[routing-wg] Routing at the IETF: a view before 103

Hi there,

A brief overview of what is happening in the IETF in working groups 
related to routing. This is not necessary a complete list, and given the 
proximity of upcoming IETF 103 meeting, there will be a large number of 
new submissions and changes to existing documents in the coming weeks. 
This list is built based on the state of WGs and documents just prior to 
RIPE 77 meeting. The goal is to provide an informal description of what 
is happening on the protocol and technology development, and what 
eventually may come to operations communities in not too distant future.

The intention is to draw attention of RIPE Routing WG participants onto 
what is in development in the IETF, with a particular wish to bring in 
the comments and feedback from RIPE community into the IETF. If you see 
a topic being of interest and relevant to your environment, please 
consider reviewing the documents and providing feedback, either to the 
WG mailing list, to the document authors, or to WG chairs. If you would 
be interested in becoming more involved in IETF document review but 
either hesitate or are not certain what that might look like and what 
the time commitment would be - please reach to me either in the hallway 
or via mail.


BABEL
BABEL WG works on evolutional development of a distance vector routing 
protocol targeted for both robust and lossy networks, with a set of 
properties that result in fast convergence in case of arbitrary topology 
changes, possibly trading the optimality of the topology for that.
- Base specification. The main focus is to move BABEL specification to a 
standards track from the previous experimental one, providing details on 
ambiguous or underspecified protocol operation aspects. Reading list: 
draft-ietf-babel-rfc6126bis.
- BABEL over DTLS. BABEL itself does not have mechanisms for neighbour 
authentication and exchanged message integrity, DTLS is proposed to be 
used for that. Reading list: draft-ietf-babel-dtls.
- Modelling and manageability. An initial work on manageability aspects 
of BABEL, currently defining an informational model, eventually 
providing a YANG data model too. Reading list: 
draft-ietf-babel-information-model.


BESS
BESS WG covers connectivity services that use BGP in one or another form 
for their operation – L3VPN, L2VPN, EVPN, and numerous their 
derivatives. At the current time the major focus is on EVPN features and 
extensibility, the rest of the topics are in maintenance mode.
- EVPN maintenance. Multi-attachment operation, optimizations of 
multipoint frame distribution, service redundancy. Reading list: 
draft-ietf-bess-evpn-bum-procedure-updates, 
draft-ietf-bess-evpn-inter-subnet-forwarding.
- L2VPN and L3VPN YANG models. Configuration and monitoring models for 
network elements providing both L2VPN and L3VPN connectivity services. 
Not to be confused with L2 and L3 service models. Reading list: 
draft-ietf-bess-l3vpn-yang, draft-ietf-bess-l2vpn-yang.


BFD
BFD WG focuses on evolution and extensions of BFD protocol and its 
applicability to various dataplanes and encapsulations. The core 
specification of BFD is complete and is universally deployed, the 
majority of the current work is on extensions required for new 
encapsulations and use cases.
- Multipoint BFD. A mechanism that allows for BFD to validate 
reachability in multipoint environments. The nature of multipoint 
connectivity requires the introduction of different roles for BFD 
session head and session tails, it is no longer a fully symmetric 
protocol. Reading list: draft-ietf-bfd-multipoint , 
ietf-bfd-multipoint-active-tail.
- BFD YANG models. An NMDA compatible YANG model for managing and 
monitoring BFD. Reading list: draft-ietf-bfd-yang.
- Authentication extensions. The cost of authenticating every BFD packet 
makes it impractical if not completely undeployable. However, the 
information that would really need to be authenticated does not 
necessary repeat in every BFD packet, therefore it may be enough to 
authenticate only those BFD packets that signal a state change. Another 
extension is for a change on how sequence numbers are generated. Reading 
list: draft-ietf-bfd-optimizing-authentication, 
draft-ietf-bfd-secure-sequence-numbers.
- Unsolicited BFD. A seemingly simpler mechanism than Seamless BFD for 
establishing a BFD session to an endpoint that has no specific initial 
session configuration. Reading list: draft-chen-bfd-unsolicited.


