Network command in BGP

[mahanteb]

Hello Experts,

I am a beginner in BGP. I have query regarding network command in BGP.

what's the correct way of applying network command on routers running BGP.

In the attached topology, I have created 2 loopbacks on R5 (150.1.50.1/32 & 150.2.50.1/24) & 2 loopbacks on R7 (200.50.2.1/32 & 200.60.2.1/32)  and then advertised in BGP by using network command in R5 & R7 respectively, so in R1 routing table, I see routes for these Loop backs, In BGP table, these routes were best routes , but the problem was these networks were not reachable from R1.

So I tried 2 methods to fix this connectivity issue.

1) I advertised all networks like 10.1.24.0/24,10.1.36.0/24, 10.1.45.0/24, 10.1.57.0/24, 10.1.67.0/24 in R1 by using network command, so ping started working.

2)  I used network command and redistribute connected on all routers(Except R1) , here also connectivity issue fixed

Kindly confirm which is the correct one. Please find the attached topology for more details.

Thanks,

Mahanteb

[Richard Burts]

Mahanteb

Both approaches work. As to which is better I would suggest that 1 is probably better. My reason for this is that all of the necessary changes are made on a router where you have administrative control. In a lab environment you actually have administrative control of all routers. But in a live environment when you are using EBGP you typically have administrative control of devices within your own AS but do not have administrative control in external AS.

HTH

Rick

[mahanteb]

Thank you Rich..

[Richard Burts]

You are welcome. This community is an excellent place to ask questions and to learn about networking. I hope to see you continue to be active in the community.

HTH

Rick