In BGPIMPLS IP VPN, if the OSPF protocol is used to exchange routing information between PE and CE, the domain identifier (Domain ID) is used to distinguish whether the routes imported in the VPI instance are from the same OSPF domain.

Which of the following statements about the MP_REACH_NLRI attribute of BGP4+ is correct? (Multiple choice)

In the DU label distribution mode, if the Liberal retention mode is adopted, the device will retain all the labels distributed by the LDP Peer, regardless of whether the LDP Peer is the optimal next-hop to reach the target network segment.

When there are multiple redundant links in the IS-S network, multiple equal-cost routes may appear.
Regarding equal-cost routes in an IS-IS network, which of the following descriptions is wrong?

OSFFv2 is an IGP running on an IPv4 network: OSPFV3 is an IGP running on an IPv6 network. Compared with OSPFv2, SPFV3 has a similar LSA type, but the function is slightly different. Which of the following is not included in the LSA type of OSPFv3?