OSPF路由過(guò)濾專題

1、OSPF路由過(guò)濾專題編寫/修訂記錄編寫人/修訂人編寫/修訂日期修訂原因主要修訂關(guān)鍵字李東磊2007年3月16日按模板進(jìn)行修改，增加總結(jié)修改并總結(jié)李東磊2007年5月17日修改部分語(yǔ)句修改部分語(yǔ)句1 .簡(jiǎn)介路由協(xié)議在與對(duì)端路由器進(jìn)行路由信息交換時(shí)，可能需要只接收或發(fā)布一部分滿足給定條件的路由信息；路由協(xié)議在引入其它路由協(xié)議路由信息時(shí)，可能需要只引入一部分滿足條件的路由信息，并對(duì)所引入的路由信息的某些屬性進(jìn)行設(shè)置和修改以使其滿足本網(wǎng)的要求，這也就是我們常說(shuō)的路由策略。下面將對(duì)OSPF路由過(guò)濾策略配置命令進(jìn)行簡(jiǎn)單介紹，希望可以對(duì)大家的現(xiàn)場(chǎng)工作有所幫助。ZXR10的路由策略為進(jìn)行 OSPF路由過(guò)濾提供

2、了三條命令，具體如下：1. filter 命令filter命令可以控制外部 LSA產(chǎn)生的路由是否導(dǎo)入路由表以及導(dǎo)入的優(yōu)先級(jí)，但是不能控制外 部LSA的學(xué)習(xí)。命令為：filter exact < ip-address> <net-mask> vprefence>沒(méi)有exact關(guān)鍵字時(shí)對(duì)所有 <ip-address> <net-mask>范圍的路由進(jìn)行過(guò)濾，有exact關(guān)鍵字表示路由必須精確匹配<ip-address> <net-mask>。<prefence>描述導(dǎo)入匹配路由的優(yōu)先級(jí)，范圍0255,當(dāng)路由的

3、優(yōu)先級(jí)為 255時(shí)，該路由不生效。如果配置了filter，那么只有匹配了filter條目的路由才允許進(jìn)入轉(zhuǎn)發(fā)表，沒(méi)有匹配filter條目的路由不允許進(jìn)入轉(zhuǎn)發(fā)表。用此命令可過(guò)濾由LSA為5類、7類的路由。2. area filter-list 命令area filter-list命令只能用于 ABR上實(shí)現(xiàn)OSPF區(qū)域之間網(wǎng)絡(luò)路由信息的過(guò)濾，即控制LSA 3能不能從一個(gè)區(qū)域?qū)氲搅硪粋€(gè)區(qū)域，命令格式為：area <area-id> filter-list prefix <prefix-list> out | in 分area filter-list in 和area fil

4、ter-list out命令，in表示某區(qū)域允許或者禁止某些3型LSA導(dǎo)入，out表示某區(qū)域允許或者禁止網(wǎng)段導(dǎo)出到其他的區(qū)域，具體允許還是禁止由prefix模版定，如果配置的prefix為空，即prefix不進(jìn)行配置，路有器上也只會(huì)有該區(qū)域3類的LSA,其他LSA area filter-list 命令對(duì)其無(wú)效，默認(rèn)是全部 deny。該路由器上會(huì)只有從該區(qū)域其他路由器學(xué)習(xí)到 的3型LSA。另外它對(duì) LSA 5無(wú)效，prefix默認(rèn)deny all。注：area filter-list 對(duì) LSA 5 類無(wú)效；prefix <prefix-list> 默認(rèn)是 deny all 的。3

5、. distribute-list 命令distribute-list命令可以在任意的路由器上，對(duì)各類外部導(dǎo)入路由都能進(jìn)行過(guò)濾，路由功能相對(duì)前兩條命令強(qiáng)大，它可以配合 access list/gateway/prefix /route-map模版使用，distribute-list in控制路由 的導(dǎo)入，distribute-list out控制路由的發(fā)布，功能靈活多變，可以滿足大部分的要求。命令為 ：distribute-list <1-199>out | in |<1300-2699>out | in | access-list <name>out |

6、in |gateway <n ame> out | prefix <n ame> gateway <n ame> out |out | in | route-map <n ame> out 它可以過(guò)濾各類 LSA的學(xué)習(xí)從而使路由表中不再有需要過(guò)濾的路由條目，但是對(duì)LSA控制確因各類LSA而不同。即對(duì)所有路由可以過(guò)濾路由表項(xiàng)，但對(duì)LSA的過(guò)濾卻因LSA的類型不同而各不相同。2. 網(wǎng)絡(luò)拓?fù)銵oopback1 1.1.1.1Loopback2 222210.10.10.10/24Vlan100OSPF 1AREA 010.10.10.20/24Loop

