PCE Working Group S. Kuppani
Internet-Draft A. Sinha
Intended status: Experimental Huawei Technologies
Expires: November 17, 2016 May 16, 2016
PCEP Flowspec Synchronization Procedures.
draft-kuppani-pce-pcep-flowspec-sync-00
Abstract
Dissemination of the traffic flow specifications was first introduced
in the BGP protocol via RFC 5575. In order to distribute the flow
specifications from PCE controller to network device without BGP
protocol it is desirable to extend PCEP with flow specification
information.
[I-D.li-pce-pcep-flowspec] specifies a set of extensions to PCEP to
support dissemination of flow specifications. The extensions include
the instantiation, updation and deletion of flow specifications.
Flow specifications downloaded to forwarding entries requires a
reliable synchronization mechanism between the path computation
clients (PCCs) and the PCE. This draft specify the flow
specification synchronization mechanism for managing of flow
specification (FLOwSPEC-DB) at node (PCC) aligning with FLOWSPEC-DB
at PCE on initial session UP or session flap and specifies the
required Path Computation Element Communication Protocol (PCEP)
extensions.
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 http://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 November 17, 2016.
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Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. FLOWSPEC-DB Synchronization . . . . . . . . . . . . . . . . . 3
3. Full FLOWSPEC-DB Synchronization procedure . . . . . . . . . 4
4. Optimizations for FLOWSPEC-DB Synchronization . . . . . . . . 6
4.1. FLOWSPEC-DB Synchronization Avoidance Procedure . . . . . 6
4.2. Incremental FLOWSPEC-DB Synchronization Procedure . . . . 10
5. PCEP Extensions . . . . . . . . . . . . . . . . . . . . . . . 12
5.1. SRP object . . . . . . . . . . . . . . . . . . . . . . . 12
5.2. Extension of FlowSpec Capability TLV . . . . . . . . . . 12
5.3. New FLOWSPEC-DB-VERSION TLV . . . . . . . . . . . . . . . 13
6. Manageability Considerations . . . . . . . . . . . . . . . . 14
7. Security Considerations . . . . . . . . . . . . . . . . . . . 14
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 14
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 14
10.1. Normative References . . . . . . . . . . . . . . . . . . 14
10.2. Informative References . . . . . . . . . . . . . . . . . 15
Appendix A. Contributor Addresses . . . . . . . . . . . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
1. Introduction
[I-D.li-pce-pcep-flowspec] specify the procedures and PCEP protocol
extensions to support dissemination of flow specifications and
includes the creation, updation and withdrawal of flow specifications
via PCEP.
Flow specifications downloaded to forwarding entries requires a
reliable synchronization mechanism between the path computation
clients (PCCs) and the PCE. This draft specify the PCE maintenance
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of flow specification database per session, and describes the flow
specification(FLOWSPEC-DB) synchronization mechanism for managing of
flow specification database at node (PCC) aligning with flow
specification database at PCE on initial session UP or session flap
and specifies the required Path Computation Element Communication
Protocol (PCEP) extensions.
This draft specify the optimizations for FLOWSPEC-DB synchronization
and the corresponding PCEP procedures and extensions.
1.1. 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 [RFC2119].
2. FLOWSPEC-DB Synchronization
PCE MUST maintains the FLOWSPEC-DB for each PCEP session separately.
The purpose of FLOWSPEC-DB synchronization is to make sure that the
PCE's view of FLOWSPEC-DB matches with the PCC's FLOWSPEC-DB. The
FLOWSPEC-DB synchronization MUST be performed from PCE to PCC
immediately after the LSP state and label database synchronization.
[I-D.ietf-pce-stateful-pce] describes the basic mechanism for LSP
state synchronization. [I-D.ietf-pce-stateful-sync-optimizations]
describes the optimizations for LSP state synchronization.
[I-D.palle-pce-controller-labeldb-sync] describes the Label database
synchronization.
By default a Full FLOWSPEC-DB is performed from PCE to PCC on Initial
session UP or every session flap. see Section 3 for detail
procedures.
But a Full FLOWSPEC-DB synchronization is not always necessary
following a PCEP session restart and providing an Optimizations for
FLOWSPEC-DB synchronization can result in significant savings in both
control-plane data exchanges and the time it takes for the PCC to
become fully operational.
Optimizations for FLOWSPEC-DB synchronization describes the need that
both PCEP speakers support flowspec database version capability and
maintain flowspec database version for each session. See Section 4
for detail procedures.
