bgp default route using "aggregate-address"

[Kashish_Patel]

I read/heard somewhere that we can generate default route in BGP using "aggregate-address" command... I did not understand this. Could any expert explain this to me how default route is generated?

Thanks.

[Harold Ritter · Accepted solution]

Hi Kashish,

In principle you could use the aggregate-address command to generate a default route but in practice IOS does not allow you to do that and returns the following error message:

r1(config-router)#aggregate-address 0.0.0.0 0.0.0.0 summary-only

% Aggregating to create default makes no sense,

use a network statement instead.

r1(config-router)#

Regards

[Kashish_Patel]

Thanks Harold.

Did this command use to work on old IOS versions and getting deprecated in favor of network command for newer ones? Just curious.

[Harold Ritter · Accepted solution]

Hi Kashish,

This has been the behavior for as long as I can remember.

Regards

[Kashish_Patel]

Thanks, This helps!