7、back1 444.4Loopback2 5.5.5.5Loopback3 6.6.6.6ROUTER BZTEWROUTERA圖1:用filter命令過(guò)濾 OSPF路由ZTE瞅ROUTERALoopbackl 1.1.1.1Loopback2 2222Loopback3 333.3Vlan20020.10.10.10/2420.10.10.20/24OSPF 1VlanlOO10.10.10.10/24OSPF 1AREA 010.10.10.20/24AREA 10030.10.10.20/24Loopback1 4.4.4.4Loopback2 5.5.5.5Loopback3 6.66

8、6ROUTERBVlan300圖2：用area filter-list命令過(guò)濾 OSPF路由ZIEWROUTERALoopback1 1.1.1.1Loopback2 2.2.2.2OSPF 1Vlan100 AREA 0Loopback3 3.3.3.310.10.10.20/2410.10.10.10/2430.10.10.10/24Vlan20020.10.10.10/2420.10.10.20/24OSPF 1AREA 10030.10.10.20/24Vlan300Loopback1 4.4.4.4Loopback2 5.5.5.5Loopback3 6.6.6.6ROUTER B圖

9、3： distribute-list命令的使用ZTE軼ROUTERCOSPF 1AREA 0Vla n4000.10.20.10/24 10.10.20.20/24Loopback1 1.1.1.1Loopback2 2.2.2.2OSPF 1Vla n100 AREA 0Loopback1 4.4.4.4Loopback2 5.5.5.5Loopback3 3.3.3.3 10.10.10.10/2410.10.10.20/24 Loopback3 6.666AREA 100Vla n300ROUTER B30.10.10.20/24Vla n20020.10.10.10/2420.10.1

10、0.20/24OSPF 1圖4 :使用route - map過(guò)濾非LSA 5類路由3. 設(shè)備與版本信息設(shè)備類型測(cè)試版本支持的版本硬件配置ZXR10T160G/T64G/T40GV2.6.02D10.p02V2.6.02D10.p02 以后4. 配置4. 1使用filter命令過(guò)濾 OSPF路由圖1說(shuō)明：兩臺(tái)路由器之間起OSPF路由，LOOPBACK地址通過(guò)重分布直連路由到路由表中。按圖1進(jìn)行組網(wǎng)環(huán)境搭建，并在路由器上進(jìn)行以下配置：ROUTER AA(c on fig)# in terface Ioopback1A(c on fig)# in terface loopback2A(c on fi

11、g)# in terface loopback3A(c on fig)#router ospf 1A(c on fig-router)# redistribute conn ectedROUTER B 同上假定要在A上過(guò)濾的路由，并將優(yōu)先級(jí)改為10，其他路由全部deny,則需配置：A(c on fig-router)#filter 10驗(yàn)證：在配置filter前A(c on fig)#sh ip routeIPv4 Routing Table:DestMaskGwIn terfaceOwnerpri metric1.1.1.1255.255.255.255 1.1.1.1loopback1ad

12、dress 002.2.2.2255.255.255.255 2.2.2.2loopback2address 003.3.3.3255.255.255.255 3.3.3.3loopback3address 004.4.4.4255.255.255.255 10.10.10.20vla n100ospf110205.5.5.5255.255.255.255 10.10.10.20vla n100ospf110206.666255.255.255.255 10.10.10.20vla n100ospf1102010.10.10.0255.255.255.010.10.10.10vlanlOOdi

13、rect 00address 00A#sh ip ospf dataLink IDADV RouterAgeSeq#Checksum Link count4.4.4.44.4.4.410800x800000040x745f11.1.1.11.1.1.110750x800000050xca2a1Net Link States (Area 0.0.0.0)Link IDADV RouterAgeSeq#Checksum10.10.10.101.1.1.110750x800000020x9c7eType-5 AS External Link StatesLink IDADV RouterAgeSeq

14、#Checksum Tag4.4.4.44.4.4.410860x800000010xe3fb32212254721.1.1.11.1.1.111510x800000010xc82f32212254725.5.5.54.4.4.410860x800000010xb52632212254722.2.2.21.1.1.111510x800000010x9a5932212254726.6664.4.4.410860x800000010x875032212254723.3.3.31.1.1.13550x800000010x6c833221225472在配置后,A(c on fig-router)#sh

