BGP advertise network which is not configure in device.

[Chin]

Currently I am configure a bgp between 2 ASAs. Attached is my diagram.

I have a problem, I did configured my ASA-A interface with 10.64.150.8/25 and ASA-B interface with 10.64.150.1/25 and able to ping each other. 

When I want to advertise network 10.64.151.0/25 (which is not configure in loopback or any interface and no static route for it). What is the BGP statement advertise this 10.64.151.0/25 in my bgp routing table?

Please assist. 

[Richard Burts]

Perhaps there is something in your situation that I am not understanding correctly. If you want BGP to advertise a network there must be an entry for that network in your routing table. What is 10.64.151.0/25 and how will it work if it is not configured on any interface and there is no static route for it?

HTH

Rick

[Chin]

Hi Richard, 

10.64.151.0/25 is a network not exist in routing table and use as NAT purpose. Agreed with you that the BGP route won't show up 10.64.151.0/25 if it not configure on any interface and no static route. 

[Georg Pauwen · Accepted solution]

Hello,

on a side note, and in addition to Richard's remarks, the easiest way to advertise the route is to inject a null route:

route null0 10.64.151.0 255.255.255.128

This will allow you to advertise the network...

[Chin]

Hi Georg,

Thanks. I tested with my GNS3 with your command and it work. I will try this in real scenario. 

[paul driver]

Hello

FYI - Just one caveat to this is that now any traffic destined for that subnet reaches your bgp rtr is will be blackholed

res

Paul