Network Working Group Young Lee
Dhruv Dhody
Internet Draft Huawei
Intended status: Informational Sergio Belotti
Alcatel-Lucent
Expires: October 2015
Khuzema Pithewan
Infinera
Daniele Ceccarelli
Ericsson
April 8, 2015
Requirements for Abstraction and Control of Transport Networks
draft-lee-teas-actn-requirements-00.txt
Abstract
This draft provides a set of requirements for abstraction and
control of transport networks.
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Table of Contents
1. Introduction ....................................... 3
2. High-level ACTN requirements .......................... 3
3. ACTN Use-Cases ..................................... 7
3.1. Two categories of requirements .................... 10
4. Mapping of requirements into generalized scenarios ........ 13
4.1. Coordination of Multi-destination Service Requirement/Policy
............................................... 15
4.2. Application Service Policy-aware Network Operation .... 17
4.3. Dynamic Service Control Policy Enforcement for Performance
and Fault Management ............................... 18
4.4. E2E VN Survivability and Multi-Layer (Packet-Optical)
Coordination for Protection/Restoration ................. 19
5. ACTN interfaces requirements ......................... 20
5.1. CMI Interface Requirements ....................... 21
5.2. MPI (MDSC-PNC Interface) ........................ 23
6. References ....................................... 26
6.1. Informative References .......................... 26
7. Contributors ...................................... 27
Contributors' Addresses ............................... 27
Authors' Addresses ................................... 27
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1. Introduction
This draft provides a set of requirements for ACTN identified in
various use-cases of ACTN. [ACTN-frame] defines the base reference
architecture and terminology. [ACTN-PS] provides problem statement
and gap analysis.
Section 2 provides high-level ACTN requirements. Sections 3-5
provide the list of ACTN use-cases and the detailed requirement
analysis of these use-cases.
2. High-level ACTN requirements
1. Requirement 1: Single Virtualized Network Topology
Ability to build virtual network operation infrastructure based
on multi-layer, multi-domain topology abstracted from multiple
physical network controllers (e.g., GMPLS, OpenFlow, PCE, NMS,
etc.)
Reference: [KLEE], [LOPEZ], [DHODY], [CHENG].
2. Requirement 2: Policy Enforcement
Ability to provide service requirement/policy (Between Customer
and Network) and mechanism to enforce service level agreement.
- Endpoint selection policy, routing policy, time-related
policy, etc.
Reference: [KLEE], [LOPEZ], [SHIN], [DHODY], [FANG].
3. Requirement 3: VN Query
Ability to request/respond VN Query (Can you give me VN(s)?)
- Request Input:
- VN end-points (CE end)
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- VN Topology Service-specific Multi-Cost Objective
Function
- VN Topology diversity (e.g., VN1 and VN2 must be
disjoint)
- VN Topology type: path, graph
- Response includes VN topology
- Exact
- Potential
Reference: [KUMAKI], [FANG], [CHENG].
4. Requirement 4: VN Instantiate
Ability to request/confirm VN Instantiation
- VN instance ID
- VN end-points
- VN constraints requirement
- Latency only, B/W guarantee, Latency and B/W guarantee
together
- VN diversity
- Node/Link disjoint from other VNs
- VN level diversity (e.g., VN1 and VN2 must be disjoint)
- VN type
- Path (tunnel), Node/Links (graph)
- VN instance ID per service (unique id to identify VNs)
Reference: [KUMAKI], [FANG], [CHENG].
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5. Requirement 5: Dynamic VN Control
Dynamic/On-demand VN Modification/Confirmation with feedback loop
to the customer
- Traffic monitoring and control policies sent to the network
- Network states based traffic optimization policies
- Utilization Monitoring (Frequency of report)
- Abstraction of Resource Topology reflecting these service-
related parameters
Reference: [XU], [DHODY], [CHENG].
