Internet DRAFT - draft-ietf-nvo3-gap-analysis
draft-ietf-nvo3-gap-analysis
Internet Engineering Task Force E. Gray, Ed.
Internet-Draft Ericsson
Intended status: Informational N. Bitar
Expires: August 18, 2014 Verizon
X. Chen
Huawei Technologies
M. Lasserre
Alcatel-Lucent
T. Tsou
Huawei Technologies (USA)
February 14, 2014
NVO3 Gap Analysis - Requirements Versus Available Technology Choices
draft-ietf-nvo3-gap-analysis-01
Abstract
This document evaluates candidate protocols against the NVO3
requirements. Gaps are identified and further work recommended.
Status of This Memo
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This Internet-Draft will expire on August 18, 2014.
Copyright Notice
Copyright (c) 2014 IETF Trust and the persons identified as the
document authors. All rights reserved.
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to this document. Code Components extracted from this document must
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology and Conventions . . . . . . . . . . . . . . . . . 3
2.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2.2. Conventions . . . . . . . . . . . . . . . . . . . . . . . 3
2.3. Terms and Abbreviations . . . . . . . . . . . . . . . . . 3
3. Operational Requirements . . . . . . . . . . . . . . . . . . 4
4. Management Requirements . . . . . . . . . . . . . . . . . . . 4
5. Control Plane Requirements . . . . . . . . . . . . . . . . . 4
5.1. NVE-NVA Control-Plane Requirements . . . . . . . . . . . 6
5.2. VM-to-NVE Specific Control-Plane Requirements . . . . . . 9
6. Data Plane Requirements . . . . . . . . . . . . . . . . . . . 11
7. Summary and Conclusions . . . . . . . . . . . . . . . . . . . 17
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 17
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18
10. Security Considerations . . . . . . . . . . . . . . . . . . . 18
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 18
11.1. Normative References . . . . . . . . . . . . . . . . . . 18
11.2. Informative References . . . . . . . . . . . . . . . . . 20
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 20
1. Introduction
The initial charter of the NVO3 Working Group requires it to identify
any gaps between the requirements identified and available
technoloogy solutions as a prerequisite to rechartering or concluding
the Working Group (if no gaps exist). This document is intended to
provide the required gap analysis.
This document provides a tabulation of candidate solutions and their
ability to satisfy each requirement identified by the Working Group.
Areas of work are identified where further work is required to ensure
that the requirements are met.
The major areas covered in this document include:
o Operational Requirements
[I-D.ashwood-nvo3-operational-requirement]
o Management Requirements (TBD)
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o Control (Plane) Requirements [I-D.ietf-nvo3-nve-nva-cp-req]
o Dataplane Requirements [I-D.ietf-nvo3-dataplane-requirements]
Since the Working Group has yet to complete (and in some cases adopt)
documents describing requirements for some of these areas, not all
areas are complete in the present version of this document.
The initial candidate technologies are:
o NVGRE [I-D.sridharan-virtualization-nvgre],
o VxLAN [I-D.mahalingam-dutt-dcops-vxlan],
o L2VPN: VPLS [RFC4761][RFC4762] and EVPN [I-D.ietf-l2vpn-evpn], and
o L3VPN [RFC4365].
2. Terminology and Conventions
2.1. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
2.2. Conventions
In sections providing analysis of requirements defined in referenced
documents, section numbers from each referenced document are used as
they were listed in that document.
In order to avoid confusing those section numbers with the section
numbering in this document, the included numbering is parenthesized.
L2VPN is represented (in tables and analysis, as a technology) by the
two differing approaches: VPLS and EVPN.
2.3. Terms and Abbreviations
This document uses terms and acronyms defined in [RFC3168],
[I-D.ietf-nvo3-framework], [I-D.ietf-nvo3-dataplane-requirements],
[I-D.kreeger-nvo3-hypervisor-nve-cp] and
[I-D.ietf-nvo3-nve-nva-cp-req]. Acronyms are included here for
convenience but are meant to remain aligned with definitions in the
references included.