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3. Full FLOWSPEC-DB Synchronization procedure
During Full FLOWSPEC-DB Synchronization, a PCE first takes a snapshot
of the FLOWSPEC database for the session, then sends this snapshot to
the PCC in a sequence of FlowSpec message (FlowSpec message defined
in [I-D.li-pce-pcep-flowspec]). Each FlowSpec message sent during
FLOWSPEC-DB Synchronization has the SYNC Flag in the SRP Object(see
Section 5.1) set to 1.
The end of synchronization marker is a FlowSpec message with the SYNC
Flag set to 0 for SRP Object with Flow ID equal to reserved value 0
in the FLOW object ([I-D.li-pce-pcep-flowspec]). If the PCE has no
flow to synchronize, it will only send the end of synchronization
marker.
A PCE SHOULD NOT send FlowSpec messages to a PCC before FLOWSPEC-DB
Synchronization is complete.
Either the PCE or the PCC MAY terminate the session using the PCEP
session termination procedures during the FLOWSPEC-DB synchronization
phase. If the session is terminated, the PCC MUST clean up flow(s)
it received from this PCE. The session reestablishment MUST be re-
attempted as per the procedures defined in [RFC5440], including use
of a back-off timer.
The PCC does not send positive acknowledgements for properly received
flowspec database synchronization messages. It MUST respond with a
PCErr message with Error-type TBD1 (Flow specification Database
Synchronization Error) and Error-value 1 (indicating an error in
processing the FlowSpec) if it encounters a problem with the Flow
Update it received from the PCE and it MUST terminate the session.
If the PCE encounters a problem which prevents it from completing the
flow transfer, it MUST send a PCErr message with Error-type TBD1
(Flow specification Database Synchronization Error) and Error-value 2
(indicating an internal PCE Error) to the PCC and terminate the
session.
The successful FLOWSPEC-DB Synchronization sequence is shown in
Figure 1.
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+-+-+-+ +-+-+
|PCE | |PCC|
+-+-+-+ +-+-+
| |
|-----FlowSpec, SYNC=1------->| (Sync start)
| |
|-----FlowSpec, SYNC=1------->|
| . |
| . |
| . |
|-----FlowSpec, SYNC=1------->|
| . |
| . |
| . |
| |
|-----FlowSpec, SYNC=0------->| (End of sync marker
| | Flow Update
| | FLOW ID =0)
| | (Sync done)
Figure 1: Successful FLOWSPEC-DB synchronization
The sequence where the PCC fails during the FLOWSPEC-DB
Synchronization phase is shown in Figure 2.
+-+-+-+ +-+-+
|PCE | |PCC|
+-+-+-+ +-+-+
| |
|--------FlowSpec, SYNC=1------->| (Sync start)
| |
|--------FlowSpec, SYNC=1------->|
| . |
| . |
| . |
|--------FlowSpec, SYNC=1------->|
| |
|---FlowSpec, SYNC=1 |
| \ ,----PCErr ----|
| \ / |
| \/ |
| /\ |
| / `------------->| (Ignored)
|<-----------` |
Figure 2: Failed FLOWSPEC-DB synchronization(PCC failure)
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The sequence where the PCE fails during the FLOWSPEC-DB
Synchronization phase is shown in Figure 3.
+-+-+-+ +-+-+
|PCE | |PCC|
+-+-+-+ +-+-+
| |
|-----FlowSpec, SYNC=1------->| (Sync start)
| |
|-----FlowSpec, SYNC=1------->|
| . |
| . |
| . |
|----------- PCErr=? -------->|
| |
Figure 3: Failed FLOWSPEC-DB synchronization(PCE failure)
4. Optimizations for FLOWSPEC-DB Synchronization
This section add some of the optimization mechanisms for FLOWSPEC-DB
synchronization. By default, the full FLOWSPEC-DB synchronization is
performed.
4.1. FLOWSPEC-DB Synchronization Avoidance Procedure
The FLOWSPEC-DB synchronization MAY be skipped following a PCEP
session restart if there is no change in the FLOWSPEC-DB of the
session at PCE, during the period prior to session re-initialization.
To be able to make this determination, flows must be exchanged and
maintained by both PCE and PCC during normal operation. This is
accomplished by keeping track of the changes to the flow database,
using a version tracking field called the Flowspec Database Version
Number.