15、 ip rouIPv4 Routing Table:DestMaskGwIn terfaceOwnerpri metric1.1.1.1255.255.255.255 1.1.1.1loopback1address 002.2.2.2255.255.255.255 2.2.2.2loopback2address 003.3.3.3255.255.255.255 3.3.3.3loopback3address 005.5.5.5255.255.255.255 10.10.10.20vla n100ospf10 2010.10.10.0255.255.255.010.10.10.10vlan 10

16、0direct 0010.10.10.10255.255.255.255 10.10.10.10vla n100address 00A#sh ip os daLink IDADV RouterAgeSeq#Checksum Link count4.4.4.44.4.4.415270x800000040x745f11.1.1.11.1.1.115220x800000050xca2a1Net Link States (Area 0.0.0.0)Link IDADV RouterAgeSeq#Checksum10.10.10.101.1.1.115220x800000020x9c7eType-5 A

17、S External Link StatesLink IDADV RouterAgeSeq#Checksum Tag4.4.4.44.4.4.415330x800000010xe3fb32212254721.1.1.11.1.1.115980x800000010xc82f32212254725.5.5.54.4.4.415330x800000010xb52632212254722.2.2.21.1.1.115980x800000010x9a5932212254726.6.6.64.4.4.415330x800000010x875032212254723.3.3.31.1.1.18020x800

18、000010x6c833221225472可見(jiàn)，盡管 ROUTER A做了路由過(guò)濾，但是在 ROUTER A的LSA中還是可以看到 4.444和666.6相關(guān)的鏈路狀態(tài)數(shù)據(jù)庫(kù)。OSPF Filter方式的路由過(guò)濾不能阻止LSA的學(xué)習(xí)，但是可以控制那些LSA可以參與路由表的運(yùn)算。因配置了filter的路由才允許進(jìn)入，其余全部deny,所以需要保留的路由條目需要再配置filter條目。在這如果需要保留所有路由條目，將優(yōu)先級(jí)改為100則需:A(c on fig-router)#filter 配置后A#sh ip routeIPv4 Rout ing Table:1.1.1.1255.255.255.

19、255 1.1.1.1loopback1address 002.2.2.2255.255.255.255 2.2.2.2loopback2address 003.3.3.3255.255.255.255 3.3.3.3loopback3address 004.4.4.4255.255.255.255 10.10.10.20vla n100ospf100 20DestMaskGwIn terfaceOwner pri metric5.5.5.5255.255.255.255 10.10.10.20vla n100ospf10 206.666255.255.255.255 10.10.10.20v

20、la n100ospf100 2010.10.10.0255.255.255.010.10.10.10vlan 100direct 0010.10.10.10255.255.255.255 10.10.10.10vla n100address 004. 2使用area filter-list命令過(guò)濾OSPF路由圖 2 說(shuō)明：VLAN100 在 areaO 中,VLAN200 和 VLAN300 在 OSPF AREA 100 中，network 20 和30網(wǎng)段在area100中。按圖2進(jìn)行組網(wǎng)環(huán)境搭建，現(xiàn)需要 ROUTER A上在area 0中過(guò)濾掉20網(wǎng)段的LSA，保留30 網(wǎng)段得LSA，

21、即A不接收處理20網(wǎng)段的LSA，也不往外發(fā)送20網(wǎng)段的LSA，則在ROUTER A上 進(jìn)行相應(yīng)配置：(基本配置不做介紹)ROUTER A 配置：A(c on fig)#router ospf 1A(c on fig-router)#area 0.0.0.0 filter-list prefix test outII不向外發(fā)送LSAA(c on fig-router)#area 0.0.0.0 filter-list prefix test in不接收處理LSAA(c on fig-router)# redistribute conn ectedA(con fig)# ip prefix-lis

22、t test seq 1 de ny 20.20.20.0 24/deny20網(wǎng)段，seq按順序處理A(con fig)#ip prefix-list test seq 2 permit 0.0.0.0 0保留其余網(wǎng)段ROUTER B 配置：B(c on fig)#router ospf 1B(con fig-router)#redistribute conn ected驗(yàn)證：在配置 area filter-list命令前，A(c on fig)#sh ip os daLink IDADV RouterAgeSeq#Checksum Link count4.4444.4.4.412780x80

