there will be no impact but there will be enhancemnt
in other words
lets say the RR connected to the ASBR and the ASBR connected through EBGP to other BGP AS
between the ASBR and the other BGP AS there will be a subnet
if u dont advertise this subnet either through ur IGP or within the IBGP through the network command u will loss connectivity with other AS
if appackt comes from EBGP and one of ur internal routers wants to answer or send back to it and if it dose not have the path or the network(BETWEEN THE ASBR AND OTHER AS ASBR) installed to the next hop of the packt
which is in this case the other AS ASBR( THE OTHER AS ASBR WILL BE THE NEXT HOP IN THE CASE) that why u need the subnet between ur ASBR and OTHER ASs installed on ur routing table.
BUT,when u add the next-hop-self
ur ASBR will change the next hop ip for any packt arrive from out side ur AS through that ASBR and **the ASBR will make him self the next hop for that route**
in this case u DO NOT need to advertise the network between ur ASBR and other ASs ASBR
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