The special line access mode of the dual core computer room in the same city

A company has two core computer rooms in a city for disaster recovery and backup. The two rooms are interconnected with bare optical fiber in the same city, and they rent MPLS L3 × × × with operators respectively. In fact, they are connected to different PE (double PE) respectively, but they all belong to AS4809. The branch office also rents MPLS L3 × × × to access AS4809.

There is an EBGP connection between data center 1 and data center 2, and both data centers announce routes to AS4809. The branch structure receives the routing table of data center 1 and 2, and the business process:

Shenzhen visits computer room 1RU 65522 à 4809 à 64560

Shenzhen visits computer room 2RU 65522 à 4809 à 64554

If the link between core data center 1 and the corresponding PE is disconnected, core computer room 2 simultaneously announces to AS4809 the routing table and business process of the AS of server room 2:

Shenzhen visits computer room 1VU 65522 à 4809 à 64554 à 64560