BIER
BIER WG focuses on defining a new dataplane encapsulation and a new 
forwarding paradigm for multipoint distribution of packets – ie, 
redefining multicast forwarding in a scalable and deterministic way. The 
core of BIER specification is complete, current work focuses on various 
extensions and integration with other technology components, as well as 
looking into usability and deployment aspects of it.
- BIER specification. The core BIER specification is complete. There are 
extensions for various control plane components that need to be 
finalized. Reading list: RFC8279, RFC8296, draft-ietf-bier-evpn, 
draft-ietf-bier-path-mtu-discovery.
- BIER integration. Not all BIER deployments will be greenfield, there 
is a need for interoperability mechanisms with existing multicast 
environments. Reading list: draft-ietf-bier-use-cases, 
draft-przygienda-bier-migration-options, draft-ietf-bier-pim-signaling.
- BIER manageability. YANG model for configuration and monitoring of 
BIER nodes. Reading list: draft-ietf-bier-bier-yang.


CCAMP
CCAMP WG works on defining a set of control plane components for 
non-packet based, predominantly optical transport networks. This is a 
long lived WG, having completed most of the core protocol work a while 
ago, with the current focus being on maintenance and extensions, and a 
larger amount of work on manageability aspects of transport networks.
- Modelling. YANG models for transport network topologies and individual 
connectivity features. Reading list: draft-ietf-ccamp-wson-yang, 
draft-ietf-ccamp-l1csm-yang, draft-ietf-ccamp-alarm-module.

DETNET
DETNET WG addresses the problem of deterministic operation in packet 
based networks where packet delivery timing and reliability have strict 
bounds. A relatively new WG, looking into the applicability of existing 
IETF technologies to time sensitive data communication systems within a 
bounded domain.
- Overall architecture. Definition of main assumptions of how 
deterministic traffic flows could be mapped onto packet network 
infrastructure, what would the requirements be, and how those 
requirements could be fulfilled. Reading list: 
draft-ietf-detnet-architecture, draft-ietf-detnet-problem-statement, 
draft-ietf-detnet-use-cases.
- IP and MPLS dataplanes. How IP, and MPLS and its derivatives could be 
applied to transport time sensitive payloads, what would be the 
assumptions and limitations made, and what is required for 
extensibility. Reading list: draft-ietf-detnet-dp-sol-ip , 
draft-ietf-detnet-dp-sol-mpls.
- Bounded latency. A subset of new work on characterizing the total end 
to end latency and amount of required resources for zero loss 
transmission of flows. Reading list: 
draft-geng-detnet-requirements-bounded-latency, 
draft-finn-detnet-bounded-latency,


I2RS
I2RS WG works on defining programmatic interfaces to routing system – a 
way of accessing and manipulating routing information by ways other than 
via routing protocols. Most of the chartered work is done, there is 
little activity, the working group is approaching its closure, and, 
sadly, little of practical applicability exists in the developed 
mechanisms.