ECN: Explicit Congestion Notification [RFC3168]
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NVA: Network Virtualization Authority [I-D.ietf-nvo3-nve-nva-cp-req]
NVE: Network Virtualization Edge [I-D.ietf-nvo3-framework]
VAP: Virtual Access Point [I-D.ietf-nvo3-dataplane-requirements]
VNI: Virtual Network Instance [I-D.ietf-nvo3-framework]
VNIC: Virtual Network Interface Card (NIC)
[I-D.kreeger-nvo3-hypervisor-nve-cp]
VNID: Virtual Network Identifier [I-D.ietf-nvo3-nve-nva-cp-req]
This document uses the following additional general terms and
abbreviations:
DSCP: Differentiated Services Code-Point
ECMP: Equal Cost Multi-Path
L2VPN: Layer 2 Virtual Private Network
L3VPN: Layer 3 Virtual Private Network
NVO3: Network Virtualization Overlay over L3
VM: Virtual Machine
VN: Virtual Network
3. Operational Requirements
TBD
4. Management Requirements
TBD
5. Control Plane Requirements
The NVO3 Problem Statement [I-D.ietf-nvo3-overlay-problem-statement],
describes 3 categories of control functions:
1. Control functions associated with implementing the Network
Virtualization Authority (e.g. - signaling and control required
for interactions between multiple NVA devices).
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2. Control functions associated with interactions between an NVA and
a Network Virtualization Edge (NVE).
3. Control functions associated with attaching and detaching a
Virtual Machine (VM) from a particular Virtual Network Instance
(VNI).
As sometimes happens, there is not a 1:1 mapping of the work areas
defined in [I-D.ietf-nvo3-overlay-problem-statement] and requirements
documents intended to address the problems that have been identified
there.
Current control-plane requirement documents include the following:
o NVE-NVA control-plane requirements [I-D.ietf-nvo3-nve-nva-cp-req]
o Control-plane requirements specific to VM-to-NVE interactions
[I-D.kreeger-nvo3-hypervisor-nve-cp]
In the following subsections, we consider the data-plane candidate
solutions and proposed or existing control plane solutions that may
apply to each.
In each case, the control-plane solutions can be divided into support
for Layer-2 and Layer-3 services, and for each of these cases, the
data-plane solutions considered will be limited to those services and
solutions that make sense for that case.
Tables are thus organized into separate tables for both L2 and L3
data/control service options. It may turn out that - for all
potential control-plane solutions - each solution applies equally to
all data-plane solutions considered for the layer applicable.
If this turns out to be the case, then the tables may be further
simplified - possibly by reducing each pair of L2/L3 tables to a
single table where the columns are simply "Layer-2" and "Layer-3."
The intent is to show potential mapping of data-plane to applicable
control-plane alternatives and evaluate each applicable control-plane
against defined control-plane requirements.
The way this document attempts to do this is to list the control
planes that may be applicable to each of the candidate data-planes in
table footnotes and then stating in table footnotes the extent to
which candidate control plane technologies satisfy each requirement.
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As with tables in other sections of this draft, the rows in each
table list the applicable requirements found in analogous sections of
applicable requirements documents.
5.1. NVE-NVA Control-Plane Requirements
In this section, numbering of requirement headings corresponds to
section numbering in [I-D.ietf-nvo3-nve-nva-cp-req].
(3.1) Inner to Outer Address Mapping
The requirements document [I-D.ietf-nvo3-nve-nva-cp-req] states that
avoiding the need to "flood" traffic to support learning of mapping
information from the data-plane is a goal of NVO3 candidate
technological approaches.
For each candidate technology, (how) is the mapping of header
information present in tenant traffic mapped to corresponding header
information to be used in overlay encapsulation (this includes
addresses, context identification, etc.) determined?
