Tags:


Forum Replies

  1. system says:

    Hello,

    please help me with IPv6 default route.

    for example:

    Futura(config)#ipv6 route ::/0 fastEthernet 0/0 FE80::CE0A:22FF:FED5:0

    so ::/0 means, any address, where must match 0 bytes.

    Is my example of default route correct?

    Thank you

  2. andrew says:

    I built this, and it works perfectly. What version of IOS are you using with GNS3 for this?

    I am noticing some difference in output. For example, my router A for show ipv6 route produces this:

    S   ::/0 [2/0]
         via FE80::C, FastEthernet0/0
    C   2001:DB8:3C4D:1::/64 [0/0]
         via FastEthernet0/0, directly connected
    L   2001:DB8:3C4D:1:C801:29FF:FE78:0/128 [0/0]
         via FastEthernet0/0, receive
    L   FF00::/8 [0/0]
         via Null0, receive

    Notice how for the default static route, mine says "via FE80::C, FastEthernet0/0" where yours just lists the interface. By the way, I hard coded FE80::C on both of Router C's links.

    Let's make this simple and focus on only A, C, and D. Here is the show run I have for all of them:

    A

    !
    upgrade fpd auto
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname A
    !
    boot-start-marker
    boot-end-marker
    !
    logging message-counter syslog
    !
    no aaa new-model
    ip source-route
    no ip icmp rate-limit unreachable
    ip cef
    !
    !
    !
    !         
    no ip domain lookup
    no ipv6 cef
    !
    multilink bundle-name authenticated
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    archive
     log config
      hidekeys
    ! 
    !
    !
    !
    !
    ip tcp synwait-time 5
    ip ssh version 1
    !
    !
    !
    !
    interface FastEthernet0/0
     no ip address
     duplex half
     ipv6 address autoconfig
     ipv6 enable
    !
    ip forward-protocol nd
    no ip http server
    no ip http secure-server
    !
    !
    !         
    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

    C

    upgrade fpd auto
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname C
    !
    boot-start-marker
    boot-end-marker
    !
    logging message-counter syslog
    !
    no aaa new-model
    ip source-route
    no ip icmp rate-limit unreachable
    ip cef
    !
    !
    !
    !         
    no ip domain lookup
    ipv6 unicast-routing
    ipv6 cef
    !
    multilink bundle-name authenticated
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    archive
     log config
      hidekeys
    ! 
    !
    !
    !
    !
    ip tcp synwait-time 5
    ip ssh version 1
    !
    !
    !
    !
    interface FastEthernet0/0
     no ip address
     duplex auto
     speed auto
     ipv6 address FE80::C link-local
     ipv6 address 2001:DB8:3C4D:1::1/64
     ipv6 enable
    !
    interface FastEthernet0/1
     no ip address
     duplex auto
     speed auto
     ipv6 address FE80::C link-local
     ipv6 address 2001:DB8:3C4D:2::1/64
     ipv6 enable
    !
    ip forward-protocol nd
    no ip http server
    no ip http secure-server
    !
    !
    !
    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

    D:

    upgrade fpd auto
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname D
    !
    boot-start-marker
    boot-end-marker
    !
    logging message-counter syslog
    !
    no aaa new-model
    ip source-route
    no ip icmp rate-limit unreachable
    ip cef
    !
    !
    !
    !         
    no ip domain lookup
    no ipv6 cef
    !
    multilink bundle-name authenticated
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    archive
     log config
      hidekeys
    ! 
    !
    !
    !
    !
    ip tcp synwait-time 5
    ip ssh version 1
    !
    !
    !
    !
    interface FastEthernet0/0
     no ip address
     duplex half
     ipv6 address autoconfig
     ipv6 enable
    !
    ip forward-protocol nd
    no ip http server
    no ip http secure-server
    !
    !
    !         
    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
  3. Ok first question. In you post you have the following below. YOu will notice its pointing to :2:2 however there is no :2:2 network on any of the routers is this a typo did you mean to say :23:23::??? also its a 64 instead of a 128 which is what the loopback is. However maybe all addresses are held within the 128?? So your just pointing to a non-existent address knowing that since the one is a prefix of 128 that can hold all addresses so its being sent that way. very cryptic though and I wanted to confirm.

    if this is just a typo then you might want to fix that one and the one below it to as both refer to a :2:2 where none exist.

    also my follow up question is this. a floating route just means you have two static routes and if one goes down there is another one so that is called a floating static route?

  4. Hello Brian

    It seems that @ReneMolenaar is using the 2001:2:2::/64 prefix for the L0 interface on R2 in the first diagram, but when he adds R3 to the topology, he changes it to 2001:23:23::/64. I’ll let him know to change it so that it is consistent all the way through the lesson, either 2:2 or 23:23, including the routing tables.

    Yes. A floating static route is essentially a backup route that is statically configured to have a higher administrative distance than the primary route. This primary route can be a static route as well, or a dynamically configured route. It is the backup static route that is referred to as the floating static route. Note that this is a concept that is used in both IPv4 and IPv6 networks.

    I hope this has been helpful!

    Laz

24 more replies! Ask a question or join the discussion by visiting our Community Forum