OSPF uses SPF algorithm to calculate SPF tree according to topology. Which of the following statements are correct regarding SPF tree node? (Choose two.)

What is the recommended minimum delay for HRP preemption on the Eudemon?

In the VRP, by default, a BGP router does not automatically send a Refresh packet to request its BGP peer to retransmit an Update packet after the inbound routing policy of the BGP peer changes.

Assume that a TCP connection works properly, and the peer AS number configured for a BGP router is different from the AS number of its BGP peer. During the establishment of a BGP session, the BGP router exchanges routing information with its peer, and finds that its peer AS number is different from the AS number of the peer. Therefore, the BGP router sends a Notification message to the peer, indicating that the establishment of a BGP session fails. Which message can be identified by the Error Code field in the Notification message?

Which of the following route selection tools can be used by other routing protocols in addition to BGP? (Choose all that apply.)