You are asked to implement a point-to-multipoint hub-and-spoke topology in a mixed vendor
environment. The hub device is running the Junos OS and the spoke devices are different
vendor devices. Regarding this scenario, which statement is correct?
A.
The NHTB table must be statically defined.
B.
The NHTB table is automatically created during Phase 2.
C.
The NHTB table is automatically created during Phase 1.
D.
The NHTB table must be imported from each spoke.
Answer is “A”
If both sides running junos OS the NHTB route can aotumatically be obtained from the remote peer during phase 2 negotiations using the NOTIFY_NS_NHTB_INFORM message . if not , the next hop can be entered manually .
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https://www.juniper.net/techpubs/en_US/junos11.4/topics/example/vpn-hub-spoke-nhtb-example-configuring.html
Note: If you are establishing a VPN between two Junos OS devices, then it is not necessary to configure an NHTB because the hub device can obtain the NHTB entry automatically during Phase 2 negotiations. However, if you have configured the VPN to establish the tunnel when data traffic flows, then the hub site cannot initiate the VPN. Without an NHTB entry, the route for that remote peer will not be in the active state.
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I am always the last to know.
A is correct, the entries have to be manual if not using Juniper at both ends.
http://www.juniper.net/techpubs/en_US/junos12.3/topics/concept/vpn-hub-spoke-nhtb-example-overview.html
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