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Forum Replies

  1. Hi Casper,

    These link-local addresses are only valid on the link and unroutable so that’s why it is no problem to have the same address on multiple interfaces.


  2. Is it possible to work with summarized routes in the dynamic routing protocol, as well as in static routing?

  3. Routing protocols, including RIPNG, support summarization yes.

    Here’s how you can do summarization in RIPNG. Right now, R2 only has one entry:

    R2#show ipv6 route rip 
    R   2001::1/128 [120/2]
         via FE80::F816:3EFF:FE30:91B8, FastEthernet0/0

    Summaries are configured on the interface in RIPNG. Let’s try that on R1:

    R1(config)#interface GigabitEthernet 0/1
    R1(config-if)#ipv6 rip RIPNGTEST summary-address 2001::/64

    Here’s the result:

    R2#show ipv6 route rip 
    R   2001::/64 [120/2]
         via FE80::F816:3EFF:FE30:91B8, FastEthernet0/0
    R   2001::1/128 [120/2]
         via FE80::F816:3EFF:FE30:91B8, FastEthernet0/0

    You can see the 2001::/64 summary route on R2.

    With a static route, we don’t advertise anything so there’s no summary route like in routing protocols.


  4. Hi, Rene,

    Just wondering what if I manually set different link-local address on the different interface in a router when setup RIPNG, is there any error message popup?

  5. Hello Hang.

    If you manually set up different link-local addresses on the interfaces of a router, even if you have RIPNG set up, there shouldn’t be any error messages. This is especially the case with RIPNG because you don’t have any network commands to indicate the subnet on which RIP will be participating. You specifiy the interface on which RIP will be function and this allows you to change the IPv6 address (link local or otherwise) without any problems on your configuration).

    I hope this has been helpful!


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