23、0000090xd1f111.1.1.11.1.1.112760x800000090x2abb1Net Link States (Area 0.0.0.0)Link IDADV RouterAgeSeq#Checksum10.10.10.204.4.4.412780x800000020xad57Link IDADV RouterAgeSeq#Checksum30.30.30.04.4.4.41880x800000020xdc1630.30.30.01.1.1.150x800000010x39c6/需保留此LSA20.20.20.04.4.4.417910x800000010x48c920.20

24、.20.01.1.1.150x800000010xa27b需刪除此LSALink IDADV RouterAgeSeq#Checksum Link count4.4.4.44.4.4.41830x800000080xf9621.1.1.11.1.1.11760x800000080x626f2Net Link States (Area 0.0.0.100)Link IDADV RouterAgeSeq#Checksum20.20.20.204.4.4.417400x800000010x46a130.30.30.101.1.1.11760x800000020xc915Link IDADV Rout

25、erAgeSeq#Checksum10.10.10.04.4.4.417900x800000010xb17e10.10.10.01.1.1.1110x800000010xc30Type-5 AS External Link StatesLink IDADV RouterAgeSeq#Checksum Tag4.4.4.44.4.4.48890x800000030xdffd32212254721.1.1.11.1.1.112840x800000030xc43132212254725.5.5.54.4448890x800000030xb128322122547222221.1.1.112840x8

26、00000030x965b32212254726.6664.4.4.48890x800000030x835232212254723.3.3.31.1.1.112840x800000030x68853221225472在配置area filter-list命令后:A#sh ip ospf databaseLink IDADV RouterAgeSeq#Checksum Link count4.4.4.44.4.4.44300x800000040xdbec11.1.1.11.1.1.14290x800000040x34b61Net Link States (Area 0.0.0.0)Link ID

27、ADV RouterAgeSeq#Checksum10.10.10.204.4.4.44300x800000010xaf56Link IDADV RouterAgeSeq#Checksum30.30.30.04.4.4.44790x800000010xde1530.30.30.01.1.1.11200x800000010x39c6已保留20.20.20.04.4.4.44790x800000010x48c920網(wǎng)段的已刪除Link IDADV RouterAgeSeq#ChecksumLink count4.4.4.44.4.4.44210x800000050xf1ac21.1.1.11.1.

28、1.14200x800000050x45852Net Link States (Area 0.0.0.100)Link IDADV RouterAgeSeq#Checksum20.20.20.204.4.4.44260x800000010x46a130.30.30.204.4.4.44230x800000020xdaedLink IDADV RouterAgeSeq#Checksum10.10.10.04.4.4.44800x800000010xb17e10.10.10.01.1.1.11210x800000010xc30Type-5 AS External Link StatesLink I

29、DADV RouterAgeSeq#Checksum Tag4.4.4.44.4.4.45460x800000010xe3fb32212254721.1.1.11.1.1.15500x800000010xc82f32212254725.5.5.54.4.4.45460x800000010xb52632212254722.2.2.21.1.1.15500x800000010x9a5932212254726.6.6.64.4.4.45460x800000010x875032212254723.3.3.31.1.1.15500x800000010x6c833221225472從上述結(jié)果得知，area

30、 filter-list命令過(guò)濾路由原理與filter命令完全不同，area filter-list命令直接控制LSA的接收與發(fā)送，當(dāng)接收到對(duì)端的LSA條目時(shí)直接過(guò)濾不參加計(jì)算。另外，在使用area filter-list命令時(shí)一定要注意它只能在ABR上使用，控制LSA tape 3能不能從一個(gè)區(qū)域到另一個(gè)區(qū)域，對(duì)LSA tape 5類無(wú)效。最后，配置最后如沒(méi)有加上permit 命令則進(jìn)行deny all處理，在實(shí)際操作時(shí)要謹(jǐn)慎。4. 3 distribute-list 命令的使用圖3說(shuō)明：VLAN100在骨干域中，VLAN200 與VLAN300在area100中，重分布直連路由到 OSPF

31、 中.因area filter-list命令對(duì)5類LSA無(wú)效，而distribute-list可以在任意路由器上使用 ，可對(duì)任意的 OSPF路由進(jìn)行過(guò)濾.故這里我們?cè)囍鲞^(guò)濾 這條路由 保留4.444/32和666.6/32等的路 由.distribute-list命令功能很強(qiáng)大，它將route-map, prefix, acl模版配合使用，用法靈活多變，下面簡(jiǎn)單介紹通過(guò)三種命令過(guò)濾路由的方法1. 使用acl過(guò)濾ROUTER A上配置：(基本配置同二)A(c on fig)#acl basic nu mber 1A(c on fig-basic-acl)#rule 2 permit anyA(

