Question about BGP

[Maxim Sergeev]

Hi everyone!

I have a question about BGP.
I have stub AS and the public subnet.
Now there is a need for additional public subnet.
As I know Cisco routers support only one BGP instance. Can I add new public subnet in the same BGP Instanse?

for example
I have AS 12345 and public subnet 1.1.1.0/24
I want to add another public subnet 2.2.2.0/24 in AS 12345

Is this configuration correct?

...
router bgp 12345
   no synchronization
   bgp log-neighbor-changes
   network 1.1.1.0 mask 255.255.255.0
   network 2.2.2.0 mask 255.255.255.0
   neighbor 3.3.3.1 remote-as 54321
....

[chrihussey · Accepted solution]

Yes this is correct. Just keep in mind the router will also need a supporting route (connected, static or dynamic), before it will actually advertise it.