IPV Lab 6 vs Lab 7 - contradiction in link-local mapping

I noticed that lab 6 IPV maps both the host and link local ipv addresses, but lab 7 does not.    I thought the rule of tumb was to always map the link local and the host IPv addresses with the broadcast statement?  Both required the broadcast due to the nature in which each address would be used?  Link local strictly for routing protocols.

Any one got an "end all to beat all" answer?

Thanks....

LG

Comments

  • You should map broadcast to link-local addresses (CCIE R/S Exam Certification Guide 3-d edition page 773).

    Im interested if we realy need to map link-local address of R5 on R2 and vice-versa...

    At least it perfectly works without it.

     

    Rack1R5#6sr
    IPv6 Routing Table - 8 entries
    Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
           U - Per-user Static route
           I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
           O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
           ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
    R   ::/0 [120/4]
         via FE80::21E:7AFF:FE4D:9B34, Serial0/1/0
    C   2001:CC1E:1:5::/64 [0/0]
         via ::, FastEthernet0/0
    L   2001:CC1E:1:5::5/128 [0/0]
         via ::, FastEthernet0/0
    R   2001:CC1E:1:23::/64 [120/3]
         via FE80::21E:7AFF:FE4D:9B34, Serial0/1/0
    C   2001:CC1E:1:125::/64 [0/0]
         via ::, Serial0/1/0
    L   2001:CC1E:1:125::5/128 [0/0]
         via ::, Serial0/1/0
    L   FE80::/10 [0/0]
         via ::, Null0
    L   FF00::/8 [0/0]
         via ::, Null0
    Rack1R5#

    interface Serial0/1/0

    ipv6 address 2001:CC1E:1:125::5/64
     ipv6 rip RIP enable
     frame-relay map ipv6 FE80::21E:7AFF:FE4D:9B34 501 broadcast
     frame-relay map ipv6 2001:CC1E:1:125::1 501
     frame-relay map ipv6 2001:CC1E:1:125::2 501

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


    Rack1R1#6i
    FastEthernet0/0            [administratively down/down]
    FastEthernet0/1            [administratively down/down]
    Serial0/1/0                [up/up]
        FE80::21E:7AFF:FE4D:9B34
        2001:CC1E:1:125::1
    Serial0/1/1                [up/up]
    Loopback0                  [up/up]
    Rack1R1#

     

    Rack1R5#pi 2001:CC1E:1:23::2 sour f0/0

    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 2001:CC1E:1:23::2, timeout is 2 seconds:
    Packet sent with a source address of 2001:CC1E:1:5::5
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 112/113/116 ms

    Rack1R5#pi 2001:CC1E:1:23::3 sour f0/0

    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 2001:CC1E:1:23::3, timeout is 2 seconds:
    Packet sent with a source address of 2001:CC1E:1:5::5
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 116/119/120 ms

    Rack1R5(config)#do pi 2001:222:22:2::1 sou f0/0

    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 2001:222:22:2::1, timeout is 2 seconds:
    Packet sent with a source address of 2001:CC1E:1:5::5
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 120/121/128 ms

     

  • The broadcast keyword (if needed and allowed) should be on either the ipv6 global map statement or on the link-local statement, but not on both. The textbook may prefer the link-local map statement, but in practice either will work.

    Dynamic IGP routing requires a frame-relay map statement for the link-local address.

    As with IPv4, the neighbor statement can be used if broadcast/multicast is not allowed.

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