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  • ISIS基础实验


    ISIS Area

    不是ABR将路由转发给内部路由器,而是内部路由器数据库中知道ABR,产生默认路由指向ABR

    路由泄漏
    Uses up/down bit in Type,Length, and Value (TVL) field:主要up/down bit(U/D Bit)用于避免环路
    一旦做了重分布的路由条目都会置up/down bit
    如果Up/Down位设置为0,那么说明这条路由就是始发于本地L1区域的
    如果Up/Down位设置为1,那么说明这条路由是由L2泄漏到L1的
    (路由表中泄漏的路由被标识为“ia”路由,即区域间的路由)
    (路由表中泄漏的IPv6地址路由被标识为“IA”路由,即区域间的路由)
    R4#show isis database                                                      
                                                                               
    IS-IS Level-1 Link State Database:                                         
    LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
    R1.00-00              0x00000006   0xC431        962               0/0/0   
    R2.00-00              0x0000000A   0x12CD        1143              0/0/0   
    R2.02-00              0x00000003   0x71DE        805               0/0/0   
    R3.00-00              0x0000000C   0x39A5        1152              1/0/0   
    R3.02-00              0x00000003   0x92B8        1139              0/0/0   
    R4.00-00            * 0x00000003   0x763E        724               1/0/0   
    R4.02-00            * 0x00000002   0x81C9        891               0/0/0   
    IS-IS Level-2 Link State Database:                                         
    LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
    R3.00-00              0x0000000B   0x8C7E        1144              0/0/0   
    R4.00-00            * 0x00000003   0x4FB4        718               0/0/0   
    R5.00-00              0x00000003   0x540E        908               0/0/0   
    R5.01-00              0x00000001   0x6B65        717               0/0/0   
    R6.00-00              0x00000008   0x42F1        1046              0/0/0   
    R6.02-00              0x00000001   0x8349        907               0/0/0   
    R7.00-00              0x00000007   0x5BE1        1049              0/0/0   
    R7.02-00              0x00000001   0x5775        1026              0/0/0   
    R7.03-00              0x00000002   0x992E        1049              0/0/0   

    如果ATT位设置为1,集成IS-IS就会增加一条到达最近的L1/L2路由器的IP缺省路由
    r1(config)#router isis
    r1(config-router)#is-type level-1    (把路由器变成区域内路由器,默认是level-1-2)
    r1(config-router)#int f0/0.12
    r1(config-subif)#isis circuit-type level-1(把链路变成L1,不等同于上述配置)

    r3#show clns protocol                            
                                                     
    IS-IS Router: <Null Tag>                         
      System Id: 1111.1111.1111.00  IS-Type: level-1 
      Manual area address(es):                       
            49.0012                                  
      Routing for area address(es):                  
            49.0012                                  
      No interfaces in domain/area.                  
      Redistribute:                                  
        static (on by default)                       
      Distance for L2 CLNS routes: 110               
      RRR level: none                                
      Generate narrow metrics: level-1-2             
      Accept narrow metrics:   level-1-2             
      Generate wide metrics:   none                  
      Accept wide metrics:     none                  

    r1#show isis database中的ATT(相当于ABR的标识位) 

    r3(config-router)#redistribute isis ip level-2 into level-1 100    (isis是自己重分布自己)
    r3(config)#access-list 100 permit ip any any

