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draft-ananthakrishnan-pce-stateful-path-protection-04.txt
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PCE Working Group H. Ananthakrishnan
Internet-Draft Packet Design
Intended status: Standards Track S. Sivabalan
Expires: March 30, 2018 Cisco
C. Barth
R. Torvi
Juniper Networks
I. Minei
Google, Inc
E. Crabbe
Individual Contributor
D. Dhody
Huawei Technologies
September 26, 2017
PCEP Extensions for MPSL-TE LSP Path Protection with stateful PCE
draft-ananthakrishnan-pce-stateful-path-protection-04
Abstract
A stateful Path Computation Element (PCE) is capable of computing as
well as controlling via Path Computation Element Protocol (PCEP)
Multiprotocol Label Switching Traffic Engineering Label Switched
Paths (MPLS LSP). Furthermore, it is also possible for a stateful
PCE to create, maintain, and delete LSPs. This document describes
PCEP extension to associate two or more LSPs to provide end-to-end
path protection.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 30, 2018.
Ananthakrishnan, et al. Expires March 30, 2018 [Page 1]
Internet-Draft Stateful PCE LSP Path Protection September 2017
Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. PCEP Extensions . . . . . . . . . . . . . . . . . . . . . . . 4
3.1. Path Protection Association Type . . . . . . . . . . . . 5
3.2. Path Protection Association TLV . . . . . . . . . . . . . 6
4. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. PCC Initiated LSPs . . . . . . . . . . . . . . . . . . . 7
4.2. PCE Initiated LSPs . . . . . . . . . . . . . . . . . . . 7
4.3. State Synchronization . . . . . . . . . . . . . . . . . . 8
4.4. Session Termination . . . . . . . . . . . . . . . . . . . 8
4.5. Error Handling . . . . . . . . . . . . . . . . . . . . . 8
5. Other considerations . . . . . . . . . . . . . . . . . . . . 8
6. IANA considerations . . . . . . . . . . . . . . . . . . . . . 9
6.1. Association Type . . . . . . . . . . . . . . . . . . . . 9
6.2. PPAG TLV . . . . . . . . . . . . . . . . . . . . . . . . 9
6.3. PCEP Errors . . . . . . . . . . . . . . . . . . . . . . . 10
7. Security Considerations . . . . . . . . . . . . . . . . . . . 10
8. Manageability Considerations . . . . . . . . . . . . . . . . 11
8.1. Control of Function and Policy . . . . . . . . . . . . . 11
8.2. Information and Data Models . . . . . . . . . . . . . . . 11
8.3. Liveness Detection and Monitoring . . . . . . . . . . . . 11
8.4. Verify Correct Operations . . . . . . . . . . . . . . . . 11
8.5. Requirements On Other Protocols . . . . . . . . . . . . . 11
8.6. Impact On Network Operations . . . . . . . . . . . . . . 11
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 11
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
10.1. Normative References . . . . . . . . . . . . . . . . . . 12
10.2. Information References . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
Ananthakrishnan, et al. Expires March 30, 2018 [Page 2]
Internet-Draft Stateful PCE LSP Path Protection September 2017
1. Introduction
[RFC5440] describes PCEP for communication between a Path Computation
Client (PCC) and a PCE or between one a pair of PCEs as per
[RFC4655]. A PCE computes paths for MPLS-TE LSPs based on various
constraints and optimization criteria.
Stateful pce [RFC8231] specifies a set of extensions to PCEP to
enable stateful control of paths such as MPLS TE LSPs between and
across PCEP sessions in compliance with [RFC4657]. It includes
mechanisms to effect LSP state synchronization between PCCs and PCEs,
delegation of control of LSPs to PCEs, and PCE control of timing and
sequence of path computations within and across PCEP sessions and
focuses on a model where LSPs are configured on the PCC and control
over them is delegated to the PCE. Furthermore, a mechanism to
dynamically instantiate LSPs on a PCC based on the requests from a
stateful PCE or a controller using stateful PCE, is specified in
[I-D.ietf-pce-pce-initiated-lsp].
Path protection refers to a paradigm in which the working LSP is
protected by one or more protection LSP(s). When the working LSP
fails, protection LSP(s) is/are activated. When the working LSPs are
computed and controlled by the PCE, there is benefit in a mode of
operation where protection LSPs are as well.