6. Requirement 6: VN Lifecycle M&O
VN lifecycle management/operation
- Instantiate
- Delete
- Modify
- Update (VN level OAM Monitoring) under policy agreement
Reference: [FANG], [KUMAKI], [LOPEZ].
7. Requirement 7: VN Service Operation
Ability to setup and manage end-2-end service on the VN involving
multi-domain, multi-layer, meeting constraints based on SLAs.
Reference: [LOPEZ], [KUMAKI], [CHENG], [DHODY], [FANG], [KLEE].
8. Requirement 8: Multi-destination Coordination
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Coordination of multi-destination service requirement/policy to
support dynamic applications such as VM migration, disaster
recovery, load balancing, etc.
- Service-policy primitives and its parameters
Reference: [FANG], [LOPEZ], [SHIN].
9. Requirement 9: Multi-domain & Multi-layer Coordination
Ability to Coordinate multi-domain and multi-layer path
computation and setup operation (network)
- Computes E2E path across multi-domain (based on abstract
topology from each domain)
- Determines the domain sequence
- Request path signaling to each domain controller
- Find alternative path if any of the domain controllers cannot
find its domain path
Reference: [CHENG], [DHODY], [KLEE], [LOPEZ], [SHIN].
10. Requirement 10: E2E Path Restoration
Ability to perform E2E Path Restoration Operation
- Intra-domain recovery
- Cross-domain recovery
Reference: [CHENG], [KLEE], [DHODY], [LOPEZ], [SHIN].
11. Requirement 11: Dynamicity of network control operations
The ACTN interfaces should support dynamicity nature of network
control operations. This includes but not limited to the
following:
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- Real-time VN control (e.g., a fast recovery/reroute upon
network failure).
- Fast convergence of abstracted topologies upon changes due
to failure or reconfiguration across the network domain
view, the multi-domain network view and the customer view.
- Large-scale VN operation (e.g., ability to query tens of
thousands of nodes and connectivity) for time-sensitive
applications.
Reference: [SHIN], [XU], [KUMAKI].
3. ACTN Use-Cases
Listed below is a set of high-level requirements identified by each
of the ACTN use-cases:
- [CHENG] (ACTN Use-cases for Packet Transport Networks in Mobile
Backhaul Networks)
o Faster End-to-End Enterprise Services Provisioning
o Multi-layer coordination in L2/L3 Packet Transport Networks
o Optimizing the network resources utilization (supporting
various performances monitoring matrix, such as traffic flow
statistics, packet delay, delay variation, throughput and
packet-loss rate)
o Virtual Networks Operations for multi-domain Packet Transport
Networks
- [DHODY] (Packet Optical Integration (POI) Use Cases for
Abstraction and Control of Transport Networks (ACTN))
o Packet Optical Integration to support Traffic Planning,
performance Monitoring, automated congestion management and
Automatic Network Adjustments
o Protection and Restoration Synergy in Packet Optical Multi-
layer network.
o Service Awareness and Coordination between Multiple Network
Domains
- [FANG] (ACTN Use Case for Multi-domain Data Center Interconnect)
o Multi-domain Data Center Interconnection to support VM
Migration, Global Load Balancing, Disaster Recovery, On-
demand Virtual Connection/Circuit Services
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o The interfaces between the Data Center Operation and each
transport network domain SHOULD support standards-based
abstraction with a common information/data model to support
the following:
. Network Query (Pull Model) from the Data Center
Operation to each transport network domain to collect
potential resource availability (e.g., BW availability,
latency range, etc.) between a few data center
locations.
. Network Path Computation Request from the Data Center
Operation to each transport network domain to estimate
the path availability.
. Network Virtual Connections/Circuits Request from the
Data Center Operation to each transport domain to
establish end-to-end virtual connections/circuits (with
type, concurrency, duration, SLA.QoS parameters,
protection.reroute policy options, policy constraints
such as peering preference, etc.).