IDR
IDR WG focuses on the protocol that glues the Internet together – BGP. 
While the core specification of BGP has been stable for a long time, 
there is a large amount of extensions and new features being worked on.
- Extended messages. Initially BGPsec signed path attributes, and 
nowadays new address families and general update packing efficiency are 
being affected by a limit of a BGP message size of 4096 octets. A simple 
mechanism allows for extending BGP messages to carry payload of up to 
64K octets. Reading list: draft-ietf-idr-bgp-extended-messages.
- Flowspec maintenance. A set of clarifications and fixes to the base 
Flowspec document RFC5575, and various optimizations for traffic 
matching and redirect operations. Reading list: 
draft-ietf-idr-rfc5575bis, draft-ietf-idr-flowspec-interfaceset, 
draft-ietf-idr-flowspec-path-redirect, 
draft-khare-idr-bgp-flowspec-payload-match.
- RS BFD. A mechanism for BFD based dataplane connectivity validation, 
especially in route server environments. Reading list: 
draft-ietf-idr-rs-bfd.
- New BGP communities. There are still not enough of different types of 
BGP communities. :-) Extended communities are not fully AS4 capable, and 
various VPN address families will require that. Reading list: 
draft-heitz-idr-extra-extended-community, 
draft-ietf-idr-wide-bgp-communities.
- BGP autodiscovery. There appears to be an increased interest in 
various forms of BGP neighbour and topology discovery mechanisms, mostly 
targeted to densely interconnected topologies. Reading list: 
draft-raszuk-idr-bgp-auto-session-setup, 
draft-xu-idr-neighbor-autodiscovery, draft-acee-idr-lldp-peer-discovery.
- Optimal reflection. Route reflectors help with overall routing 
information state reduction but at a cost of topology hiding, and 
providing one set of best paths for all clients. An extension to 
reflector operation allows for different clients to receive different 
sets of best paths. Reading list: 
draft-ietf-idr-bgp-optimal-route-reflection.
- Route refresh extensions: Route refresh is a widely deployed mechanism 
and is considered to be a best practice. An extension allows for a more 
granular request for refreshing a specific address family or a set of 
prefixes or route types. Reading list: draft-idr-bgp-route-refresh-options.
- BGP compression. The increase of the amount of state that needs to be 
transferred between the peers directly affects the amount of octets that 
need to be sent and received. Observing that there is a large number of 
repetitive patterns in BGP payload, a mechanism to bundle together and 
compress BGP messages is defined. Reading list: 
draft-przygienda-idr-compressed-updates.
- Modelling. A YANG model for configuration of both BGP sessions and BGP 
routing policy. Reading list: draft-ietf-idr-bgp-model.

LISP
LISP WG works on a routing and addressing architecture that separates 
routing and node identification namespaces and allow for routing system 
scalability to extend substantially beyond current single namespace 
approach. Majority of core protocol work is complete, current work 
focuses on extensibility and implementation of LISP based connectivity 
services.
- Core protocol maintenance. Maintenance and extensions of core LISP 
architectural model and control plane components. Reading list: 
draft-ietf-lisp-rfc6830bis, draft-ietf-lisp-rfc6833bis
- Modelling. LISP YANG model for configuration and management. Reading 
list: draft-ietf-lisp-yang.
- Mapping system evolution. Reading list: draft-ietf-lisp-pubsub.
- Mapping system security. A set of mechanisms for ensuring the 
authentication and integrity of mapping system information. Reading 
list: draft-ietf-lisp-sec.


LSR
LSR WG focuses on evolution of IS-IS and OSPF routing protocols, it is a 
merger of previously separate ISIS and OSPF WGs. Majority of the work is 
on extensions needed for other WGs, with a new work gaining traction in 
defining a more scalable IGP operation in densely interconnected 
environments.
- IS-IS over TCP. IGPs generally use their own transport mechanisms and 
as a result the complexity required for ensuring robust and 
deterministic behaviour of an IGP during the periods of synchronization 
of large amounts of state is both nontrivial and proprietary. Offloading 
a large part of that complexity to underlying reliable transport may 
seem to be a practical way forward, and a proposed mechanism uses TCP 
for point-to-point dissemination of state between IS-IS routers. Reading 
list: draft-hsmit-lsr-isis-flooding-over-tcp.
- IGP flooding optimizations. A set of proposed mechanisms to limit the 
over-redundant flooding of the topology information distribution by 
constraining a set of links over which it gets propagated. Reading list: 
draft-li-dynamic-flooding, draft-cc-isis-flooding-reduction.
- Flexible IGP algorithms. A mechanism to define a user-specified 
topology calculation methodology with a set of metric types and 
constraints for building other than shortest metric based topologies. 
This allows for an IGP to calculate the specific topology itself and not 
rely on the external TE component. Reading list: draft-ietf-lsr-flex-algo.
- Topology scalability. A quarter of century ago ATM PNNI defined 
multilevel routing protocol loosely based on OSPF for addressing 
topology information overload problems, and that worked. Current 
developments for adjusting IGPs to operate well in large and densely 
interconnected meshes start to look into a similar direction by 
increasing the number of topology levels upward from two. Reading list: 
draft-li-hierarchical-isis, draft-li-area-abstraction.