This document specifies a stateful PCEP extension to associate two or
more LSPs for the purpose of setting up path protection. The
proposed extension covers the following scenarios:
o A PCC initiates a protection LSP and retains the control of the
LSP. The PCC computes the path itself or makes a request for path
computation to a PCE. After the path setup, it reports the
information and state of the path to the PCE. This is the passive
stateful mode [RFC8051].
o A PCC initiates a protection LSP and delegates the control of the
LSP to a stateful PCE. The PCE may compute the path for the LSP
and update the PCC with the information about the path as long as
it controls the LSP. This is the active stateful mode [RFC8051].
o A protection LSP could be initiated by a stateful PCE, which
retains the control of the LSP. The PCE is responsible for
computing the path of the LSP and updating to the PCC with the
information about the path. This is the PCE Initiated mode
[I-D.ietf-pce-pce-initiated-lsp].
Note that protection LSP can be established prior to the failure (in
which case the LSP is said to me in standby mode) or post failure of
Ananthakrishnan, et al. Expires March 30, 2018 [Page 3]
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the corresponding working LSP according to the operator choice/
policy.
[I-D.ietf-pce-association-group] introduces a generic mechanism to
create a grouping of LSPs which can then be used to define
associations between a set of LSPs that is equally applicable to
stateful PCE (active and passive modes) and stateless PCE.
This document specifies a PCEP extension to associate one working LSP
with one or more protection LSPs using the generic association
mechanism.
This document describes a PCEP extension to associate protection LSPs
by creating Path Protection Association Group (PPAG) and encoding
this association in PCEP messages for stateful PCEP sessions.
1.1. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
2. Terminology
The following terminologies are used in this document:
ERO: Explicit Route Object.
LSP: Label Switched Path.
PCC: Path Computation Client.
PCE: Path Computation Element
PCEP: Path Computation Element Protocol.
PPAG: Path Protection Association Group.
TLV: Type, Length, and Value.
3. PCEP Extensions
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3.1. Path Protection Association Type
LSPs are not associated by listing the other LSPs with which they
interact, but rather by making them belong to an association group
referred to as "Path Protection Association Group" (PPAG) in this
document. All LSPs join a PPAG individually. PPAG is based on the
generic Association object used to associate two or more LSPs
specified in [I-D.ietf-pce-association-group]. A member of a PPAG
can take the role of working or protection LSP. This document
defines a new association type called "Path Protection Association
Type" of value TBD1. A PPAG can have one working LSP and/or one or
more protection LSPs. The source, destination and Tunnel ID (as
carried in LSP-IDENTIFIERS TLV [RFC8231], with description as per
[RFC3209]) of all LSPs within a PPAG MUST be the same. As per
[RFC3209], TE tunnel is used to associate a set of LSPs during
reroute or to spread a traffic trunk over multiple paths.
The format of the Association object used for PPAG is specified in
[I-D.ietf-pce-association-group] and reproduced in this document for
easy reference in Figure 1 and Figure 2.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | Flags |R|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Association type = TBD1 | Association |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv4 Association Source |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// Optional TLVs //
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: PPAG IPv4 ASSOCIATION Object format
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Reserved | Flags |R|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Association Type = TBD1 | Association |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| IPv6 Association Source |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// Optional TLVs //
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: PPAG IPv6 ASSOCIATION Object format
This document defines a new Association type, the Path Protection
Association type, value will be assigned by IANA (TBD1).
This Association-Type is dynamic in nature and created by the PCC or
PCE for the LSPs belonging to the same TE tunnel (as described in
[RFC3209]) originating at the same head node and terminating at the
same destination. These associations are conveyed via PCEP messages
to the PCEP peer. Operator-configured Association Range SHOULD NOT
be set for this association-type and MUST be ignored.
3.2. Path Protection Association TLV
The Path Protection Association TLV is an optional TLV for use with
the Path Protection Association Object Type. The Path Protection
Association TLV MUST NOT be present more than once. If it appears
more than once, only the first occurrence is processed and any others
MUST be ignored.
The Path Protection Association TLV follows the PCEP TLV format of
[RFC5440].
The type (16 bits) of the TLV is to be assigned by IANA. The length
field is 16 bit-long and has a fixed value of 4.
The value comprises a single field, the Path Protection Association
Flags (32 bits), where each bit represents a flag option.
