To confirm that your router is sending a specific route to a particular BGP neighbor, you must inspect the outbound advertisements toward that neighbor. In Junos, the command that shows routes being advertised to a peer is show route advertising-protocol bgp with the neighbor address specified. Adding 0.0.0.0 to the command filters the output to the default route, making it the most direct way to validate that the default route is actually being exported to peer 10.100.25.6. This is especially important in data center deployments where default route advertisement is often controlled by policy, conditional origination, or specific export terms, and where you want to verify the real operational result rather than just configuration intent.

The receive-protocol variant shows what you are learning from that neighbor, not what you are sending to it. The show route protocol bgp 0.0.0.0 command only confirms that the default route exists in your local routing table as a BGP-learned route, which does not prove it is being exported to the neighbor. The show route protocol static 0.0.0.0 command would confirm the presence of a static default route locally, but again it does not confirm that it is being advertised over BGP. Therefore, the outbound advertisement command is the correct verification method.