. Network Virtual Connections/Circuits Modification
Request
- [KLEE] (ACTN Use-case for On-demand E2E Connectivity Services in
Multiple Vendor Domain Transport Networks)
o Two-stage path computation capability in a hierarchical
control architecture (MDSC-PNC) and a hierarchical
composition of integrated network views
o Coordination of signal flow for E2E connections.
o Abstraction of:
. Inter-connection data between domains
. Customer Endpoint data
. The multiple levels/granularities of the abstraction of
network resource (which is subject to policy and service
need).
. Any physical network constraints (such as SRLG, link
distance, etc.) should be reflected in abstraction.
. Domain preference and local policy (such as preferred
peering point(s), preferred route, etc.), Domain network
capability (e.g., support of push/pull model).
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- [KUMAKI] (ACTN : Use case for Multi Tenant VNO)
o On-demand Virtual Network Service Creation
o Domain Control Plane/Routing Layer Separation
o Independent service Operation for Virtual Services from
control of other domains
o Multiple service level support for each VN (e.g., bandwidth
and latency for each VN service).
o VN diversity/survivability should be met in physical network
mapping.
o VN confidentiality and sharing constraint should be supported.
- [LOPEZ] (ACTN Use-case for Virtual Network Operation for Multiple
Domains in a Single Operator Network)
o Creation of a global abstraction of network topology: The VNO
Coordinator assembles each domain level abstraction of
network topology into a global abstraction of the end-to-
endnetwork.
o End-to-end connection lifecycle management
o Invocation of path provisioning request to each domain
(including optimization requests)
o Invocation of path protection/reroute to the affected
domain(s)
o End-to-end network monitoring and fault management. This could
imply potential KPIs and alarm correlation capabilities.
o End-to-end accounting and generation of detailed records for
resource usage
o End-to-end policy enforcement
- [SHIN] (ACTN Use-case for Mobile Virtual Network Operation for
Multiple Domains in a Single Operator Network)
o Resource abstraction: operational mechanisms in mobile
backhaul network to give the current network usage
information for dynamic and elastic applications be
provisioned dynamically with QoS guarantee.
o Load balancing or for recovery, the selection of core DC
location from edge constitutes a data center selection
problem.
o Multi-layer routing and optimization, coordination between
these two layers.
- [XU] (Use Cases and Requirements of Dynamic Service Control based
on Performance Monitoring in ACTN Architecture)
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o Dynamic Service Control Policy enforcement and Traffic/SLA
Monitoring:
. Customer service performance monitoring strategy,
including the traffic monitoring object (the service
need to be monitored)
. monitoring parameters (e.g., transmitted and received
bytes per unit time),
. traffic monitoring cycle (e.g., 15 minutes, 24 hours),
. threshold of traffic monitoring (e.g., high and low
threshold), etc.
3.1. Two categories of requirements
This section provides a summary of use-cases in terms of two
categories: (i) service-specific requirements; (ii) network-related
requirements.
Service-specific requirements listed below are uniquely applied to
the work scope of ACTN. Service-specific requirements are related to
virtual service coordination function defined in Section 3. These
requirements are related to customer's VNs in terms of service
policy associated with VNs such as service performance objectives,
VN endpoint location information for certain required service-
specific functions (e.g., security and others), VN survivability
requirement, or dynamic service control policy, etc.
Network-related requirements are related to virtual network
operation function defined in Section 3. These requirements are
related to multi-domain and multi-layer signaling, routing,
protection/restoration and synergy, re-optimization/re-grooming,
etc. These requirements are not inherently unique for the scope of
ACTN but some of these requirements are in scope of ACTN, especially
for coherent/seamless operation aspect of multiple controller
hierarchy.
The following table gives an overview of service-specific
requirements and network-related requirements respectively for each
ACTN use-case and identifies the work in scope of ACTN.
