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MPLS Guide
3.5.1 Make-Before-Break (MBB) Procedures for LSP and
The Make-Before-Break (MBB) procedure allows an LSP to switch from an existing
working path to a new path without interrupting service. The MBB procedure does
this by first signaling the new path when it is operationally up, having the ingress LER
move the traffic to the new path, and then allowing the ingress LER to tear down the
original path.
The MBB procedure is invoked during the following operations:
MBB procedure coverage has been extended to most of the other LSP-level and
path-level parameters as follows:
The MBB procedure is not supported on a manual bypass LSP.
3HE 18686 AAAB TQZZA
Path Parameter Configuration Changes
• timer-based and manual resignal of an LSP path
• Fast Reroute (FRR) global revertive procedures
• Traffic Engineering (TE) graceful shutdown procedures
• update of the secondary path due to an update to the primary path SRLG
• LSP primary or secondary path name change
• LSP or path configuration parameter change
• including or excluding admin groups at the LSP and path levels
• enabling or disabling the LSP-level CSPF option
• enabling or disabling LSP-level use-te-metric parameters when the CSPF
option is enabled
• enabling or disabling the LSP-level hop-limit option in the fast-reroute context
• enabling the LSP-level least-fill option
• enabling or disabling the LSP-level adspec option
• changing between node-protect and no node-protect (link-protect) values in the
LSP-level fast-reroute option
• changing the LSP-level and path-level hop-limit parameter values
• enabling or disabling primary or secondary path record or record-label options
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