rfc8924v3.txt   rfc8924.txt 
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The focus of this document is to provide an architectural framework The focus of this document is to provide an architectural framework
for SFC OAM, particularly focused on the aspect of the Operations for SFC OAM, particularly focused on the aspect of the Operations
component within OAM. Actual solutions and mechanisms are outside component within OAM. Actual solutions and mechanisms are outside
the scope of this document. the scope of this document.
1.2. Acronyms and Terminology 1.2. Acronyms and Terminology
1.2.1. Acronyms 1.2.1. Acronyms
SFC: Service Function Chain BFD Bidirectional Forwarding Detection
SFF: Service Function Forwarder CLI Command-Line Interface
SF: Service Function DWDM Dense Wavelength Division Multiplexing
SFP: Service Function Path E-OAM Ethernet OAM
RSP: Rendered Service Path hSFC Hierarchical Service Function Chaining
NSH: Network Service Header IBN Internal Boundary Node
VM: Virtual Machine IPPM IP Performance Metrics
OAM: Operations, Administration and Maintenance MPLS Multiprotocol Label Switching
IPPM: IP Performance Metrics MPLS_PM MPLS Performance Measurement
BFD: Bidirectional Forwarding Detection NETCONF Network Configuration Protocol
NVO3: Network Virtualization over Layer 3 NSH Network Service Header
SNMP: Simple Network Management Protocol NVO3 Network Virtualization over Layer 3
NETCONF: Network Configuration Protocol OAM Operations, Administration, and Maintenance
E-OAM: Ethernet OAM POS Packet over SONET
MPLS_PM: MPLS Performance Measurement RSP Rendered Service Path
POS: Packet over SONET SF Service Function
DWDM: Dense Wavelength Division Multiplexing SFC Service Function Chain
hSFC: Hierarchical Service Function Chaining SFF Service Function Forwarder
IBN: Internal Boundary Node SFP Service Function Path
MPLS: Multiprotocol Label Switching SNMP Simple Network Management Protocol
TRILL: Transparent Interconnection of Lots of Links TRILL Transparent Interconnection of Lots of Links
CLI: Command-Line Interface VM Virtual Machine
1.2.2. Terminology 1.2.2. Terminology
This document uses the terminology defined in [RFC7665] and This document uses the terminology defined in [RFC7665] and
[RFC8300], and readers are expected to be familiar with it. [RFC8300], and readers are expected to be familiar with it.
2. SFC Layering Model 2. SFC Layering Model
Multiple layers come into play for implementing the SFC. These Multiple layers come into play for implementing the SFC. These
include the service layer and the underlying layers (network layer, include the service layer and the underlying layers (network layer,
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some of the underlay and overlay networks. Tools like ping and trace some of the underlay and overlay networks. Tools like ping and trace
are in existence to perform connectivity checks and trace are in existence to perform connectivity checks and trace
intermediate hops in a network. These tools support different intermediate hops in a network. These tools support different
network types, like IP, MPLS, TRILL, etc. Ethernet OAM (E-OAM) network types, like IP, MPLS, TRILL, etc. Ethernet OAM (E-OAM)
[Y.1731] [EFM] and Connectivity Fault Management (CFM) [DOT1Q] offer [Y.1731] [EFM] and Connectivity Fault Management (CFM) [DOT1Q] offer
OAM mechanisms, such as a continuity check for Ethernet links. There OAM mechanisms, such as a continuity check for Ethernet links. There
is an effort around NVO3 OAM to provide connectivity and continuity is an effort around NVO3 OAM to provide connectivity and continuity
checks for networks that use NVO3. BFD is used for the detection of checks for networks that use NVO3. BFD is used for the detection of
data-plane forwarding failures. The IPPM framework [RFC2330] offers data-plane forwarding failures. The IPPM framework [RFC2330] offers
tools such as OWAMP [RFC4656] and TWAMP [RFC5357] (collectively tools such as OWAMP [RFC4656] and TWAMP [RFC5357] (collectively
referred as IPPM in this section) to measure various performance referred to as IPPM in this section) to measure various performance
metrics. MPLS Packet Loss Measurement (LM) and Packet Delay metrics. MPLS Packet Loss Measurement (LM) and Packet Delay
Measurement (DM) (collectively referred as MPLS_PM in this section) Measurement (DM) (collectively referred to as MPLS_PM in this
[RFC6374] offer the ability to measure performance metrics in MPLS section) [RFC6374] offer the ability to measure performance metrics
networks. There is also an effort to extend the toolset to provide in MPLS networks. There is also an effort to extend the toolset to
connectivity and continuity checks within overlay networks. BFD is provide connectivity and continuity checks within overlay networks.
another tool that helps in detecting data forwarding failures. BFD is another tool that helps in detecting data forwarding failures.
Table 1 below is not exhaustive. Table 1 below is not exhaustive.
+============+==============+============+=======+=============+ +============+==============+============+=======+=============+
| Layer | Connectivity | Continuity | Trace | Performance | | Layer | Connectivity | Continuity | Trace | Performance |
+============+==============+============+=======+=============+ +============+==============+============+=======+=============+
| Underlay | Ping | E-OAM, BFD | Trace | IPPM, | | Underlay | Ping | E-OAM, BFD | Trace | IPPM, |
| network | | | | MPLS_PM | | network | | | | MPLS_PM |
+------------+--------------+------------+-------+-------------+ +------------+--------------+------------+-------+-------------+
| Overlay | Ping | BFD, NVO3 | Trace | IPPM | | Overlay | Ping | BFD, NVO3 | Trace | IPPM |
| network | | OAM | | | | network | | OAM | | |
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