+---------------------------------------+-------+-------+-------+
| Supported Approach | VxLAN | VPLS | EVPN |
+---------------------------------------+-------+-------+-------+
| Control Protocol Mapping Acquisition? | | | |
| - - - | - - - | - - - | - - |
| Data-Plane Learning? | | | |
+---------------------------------------+-------+-------+-------+
Table 1: Inner:Outer Address Mapping (L2)
+---------------------------------------+-------+-------+
| Supported Approach | NVGRE | L3VPN |
+---------------------------------------+-------+-------+
| Control Protocol Mapping Acquisition? | | |
| - - - | - - - | - - - |
| Data-Plane Learning? | | |
+---------------------------------------+-------+-------+
Table 2: Inner:Outer Address Mapping (L3)
(3.2) Underlying Network Multi-Destination Address(es)
The requirements document [I-D.ietf-nvo3-nve-nva-cp-req] lists 3
approaches that may be used to deliver traffic to multiple
destinations in an overlay virtual network:
1. Use the capabilities of the underlay network.
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2. Require a sending NVE to replicate traffic.
3. Use a replication service provided within the overlay network.
For each delivery approach, it may be necessary to map specific
multipoint (e.g. - broadcast, unknown destination or multicast)
traffic to (for instance) addresses used to deliver this traffic via
the underlay network.
For each technological approach, which delivery approaches are
supported and does the technology provide a method by which an NVE
needing to send multi-destination traffic can determine to what
address, or addresses to which to send this traffic?
+------------------------------------+-------+-------+-------+
| Supported Approach | VxLAN | VPLS | EVPN |
+------------------------------------+-------+-------+-------+
| Underlay Network Capability | | | |
| - - - | - - - | - - - | - - - |
| NVE Sender Replication | | | |
| - - - | - - - | - - - | - - - |
| Replication Service | | | |
+------------------------------------+-------+-------+-------+
Table 3: Multi-Destination Delivery (L2)
+--------------------------------------+-------+-------+
| Supported Approach | NVGRE | L3VPN |
+--------------------------------------+-------+-------+
| Underlay Network Capability | | |
| - - - | - - - | - - - |
| NVE Sender Replication | | |
| - - - | - - - | - - - |
| Replication Service | | |
+--------------------------------------+-------+-------+
Table 4: Multi-Destination Delivery (L3)
(3.3) VN Connect/Disconnect Notification
The requirements document [I-D.ietf-nvo3-nve-nva-cp-req] states as an
assumption that a mechanism exists in the overlay technology by which
an NVE is notified of Tenant Systems attaching and detaching from a
specific Virtual Network (VN).
For each candidate technology, does the technology currently support
these functions?
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+------------------------------------+-------+-------+-------+
| Requirement | VxLAN | VPLS | EVPN |
+------------------------------------+-------+-------+-------+
| Connect Notification | | | |
| - - - | - - - | - - - | - - - |
| Disconnect Notification | | | |
+------------------------------------+-------+-------+-------+
Table 5: Connect/Disconnect Notification (L2)
+--------------------------------------+-------+-------+
| Requirement | NVGRE | L3VPN |
+--------------------------------------+-------+-------+
| Connect Notification | | |
| - - - | - - - | - - - |
| Disconnect Notification | | |
+--------------------------------------+-------+-------+
Table 6: Connect/Disconnect Notification (L3)
(3.4) VN Name to VNID Mapping
The requirements document [I-D.ietf-nvo3-nve-nva-cp-req] concludes
that having a means to map for a "VN Name to a "VN ID" may be useful.
For each technological approach we are considering, is this function
currently available?
+------------------------------------+-------+-------+-------+
| Function | VxLAN | VPLS | EVPN |
+------------------------------------+-------+-------+-------+
| VN-Name:VN-ID Mapping | | | |
+------------------------------------+-------+-------+-------+
Table 7: VN Name to VN ID Mapping (L2)
+--------------------------------------+-------+-------+
| Function | NVGRE | L3VPN |
+--------------------------------------+-------+-------+
| VN-Name:VN-ID Mapping | | |
+--------------------------------------+-------+-------+
Table 8: VN Name to VN ID Mapping (L3)
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5.2. VM-to-NVE Specific Control-Plane Requirements
In this section, numbering of requirement headings corresponds to
section numbering in [I-D.kreeger-nvo3-hypervisor-nve-cp].