    重分布进来的路由会显示为ia:IS-IS

    删除ATT位产生的默认路由
    R1(config-router)#set-attached-bit route-map A

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

    R1==============================

    !
    version 12.3
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname R1
    !
    boot-start-marker
    boot-end-marker
    !
    !
    no aaa new-model
    ip subnet-zero
    !
    !
    no ip domain lookup
    !
    ip cef
    clns routing
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    interface Loopback0
     ip address 1.1.1.1 255.255.255.255
     ip router isis 
    !
    interface FastEthernet0/0
     no ip address
     duplex auto
     speed auto
    !
    interface FastEthernet0/0.14
     encapsulation dot1Q 14
     ip address 14.1.1.1 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/1
     no ip address
     shutdown
     duplex auto
     speed auto
    !
    interface Serial2/0
     ip address 12.1.1.1 255.255.255.0
     encapsulation frame-relay
     serial restart-delay 0
     clns router isis 
     frame-relay map ip 12.1.1.2 102 broadcast
     frame-relay map clns 102 broadcast
     no frame-relay inverse-arp
    !
    interface Serial2/1
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/2
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/3
     no ip address
     shutdown
     serial restart-delay 0
    !
    router isis 
     net 49.1111.0000.0000.0001.00
     is-type level-1
    !
    no ip http server
    ip classless
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    gatekeeper
     shutdown
    !
    !
    line con 0
     exec-timeout 0 0
     logging synchronous
    line aux 0
    line vty 0 4
    !
    !
    end


    R2========================================

    !
    version 12.3
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname R2
    !
    boot-start-marker
    boot-end-marker
    !
    !
    no aaa new-model
    ip subnet-zero
    !
    !
    no ip domain lookup
    !
    ip cef
    clns routing
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    interface FastEthernet0/0
     no ip address
     duplex auto
     speed auto
    !
    interface FastEthernet0/0.23
     encapsulation dot1Q 23
     ip address 23.1.1.2 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/0.25
     encapsulation dot1Q 25
     ip address 25.1.1.2 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/1
     no ip address
     shutdown
     duplex auto
     speed auto
    !
    interface Serial2/0
     ip address 12.1.1.2 255.255.255.0
     ip router isis 
     encapsulation frame-relay
     serial restart-delay 0
     clns router isis 
     frame-relay map clns 201 broadcast
     frame-relay map ip 12.1.1.1 201 broadcast
     no frame-relay inverse-arp
    !
    interface Serial2/1
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/2
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/3
     no ip address
     shutdown
     serial restart-delay 0
    !
    router isis 
     net 49.1111.0000.0000.0002.00
     is-type level-1-2 backdoor
     redistribute isis ip level-2 into level-1 distribute-list 100
    !
    ip http server
    ip classless
    !
    !
    access-list 100 permit ip any any
    !
    !
    !
    !
    !
    !
    !
    !
    !
    gatekeeper
     shutdown
    !
    !
    line con 0
     exec-timeout 0 0
     logging synchronous
    line aux 0
    line vty 0 4
    !
    !
    end

    R3=================================================

    !
    version 12.3
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname R3
    !
    boot-start-marker
    boot-end-marker
    !
    !
    no aaa new-model
    ip subnet-zero
    !
    !
    no ip domain lookup
    !
    ip cef
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    interface FastEthernet0/0
     no ip address
     duplex auto
     speed auto
    !
    interface FastEthernet0/0.23
     encapsulation dot1Q 23
     ip address 23.1.1.3 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/0.34
     encapsulation dot1Q 34
     ip address 34.1.1.3 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/0.37
     encapsulation dot1Q 37
     ip address 37.1.1.3 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/1
     no ip address
     shutdown
     duplex auto
     speed auto
    !
    interface Serial2/0
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/1
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/2
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/3
     no ip address
     shutdown
     serial restart-delay 0
    !
    router isis 
     net 49.1111.0000.0000.0003.00
     is-type level-1-2 backdoor
     redistribute isis ip level-2 into level-1 distribute-list 100
    !
    ip http server
    ip classless
    !
    !
    access-list 100 permit ip any any
    !
    !
    !
    !
    !
    !
    !
    !
    !
    gatekeeper
     shutdown
    !
    !
    line con 0
     exec-timeout 0 0
     logging synchronous
    line aux 0
    line vty 0 4
    !
    !
    end
    R4=============================================

