Faster method for recovery using global protection in MPLS networks
Original Publication Date: 2005-Dec-25
Included in the Prior Art Database: 2005-Dec-25
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Since MPLS (Multi Protocol Label Switching) has become on of the major techniques for provisioning and managing core networks, special emphasis has to be put on the questions of protection and recovery of these types of networks. In general, a network has to deal with the problem of finding a backup path, if the originally supposed network path failed in forwarding the message. Local Protection and Global Protection are the two types in which MPLS based protection can be categorized. In case of local protection, the switch over to the backup path is performed by the Label Switch Router (LSR) that will immediately upstream of the point of failure. The global protection will perform the switch over by the pre-determined LSR which is known as Path Switch LSR (PSL). The PSL is usually distant from the point of failure. So far, in Global Protection protocol implementations over Ethernet networks, no failure propagation method has been used. This leads to the case that connection failure will only be detected after a TE-RSVP (TE, Traffic Engineering; RSVP, Resource Reservation Protocol) path message is sent and no reservation message is received from the end Label Edge Router (LER). Depending on the configuration of the system, the detection could take seconds or possibly minutes before recovery actions can be initiated at the end nodes of the affected LSP (Label Switch Path).