In addition to the MBB support when the PCC receives a path update, as described in Behavior of the LSP Path Update, an RSVP-TE LSP supports the MBB procedure for any parameter configuration change, including the PCEP-related commands when they result in a change to the path of the LSP.
If the user adds or modifies the path-profile command for an RSVP-TE LSP, a config change MBB is only performed if the pce-computation, pce-report, or pce-control options are enabled on the LSP. Otherwise, no action occurs. When pce-computation, pce-report, or pce-control are enabled on the LSP, the path update MBB (tools>perform>router>mpls>update-path) fails, resulting in no operation.
MBB is also supported for the manual resignal and auto-bandwidth MBB types.
When the LSP goes into an MBB state at the ingress LER, the behavior is dependent on the operating mode of the LSP.
This section contains information on the following LSP MBB procedures: