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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. 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

  3. Hello Mayowa

    The PREPEND command will add AS 11 to the AS path when R1 advertises the specific route to R2. So if R1 tells R2 that the path to the destination is through AS1 and AS11, then these two ASs will be added to the BGP table of R2 which is what we want to do.

    I hope this has been helpful!

    Laz

  4. @lagapides I understand. I am just a little bit confuse because when you use the neighbor command, it is most time used to configure things on neighbor router. But in this case, it is used to configure AS-PATH on the local Router (R1). What if instead of doing:

    R1(config)#neighbor 2001:db8:0:12::2 route-map PREPEND out

    i do the configurations from R2. I configure the ipv6 prefix-list and route-map on R2 and then use the command;

    R2(config)#neighbor 2001:db8:0:12::1 route-map PREPEND out

    Will this also work?.

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