RFC 5440, "Path Computation Element (PCE) Communication Protocol (PCEP)", March 2009

Note: This RFC has been updated by RFC 7896, RFC 8253, RFC 8356, RFC 9488, RFC 9756

Errata ID: 2941
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Ramon Casellas
Date Reported: 2011-08-18
Verifier Name: Adrian Farrel
Date Verified: 2011-08-19

Section 10.7.1 says:

 o  PCEP uses a single registered port for all communications.  The
    PCE SHOULD listen for TCP connections only on ports where
    communication is expected.

 o  The PCE SHOULD NOT allow parallel TCP connections from the same
    PCC on the PCEP-registered port.

It should say:

 o  PCEP uses a single registered port for all communications.  The
    PCE MUST listen for TCP connections only on ports where
    communication is expected.

 o  The PCE MUST NOT allow parallel TCP connections from the same
    PCC on the PCEP-registered port.

Notes:

RFC 5440 is not consistent regarding the use of RFC2119 keywords. In section 5 the RFC states "MUST" regarding the registered port and in section 10.7.1 it is stated "SHOULD". Section 10.7.1 seems to imply the PCE could listen at any port (which is technically possible, but not in line with the rest of the document). Finally, the restriction about multiple connections is confusing: Section 4.2.1 "Only one PCEP session can exist between a pair of PCEP peers at any one time" but section 10.7.1 uses "SHOULD NOT". Technically, without the TCP source restriction, it should be possible to accept multiple connections from a PCEP peer, but such a change could have broader implications

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