco網(wǎng)絡(luò)協(xié)議:EIGRP向本區(qū)域下放默認路由的設(shè)置方法

  發(fā)布時間:2014-09-29 14:12:31   作者:佚名   我要評論
這篇文章主要為大家介紹了Cisco網(wǎng)絡(luò)協(xié)議中EIGRP向本區(qū)域下放默認路由的設(shè)置方法與步驟,EIGRP是加強型內(nèi)部網(wǎng)關(guān)路由協(xié)議,需要的朋友可以參考下

  EIGRP的定義

  EIGRP:Enhanced Interior Gateway Routing Protocol 即 增強內(nèi)部網(wǎng)關(guān)路由線路協(xié)議。也翻譯為 加強型內(nèi)部網(wǎng)關(guān)路由協(xié)議。 EIGRP是Cisco公司的私有協(xié)議。Cisco公司是該協(xié)議的發(fā)明者和唯一具備該協(xié)議解釋和修改權(quán)的廠商。 EIGRP結(jié)合了鏈路狀態(tài)和距離矢量型路由選擇協(xié)議的Cisco專用協(xié)議,采用彌散修正算法(DUAL)來實現(xiàn)快速收斂,可以不發(fā)送定期的路由更新信息以減少帶寬的占用,支持Appletalk、IP、Novell和NetWare等多種網(wǎng)絡(luò)層協(xié)議。

  默認路由

  默認路由是一種特殊的靜態(tài)路由,指的是當(dāng)路由表中與包的目的地址之間沒有匹配的表項時路由器能夠做出的選擇·如果沒有默認路由,那么目的地址在路由表中沒有匹配表項的包將被丟棄· 默認路由在某些時候非常有效,當(dāng)存在末梢網(wǎng)絡(luò)時,默認路由會大大簡化路由器的配置,減輕管理員的工作負擔(dān),提高網(wǎng)絡(luò)性能。

 實驗拓撲如下,路由器R1、R2、R3為內(nèi)部路由器,而R4為外部路由,實驗?zāi)康臑锳S內(nèi)部路由器發(fā)放默認路由,那么如何實現(xiàn)呢,請看下面步驟。


  基礎(chǔ)配置如下:

  R1:

  interface Loopback0

  ip address 1.1.1.1 255.255.255.0

  !

  interface FastEthernet0/0

  ip address 12.1.1.1 255.255.255.0

  !

  router eigrp 90

  network 0.0.0.0

  no auto-summary

  !

  ========================================================

  R2:

  interface Loopback0

  ip address 2.2.2.2 255.255.255.0

  !

  interface FastEthernet0/0

  ip address 23.1.1.2 255.255.255.0

  !

  interface FastEthernet0/1

  ip address 12.1.1.2 255.255.255.0

  !

  router eigrp 90

  network 0.0.0.0

  no auto-summary

  ========================================================

  R3:

  interface Loopback0

  ip address 3.3.3.3 255.255.255.0

  !

  interface FastEthernet0/1

  ip address 23.1.1.3 255.255.255.0

  !

  interface Serial1/0

  ip address 34.1.1.3 255.255.255.0

  !

  router eigrp 90

  network 23.1.1.3 0.0.0.0

  no auto-summary

  =========================================================

  R4:

  interface Loopback0

  ip address 4.4.4.4 255.255.255.0

  !

  interface Serial1/1

  ip address 34.1.1.4 255.255.255.0

  !

  ip route 0.0.0.0 0.0.0.0 Serial1/1 34.1.1.3

  方法1:通過在AS邊界路由器R3上重分發(fā)靜態(tài)的方式引入默認路由

  在R3配置如下:

  R3:

  ip route 0.0.0.0 0.0.0.0 Serial1/0 34.1.1.4

  Router eigrp 90

  Redistribute static

  R1:

  R1#show ip rou

  Gateway of last resort is 12.1.1.2 to network 0.0.0.0

  1.0.0.0/24 is subnetted, 1 subnets

  C 1.1.1.0 is directly connected, Loopback0

  2.0.0.0/24 is subnetted, 1 subnets

  D 2.2.2.0 [90/409600] via 12.1.1.2, 00:15:47, FastEthernet0/0

  23.0.0.0/24 is subnetted, 1 subnets

  D 23.1.1.0 [90/307200] via 12.1.1.2, 00:14:57, FastEthernet0/0

  12.0.0.0/24 is subnetted, 1 subnets

  C 12.1.1.0 is directly connected, FastEthernet0/0

  D*EX 0.0.0.0/0 [170/2221056] via 12.1.1.2, 00:03:44, FastEthernet0/0

  方法2:通過手工宣告默認靜態(tài)路由,只是該路由不能指定下一跳

  R3:

  Ip route 0.0.0.0 0.0.0.0 serial 1/0

  Router eigrp 90

  Network 0.0.0.0

  R1:

