As shown in the figure, all routers run OSPF.

Which of the following statements is correct?

In addition to the virtual link, what type of IPv6 address is the source IPv6 address of the He11o packet of OSPFv3?

(Connection) The default MPLS label release method and label distribution control method of Huawei routers and label retention methods are respectively

The link state value information between different ISIS processes of multiple routers is considered to be isolated.

As shown in the figure, MPLS/BGP IPVPN is deployed in the network. The MP-BGP neighbor relationship is established between PE1 and PE2 through the LoopbackD interface. After the configuration is completed, it is found that CE1 and CE2 cannot learn routes from each other. Use the command on PE2 to query neighbor information as shown in the figure. What is the most likely cause of the problem?