(4.1) VN Connect/Disconnect
The requirements document [I-D.kreeger-nvo3-hypervisor-nve-cp] states
as a requirement that a mechanism must exist by which an NVE is
notified when an end device requires a connection, or no longer
requires a connection, to a specific Virtual Network (VN).
The requirements document further states as a requirement that the
mechanism(s) used in a candidate technological approach must provide
a local indicator (e.g. - 802.1Q tag) that the end device will use in
sending traffic to, or receiving traffic from, the NVE (where that
traffic is associated with the connected VN).
As an additional related requirement, the requirements document
states that the NVE - once notified of a connection to a VN (by VN
Name), needs to have a means for getting associated VN context
information from the NVA.
For each candidate technology, does the technology currently support
these functions?
+------------------------------------+-------+-------+-------+
| Requirement | VxLAN | VPLS | EVPN |
+------------------------------------+-------+-------+-------+
| Connect Notification | | | |
| - - - | - - - | - - - | - - - |
| Local VN Indicator | | | |
| - - - | - - - | - - - | - - - |
| VN Name to VN Context Mapping | | | |
| - - - | - - - | - - - | - - - |
| Disconnect Notification | | | |
+------------------------------------+-------+-------+-------+
Table 9: VN Connect/Disconnect (L2)
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+--------------------------------------+-------+-------+
| Requirement | NVGRE | L3VPN |
+--------------------------------------+-------+-------+
| Connect Notification | | |
| - - - | - - - | - - - |
| Local VN Indicator | | |
| - - - | - - - | - - - |
| VN Name to VN Context Mapping | | |
| - - - | - - - | - - - |
| Disconnect Notification | | |
+--------------------------------------+-------+-------+
Table 10: VN Connect/Disconnect (L3)
(4.2) VNIC Address Association
The requirements document [I-D.kreeger-nvo3-hypervisor-nve-cp] lists
two approaches for acquiring VNIC address association information:
1. Data Plane Learning (i.e. - by inspecting source addresses in
traffic received from an end device).
2. Explicit signaling from the end device when a specific VNIC
address is to be associated with a tenant system.
+------------------------------------+-------+-------+-------+
| Supported Approaches | VxLAN | VPLS | EVPN |
+------------------------------------+-------+-------+-------+
| Data Plane Learning | | | |
| - - - | - - - | - - - | - - - |
| Explicit Signaling | | | |
+------------------------------------+-------+-------+-------+
Table 11: VNIC Address Association (L2)
+--------------------------------------+-------+-------+
| Supported Approaches | NVGRE | L3VPN |
+--------------------------------------+-------+-------+
| Data Plane Learning | | |
| - - - | - - - | - - - |
| Explicit Signaling | | |
+--------------------------------------+-------+-------+
Table 12: VNIC Address Association (L3)
(4.3) VNIC Address Disassociation
TBD
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(4.4) VNIC Shutdown/Startup/Migration
TBD
(4.5) VN Profile
TBD
6. Data Plane Requirements
In this section, numbering of requirement headings corresponds to
section numbering in [I-D.ietf-nvo3-dataplane-requirements].
(3.1) Virtual Access Points (VAPs)
+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| MUST support VAP | | | | | |
| identification | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| 1) Local interface | YES | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| 2) Local interface + fields | YES | | | | |
| in frame header | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 13: VAP Identification Requirements
(3.2) Virtual Network Instance (VNI)
Network virtualization can be provided by L2 and/or L3 VNIs.
