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PCEP
The 7705 SAR supports three modes of operation for PCC-initiated LSPs, which are
configurable on a per-LSP basis:
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• PCC-initiated and PCC-controlled
When the path of the LSP is computed and updated by the router acting as a
PCE Client (PCC), the LSP is referred to as PCC-initiated and PCC-controlled.
A PCC-initiated and PCC-controlled LSP has the following characteristics:
- The LSP can contain strict or loose hops, or a combination of both.
- CSPF is supported for RSVP-TE LSPs. Local path computation takes the
form of hop-to-label translation for LSPs.
- LSPs can be reported to synchronize the LSP database of a stateful PCE
server using the pce-report option. In this case, the PCE acts in passive
stateful mode for this LSP. The LSP path cannot be updated by the PCE.
The control of the LSP is maintained by the PCC.
• PCC-initiated and PCE-computed
When the path of the LSP is computed by the PCE at the request of the PCC, it
is referred to as PCC-initiated and PCE-computed.
A PCC-initiated and PCE-computed LSP has the following characteristics:
- The pce-computation option must be enabled for the LSP so that the PCE
can perform path computation at the request of the PCC only. The PCC
retains control.
- LSPs can be reported to synchronize the LSP database of a stateful PCE
server using the pce-report option. In this case, the PCE acts in passive
stateful mode for this LSP.
• PCC-initiated and PCE-controlled
When the path of the LSP is updated by the PCE following a delegation from the
PCC, it is referred to as PCC-initiated and PCE-controlled.
A PCC-initiated and PCE-controlled LSP has the following characteristics:
- The pce-control option must be enabled for the LSP so that the PCE can
perform path updates following a network event without an explicit request
from the PCC. The PCC delegates full control.
- The pce-report option must be enabled for LSPs that cannot be delegated
to the PCE. The PCE acts in active stateful mode for this LSP.
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MPLS Guide
3HE 18686 AAAB TQZZA
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