MPLS Guide MPLS and RSVP-TE
3HE 18686 AAAB TQZZA © 2022 Nokia.
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A hop that corresponds to an adjacency SID must be identified with its far-end host
IP address (next hop) on the subnet. If the local-end host IP address is provided, this
hop is ignored because this router can have multiple adjacencies (next hops) on the
same subnet.
A hop that corresponds to a node SID is identified by the prefix address.
Details of processing the user-configured path hops are provided in SR-TE LSP
Instantiation.
3.12.2 SR-TE LSP Instantiation
When an SR-TE LSP is configured on the router, its path can be computed by the
router or by an external TE controller referred to as a PCE. This feature works with
the Nokia stateful PCE that is part of the Network Services Platform (NSP).
The 7705 SAR supports three different modes of operation configurable on a per-
SR-TE LSP basis.
• When the path of the LSP is computed by the router acting as a PCE client
(PCC), the LSP is referred to as PCC-initiated and PCC-controlled.
A PCC-initiated and controlled SR-TE LSP has the following characteristics:
- can contain strict or loose hops, or a combination of both
- does not support CSPF, and local path computation takes the form of
hop-to-label translation
- has the capability to report an SR-TE LSP to synchronize the LSP database
of a stateful PCE server using the pce-report option, but the LSP path
cannot be updated by the PCE. The control of the LSP is maintained by the
PCC.
• 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 SR-TE LSP supports the passive stateful
mode, which enables the pce-computation option for the SR-TE LSP so that
the PCE can perform path computation at the request of the PCC only. The PCC
retains control.
The capability exists to report an SR-TE LSP to synchronize the LSP database
of a stateful PCE server using the pce-report option.
• When the path of the LSP is computed and updated by the PCE following a
delegation from the PCC, it is referred to as PCC-initiated and PCE-controlled.
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