The Flowspec Database Version Number, carried in FLOWSPEC-DB-VERSION
TLV (see Section 5.3), is owned by a PCE and it MUST be incremented
by 1 for each successive change in the PCE's flowspec database. The
Flowspec Database Version Number MUST start at 1 and may wrap around.
Values 0 and 0xFFFFFFFFFFFFFFFF are reserved. If either of the two
values are used during FLOWSPEC-DB synchronization, the PCC speaker
receiving this node should send back a PCErr with Error-type TBD1
Error-value 3 'Received an invalid Flowspec Database Version Number',
and close the PCEP session. Operations that trigger a change to the
Flowspec database include an addition or deletion of flows that would
trigger a flow update to the PCC.
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FLOWSPEC-DB synchronization avoidance is advertised on a PCEP session
during session startup using the INCLUDE-FLOWSPEC-DB-VERSION (I) bit
in the PCE FlowSpec capability TLV (see Section 5.2). The PCEP peer
MAY include the SPEAKER-ENTITY-ID TLV described in
[I-D.ietf-pce-stateful-sync-optimizations] in the OPEN message to
identify the peer in case of IP address change.
If both PCEP speakers set the I flag in the OPEN object's PCE
FlowSpec Capability TLV to 1, the PCE MUST include the FLOWSPEC-DB-
VERSION TLV in each FLOW object of the FlowSpec message. If the
FLOWSPEC-DB-VERSION TLV is missing in a FlowSpec message, the PCC
will generate an error with Error-Type 6 (mandatory object missing)
and Error-Value TBD2 'FLOWSPEC-DB-VERSION TLV missing' and close the
session. If FLOWSPEC-DB synchronization avoidance has not been
enabled on a PCEP session, the PCE SHOULD NOT include the FLOWSPEC-
DB-VERSION TLV in the FLOWSPEC Object and the PCC SHOULD ignore it
were it to receive one.
If a PCC's flow specification database survived the restart of a PCEP
session, the PCC will include the FLOWSPEC-DB-VERSION TLV in its OPEN
object, and the TLV will contain the last Flowspec Database Version
Number received on an Flow Update from the PCE in the previous PCEP
session. If a PCE's Flowspec Database survived the restart of a PCEP
session, the PCE will include the FLOWSPEC-DB-VERSION TLV in its OPEN
object and the TLV will contain the latest Flowspec Database Version
Number. If a PCEP speaker's flowspec database did not survive the
restart of a PCEP session, the PCEP speaker MUST NOT include the
FLOWSPEC-DB-VERSION TLV in the OPEN object.
If both PCEP speakers include the FLOWSPEC-DB-VERSION TLV in the OPEN
Object and the TLV values match, the PCE MAY skip FLOWSPEC-DB
synchronization. Otherwise, the PCE MUST perform full FLOWSPEC-DB
synchronization (see Section 3) or incremental FLOWSPEC-DB
synchronization (see Section 4.2) to the PCC, Incase, the PCE
attempts to skip FLOWSPEC-DB synchronization, by setting the SYNC
Flag to 0 on the first Flow Update from the PCE, the PCC MUST send
back a PCErr with Error-type TBD1 (Flowspec Database Synchronization
Error) and Error-value 4(Flowspec Database Version mismatch), and
close the PCEP session.
If FLOWSPEC-DB synchronization is required, then prior to completing
the initialization phase, the PCC MUST mark any flows in the flowspec
database that were previously updated by the PCE as stale. When the
PCE updates a flow during FLOWSPEC-DB synchronization, if the flow
already exists in the flowspec database, the PCC MUST update the
flowspec database and clear the stale marker from the flow. When it
has finished FLOWSPEC-DB synchronization, the PCE MUST immediately
send an end of synchronization marker. The end of synchronization
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marker is a Path Computation flowspec (FlowSpec) message with a SRP
object containing the SYNC flag set to 0 (see Section 5.1) and Flow
ID as 0 in the FLOW object. The FLOWSPEC-DB-VERSION TLV MUST be
included in this FlowSpec message. On receiving this flow Update,
the PCC MUST purge any flows from the flowspec database that are
still marked as stale.
Note that a PCE/PCC MAY force FLOWSPEC-DB synchronization by not
including the FLOWSPEC-DB-VERSION TLV in its OPEN object.
Figure 4 shows an example sequence where the FLOWSPEC-DB
synchronization is skipped.