The format of the Path Protection Association TLV (Figure 3) is as
follows:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type = TBD2 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Path Protection Association Flags |S|P|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 3: Path Protection Association TLV format
P (PROTECTION-LSP 1 bit) - Indicates whether the LSP associated with
the PPAG is working or protection LSP. If this flag is set, the LSP
is a protection LSP.
S (STANDBY 1 bit)- When the P flag is set, the S flag indicates
whether the protection LSP associated with the PPAG is in standby
mode. The S flag is ignored if the P flag is not set.
Unassigned bits are considered reserved. They MUST be set to 0 on
transmission and MUST be ignored on receipt. If the Path Protection
Association TLV is missing, it means the LSP is the working LSP.
4. Operation
LSPs are associated with other LSPs with which they interact by
adding them to a common association group via ASSOCIATION object.
All procedures and error-handling for the ASSOCIATION object is as
per [I-D.ietf-pce-association-group].
4.1. PCC Initiated LSPs
A PCC can associate a set of LSPs under its control for path
protection purpose. Similarly, the PCC can remove on or more LSPs
under its control from the corresponding PPAG. In both cases, the
PCC must report the change in association to PCE(s) via PCRpt
message. A PCC can also delegate the working and protection LSPs to
a stateful PCE, where PCE would control the LSPs. The stateful PCE
could update the paths and attributes of the LSPs in the association
group via PCUpd message. A PCE could also update the association to
PCC via PCUpd message. The procedures are described in
[I-D.ietf-pce-association-group].
4.2. PCE Initiated LSPs
A PCE can create/update working and protection LSPs independently.
As specified in [I-D.ietf-pce-association-group], Association Groups
can be created by both PCE and PCC.
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Further, a PCE can remove a protection LSP from a PPAG as specified
in [I-D.ietf-pce-association-group].
4.3. State Synchronization
During state synchronization, a PCC MUST report all the existing path
protection association groups as well as any path protection flags to
PCE(s). Following the state synchronization, the PCE would remove
all stale information as per [I-D.ietf-pce-association-group].
4.4. Session Termination
As per [I-D.ietf-pce-association-group] the association information
is cleared along with the LSP state information. When a PCEP session
is terminated, after expiry of State Timeout Interval at PCC, the LSP
state associated with that PCEP session is reverted to operator-
defined default parameters or behaviors as per [RFC8231]. Same
procedure is also followed for the association information. On
session termination at the PCE, when the LSP state reported by PCC is
cleared, the association information is also cleared. Where there
are no LSPs in a association group, the association is considered to
be deleted..
4.5. Error Handling
All LSPs (working or protection) within a PPAG MUST belong to the
same TE Tunnel (as described in [RFC3209]) and have the same source
and destination. If a PCE attempts to add an LSP to a PPAG and the
Tunnel ID (as carried in LSP-IDENTIFIERS TLV [RFC8231], with
description as per [RFC3209]) or source or destination of the LSP is
different from the LSP(s) in the PPAG, the PCC MUST send PCErr with
Error-Type= TBD (Association Error) [I-D.ietf-pce-association-group]
and Error-Value = TBD3 (Tunnel ID or End points mismatch for Path
Protection Association).
There MUST be only one working LSP within a PPAG. If a PCEP Speaker
attempts to add another working LSP, the PCEP peer MUST send PCErr
with Error-Type=TBD (Association Error)
[I-D.ietf-pce-association-group] and Error-Value = TBD4 (Attempt to
add another working LSP for Path Protection Association).
5. Other considerations
The diversity requirement for a group of LSPs is handled via another
association type called "Disjointness Association", as described in
[I-D.ietf-pce-association-diversity]. The diversity requirements for
the the protection LSP are also handled by including both ASSOCIATION
object for the group of LSPs.
