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=router bgp ASN
=neighbor x.x.x.x default-information originate
neighbor <Neighbor IP Address> default-originate
neighbor <IP address of neighbor> default-originate
with different way.
1. network0.0.0.0 (require route exist in routing table.
2. redistributed inject default route into BGP only when currently present in routing table.
3. default information originate
4. neighbor (IP) default-originate
default-information originate
neighbor <IP> default-originate
There are two ways
1) network0.0.0.0 mask0.0.0.0
This will advertise a default route to all of its peers and in order to advertise a default route
there should be a default route in the RIB.
2) neighbor <IP> default-originate
We can use this format to advertise routes selectively, and It is not required to have a matching default
route in the BGP table or the RIB
router bgp ASN_NB
default-information originate
