The rollback operation of project cutover can be temporarily determined according to the situation during cutover, and no advance plan is required.

(Connection question) Please correspond the alarm level with the importance of the fault and the countermeasures. (Multiple choice)

Regarding the description of the encapsulation format of labels in MPLS, the correct one is

IGP converges faster than BGP, which may cause network traffic loss. By enabling the OSPF and BGP linkage feature of the device, the device remains as a () router within the set linkage time, so that the link metric value in the advertised LSA is the maximum value, thereby telling other OSPF devices not to use this router to forward data, so as to avoid the loss of traffic. (Note: If English letters are involved, all capitals are required)

As shown in the figure, the operator's BGP/MPLS IP VPN backbone network builds SP through DP. If you want to implement user X If the two sites communicate through the BGP/MPLS IPVPN network, PE1 and PE2 must use a 32-bit masked loopback interface address to establish an MP-IBGP peer relationship.