Hello Rene,
This is the setup I am using to configure BGP multihoming.
AS 100 has two exit points to reach R5 which is hosting a subnet: 8.8.8.8
My Question is what difference does it make if I advertise directly connected subnets in BGP.
For example:
R1(config-router)#network 192.168.1.0 mask 255.255.255.252
R2(config-router)#network 192.168.2.0 mask 255.255.255.252
One thing which I have noticed is if I do not advertise 192.168.1.0 subnet on R1, R2 did not know about it at all so advertising it on R1 did make sense.
Also, what difference will it make if I advertise the same subnet on R3 as well:
R3(config-router)#network 192.168.1.0 mask 255.255.255.252
Please explain I’ve seen some interesting changes on R5 BGP table by playing with above configurations. Requesting you to please put some light here.
Many Thanks.