(3.2.1) L2 VNI
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+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| L2 VNI MUST provide an | | | | | |
| emulated Ethernet | | | | | |
| multipoint service as if | | | | | |
| Tenant Systems are | | | | | |
| interconnected by a bridge | | | | | |
| (but instead by using a set | | | | | |
| of NVO3 tunnels). | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| Loop avoidance capability | | | | | |
| MUST be provided. | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| Data plane learning MUST be | | | | | |
| supported as the default | | | | | |
| means to populate | | | | | |
| forwarding tables. | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| When flooding is required | | | | | |
| for delivery of broadcast, | | | | | |
| unknown unicast or | | | | | |
| multicast (BUM) traffic, | | | | | |
| the NVE MUST either support | | | | | |
| ingress replication or | | | | | |
| multicast. | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| If using multicast, the NVE | | | | | |
| MUST be able to build at | | | | | |
| least one default flooding | | | | | |
| tree for use by local VNIs | | | | | |
| for flooding to NVEs | | | | | |
| belonging to the same VN. | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 14: L2 VNI Service
(3.2.2) L3 VNI
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+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| L3 VNIs MUST provide | | | | | |
| virtualized IP routing and | | | | | |
| forwarding. | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| L3 VNIs MUST support per- | | | | | |
| tenant forwarding instance | | | | | |
| with IP addressing | | | | | |
| isolation and L3 tunneling | | | | | |
| for interconnecting | | | | | |
| instances of the same VNI | | | | | |
| on NVEs. | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| For L3 VNI, the inner TTL | | | | | |
| field MUST be decremented | | | | | |
| by at least 1 (as if the | | | | | |
| NVO3 egress was at least 1 | | | | | |
| hop away). | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| TTL in the outer IP header | | | | | |
| MUST be set to a value | | | | | |
| appropriate for delivery of | | | | | |
| the encapsulated packet to | | | | | |
| the tunnel exit point. | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| The default behavior for | | | | | |
| TTL MUST use the "pipe" | | | | | |
| model. | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 15: L3 VNI Service
(3.3.1) NVO3 overlay header
+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| An NVO3 overlay header MUST | YES | YES | YES | YES | YES |
| be included after the | | | | | |
| underlay tunnel header when | | | | | |
| forwarding tenant traffic. | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 16: Overlay Header
(3.3.1.1) Virtual Network Context Identification
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+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| The overlay encapsulation | YES | YES | YES | YES | YES |
| header MUST contain a field | | | | | |
| which allows the | | | | | |
| encapsulated frame to be | | | | | |
| delivered to the | | | | | |
| appropriate virtual network | | | | | |
| endpoint by the egress NVE. | | | | | |
| . | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| If Global Identifiers are | | | | | |
| used, the identifier field | | | | | |
| MUST be large enough to | | | | | |
| scale to hundreds of | | | | | |
| thousands of VNs. | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 17: Virtual Network Context Identification
(3.3.2.1) LAG and ECMP
+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| In order to perform fine- | | | | | |
| grained load-balancing, the | | | | | |
| data-plane encapsulation | | | | | |
| MUST result in sufficient | | | | | |
| entropy to exercise all | | | | | |
| paths through several | | | | | |
| LAG/ECMP hops. | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| All packets belonging to | NO | | | | |
| any specific flow MUST | | | | | |
| follow the same path in | | | | | |
| order to prevent packet re- | | | | | |
| ordering. | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 18: Multipath Support
(3.3.2.2) DiffServ and ECN marking
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+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| [RFC2983] defines two modes | NO | | | | |
| for mapping the DSCP | | | | | |
| markings from inner to | | | | | |
| outer headers and vice | | | | | |
| versa. Both models SHOULD | | | | | |
| be supported. | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 19: DSCP and ECN Marking
(3.3.2.3) Handling of broadcast, unknown unicast, and multicast
traffic
NVO3 data plane support for either ingress replication or point-to-
multipoint tunnels is required to send traffic destined to multiple
locations on a per-VNI basis (e.g. L2/L3 multicast traffic, L2
broadcast and unknown unicast traffic). It is possible that both
methods be used simultaneously.
