Simplifikasi Allow Prefix

Posted on October 30, 2006. Filed under: BGP |

Tips yang OK.
Daripada susah2 bikin List Prefix satu2…
Langsung bikin : le 24 (less or equal).

ip prefix-list allow-sampai-24 permit 10.0.0.0/16 le 24

+++++++++++++++++++++++++++++++++++++++++++++++++++++
fredrik.jacobsson@seb.se wrote:
> Hi!
>
> Time for a newbie BGP question…
>
> We like to have control over which networks that are announced to us,
> so we’re using prefix-lists associated to the neighbors. This is a
> corporate
> network using BGP with private AS’s. No internet and such.
>
> All fine, but it’s a bit too much administration with the exact matches
> needed by the prefix-lists.
> Is there a way to allow all advertisements within for example
> 10.0.0.0/16 ?
> Meaning that I don’t have to care about what’s specifically announced?
> (aggregate-address on the other end is not an option)
>
> So that they may add for example 10.0.20.0/24 to their list of a
> other /24’s announced to us without any administration at my end…
>
You can use the “ge” and “le” options with the prefix list to specify
multiple addresses within a range of masks. See:
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