We're Sorry, Full Content Access is for Members Only...

If you like to keep on reading, Become a Member Now! Here is Why:

  • Learn any CCNA, CCNP and CCIE R&S Topic. Explained As Simple As Possible.
  • Try for Just $1. The Best Dollar You've Ever Spent on Your Cisco Career!
  • Full Access to our 622 Lessons. More Lessons Added Every Week!
  • Content created by Rene Molenaar (CCIE #41726)

 

447 New Members signed up the last 30 days!

satisfaction-guaranteed

100% Satisfaction Guaranteed!
You may cancel your monthly membership at any time.
No Questions Asked!

Tags:


Forum Replies

  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 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

  4. Cisco documentation from 2016 provides different order for outbound filtering:

    For inbound updates the order of preference is:
    route-map
    filter-list
    prefix-list, distribute-list

    For outbound updates the order of preference is:

    filter-list
    route-map | unsuppress-map
    advertise-map (conditional-advertisement)
    prefix-list|distribute-list
    ORF prefix-list (a prefix-list the neighbor sends us)
    

    https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5816-bgpfaq-5816.html

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