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Use-case Service- Network-related ACTN Work
specific Requirements Scope
Requirements
------- -------------- --------------- --------------
[CHENG] - E2E service - Multi-layer - Dynamic
provisioning (L2/L2.5) multi-layer
- Performance coordination coordination
monitoring - VNO for multi- based on
- Resource domain transport utilization is
utilization networks in scope of
abstraction ACTN
- YANG for
utilization
abstraction
------- -------------- ---------------- --------------
[DHODY] - Service - POI - Performance
awareness/ Performance related data
coordination monitoring model may be
between P/O. - Protection/ in scope of
Restoration ACTN
synergy - Customer's
VN
survivability
policy
enforcement
for
protection/res
toration is
unique to
ACTN.
------- -------------- ---------------- --------------
[FANG] - Dynamic VM - On-demand - Multi-
migration virtual circuit destination
(service), request service
Global load - Network Path selection
balancing Connection policy
(utilization request enforcement
efficiency), and its
Disaster related
recovery primitives/inf
- Service- ormation are
aware network unique to
query ACTN.
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- Service - Service-
Policy aware network
Enforcement query and its
data model can
be extended by
ACTN.
------- -------------- ---------------- --------------
[KLEE] - Two stage path - Multi-domain
computation service policy
E2E signaling coordination
coordination to network
primitives is
- Abstraction of in scope of
inter-domain ACTN
info
- Enforcement of
network policy
(peering, domain
preference)
- Network
capability
exchange
(pull/push,
abstraction
level, etc.)
------- -------------- ---------------- --------------
[KUMAKI] - On-demand VN - All of the
creation service-
- Multi- specific lists
service level in the left
for VN column is
- VN unique to
survivability ACTN.
/diversity/con
fidentiality
------- -------------- ---------------- --------------
[LOPEZ] - E2E - E2E connection - Escalation
accounting and management, path of performance
resource usage provisioning and fault
data - E2E network management
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- E2E service monitoring and data to CNC
policy fault management and the policy
enforcement enforcement
for this area
is unique to
ACTN.
------- -------------- ---------------- --------------
[SHIN] - Current - LB for - Multi-layer
network recovery routing and
resource - Multi-layer optimization
abstraction routing and are related to
Endpoint/DC optimization VN's dynamic
dynamic coordination endpoint
selection (for selection
VM migration) policy.
------- -------------- ---------------- --------------
[XU] - Dynamic - Traffic - Dynamic
service monitoring service
control policy - SLA monitoring control policy
enforcement enforcement
- Dynamic and its
service control
control primitives are
in scope of
ACTN
- Data model
to support
traffic
monitoring
data is an
extension of
YANG model
ACTN can
extend.
4. Mapping of requirements into generalized scenarios
The subsequent sections provide the mapping of requirements into a
number of generalized scenarios.
- Coordination of Multi-destination Service Requirement/Policy
(Section 4.1)
- Application Service Policy-aware Network Operation (section 4.2)
- Dynamic Service Control Policy Enforcement for Performance/Fault
Management (Section 4.3)
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- E2E VN Survivability and Multi-Layer (Packet-Optical) Coordination
for Protection/Restoration (Section 2.4)
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4.1. Coordination of Multi-destination Service Requirement/Policy
+----------------+
| CNC |
| (Global DC |
| Operation |
| Control) |
+--------+-------+
| | Service Requirement/Policy:
| | - Endpoint/DC location info
| | - Endpoint/DC dynamic
| | selection policy
| | (for VM migration, DR, LB)
| v
+---------+--------+
| Multi-domain | Service policy-driven
|Service Controller| dynamic DC selection
+-----+---+---+----+
| | |
| | |
+----------------+ | +----------------+
| | |
+-----+-----+ +-----+------+ +------+-----+
| PNC for | | PNC for | | PNC for |
| Transport | | Transport | | Transport |
| Network A | | Network B | | network C |
+-----------+ +------------+ +------------+
| | |
+---+ ------ ------ ------ +---+
|DC1|--//// \\\\ //// \\\\ //// \\\\---+DC4|
+---+ | | | | | | +---+
| TN A +-----+ TN B +----+ TN C |
/ | | | | |
/ \\\\ //// / \\\\ //// \\\\ ////
+---+ ------ / ------ \ ------ \
|DC2| / \ \+---+
+---+ / \ |DC6|
+---+ \ +---+ +---+
|DC3| \|DC4|
+---+ +---+
DR: Disaster Recovery
LB: Load Balancing
Figure 1: Service Policy-driven Data Center Selection
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Figure 1 shows how VN service policies from the CNC are incorporated
by the MDSC to support multi-destination applications. Multi-
destination applications refer to applications in which the
selection of the destination of a network path for a given source
needs to be decided dynamically to support such applications.
Data Center selection problems arise for VM mobility, disaster
recovery and load balancing cases. VN's service policy plays an
important role for virtual network operation. Service policy can be
static or dynamic. Dynamic service policy for data center selection
may be placed as a result of utilization of data center resources
supporting VNs. The MSDC would then incorporate this information to
meet the service objective of this application.
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4.2. Application Service Policy-aware Network Operation
+----------------+
| CNC |
| (Global DC |
| Operation |
| Control) |
+--------+-------+
| | Application Service Policy
| | - VNF requirement (e.g.
| | security function, etc.)
| | - Location profile for each VNF
| v
+---------+--------+
| Multi-domain | Dynamically select the
|Service Controller| network destination to
+-----+---+---+----+ meet VNF requirement.
| | |
| | |
+---------------+ | +----------------+
| | |
+------+-----+ +-----+------+ +------+-----+
| PNC for | | PNC for | | PNC for |
| Transport | | Transport | | Transport |
| Network A | | Network B | | network C |
| | | | | |
+------------+ +------------+ +------------+
| | |
{VNF b} | | | {VNF b,c}
+---+ ------ ------ ------ +---+
|DC1|--//// \\\\ //// \\\\ //// \\\\-|DC4|
+---+ | | | | | |+---+
| TN A +---+ TN B +--+ TN C |
/ | | | | |
/ \\\\ //// / \\\\ //// \\\\ ////
+---+ ------ / ------ \ ------ \
|DC2| / \ \\+---+
+---+ / \ |DC6|
{VNF a} +---+ +---+ +---+
|DC3| |DC4| {VNF a,b,c}
+---+ +---+
{VNF a, b} {VNF a, c}
Figure 2: Application Service Policy-aware Network Operation
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This scenario is similar to the previous case in that the VN service
policy for the application can be met by a set of multiple
destinations that provide the required virtual network functions
(VNF). Virtual network functions can be, for example, security
functions required by the VN application. The VN service policy by
the CNC would indicate the locations of a certain VNF that can be
fulfilled. This policy information is critical in finding the
optimal network path subject to this constraint. As VNFs can be
dynamically moved across different DCs, this policy should be
dynamically enforced from the CNC to the MDSC and the PNCs.
4.3. Dynamic Service Control Policy Enforcement for Performance and
Fault Management
+------------------------------------------------+
| Customer Network Controller |
+------------------------------------------------+
1.Traffic| /|\4.Traffic | /|\
Monitor& | | Monitor | | 8.Traffic
Optimize | | Result 5.Service | | modify &
Policy | | modify& | | optimize
\|/ | optimize Req.\|/ | result
+------------------------------------------------+
| Mult-domain Service Controller |
+------------------------------------------------+
2. Path | /|\3.Traffic | |
Monitor | | Monitor | |7.Path
Request | | Result 6.Path | | modify &
| | modify& | | optimize
\|/ | optimize Req.\|/ | result
+------------------------------------------------+
| Physical Network Controller |
+------------------------------------------------+
Figure 3: Dynamic Service Control for Performance and Fault
Management
Figure 3 shows the flow of dynamic service control policy
enforcement for performance and fault management initiated by
customer per their VN. The feedback loop and filtering mechanism
tailored for VNs performed by the MDSC differentiates this ACTN
scope from traditional network management paradigm. VN level dynamic
OAM data model is a building block to support this capability.
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4.4. E2E VN Survivability and Multi-Layer (Packet-Optical) Coordination
for Protection/Restoration
+----------------+
| Customer |
| Network |
| Controller |
+--------*-------+
* | E2E VN Survivability Req.
* | - VN Protection/Restoration
* v - 1+1, Restoration, etc.
+----=-*----+ - End Point (EP) info.
| |
| MDSC | MDSC enforces VN survivability
| | requirement, determining the
| | optimal combination of Packet/
+---==-*-----+ Opticalprotection/restoration,
* Optical bypass, etc.
*
*
**********************************************
* * * *
+----*-----+ +----*----+ +----*-----+ +----*----+
|PNC for | |PNC for | |PNC for | |PNC for |
|Access N. | |Packet C.| |Optical C.| |Access N.|
+----*-----+ +----*----+ +----*-----+ +---*-----+
* --*--- * *
* /// \\\ * *
--*--- | Packet | * ----*-
/// \\\ | Core +------+------/// \\\
| Access +----\\ /// * | Access |
| Network | ---+-- * | Network | +---+
|\\\ /// | * \\\ ///---+EP6|
| +---+- | | -----* -+---+ +---+
+-+-+ | | +----/// \\\ | |
|EP1| | +--------------+ Optical | | | +---+
+---+ | | Core +------+ +--+EP5|
+-+-+ \\\ /// +---+
|EP2| ------ |
+---+ | |
+--++ ++--+
|EP3| |EP4|
+---+ +---+
Figure 4: E2E VN Survivability and Multi-layer Coordination for
Protection and Restoration
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Figure 4 shows the need for E2E protection/restoration control
coordination that involves CNC, MDSC and PNCs to meet the VN
survivability requirement. VN survivability requirement and its
policy need to be translated into multi-domain and multi-layer
network protection and restoration scenarios across different
controller types. After an E2E path is setup successfully, the MSDC
has a unique role to enforce policy-based flexible VN survivability
requirement by coordinating all PNC domains.
As seen in Figure 4, multi-layer (i.e., packet/optical) coordination
is a subset of this E2E protection/restoration control operation.
The MDSC has a role to play in determining an optimal
protection/restoration level based on the customer's VN
survivability requirement. For instance, the MDSC needs to interface
the PNC for packet core as well as the PNC for optical core and
enforce protection/restoration policy as part of the E2E
protection/restoration. Neither the PNC for packet core nor the PNC
for optical core is in a position to be aware of the E2E path and
its protection/restoration situation. This role of the MSDC is
unique for this reason. In some cases, the MDSC will have to
determine and enforce optical bypass to find a feasible reroute path
upon packet core network failure which cannot be resolved the packet
core network itself.
To coordinate this operation, the PNCs will need to update its
domain level abstract topology upon resource changes due to a
network failure or other factors. The MSDC will incorporate all
these update to determine if an alternate E2E reroute path is
necessary or not based on the changes reported from the PNCs. It
will need to update the E2E abstract topology and the affected CN's
VN topology in real-time. This refers to dynamic synchronization of
topology from Physical topology to abstract topology to VN topology.
MDSC will also need to perform the path restoration signaling to the
affected PNCs whenever necessary.
5. ACTN interfaces requirements
This section provides ACTN interface requirements for the two
interfaces that are within the ACTN scope.
. CMI: CNC-MDSC Interface (Section 5.1)
. MPI: MDSC-PNC Interface (Section 5.2)
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5.1. CMI Interface Requirements
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Requirement
1. Security/Policy Negotiation (Who are you?) (Between CNC and
MDSC)
- Configured vs. Discovered
- Trust domain verification (External Entity vs. Internal
Service Department)
- Push/Pull support (for policy)
2. VN Topology Query (Can you give me VN?) (From CNC to MDSC)
- VN end-points (CE end)
- VN Topology Service-specific Multi-Cost Objective Function
o Latency Map
o Available B/W Map
o Latency Map and Available B/W Map together
o Other types
- VN Topology diversity
o Node/Link disjoint from other VNs
o VN Topology level diversity (e.g., VN1 and VN2 must be
disjoint)
- VN Topology type
o Path vector (tunnel)
o Node/Links (graph)
3. VN Topology Query Response (From MDSC to CNC: Here's the VN
Topology that can be given to you if you accept)
- For VN Topology,
o This is what can be reserved for you
o This is what is available beyond what is given to you
(potential)
4. VN Topology Abstraction Model (generic network model)
5. VN Topology Abstraction Model (Service-specific model that
include customer endpoints)
6. Basic VN Instantiation Request/Confirmation (Between CNC and
MDSC: I need VN for my service, please instantiate my VN)
- VN instance ID
- VN end-points
- VN service requirement
o Latency only
o B/W guarantee
o Latency and B/W guarantee together
- VN diversity
o Node/Link disjoint from other VNs
- VN level diversity (e.g., VN1 and VN2 must be disjoint)
- VN type
o Path vector (tunnel)
o Node/Links (graph)
- VN instance ID per service (unique id to identify VNs)
- If failed to instantiate the requested VN, say why
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7. Dynamic/On-demand VN Instantiation/Modification and
Confirmation with feedback loop (This is to be differentiated
from Basic VN Instantiation)
- Performance/Fault Monitoring
- Utilization Monitoring (Frequency of report)
- Abstraction of Resource Topology reflecting these service-
related parameters
- Dynamic Policy enforcement
8. VN lifecycle management/operation
- Create (same as VN instantiate Request)
- Delete
- Modify
- Update (VN level OAM Monitoring) under policy agreement
9. Coordination of multi-destination service requirement/policy
to support dynamic applications such as VM migration,
disaster recovery, load balancing, etc.
- Service-policy primitives and its parameters
5.2. MPI (MDSC-PNC Interface)
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Requirement
1. Security/Policy negotiation (who are you?)
- Exchange of key, etc.
- Domain preference + local policy exchange
- Push/Pull support
- Preferred peering points
- Preferred route
- Reroute policy
- End-point mobility (for multi-destination)
2. Topology Query /Response (Pull Model from MDSC to PNC: Please
give me your domain topology)
- TED Abstraction level negotiation
- Abstract topology (per policy)
o Node/Link metrics
o Node/Link Type (Border/Gateway, etc.)
o All TE metrics (SRLG, etc.)
o Topology Metrics (latency, B/W available, etc.)
3. Topology Update (Push Model from PNC to MDSC)
- Under policy agreement, topology changes to be pushed to MDSC
from PNC
4. VN Path Computation Request (From MDSC to PNC: Please give me
a path in your domain)
- VN Instance ID (Note: this is passed from CNC to MDSC)
- End-point information
- CE ends
- Border points (if applicable)
- All other PCE request info (PCEP)
5. VN Path Computation Reply (here's the path info per your
request)
- Path level abstraction
- LSP DB
- LSP ID ??
- VN ID
6. Coordination of multi-domain Centralized Signaling (MSDC
operation) Path Setup Operation
- MSDC computes E2E path across multi-domain (based on abstract
topology from each PNC)
- MDSC determines the domain sequence
- MDSC request path signaling to each PNC (domain)
- MDSC finds alternative path if any of the PNCs cannot find its
domain path
o PNC will crankback to MDSC if it cannot find its domain
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path
o PNC will confirm to MDSC if it finds its domain path
7. Path Restoration Operation (after an E2E path is setup
successfully, some domain had a failure that cannot be
restored by the PNC domain)
- The problem PNC will send this notification with changed
abstract topology (computed after resource changes due to
failure/other factors)
- MDSC will find an alternate E2E path based on the changes
reported from PNC. It will need to update the E2E abstract
topology and the affected CN's VN topology in real-time (This
refers to dynamic synchronization of topology from Physical
topology to abstract topology to VN topology)
- MDSC will perform the path restoration signaling to the
affected PNCs.
8. Coordination of Multi-destination service restoration
operation (CNC have, for example, multiple endpoints where the
source endpoint can send its data to either one of the
endpoints)
- When PNC reports domain problem that cannot be resolved at
MDSC level because of there is no network restoration path to
a given destination.
- Then MDSC has Customers' profile in which to find the customer
has "multi-destination" application.
- Under policy A, MDSC will be allowed to reroute the customer
traffic to one of the pre-negotiated destinations and proceed
with restoration of this particular customer's traffic.
- Under policy B, CNC may reroute on its VN topology level and
push this to MDSC and MDSC maps this into its abstract
topology and proceed with restoration of this customer's
traffic.
- In either case, the MDSC will proceed its restoration
operation (as explained in Req. 6) to the corresponding PNCs.
9. MDSC-PNC policy negotiation is also needed as to how
restoration is done across MDSC and PNCs.
10. Generic Abstract Topology Update per changes due to new
path setup/connection failure/degradation/restoration
11. Service-specific Abstract Topology Update per changes due
to new path setup/connection failure/degradation/restoration
12. Abstraction model of technology-specific topology element
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6. References
6.1. Informative References
[ACTN-Frame] D. Ceccarelli, et al., "Framework for Abstraction and
Control of Transport Networks", draft-ceccarelli-actn-
framework, work in progress.
[ACTN-PS] Y. Lee, D. King, M. Boucadair, R. Jing, L. Contreras
Murillo, "Problem Statement for Abstraction and Control of
Transport Networks", draft-leeking-actn-problem-statement,
work in progress.
[CHENG] W. Cheng, et. al., "ACTN Use-cases for Packet Transport
Networks in Mobile Backhaul Networks", draft-cheng-actn-
ptn-requirements, work in progress.
[DHODY] D. Dhody, et. al., "Packet Optical Integration (POI) Use
Cases for Abstraction and Control of Transport Networks
(ACTN)", draft-dhody-actn-poi-use-case, work in progress.
[FANG] L. Fang, "ACTN Use Case for Multi-domain Data Center
Interconnect", draft-fang-actn-multidomain-dci, work in
progress.
[KLEE] K. Lee, H. Lee, R. Vilata, V. Lopez, "ACTN Use-case for On-
demand E2E Connectivity Services in Multiple Vendor Domain
Transport Networks", draft-klee-actn-connectivity-multi-
vendor-domains, work in progress.
[KUMAKI] K. Kumaki, T. Miyasaka, "ACTN : Use case for Multi Tenant
VNO ", draft-kumaki-actn-multitenant-vno, work in
progress.
[LOPEZ] D. Lopez (Ed), "ACTN Use-case for Virtual Network Operation
for Multiple Domains in a Single Operator Network", draft-
lopez-actn-vno-multidomains, work in progress.
[SHIN] J. Shin, R. Hwang, J. Lee, "ACTN Use-case for Mobile Virtual
Network Operation for Multiple Domains in a Single
Operator Network", draft-shin-actn-mvno-multi-domain, work
in progress.
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[XU] Y. Xu, et. al., "Use Cases and Requirements of Dynamic Service
Control based on Performance Monitoring in ACTN
Architecture", draft-xu-actn-perf-dynamic-service-control,
work in progress.
7. Contributors
Contributors' Addresses
Authors' Addresses
Young Lee
Huawei Technologies
5340 Legacy Drive
Plano, TX 75023, USA
Phone: (469)277-5838
Email: leeyoung@huawei.com
Dhruv Dhody
Huawei Technologies
Email: dhruv.ietf@gmail.com
Sergio Belotti
Alcatel Lucent
Via Trento, 30
Vimercate, Italy
Email: sergio.belotti@alcatel-lucent.com
Khuzema Pithewan
Infinera
Email: kpithewan@infinera.com
Daniele Ceccarelli
Ericsson
Torshamnsgatan,48
Stockholm, Sweden
Email: daniele.ceccarelli@ericsson.com
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