An LSP that is configured on the router is referred to as a PCC-initiated LSP. An LSP that is not configured on the router, but is instead created by the PCE at the request of an application or a service instantiation, is referred to as a PCE-initiated LSP.
The 7705 SAR supports three modes of operation for PCC-initiated LSPs, which are configurable on a per-LSP basis:
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.