BGP network advertisement assumes classful if mask is not specified.
When peering to an interface other than the physical one (a loopback for example) remember to update the bgp source on the router with the loopback interface. Also don't forget to configure ebgp-multihop. The default value for ebgp-multihop is 255. You can specify a lower number if desired, but it's not required.
ex R1 - BGP neighbor 200.1.1.1 remote-as 10
BGP neighbor 200.1.1.1 ebgp-multihop
R2 - Int lo0
ip-address 200.1.1.1 255.255.255.255
BGP neighbor 192.168.1.1 remote-as 20
BGP neighbor 192.168.1.1 update-source lo0
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