LSVR
LSVR WG is a new working group focusing on development if a 
purpose-built routing protocol based on BGP components and targeted for 
a densely interconnected networks, with a particular focus to DC use cases.
- Problem space. Definition of a problem to be solved and reasoning why 
a new routing protocol would be of value and need in the context of DC 
routing. Reading list: draft-ietf-lsvr-applicability. :
- BGP SPF. The mechanics of operation of a proposed link state vector 
routing protocol. In essence, BGP transport intermixed with SPF topology 
calculation. Reading list: draft-ietf-lsvr-bgp-spf.

MANET
MANET WG focuses on developing of routing protocols for environments 
exhibiting many changes in topology and link availability.
- DLEP extensions. Reading list: 
draft-ietf-manet-dlep-credit-flow-control, 
draft-ietf-manet-dlep-traffic-classification, 
draft-ietf-manet-dlep-multi-hop-extension, 
draft-ietf-manet-dlep-lid-extension.

MPLS
MPLS WG coordinates the development of MPLS dataplane encapsulation and 
control plane components required for its operation. Being an active WG 
for a third decade now, majority of core protocol work is complete, the 
focus is on maintenance and extensions required for adjacent uses of 
MPLS derivative technologies, and manageability.
- MPLS modelling. Definition of YANG models for configuration and 
operation of MPLS functionality. Reading list: 
draft-ietf-mpls-base-yang, draft-ietf-mpls-static-yang.

NVO3
NVO3 WG works on IP based encapsulations for network virtualization, 
with the focus on DC environments.
- Geneve. VXLAN encapsulation, while not a product of an IETF WG, proved 
to be successful in the industry, reaching a wide universal deployment. 
As the requirements for encapsulation increased in order to fulfil 
different use cases, it became evident that VXLAN has fundamental 
limitations and a new encapsulation protocol is required. The work 
resulted in selecting Geneve as a successor to VXLAN, providing 
practical extensibility, hardware implementation efficiency, and 
security awareness. The work on Geneve is nearing completion. Reading 
list: draft-ietf-nvo3-encap, draft-ietf-nvo3-geneve.
- EVPN control plane for NVO3. While NVO3 WG is not directly chartered 
to work on control plane components, practical deployments will be and 
are based on some form of control plane. EVPN is one possible candidate 
of such control plane, providing autodiscovery of participating NVEs and 
the distribution of addresses and their mappings. Reading list: 
draft-ietf-nvo3-evpn-applicability, draft-boutros-bess-evpn-geneve.
- NVO3 security. An analysis of security requirements both for the NVO3 
environment and NVO3 dataplane encapsulators. Reading list: 
draft-mglt-nvo3-geneve-security-requirements.

PALS
PALS WG works on maintenance of LDP signalled services that use 
pseudowires.
- Ethernet PW CW. Mandating the use of control word for Ethernet 
pseudowires in order to avoid the possible aliasing problems based on 
inability to deterministically distinguish payload data from 
encapsulated frame header. Reading list: draft-ietf-pals-ethernet-cw.
- Maintenance and extensions. The WG mostly focuses on extensions of 
existing signalling mechanisms and services, with nothing exceptional to 
report at this time.

PCE
PCE WG works on defining mechanisms for centralized topology computation 
for MPLS-derivative networks.
- Applicability to Segment Routing. Reading list: 
draft-ietf-pce-segment-routing.
- PCE modelling and manageability. Reading list: draft-ietf-pce-pcep-yang.