32、c on fig)#router ospf 1A(c on fig-router)#distribute-list 1 in配置前A(c on fig)#show ip routeIPv4 Rout ing Table:1.1.1.1255.255.255.255 1.1.1.1loopback1address 002222255.255.255.255 2.2.2.2loopback2address 003.3.3.3255.255.255.255 3.3.3.3loopback3address 004.4.4.4255.255.255.255 20.20.20.20vla n200ospf

33、110 205.5.5.5255.255.255.255 20.20.20.20vla n200ospf110 206.666255.255.255.255 20.20.20.20vla n200ospf110 20DestMaskGwIn terfaceOwner pri metricA(c on fig)#show ip ospf databaseLink IDADV RouterAgeSeq#Checksum Link count10.10.20.2010.10.20.201680x800000130x72dd14.4.4.44.4.4.41650x800000130xbdfb11.1.

34、1.11.1.1.11700x800000170x3a1f2Link IDADV RouterAgeSeq#Checksum10.10.20.2010.10.20.201630x8000000c0x7f1910.10.10.204.4.4.414250x8000000d0x9762Summary Net Link States (Area 0.0.0.0)Link IDADV RouterAgeSeq#Checksum30.30.30.04.4.4.42230x8000000f0xc22330.30.30.01.1.1.110100x800000010x39c620.20.20.04.4.4.

35、414790x8000000d0x30d520.20.20.01.1.1.110100x800000010xa27bLink IDADV RouterAge Seq#Checksum Link count4.4.4.44.4.4.41610x800000150xd1bc21.1.1.11.1.1.11760x800000150x25952Net Link States (Area 0.0.0.100)Link IDADV RouterAgeSeq#Checksum20.20.20.204.4.4.413760x8000000d0x2ead30.30.30.204.4.4.41610x80000

36、0100xbefbLink IDADV RouterAgeSeq#Checksum10.10.20.04.4.4.42200x8000000b0x39e110.10.20.01.1.1.110110x800000010x9d9410.10.10.04.4.4.415360x8000000d0x998a10.10.10.01.1.1.110110x800000010xc30Type-5 AS External Link StatesLink IDADV RouterAgeSeq#Checksum Tag4.4.4.44.4.4.48100x8000000e0xc90932212254721.1.

37、1.11.1.1.110110x800000010xc82f32212254725.5.5.54.4.4.48100x8000000e0x9b3332212254722.2.2.21.1.1.110110x800000010x9a5932212254726.6.6.64.4.4.48100x8000000e0x6d5d32212254723.3.3.31.1.1.110110x800000010x6c833221225472配置后：A#sh ip routeIPv4 Rout ing Table:DestMaskGwIn terfaceOwnerpri metric1.1.1.1255.255

38、.255.255 1.1.1.1Ioopback1address 002.2.2.2255.255.255.255 2.2.2.2Ioopback2address 003.3.3.3255.255.255.255 3.3.3.3loopback3address 004.4.4.4255.255.255.255 20.20.20.20vla n200ospf110 206.6.6.6255.255.255.255 20.20.20.20vla n200ospf110 20A#show ip ospf databaseLink IDADV RouterAgeSeq#Checksum10.10.20

39、.2010.10.20.202440x800000130x72dd14.4444.4.4.42410x800000130xbdfb11.1.1.11.1.1.12460x800000170x3a1f2Link countLink IDADV RouterAgeSeq#Checksum10.10.20.2010.10.20.202390x8000000c0x7f1910.10.10.204.4.4.415010x8000000d0x9762Summary Net Link States (Area 0.0.0.0)Link IDADV RouterAgeSeq#Checksum30.30.30.

40、04.4.4.42990x8000000f0xc22330.30.30.01.1.1.110860x800000010x39c620.20.20.04.4.4.415550x8000000d0x30d520.20.20.01.1.1.110860x800000010xa27bLink IDADV RouterAgeSeq#Checksum4.4.4.44.4.4.42360x800000150xd1bc21.1.1.11.1.1.12510x800000150x25952Net Link States (Area 0.0.0.100)Link IDADV RouterAgeSeq#Checks

41、um20.20.20.204.4.4.414510x8000000d0x2ead30.30.30.204.4.4.42360x800000100xbefbLink countLink IDADV RouterAgeSeq#Checksum10.10.20.04.4.4.42950x8000000b0x39e110.10.20.01.1.1.110860x800000010x9d9410.10.10.04.4.4.416110x8000000d0x998a10.10.10.01.1.1.110860x800000010xc30Type-5 AS External Link StatesLink

