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  1. Hi Rene,

    I think that it is a errata:
    This prefix-list checks the entire 2001::/16 range and permits subnets with a /64 or larger.

    It should be:

    This prefix-list checks the entire 2001::/16 range and permits subnets with a /64 o smaller

    Thanks you

  2. Hi Diego,

    Thanks for the message, this sentence is correct though. Take a look at the prefix-list:

    ipv6 prefix-list SMALL_NETWORKS permit 2001::/16 le 64

    The "le 64" part means that it will match /64, /63, /62, /61, /60, etc. All of these are "larger" subnets than /64.

    Rene

  3. Hi Rene
    Great lesson!
    you might want to fix the BGP configuration for R2

    R2(config)#router bgp 1
    R2(config-router)#bgp router-id 2.2.2.2
    R2(config-router)#neighbor 2001:db8:0:12::1 remote-as 2
    R2(config-router)#address-family ipv6
    R2(config-router-af)#neighbor 2001:db8:0:12::2 activate

    Thank you

  4. Hello Rene,

    I was doing a LAB and I discovered something interesting and I wanted to ask you why:

    which is the difference to have the next route-map here:

    router bgp 21
     no synchronization
     bgp router-id 15.15.15.15
     bgp log-neighbor-changes
     neighbor 2001:DB8:12::1 remote-as 20
     neighbor 2001:DB8:12::1 route-map BLOCK_MAP in <------------
     no auto-summary
     !
     address-family ipv6
      neighbor 2001:DB8:12::1 activate
      neighbor 2001:DB8:12::1 prefix-list NET64 in
     exit-address-family

    OR HERE

    router bgp 21
     no synchronization
     bgp router-id 15.15.15.15
     bgp log-neighbor-changes
     neighbor 2001:DB8:12::1 remote-as 20
     no auto-summary
     !
     address-family ipv6
      neighbor 2001:DB8:12::1 activate
      neighbor 2001:DB8:12::1 prefix-list NET64 in
      neighbor 2001:DB8:12::1 route-map BLOCK_MAP in <------

    Both, the router accept the commands but only with the second one works perfectly.

  5. Hi Diana,

    I'd have to test this to confirm it but when you configure it under the main BGP process then it only applies to the IPv4 address family, even though you can establish a neighbor adjacency through IPv6.

    The IPv6 address family is where you configure everything...including route-maps.

    If you want to confirm this, you can advertise some IPv4 prefixes...see if the route-map matches your IPv4 routes. I think it will.

    Rene

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