+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| User-configurable knobs | | | | | |
| MUST be provided to select | | | | | |
| which method(s) are used | | | | | |
| based upon the amount of | | | | | |
| replication required. | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| When ingress replication is | | | | | |
| used, NVEs MUST track | | | | | |
| maintain (for each VNI) the | | | | | |
| related tunnel endpoints to | | | | | |
| which it needs to replicate | | | | | |
| the frame. | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 20: Handling of Broadcast, Unknown Unicast, and Multicast
Traffic
(3.4) External NVO3 connectivity
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+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| NVO3 services MUST | YES | | | | |
| interoperate with current | | | | | |
| VPN and Internet services. | | | | | |
| This may happen inside one | | | | | |
| DC during a migration phase | | | | | |
| or as NVO3 services are | | | | | |
| delivered to the outside | | | | | |
| world via Internet or VPN | | | | | |
| gateways. | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| Redundancy between NVO3 and | | | | | |
| external domains MUST be | | | | | |
| supported. | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 21: Interoperation
(3.4.2.1) Load-balancing
When using active-active load-balancing across physically separate
NVE GW's (e.g.: two, separate chassis) an NVO3 solution SHOULD
support forwarding tables that can simultaneously map a single egress
NVE to more than one NVO3 tunnels.
+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| The granularity of such | | | | | |
| mappings, in both active- | | | | | |
| backup and active-active, | | | | | |
| MUST be specific to each | | | | | |
| tenant. | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 22: Gateway Load-balancing
(3.5) Path MTU
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+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| Classical ICMP-based MTU | NO | | | | |
| Path Discovery ([RFC1191], | | | | | |
| [RFC1981]) or Extended MTU | | | | | |
| Path Discovery techniques | | | | | |
| such as defined in | | | | | |
| [RFC4821]. | | | | | |
| - - - | - - - | - - - | - - | - - | - - - |
| Fragmentation and | YES | | | | |
| reassembly support from the | | | | | |
| overlay layer operations | | | | | |
| without relying on the | | | | | |
| Tenant Systems to know | | | | | |
| about the end-to-end MTU. | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 23: Path MTU
(3.7) NVE Multi-Homing Requirements
+-----------------------------+-------+-------+------+------+-------+
| Requirement | NVGRE | VxLAN | VPLS | EVPN | L3VPN |
+-----------------------------+-------+-------+------+------+-------+
| Multi-homing techniques | NO | | | | |
| SHOULD be used to increase | | | | | |
| the reliability of an NVO3 | | | | | |
| network. | | | | | |
+-----------------------------+-------+-------+------+------+-------+
Table 24: Multihoming
7. Summary and Conclusions
TBD
8. Acknowledgements
The Authors would like to acknowledge the technical contributions of
Florin Balus, Luyuan Fang, Sue Hares, Wim Henderickx, Yves Hertoghs,
Yuichi Ikejiri, Rangaraju Iyengar, Mircea Pisica, Evelyn Roch, Ali
Sajassi, Peter Ashwood-Smith and Lucy Yong as well as the initial
help in editing the XML source for the document from Tom Taylor.
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9. IANA Considerations
This memo includes no request to IANA.
10. Security Considerations
Security considerations of the requirements documents referenced by
this analysis document apply.
11. References
11.1. Normative References
[I-D.ashwood-nvo3-operational-requirement]
Ashwood-Smith, P., Iyengar, R., Tsou, T., Sajassi, A.,
Boucadair, M., Jacquenet, C., and M. Daikoku, "NVO3
Operational Requirements", draft-ashwood-nvo3-operational-
requirement-03 (work in progress), July 2013.
[I-D.hertoghs-nvo3-lisp-controlplane-unified]
Hertoghs, Y., Maino, F., Moreno, V., Smith, M., Farinacci,
D., and L. Iannone, "A Unified LISP Mapping Database for
L2 and L3 Network Virtualization Overlays", draft-
hertoghs-nvo3-lisp-controlplane-unified-01 (work in
progress), February 2014.
[I-D.ietf-l2vpn-evpn]
Sajassi, A., Aggarwal, R., Henderickx, W., Isaac, A., and
J. Uttaro, "BGP MPLS Based Ethernet VPN", draft-ietf-
l2vpn-evpn-05 (work in progress), February 2014.
[I-D.ietf-nvo3-dataplane-requirements]
Bitar, N., Lasserre, M., Balus, F., Morin, T., Jin, L.,
and B. Khasnabish, "NVO3 Data Plane Requirements", draft-
ietf-nvo3-dataplane-requirements-02 (work in progress),
November 2013.
[I-D.ietf-nvo3-framework]
Lasserre, M., Balus, F., Morin, T., Bitar, N., and Y.