PIM
PIM WG works on development of IP multicast routing and signalling 
control plane components.
- YANG models for IP multicast. Configuration and maintenance models for 
IP multicast control protocols and network element operation. Reading 
list: draft-ietf-pim-msdp-yang, draft-ietf-pim-igmp-mld-yang.
- Protocol maintenance and extensions. One of the aspects related to PIM 
stability on multi-access networks is the proper election and 
maintenance of a DR. Trying to rely on the implicit expiration of DR 
timers and switching over only then does not necessarily lead to fast 
convergence, and does not allow for a deterministic selection of backup 
DR in advance. A proposed extension allows for carrying information 
about candidate DR nodes and makes a way for off-PIM liveness 
validation. Reading list: draft-ietf-pim-dr-improvement.

RIFT
RIFT WG works on a specialised routing protocol having a mixture of 
link-state and distance-vector operations, targeted for a specific 
Clos-based topologies that exhibit a large number of interconnections 
between points in the network.
- Base specification. As for a relatively new WG, the current main focus 
is on base specification, including protocol mechanics and encodings, 
and targeted use cases. Reading list: draft-ietf-rift-rift, 
draft-filyurin-rift-access-networks.
- Modelling. A configuration and operation YANG model for RIFT nodes. 
Reading list: draft-zhang-rift-yang.

ROLL
ROLL WG works on development of routing protocols for low power and 
lossy networks and nodes that have limited communication resources.
- RPL applicability. A view on applicability of RPL routing protocol to 
low power and lossy networks. Reading list: 
draft-ietf-roll-rpl-observations.

RTGWG
RTGWG WG focuses on new and innovative topics related to routing that 
are either too wide for a specific existing subject WG at the time, or 
too narrow and not fitting any particular WG. It acts as an initial 
filter and redirection mechanism for new work coming into routing area.
- BGP PIC. A set of mechanisms and recommendations on how a node can 
implement routing and forwarding logical data structures in order to 
limit the scope of changes needed to be done on the node related to the 
changes in routing topology, particularly targeting BGP environment. 
Reading list: draft-ietf-rtgwg-bgp-pic.
- LNE and NI models. A set of YANG models describing the partitioning of 
a network element into instances or VRFs and how it can be represented 
as a hierarchy of manageable entities from the control plane component 
perspective. Reading list:
- Routing policy modelling. A YANG model defining how a local network 
element routing policy (not the BGP routing policy) could be represented 
and used. Reading list:

SFC
SFC WG works on definition of an overall architecture and technology 
components for service chaining.
- SFC OAM. A set of mechanisms for allowing to monitor and validate the 
operation of SFC environments. Reading list: draft-ietf-sfc-oam-framework.
- SFC and In-situ OAM integration. Reading list: 
draft-ietf-sfc-ioam-nsh, draft-ietf-sfc-proof-of-transit.

SPRING
SPRING WG focuses on overall architectural development of Segment 
Routing and its associated protocols and mechanisms, as well as focusing 
on operational and usability aspects of it.
- SR MPLS dataplane. The components and protocol mechanics for Segment 
Routing using MPLS dataplane. Reading list: 
draft-ietf-spring-segment-routing-mpls.
- SR policy routing. A framework on how SR components could be bound 
together and used for implementation of a scalable source based routing 
mechanism. Reading list: draft-ietf-spring-segment-routing-policy.

TEAS
TEAS WG focuses on aspects related to traffic engineering technologies 
for MPLS and derivative dataplanes and signalling components. The core 
set of specifications has been completed, current work focuses on 
extensions and feature maintenance, and on development of YANG models.
- TE topology modelling. Reading list: draft-ietf-teas-yang-te, 
draft-ietf-teas-yang-te-topo, draft-ietf-teas-te-topo-and-tunnel-modeling.
- Enhanced VPN. A feasibility study on what IETF technology components 
could be reused and what needs to be developed for VPNs that would allow 
for stricter resource guarantees and awareness to network applications. 
Reading list: draft-dong-teas-enhanced-vpn.

