ITU - Telecommunication Standardization Sector

Geneva, 19 February 2002


QUESTIONS:    Q.14/15

SOURCE:         Rapporteur

TITLE:               Communication Statement to IETF CCAMP Working Group on signalling protocol work in Q.14/15





TO:                    IETF CCAMP Working Group

CC:                    Optical Internetworking Forum (OIF)


APPROVAL:      Agreed to at 11 – 15 February 2002 Darmstadt Rapporteur Meeting

FOR:                 Action

DEADLINE:       None


CONTACT:       Hing-Kam Lam                                                      Tel:        +1-732-949-8338

101 Crawfords Corner Road                                Fax:       +1-732-949-5055

Holmdel, NJ 07733, USA                                      Email:




Q.14/15 would like to inform the IETF CCAMP Working Group that Q.14/15 is in the midst of initiating work efforts in defining the protocol specific work for the ASON signalling protocols. Q.14/15 has initiated work on:

-          G.7713.1, which is based on the Q.2931 (ATMF UNI and PNNI) signalling protocol

-          G.7713.2, which is based on the GMPLS RSVP-TE signalling protocol

-          G.7713.3, which is based on the GMPLS CR-LDP signalling protocol

In the upcoming Q.14/15 meetings, these specific protocols will each be analysed against the set of requirements from G.807/Y.1302, G.8080/Y.1304 and G.7713/Y.1704. Q.14/15 will be evaluating any possible modifications that may be needed to each of the specific protocols in order to meet the requirements.

We have identified some requirements that do not appear to be met by the existing GMPLS protocols, for examples

1.      Call & Connection separation, e.g., a call provides the service relationship, which may support connection operations as part of a call.

2.      Additional error codes/values, for example, for connection rejection (invalid connection ID).

3.      Restart mechanisms: Depending on the introduction by the ITU of additional control plane resiliency requirements, enhancements of the protocol (RSVP-TE, CR-LDP) "graceful restart" mechanisms may be required.

4.      Protocol enhancements in CR-LDP for support of crankback capability from intermediate nodes.

We wish that as we continue our review of these protocols you will be able to provide us with recommendations on how to close these and future issues.

Four documents are available at the ITU-T public ftp site for your information. These include the three draft Recommendations as described above, plus the template of requirements to be used in evaluating the specific protocols. Q.14/15 looks forward to your input to help progress this work in Q.14/15.

The four documents may be obtained from