[c-nsp] BGP Q

[Bruce Pinsky]

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fredrik.jacobsson at 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:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcprt2/1cfbgp.htm#wp1001470

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bep

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