Pcep Session Establishment And Maintenance; Figure 18 Pcep Session Initialization - Nokia 7705 SAR-W Series Manual

Service aggregation router, mpls

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4.3 PCEP Session Establishment and

PCEP operates over TCP using destination TCP port 4189. The PCC always initiates

the connection. When the user configures the PCEP local address and the peer

address on the PCC, the PCC initiates a TCP connection to the PCE. When a

connection is established, the PCC and PCE exchange OPEN messages, which

initializes the PCEP session and exchanges the session parameters to be

The PCC always checks first to determine if the remote PCE address is reachable

out-of-band via the management port. If the remote address is not reachable, the

PCC will try to reach the remote PCE address in-band. When the session comes up

out-of-band, the system IP address is always used; the local address configured by

the user is ignored and is only used for an in-band session.

A keepalive mechanism is used as an acknowledgment of the acceptance of the

session within the negotiated parameters. It is also used as a maintenance function

to detect whether or not the PCEP peer is still alive.

The negotiated parameters include the keepalive timer and the dead timer, and one

or more PCEP capabilities such as support of stateful PCE and the LSP Path type.

The PCEP session initialization steps are illustrated in

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PCEP Session Initialization

PCEP KEEP ALIVE

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PCEP KEEP ALIVE