Rekhter, "Framework for DC Network Virtualization", draft-
ietf-nvo3-framework-05 (work in progress), January 2014.
[I-D.ietf-nvo3-nve-nva-cp-req]
Kreeger, L., Dutt, D., Narten, T., and D. Black, "Network
Virtualization NVE to NVA Control Protocol Requirements",
draft-ietf-nvo3-nve-nva-cp-req-01 (work in progress),
October 2013.
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[I-D.ietf-nvo3-overlay-problem-statement]
Narten, T., Gray, E., Black, D., Fang, L., Kreeger, L.,
and M. Napierala, "Problem Statement: Overlays for Network
Virtualization", draft-ietf-nvo3-overlay-problem-
statement-04 (work in progress), July 2013.
[I-D.kreeger-nvo3-hypervisor-nve-cp]
Kreeger, L., Narten, T., and D. Black, "Network
Virtualization Hypervisor-to-NVE Overlay Control Protocol
Requirements", draft-kreeger-nvo3-hypervisor-nve-cp-01
(work in progress), February 2013.
[I-D.mahalingam-dutt-dcops-vxlan]
Mahalingam, M., Dutt, D., Duda, K., Agarwal, P., Kreeger,
L., Sridhar, T., Bursell, M., and C. Wright, "VXLAN: A
Framework for Overlaying Virtualized Layer 2 Networks over
Layer 3 Networks", draft-mahalingam-dutt-dcops-vxlan-08
(work in progress), February 2014.
[I-D.sridharan-virtualization-nvgre]
Sridharan, M., Greenberg, A., Wang, Y., Garg, P.,
Venkataramiah, N., Duda, K., Ganga, I., Lin, G., Pearson,
M., Thaler, P., and C. Tumuluri, "NVGRE: Network
Virtualization using Generic Routing Encapsulation",
draft-sridharan-virtualization-nvgre-04 (work in
progress), February 2014.
[RFC1191] Mogul, J. and S. Deering, "Path MTU discovery", RFC 1191,
November 1990.
[RFC1981] McCann, J., Deering, S., and J. Mogul, "Path MTU Discovery
for IP version 6", RFC 1981, August 1996.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2983] Black, D., "Differentiated Services and Tunnels", RFC
2983, October 2000.
[RFC4365] Rosen, E., "Applicability Statement for BGP/MPLS IP
Virtual Private Networks (VPNs)", RFC 4365, February 2006.
[RFC4761] Kompella, K. and Y. Rekhter, "Virtual Private LAN Service
(VPLS) Using BGP for Auto-Discovery and Signaling", RFC
4761, January 2007.
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[RFC4762] Lasserre, M. and V. Kompella, "Virtual Private LAN Service
(VPLS) Using Label Distribution Protocol (LDP) Signaling",
RFC 4762, January 2007.
[RFC4821] Mathis, M. and J. Heffner, "Packetization Layer Path MTU
Discovery", RFC 4821, March 2007.
[RFC6040] Briscoe, B., "Tunnelling of Explicit Congestion
Notification", RFC 6040, November 2010.
11.2. Informative References
[RFC3168] Ramakrishnan, K., Floyd, S., and D. Black, "The Addition
of Explicit Congestion Notification (ECN) to IP", RFC
3168, September 2001.
Authors' Addresses
Eric Gray (editor)
Ericsson
120 Morris Avenue
Pitman, New Jersey 08071
USA
Email: eric.gray@ericsson.com
Nabil Bitar
Verizon
40 Sylvan Road
Waltham, Massachusetts 02145
USA
Email: nabil.bitar@verizon.com
Xiaoming Chen
Huawei Technologies
Email: ming.chen@huawei.com
Marc Lasserre
Alcatel-Lucent
Email: marc.lasserre@alcatel-lucent.com
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Tina Tsou
Huawei Technologies (USA)
2330 Central Expressway
Santa Clara, California 95050
USA
Phone: +1 408 330 4424
Email: Tina.Tsou.Zouting@huawei.com
URI: http://tinatsou.weebly.com/contact.html
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