MBONED
MBONED WG focuses on deployment and operation aspects of multicast 
technologies and networks.
- YANG model for multicast configuration and monitoring. Reading list: 
draft-ietf-mboned-multicast-yang-model.
- Multicast in DC environments. Multicast traffic especially in DC 
environments has been frowned upon for a long time, and the typical 
application communication pattern was predominantly point to point. Both 
of those assumptions start to change, and an analysis of what the effect 
of bringing in multicast at scale into DC environment would be needs to 
be performed. Reading list: draft-ietf-mboned-dc-deploy.
- Multicast in wireless environments. IEEE 802 wireless is not the 
mostly friendly environment for IP multicast. Recommendations both for 
deployment, and for cross-SDO development of wireless and multicast 
technologies, are analysed. Reading list: 
draft-ietf-mboned-ieee802-mcast-problems.

GROW
GROW WG focuses on operational aspects of global BGP routing system and 
works on toolkits, methodologies, and protocols targeted for BGP 
operation and maintenance.
- BMP maintenance. BMP is starting to get operational traction and thus 
limitations and shortcomings of the original design show up. The current 
work focuses on allowing BMP to be able to export information about 
local and outgoing RIBs, and a rather large item of work on extending 
the format and capabilities of Route Monitoring message. Reading list: 
draft-ietf-grow-bmp-adj-rib-out, draft-ietf-grow-bmp-local-rib, 
draft-hsmit-bmp-extensible-routemon-msgs.
- Actions on Well-known communities. Different BGP implementations 
behave differently when setting or removing BGP standard communities, 
and this may result in inconsistent routing policy operation. The 
document provides the current list of vendor behaviour, and guidelines 
on what vendors should do for their implementations. Reading list: 
draft-ietf-grow-wkc-behavior.
- RPKI AS Cones. A mechanism for aggregation of a list of client AS 
numbers for purposes of RPKI validation. Reading list: 
draft-ietf-grow-rpki-as-cones.

SIDR
SIDR WG has completed its chartered work and has been closed recently. 
The main deliverables of SIDR are BGPsec and RPKI.
- BGPsec protocol specification. Reading list:RFC8205, RFC8206, RFC8207.
- RTR maintenance. Reading list: RFC8210, RFC8211.

SIDROPS
SIDROPS WG focuses on deployment and operational aspects of global 
routing system security mechanisms by providing guidance on how 
protocols and mechanisms developed in SIDG WG couls and should be 
deployed and used, and acting as a distributor of operational knowledge.
- TAL HTTPS transport. An extension allowing for use of HTTPS in 
addition to rsync for fetching trust anchors. Reading list: 
draft-ietf-sidrops-https-tal.
- ASPA. AS Provider Authorization, a simple yet practical way of 
checking the validity of an AS path. Reading list: 
draft-azimov-sidrops-aspa-profile, draft-azimov-sidrops-aspa-verification.