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6. IANA considerations
6.1. Association Type
This document defines a new association type, originally defined in
[I-D.ietf-pce-association-group], for path protection. IANA is
requested to make the assignment of a new value for the sub-registry
"ASSOCIATION Type Field" (request to be created in
[I-D.ietf-pce-association-group]), as follows:
+----------------------+-------------------------+------------------+
| Association Type | Association Name | Reference |
| Value | | |
+----------------------+-------------------------+------------------+
| TBD1 | Path Protection | This |
| | Association | document |
+----------------------+-------------------------+------------------+
6.2. PPAG TLV
This document defines a new TLV for carrying additional information
of LSPs within a path protection association group. IANA is
requested to make the assignment of a new value for the existing
"PCEP TLV Type Indicators" registry as follows:
+---------------+-----------------------------------+---------------+
| TLV Type | TLV Name | Reference |
| Value | | |
+---------------+-----------------------------------+---------------+
| TBD2 | Path Protection Association Group | This document |
| | TLV | |
+---------------+-----------------------------------+---------------+
This document requests that a new sub-registry, named "Path
protection Association Group TLV Flag Field", is created within the
"Path Computation Element Protocol (PCEP) Numbers" registry to manage
the Flag field in the Path Protection Association Group TLV. New
values are to be assigned by Standards Action [RFC8126]. Each bit
should be tracked with the following qualities:
Each bit should be tracked with the following qualities:
o Bit number (count from 0 as the most significant bit)
o Name flag
o Reference
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+------------+--------------------+----------------+
| Bit Number | Name | Reference |
+------------+--------------------+----------------+
| 31 | P - PROTECTION-LSP | This document |
| 30 | S - STANDBY | This document |
+------------+--------------------+----------------+
Table 1: PPAG TLV
6.3. PCEP Errors
This document defines new Error-Type and Error-Value related to path
protection association. IANA is requested to allocate new error
values within the "PCEP-ERROR Object Error Types and Values" sub-
registry of the PCEP Numbers registry, as follows:
+------------+-------------------+----------------------------------+
| Error-Type | Meaning | Reference |
+------------+-------------------+----------------------------------+
| TBD | Association error | [I-D.ietf-pce-association-group] |
| | Error-value=TBD3: | This document |
| | Tunnel ID or End | |
| | points mismatch | |
| | for Path | |
| | Protection | |
| | Association | |
| | Error-value=TBD4: | This document |
| | Attempt to add | |
| | another working | |
| | LSP for Path | |
| | Protection | |
| | Association | |
+------------+-------------------+----------------------------------+
7. Security Considerations
The security considerations described in [RFC8231],
[I-D.ietf-pce-pce-initiated-lsp], and [RFC5440] apply to the
extensions described in this document as well. Additional
considerations related to associations where a malicious PCEP speaker
could be spoofed and could be used as an attack vector by creating
associations is described in [I-D.ietf-pce-association-group]. Thus
securing the PCEP session using Transport Layer Security (TLS)
[I-D.ietf-pce-pceps], as per the recommendations and best current
practices in [RFC7525], is RECOMMENDED.
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8. Manageability Considerations
8.1. Control of Function and Policy
Mechanisms defined in this document do not imply any control or
policy requirements in addition to those already listed in [RFC5440],
[RFC8231], and [I-D.ietf-pce-pce-initiated-lsp].
8.2. Information and Data Models
[RFC7420] describes the PCEP MIB, there are no new MIB Objects for
this document.
The PCEP YANG module [I-D.ietf-pce-pcep-yang] supports associations.
8.3. Liveness Detection and Monitoring
Mechanisms defined in this document do not imply any new liveness
detection and monitoring requirements in addition to those already
listed in [RFC5440], [RFC8231], and [I-D.ietf-pce-pce-initiated-lsp].
8.4. Verify Correct Operations
Mechanisms defined in this document do not imply any new operation
verification requirements in addition to those already listed in
[RFC5440], [RFC8231], and [I-D.ietf-pce-pce-initiated-lsp].
8.5. Requirements On Other Protocols
Mechanisms defined in this document do not imply any new requirements
on other protocols.
8.6. Impact On Network Operations
Mechanisms defined in this document do not have any impact on network
operations in addition to those already listed in [RFC5440],
[RFC8231], and [I-D.ietf-pce-pce-initiated-lsp].
9. Acknowledgments
We would like to thank Jeff Tantsura and Xian Zhang for their
contributions to this document.
10. References
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10.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC3209] Awduche, D., Berger, L., Gan, D., Li, T., Srinivasan, V.,
and G. Swallow, "RSVP-TE: Extensions to RSVP for LSP
Tunnels", RFC 3209, DOI 10.17487/RFC3209, December 2001,
<https://www.rfc-editor.org/info/rfc3209>.
[RFC5440] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation
Element (PCE) Communication Protocol (PCEP)", RFC 5440,
DOI 10.17487/RFC5440, March 2009,
<https://www.rfc-editor.org/info/rfc5440>.
[RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for
Writing an IANA Considerations Section in RFCs", BCP 26,
RFC 8126, DOI 10.17487/RFC8126, June 2017,
<https://www.rfc-editor.org/info/rfc8126>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8231] Crabbe, E., Minei, I., Medved, J., and R. Varga, "Path
Computation Element Communication Protocol (PCEP)
Extensions for Stateful PCE", RFC 8231,
DOI 10.17487/RFC8231, September 2017,
<https://www.rfc-editor.org/info/rfc8231>.
[I-D.ietf-pce-pce-initiated-lsp]
Crabbe, E., Minei, I., Sivabalan, S., and R. Varga, "PCEP
Extensions for PCE-initiated LSP Setup in a Stateful PCE
Model", draft-ietf-pce-pce-initiated-lsp-10 (work in
progress), June 2017.
[I-D.ietf-pce-association-group]
Minei, I., Crabbe, E., Sivabalan, S., Ananthakrishnan, H.,
Dhody, D., and Y. Tanaka, "PCEP Extensions for
Establishing Relationships Between Sets of LSPs", draft-
ietf-pce-association-group-04 (work in progress), August
2017.
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10.2. Information References
[RFC4655] Farrel, A., Vasseur, J., and J. Ash, "A Path Computation
Element (PCE)-Based Architecture", RFC 4655,
DOI 10.17487/RFC4655, August 2006,
<https://www.rfc-editor.org/info/rfc4655>.
[RFC4657] Ash, J., Ed. and J. Le Roux, Ed., "Path Computation
Element (PCE) Communication Protocol Generic
Requirements", RFC 4657, DOI 10.17487/RFC4657, September
2006, <https://www.rfc-editor.org/info/rfc4657>.
[RFC7420] Koushik, A., Stephan, E., Zhao, Q., King, D., and J.
Hardwick, "Path Computation Element Communication Protocol
(PCEP) Management Information Base (MIB) Module",
RFC 7420, DOI 10.17487/RFC7420, December 2014,
<https://www.rfc-editor.org/info/rfc7420>.
[RFC7525] Sheffer, Y., Holz, R., and P. Saint-Andre,
"Recommendations for Secure Use of Transport Layer
Security (TLS) and Datagram Transport Layer Security
(DTLS)", BCP 195, RFC 7525, DOI 10.17487/RFC7525, May
2015, <https://www.rfc-editor.org/info/rfc7525>.
[RFC8051] Zhang, X., Ed. and I. Minei, Ed., "Applicability of a
Stateful Path Computation Element (PCE)", RFC 8051,
DOI 10.17487/RFC8051, January 2017,
<https://www.rfc-editor.org/info/rfc8051>.
[I-D.ietf-pce-pceps]
Lopez, D., Dios, O., Wu, Q., and D. Dhody, "Secure
Transport for PCEP", draft-ietf-pce-pceps-18 (work in
progress), September 2017.
[I-D.ietf-pce-pcep-yang]
Dhody, D., Hardwick, J., Beeram, V., and j.
jefftant@gmail.com, "A YANG Data Model for Path
Computation Element Communications Protocol (PCEP)",
draft-ietf-pce-pcep-yang-05 (work in progress), June 2017.
[I-D.ietf-pce-association-diversity]
Litkowski, S., Sivabalan, S., Barth, C., and D. Dhody,
"Path Computation Element communication Protocol extension
for signaling LSP diversity constraint", draft-ietf-pce-
association-diversity-02 (work in progress), September
2017.
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Authors' Addresses
Hariharan Ananthakrishnan
Packet Design
1 South Almaden Blvd, #1150,
San Jose, CA, 95113
USA
EMail: hari@packetdesign.com
Siva Sivabalan
Cisco
2000 Innovation Drive
Kananta, Ontaria K2K 3E8
Canada
EMail: msiva@cisco.com
Colby Barth
Juniper Networks
1194 N Mathilda Ave,
Sunnyvale, CA, 94086
USA
EMail: cbarth@juniper.net
Raveendra Torvi
Juniper Networks
1194 N Mathilda Ave,
Sunnyvale, CA, 94086
USA
EMail: rtorvi@juniper.net
Ina Minei
Google, Inc
1600 Amphitheatre Parkway
Mountain View, CA, 94043
USA
EMail: inaminei@google.com
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Edward Crabbe
Individual Contributor
EMail: edward.crabbe@gmail.com
Dhruv Dhody
Huawei Technologies
Divyashree Techno Park, Whitefield
Bangalore, Karnataka 560066
India
EMail: dhruv.ietf@gmail.com
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