Liaison statement
LS171 - Status of OMCI for MPLS and MPLS pseudowire configuration

Submission date 2010-05-05
From ITU-T SG 15 (Greg Jones)
To IETF MPLS WG, IETF PWE3 WG, Broadband Forum (,,,
Response contact,,
Technical contact,
Purpose For information
Attachments LS171 - Status of OMCI for MPLS and MPLS pseudowire configuration - pdf body
LS171 - Status of OMCI for MPLS and MPLS pseudowire configuration - pdf attach1
LS171 - Status of OMCI for MPLS and MPLS pseudowire configuration - pdf attach2
Dear members of the IETF MPLS and PWE3 working group, and BBF, 

There is a trend that operators are deploying MPLS and PWE3 in access
networks, especially in an access network of G-PON (Gigabit-capable
Passive Optical Networks). 
ITU-T Q2/15 has developed a series of recommendations on Passive
Optical Networks (PON). G-PON systems are characterized, in general, by
an Optical Line Termination (OLT) system, and an Optical Network Unit
(ONU), with a passive Optical Distribution Network (ODN)
interconnecting them. There is, in general, a one-to-many relationship
between the OLT and the ONUs respectively. 
The ONU management and control interface (OMCI) is a management channel
between the OLT and the ONUs that supports Ethernet, equipment,
subscriber interface, and subscriber feature management. OMCI specifies
the managed entities of a protocol-independent management information
base (MIB) module that models the resources and services in an ONU.
Through standardized OMCI signalling, OLT builds up its management
bonds with ONUs. OMCI is standardized in G.984.4 and G.988.
G.984.4 Amendment 2, extends the functions that can be configured using
OMCI to include MPLS and MPLS pseudowire termination points at an ONU.
This allows seamless integration of MPLS and MPLS pseudowire services
with a PON.
As OMCI is a management protocol, we believe this is not in conflict
with the IETF's development of the data plane and control plane for
MPLS and MPLS pseudowires. We do not intend any changes to the MPLS and
pseudowire architectures, and we intend our work to be in line with the
IETF RFCs that define MPLS and MPLS pseudowires. We see a benefit for
the application of MPLS and MPLS pseudowires in access networks by
facilitating label provisioning via a management system, 
The subject of generic OMCI for MPLS configuration is still open for
further study in Q2/15 and will be continued in G.988 era for the next
generation of PON.  We hope to cooperate with you in this standards
development work.  
Q2/15 appreciates further communication from the MPLS and PWE3 working
groups in IETF if there are any comments or requests.  G.984.4 and
G.984.4 Amendment 2 are attached for your information. Our next meeting
is planned for May 31, 2010.