OPSAWG
A WG for generic operations related topics that do not have any other 
more suitable or more specific WG.
- TACACS. The documentation of the current deployed TACACS protocol, 
with the explicit goal of not defining new features and extensions but 
documenting the current state of the implemented and operated protocol. 
The specification carries more of a historical and informational value 
of what has been implemented. Reading list: draft-ietf-opsawg-tacacs. 
There is another document on defining YANG model for TACACS, it is an 
early start of the work and the scope is likely too narrow and too 
focused on TACACS only instead of having a broader scope of extending 
RFC7317 system authentication model to cover multiple authentication, 
authorization, and accounting mechanisms. Reading list: 
draft-zheng-opsawg-tacacs-yang.
- IPFIX flow export based on BGP communities. Similar to NetFlow/IPFIX 
export of AS numbers and IP addresses, there may be use cases where a 
more granular and user-controlled marking of flows might be needed. The 
proposal defines a set of IPFIX information elements and a mechanism for 
exporting flows based on BGP communities of various types. Reading list: 
draft-ietf-opsawg-ipfix-bgp-community.
- NAT modelling. A YANG model for configuration of various forms of 
NATs, providing a flexible framework for possible future additions of 
new NATs. Reading list: draft-ietf-opsawg-nat-yang.
- Secure Device Install. A discussion in early stages on a simple 
proposal of zero-touch initial provisioning mechanism without 
requirement for remote hands intervention into network element 
configuration. With the cooperation of network element manufacturer, the 
initial configuration is encrypted with the public key of the node, thus 
locking the configuration to the intended target node and protecting it 
from the third parties that may be involved in the initial provisioning 
process. Reading list: draft-wkumari-opsawg-sdi.

KARP
KARP WG was focusing on transport security aspects of routing protocols, 
and has been closed a while ago due to the lack of energy. There seems 
to be a growing interest in the community on revisiting some of the work 
items of KARP, especially on developing a successor mechanism to TCP MD5 
authentication signatures.
- Routing transport security. TCP-AO has been around for a long time, 
however, there are no deployments as there are no practical 
implementations. Reading list: RFC5925.
- Using IKE for routing protocols. This is a “homeless” document at this 
time, but worth reading and commenting on. The overall approach is quite 
simple – IKE is meant for distributing keying material, and if instead 
of IPsec components the users of that keying material would be routing 
protocols – could this work? It appears that it could, the overall 
solution is not that complex. Reading list: draft-mahesh-karp-rkmp.


NETCONF
NETCONF WG focuses on development of protocols components for evolving 
model based network management approaches. The core of both NETCONF and 
RESTCONF protocol work is complete, the focus is on extensions and 
adjustment to operational requirements as a feedback to deployments.
- Event notifications and model based telemetry. Mechanisms for 
receiving events and data from network elements, as opposed to sending 
configuration and state into network elements. Reading list: 
draft-ietf-netconf-netconf-event-notifications, 
draft-ietf-netconf-yang-push.
- Zero-touch provisioning. A set of mechanisms for initial bringup of 
network element.Reading list: draft-ietf-netconf-zerotouch.


NETMOD
NETMOD WG works on evolution of YANG modelling language and overall 
modelling methodology, as well as working on “core” set of models.
- Datastore architecture. An architectural framework for allowing the 
configuration to be represented and interpreted in more than a single 
context, reflecting the operational reality of having the target 
configuration not necessary corresponding to the actual operating 
parameters. Reading list: RFC8342, draft-ietf-netmod-schema-mount.

L2SM, L3SM
L2SM and L3SM WGs were a short lived and narrow focused on developing 
the service model for L2VPN and L3VPN connectivity services – contrary 
to the work happening in BESS WG on element level configuration models 
for L2VPN and L3VPN. Reading list: RFC8049, RFC8466.

IPPM
IPPM WG works on measurement instrumentation – defining metrics, 
methodologies, and protocol extensions for measurement of IP network 
performance.
- In-situ OAM. A set of mechanisms and encapsulation extensions that 
allow for recording of the measurements that are applicable to the 
transit packet within the packet itself. Reading list: 
draft-ietf-ippm-ioam-data , draft-brockners-ippm-ioam-geneve.
- AURA. A multipath-aware measurement methodology and mechanisms. 
Reading list: draft-ietf-ippm-route.

Other interesting assorted reading materials
- FAST. An approach to coordination of and awareness to bidirectional 
routing. Reading list: draft-herbert-route-fast.
- Protocol wire image. A methodology for analysing of visibility of 
protocol signatures and inferred working to a side observer. Reading 
list: draft-iab-wire-image.
- Path signals. A set of analysis and recommendations on side effects of 
increasing use of encryption in packet networks. Reading list: 
draft-iab-path-signals.



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