Figure 40: Configuring Pcep For Mpls Rsvp-Te - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide
710
Topology

Figure 40: Configuring PCEP for MPLS RSVP-TE

In this example, PCC is the ingress router that connects to the external active stateful
PCE.
The external LSPs of Router PCC are computed as follows:
Router PCC receives the LSP tunnel configuration that was set up using the CLI.
1.
Assuming that the received configuration is enabled with external path computing,
Router PCC becomes aware that some of the LSP attributes – bandwidth, path, and
priority – are under the control of the stateful PCE and delegates the LSP to the PCE.
In this example, the external LSP is called
PCC to Router R2 . The CLI-configured ERO for
bandwidth for
PCC-to-R2
Router PCC tries to retrieve the PCE-controlled LSP attributes. To do this, Router PCC
2.
sends out a PCRpt message to the stateful PCE stating that the LSP has been
configured. The PCRpt message communicates the status of the LSP and contains
the local configuration parameters of the LSP.
The stateful PCE modifies one or more of the delegated LSP attributes and sends the
3.
new LSP parameters to Router PCC through the PCUpd message.
On receiving the new LSP parameters, Router PCC sets up a new LSP and re-signals
4.
it using the PCE-provided path.
In this example, the PCE-provided ERO for
for is 8m, and both the setup and hold priority values are 3.
PCC-to-R2
Router PCC sends a PCRpt with the new RRO to the stateful PCE.
5.
PCC-to-R2
PCC-to-R2
is 10m, and both the setup and hold priority values are 4.
PCC-to-R2
and it is being set up from Router
is PCC-R0-R1-R2. The
is PCC-R3-R2. The bandwidth
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