  R1#show ip rou

  Gateway of last resort is 12.1.1.2 to network 0.0.0.0

  34.0.0.0/24 is subnetted, 1 subnets

  D 34.1.1.0 [90/2221056] via 12.1.1.2, 00:02:57, FastEthernet0/0

  1.0.0.0/24 is subnetted, 1 subnets

  C 1.1.1.0 is directly connected, Loopback0

  2.0.0.0/24 is subnetted, 1 subnets

  D 2.2.2.0 [90/409600] via 12.1.1.2, 00:23:44, FastEthernet0/0

  3.0.0.0/24 is subnetted, 1 subnets

  D 3.3.3.0 [90/435200] via 12.1.1.2, 00:02:57, FastEthernet0/0

  23.0.0.0/24 is subnetted, 1 subnets

  D 23.1.1.0 [90/307200] via 12.1.1.2, 00:22:55, FastEthernet0/0

  12.0.0.0/24 is subnetted, 1 subnets

  C 12.1.1.0 is directly connected, FastEthernet0/0

  D* 0.0.0.0/0 [90/2221056] via 12.1.1.2, 00:00:03, FastEthernet0/0

  方法3:使用ip default-network x.x.x.x,注意在使用該方法時邊界路由器上要滿足三個條件,條件一:路由表中必須要有該主類路由條目(該主類的子網(wǎng)路由不算),條件二:宣告時要同RIP一樣宣告該主類網(wǎng)絡(luò),條件三:ip default-netwok 后的網(wǎng)絡(luò)也必須是主類網(wǎng)絡(luò)

  D* 0.0.0.0/0 [90/2221056] via 12.1.1.2, 00:00:03, FastEthernet0/0

  R3:

  Ip default-network 34.0.0.0

  Ip route 34.0.0.0 255.0.0.0 serial 1/0 34.1.1.4 //R3并沒有該主類網(wǎng)絡(luò)路由

  Router eigrp 90

  Network 34.0.0.0

  R1:

  R1#show ip route

  Gateway of last resort is 12.1.1.2 to network 34.0.0.0

  34.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

  D 34.1.1.0/24 [90/2221056] via 12.1.1.2, 00:02:11, FastEthernet0/0

  D* 34.0.0.0/8 [90/2221056] via 12.1.1.2, 00:00:14, FastEthernet0/0

  1.0.0.0/24 is subnetted, 1 subnets

  C 1.1.1.0 is directly connected, Loopback0

  2.0.0.0/24 is subnetted, 1 subnets

  D 2.2.2.0 [90/409600] via 12.1.1.2, 00:02:11, FastEthernet0/0

  23.0.0.0/24 is subnetted, 1 subnets

  D 23.1.1.0 [90/307200] via 12.1.1.2, 00:02:11, FastEthernet0/0

  12.0.0.0/24 is subnetted, 1 subnets

  C 12.1.1.0 is directly connected, FastEthernet0/0

  其實我們不一定非要指定外網(wǎng)出接口作為默認網(wǎng)絡(luò),可以使用環(huán)回接口作默認網(wǎng)絡(luò)可可控性也很強,只寫出簡單配置:

  C 12.1.1.0 is directly connected, FastEthernet0/0

R3:

  Ip default-network 192.168.10.0

  Interface loopback 1

  Ip address 192.168.10.1 255.255.255.0

  Router eigrp 90

  Network 192.168.10.0

  R1:

  R1#show ip rou

  Gateway of last resort is 12.1.1.2 to network 192.168.10.0

  1.0.0.0/24 is subnetted, 1 subnets

  C 1.1.1.0 is directly connected, Loopback0

  2.0.0.0/24 is subnetted, 1 subnets

  D 2.2.2.0 [90/409600] via 12.1.1.2, 00:08:12, FastEthernet0/0

  D* 192.168.10.0/24 [90/435200] via 12.1.1.2, 00:00:08, FastEthernet0/0

  23.0.0.0/24 is subnetted, 1 subnets

  D 23.1.1.0 [90/307200] via 12.1.1.2, 00:08:12, FastEthernet0/0

  12.0.0.0/24 is subnetted, 1 subnets

  C 12.1.1.0 is directly connected, FastEthernet0/0

  和上面做出比較,環(huán)回接口更加穩(wěn)定,此外可以減小一個路由條目,內(nèi)網(wǎng)不需要公網(wǎng)的參與,編址也有所優(yōu)化,在網(wǎng)絡(luò)中只有使用ip defaul-netwok下放的不是全0的默認路由

  方法4:由于EIGRP支持CIDR,而CIDR的極限就是0.0.0.0/0

  C 12.1.1.0 is directly connected, FastEthernet0/0

  R3:

  Interface fastethernet 0/1

  Ip summary-address eigrp 90 0.0.0.0 0.0.0.0

  R1:

  R1#show ip rou

  Gateway of last resort is 12.1.1.2 to network 0.0.0.0

  1.0.0.0/24 is subnetted, 1 subnets

  C 1.1.1.0 is directly connected, Loopback0

  2.0.0.0/24 is subnetted, 1 subnets

  D 2.2.2.0 [90/409600] via 12.1.1.2, 00:16:44, FastEthernet0/0

  23.0.0.0/24 is subnetted, 1 subnets

  D 23.1.1.0 [90/307200] via 12.1.1.2, 00:16:44, FastEthernet0/0

  12.0.0.0/24 is subnetted, 1 subnets

  C 12.1.1.0 is directly connected, FastEthernet0/0

  D* 0.0.0.0/0 [90/332800] via 12.1.1.2, 00:00:02, FastEthernet0/0

  以上就是Cisco網(wǎng)絡(luò)協(xié)議EIGRP向本區(qū)域下放默認路由的設(shè)置方法,謝謝閱讀,希望能幫到大家,請繼續(xù)關(guān)注腳本之家,我們會努力分享更多優(yōu)秀的文章。

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