MPLS Guide PCEP
3HE 18686 AAAB TQZZA © 2022 Nokia.
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- The NRC-P computes a new path for the global revertive MBB due to a
failure event. This computation uses the PCUpd message to update the
path using the MBB procedure described in Behavior of the LSP Path
Update. The activation of a bypass LSP by a point of local repair (PLR) in
the network causes the PCC to issue an updated PCRpt message with the
new RRO reflecting the PLR and RRO hops. The PCE will release the
bandwidth on the links that are no longer used by the LSP path.
- The NRC-P computes a new path for the TE graceful shutdown MBB if the
RSVP-TE is using the TE metric, because the TE metric of the link in TE
graceful shutdown is set to infinity. This computation uses the PCUpd
message to update the path using the MBB procedure described in
Behavior of the LSP Path Update.
- The NRC-P does not act on the TE graceful shutdown MBB if the RSVP-TE
is using the IGP metric; however, the user can perform a manual resignal of
the LSP path from the NRC-P to force a new path computation, which
accounts for the newly available bandwidth on the link that caused the MBB
event. This computation uses the PCUpd message to update the path using
the MBB procedure described in Behavior of the LSP Path Update.
- The user can perform a manual resignal of the LSP path from the ingress
LER, which forces an MBB for the path as per the remove-delegation/MBB/
return-delegation procedures described in this section.
- If the user performs no pce-control while the LSP still has the state for any
of the network event triggered MBBs, MBB is performed immediately by the
PCC as described in the procedures in PCE-Computed LSPs for a PCE-
computed LSP and as described in the procedures in PCC-Controlled LSPs
for a PCC-controlled LSP.
7. The timer-based manual resignal MBB functions as the TE graceful shutdown
MBB. The user can perform a manual resignal of the LSP path from the ingress
LER or from the PCE.
8. The path update MBB (tools>perform>router>mpls>update-path) fails, which
results in no operation. This is true in all cases when the RSVP-TE LSP enables
the pce-report option.
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