Thanks Bob and everyone for your help. It has helped a lot.

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On 04/09/2012, at 7:07 AM, "Bob McCouch" 
<[email protected]<mailto:[email protected]>> wrote:

Hi Michael,

 Advertise maps are used for conditional advertisement of a prefix that already 
exists in the BGP table. It can be used to advertise a prefix if another 
condition is met, but the prefix that is to be advertised must already be in 
the BGP table.

An inject-map can be used to effectively "originate" one or more of the 
component prefixes based on the existence of a larger block. In effect, you can 
"de-aggregate" a prefix received from another neighbor, but you don't have to 
have the individual component routes already learned.

I guess the "more granular" claim of the docs would be because it doesn't just 
conditionally advertise a route or not, but it conditionally advertises the 
sub-ordinate routes.

Hope that helps!


On Sun, Sep 2, 2012 at 11:31 PM, Michael Davis - Webquor 
<[email protected]<mailto:[email protected]>> wrote:
Hi there - can someone please explain when you would use the "BGP inject-map" 
over the "BGP advertise-map".  I am struggling to see the functional 
difference.  The documentation says that the inject-map gives you more 
granularity than the advertise-map, by I still can't see much difference.
Thanks
Michael

Sent from my iPhone
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