42、IDADV RouterAgeSeq#Checksum Tag4.4.4.44.4.4.48850x8000000e0xc90932212254721.1.1.11.1.1.110860x800000010xc82f32212254725.5.5.54.4.4.48850x8000000e0x9b3332212254722.2.2.21.1.1.110860x800000010x9a5932212254726.6664.4.4.48850x8000000e0x6d5d32212254723.3.3.31.1.1.110860x800000010x6c833221225472可見(jiàn)，使用ACL過(guò)濾

43、OSPF LSA 5類路由不會(huì)影響LSA的導(dǎo)入。1.使用 prefix-list 過(guò)濾ROUTER A上配置為：/配置一個(gè)名為test的前綴列表/序號(hào)小的優(yōu)先執(zhí)行A(c on fig)#router ospf 1A(con fig-router)#distribute-list prefix test in配置后:A(c on fig-router)#show ip routeDestMaskGwIn terfaceOwnerpri1.1.1.1255.255.255.255 1.1.1.1loopback1address 002.2.2.2255.255.255.255 2.2.2.2loo

44、pback2address 003.3.3.3255.255.255.255 3.3.3.3loopback3address 004.4.4.4255.255.255.255 20.20.20.20vlan 200ospf110 206.6.6.6255.255.255.255 20.20.20.20vlan 200ospf110 20IPv4 Rout ing Table:metric配置后show ip ospf database結(jié)果證明數(shù)據(jù)庫(kù)也是不變的 .即過(guò)濾了 LSA 5類的路由，但是數(shù)據(jù) 庫(kù)上還是會(huì)有這條 5類LSA的。2. 使用route map過(guò)濾在原有的基礎(chǔ)上，我們?cè)?ROU

45、TER A設(shè)備上再連接一臺(tái)路由器，具體見(jiàn)圖4:圖4說(shuō)明：在area 0中加入 ROUTER C ，宣告相應(yīng)網(wǎng)段。在ROUTER B上學(xué)習(xí)到網(wǎng)段的路由，我們用route-map命令將其過(guò)濾ROUTER B上配置為：B(con fig) #acl exte nd nu mber 100B(c on fig-ext-acl)# rule 2 permit ip any anyB(c on fig)#route-map test permit 1B(con fig-route-map)#match ip address 100B(c on fig) #router ospf 1B(config-rou

46、ter)#distribute-list route-map test in驗(yàn)證，在配置前：B#show ip routeIPv4 Routing Table:DestMaskGwIn terfaceOwnerpri metric1.1.1.1255.255.255.255 20.20.20.10vla n200ospf110 202.2.2.2255.255.255.255 20.20.20.10vla n200ospf110 203.3.3.3255.255.255.255 20.20.20.10vla n200ospf110 204.4.4.4255.255.255.255 4.4.4.

47、4loopback1address 005.5.5.5255.255.255.255 5.5.5.5loopback2address 006.666255.255.255.255 6.6.6.6loopback3address 0010.10.10.0255.255.255.010.10.10.20vlan 100direct 0010.10.10.20255.255.255.255 10.10.10.20vla n100address 0010.10.20.0255.255.255.010.10.10.10vlan 100ospf110 2 /配置后無(wú)此路由20.20.20.0255.255

48、.255.020.20.20.20vlan 200direct 0020.20.20.20255.255.255.255 20.20.20.20vla n200address 0030.30.30.0255.255.255.030.30.30.20vlan 300direct 0030.30.30.20255.255.255.255 30.30.30.20vla n300address 00B#show ip ospf databaseLink IDADV RouterAgeSeq#Checksum Link count10.10.20.2010.10.20.202580x800000160x

49、6ce014.4444.4.4.42580x800000160xb7fe11.1.1.11.1.1.12600x8000001a0x34222Net Link States (Area 0.0.0.0)Link IDADV RouterAgeSeq#Checksum10.10.20.2010.10.20.202580x8000000f0x791c10.10.10.204.4.4.415180x800000100x9165Link IDADV RouterAgeSeq#Checksum30.30.30.04.4.4.43310x800000120xbc2630.30.30.01.1.1.114620x800000010x39c620.20.20.04.4.4.415870x800000100x2ad820.20.20.01.1.1.114620x800000010xa27bLink IDADV RouterAgeSeq#Checksum Link count4.4.4.44.4.4.42500x800000180xcbbf21.1.1.11.1.1.12670x8