    !
    version 12.3
    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
    ip subnet-zero
    !
    !
    no ip domain lookup
    !
    ip cef
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    interface Loopback0
     ip address 4.4.4.4 255.255.255.255
     ip router isis 
    !
    interface FastEthernet0/0
     no ip address
     duplex auto
     speed auto
    !
    interface FastEthernet0/0.14
     encapsulation dot1Q 14
     ip address 14.1.1.4 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/0.34
     encapsulation dot1Q 34
     ip address 34.1.1.4 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/0.45
     encapsulation dot1Q 45
     ip address 45.1.1.4 255.255.255.0
    !
    interface FastEthernet0/1
     no ip address
     shutdown
     duplex auto
     speed auto
    !
    interface Serial2/0
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/1
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/2
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/3
     no ip address
     shutdown
     serial restart-delay 0
    !
    router isis 
     net 49.1111.0000.0000.0004.00
     is-type level-1
    !
    ip http server
    ip classless
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    gatekeeper
     shutdown
    !
    !
    line con 0
     exec-timeout 0 0
     logging synchronous
    line aux 0
    line vty 0 4
    !
    !
    end
    R5==============================================

    !
    version 12.3
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname R5
    !
    boot-start-marker
    boot-end-marker
    !
    !
    no aaa new-model
    ip subnet-zero
    !
    !
    no ip domain lookup
    !
    ip cef
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    interface Loopback0
     ip address 5.5.5.5 255.255.255.255
     ip router isis 
    !
    interface FastEthernet0/0
     no ip address
     duplex auto
     speed auto
    !
    interface FastEthernet0/0.25
     encapsulation dot1Q 25
     ip address 25.1.1.5 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/0.56
     encapsulation dot1Q 56
     ip address 56.1.1.5 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/1
     no ip address
     shutdown
     duplex auto
     speed auto
    !
    interface Serial2/0
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/1
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/2
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/3
     no ip address
     shutdown
     serial restart-delay 0
    !
    router isis 
     net 49.2222.0000.0000.0005.00
    !
    ip http server
    ip classless
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    gatekeeper
     shutdown
    !
    !
    line con 0
     exec-timeout 0 0
     logging synchronous
    line aux 0
    line vty 0 4
    !
    !
    end

    R6======================================

    !
    version 12.3
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname R6
    !
    boot-start-marker
    boot-end-marker
    !
    !
    no aaa new-model
    ip subnet-zero
    !
    !
    no ip domain lookup
    !
    ip cef
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    interface Loopback0
     ip address 6.6.6.6 255.255.255.255
     ip router isis 
    !
    interface FastEthernet0/0
     no ip address
     duplex auto
     speed auto
    !
    interface FastEthernet0/0.56
     encapsulation dot1Q 56
     ip address 56.1.1.6 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/0.67
     encapsulation dot1Q 67
     ip address 67.1.1.6 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/1
     no ip address
     shutdown
     duplex auto
     speed auto
    !
    interface Serial2/0
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/1
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/2
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/3
     no ip address
     shutdown
     serial restart-delay 0
    !
    router isis 
     net 49.2222.0000.0000.0006.00
    !
    ip http server
    ip classless
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    gatekeeper
     shutdown
    !
    !
    line con 0
     exec-timeout 0 0
     logging synchronous
    line aux 0
    line vty 0 4
    !
    !
    end

    R7=======================================

    !
    version 12.3
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname R7
    !
    boot-start-marker
    boot-end-marker
    !
    !
    no aaa new-model
    ip subnet-zero
    !
    !
    no ip domain lookup
    !
    ip cef
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    interface Loopback0
     ip address 7.7.7.7 255.255.255.255
    !
    interface FastEthernet0/0
     no ip address
     duplex auto
     speed auto
    !
    interface FastEthernet0/0.37
     encapsulation dot1Q 37
     ip address 37.1.1.7 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/0.67
     encapsulation dot1Q 67
     ip address 67.1.1.7 255.255.255.0
     ip router isis 
    !
    interface FastEthernet0/1
     no ip address
     shutdown
     duplex auto
     speed auto
    !
    interface Serial2/0
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/1
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/2
     no ip address
     shutdown
     serial restart-delay 0
    !
    interface Serial2/3
     no ip address
     shutdown
     serial restart-delay 0
    !
    router isis 
     net 49.2222.0000.0000.0007.00
    !
    ip http server
    ip classless
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    gatekeeper
     shutdown
    !
    !
    line con 0
     exec-timeout 0 0
     logging synchronous
    line aux 0
    line vty 0 4
    !
    !
    end
     

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  • 原文地址:https://www.cnblogs.com/cyrusxx/p/12824190.html
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