+-+-+-+ +-+-+
|PCE | |PCC|
+-+-+-+ +-+-+
| ,----Open---|
| / DBv=35 |
|--Open--, / I=1 |
| DBv=35 \ / |
| I=1 \ / |
| \/ |
| /\ |
| / `------------->| (OK to skip sync)
(Skip sync) |<--------` |
| . |
| . |
| . |
| |
|--FlowSpec,DBv=36,SYNC=0---->| (Regular
| | FlowSpec Message)
|--FlowSpec,DBv=37,SYNC=0---->| (Regular
| | FlowSpec Message)
|--FlowSpec,DBv=38,SYNC=0---->|
| |
Figure 4: FLOWSPEC-DB synchronization Skipped
Figure 5 shows an example sequence where the FLOWSPEC-DB
synchronization is performed due to flowspec database version
mismatch during the PCEP session setup. Note that the same FLOWSPEC-
DB synchronization sequence would happen if either the PCC or the PCE
would not include the FLOWSPEC- DB-VERSION TLV in their respective
Open messages.
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+-+-+-+ +-+-+
|PCE | |PCC|
+-+-+-+ +-+-+
| ,----Open---|
| / DBv=35 |
|--Open--, / I=1 |
| DBv=39 \ / |
| I=1 \ / |
| \/ |
| /\ |
| / `------------->| (Expect sync)
(Do sync) |<--------` |
| |
|--FlowSpec,DBv=39,SYNC=1---->| (Sync start)
| . |
| . |
| . |
|--FlowSpec,DBv=39,SYNC=0---->| (Sync done)
| . |(Purge flow
| . | if applicable)
| . |
|--FlowSpec,DBv=40,SYNC=0---->| (Regular
| | FlowSpec Message)
|--FlowSpec,DBv=41,SYNC=0---->| (Regular
| | FlowSpec Message)
|--FlowSpec,DBv=42,SYNC=0---->|
| |
Figure 5: FLOWSPEC-DB synchronization Performed
Figure 6 shows an example sequence where the FLOWSPEC-DB
synchronization is skipped, but because one or both PCEP speakers set
the I Flag to 0, the PCE does not send FLOWSPEC-DB-VERSION TLVs in
subsequent FlowSpec messages to the PCC. If the current PCEP session
restarts, the PCEP speakers will have to perform full FLOWSPEC-DB
synchronization, since the PCC does not know the PCE's latest
Flowspec database Version Number information.
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+-+-+-+ +-+-+
|PCE | |PCC|
+-+-+-+ +-+-+
| ,----Open---|
| / DBv=43 |
|--Open--, / I=0 |
| DBv=43 \ / |
| I=0 \ / |
| \/ |
| /\ |
| / `------------->| (OK to skip sync)
(Skip sync) |<--------` |
| . |
| . |
| . |
|------FlowSpec,SYNC=0------->| (Regular
| | FlowSpec Message)
|------FlowSpec,SYNC=0------->| (Regular
| | FlowSpec Message)
|------FlowSpec,SYNC=0------->|
| |
Figure 6: FLOWSPEC-DB Synchronization Skipped, no FLOWSPEC-DB-VERSION
TLVs sent from PCE
4.2. Incremental FLOWSPEC-DB Synchronization Procedure
If a PCC restarts and its Flowspec database survived, PCE with
mismatched Flowspec Database Version Number will send all their Flows
information (full FLOWSPEC-DB) to the PCC, even if only a small
number of changes happened. It can take a long time and consume
large communication channel bandwidth.
This section extends the idea to only synchronize the delta (changes)
in case of Flowspec Database Version Number of both PCEP peers is
non-zero and mismatch.
If both PCEP speakers include the FLOWSPEC-DB-VERSION TLV in the OPEN
object and the FLOWSPEC-DB-VERSION TLV values match, the PCE MAY skip
FLOWSPEC-DB synchronization. Otherwise, the PCE MUST perform
FLOWSPEC-DB synchronization. Incremental flow specification database
synchronization capability is advertised on a PCEP session during
session startup using the DELTA-FLOWSPEC-SYNC-CAPABILITY (D) bit in
the capabilities TLV (see Section 5.2). Instead of dumping full
FLOWSPEC-DB to the PCC again, the PCE synchronizes the delta
(changes) as described in Figure 7 when D flag and I flag is set to 1
by both PCC and PCE. Other combinations of D and I flags setting by
PCC and PCE result in full FLOWSPEC-DB synchronization procedure as
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described in Section 3. The PCE MAY force a full FLOWSPEC-DB
synchronization by setting the D flag to zero in the OPEN message.
+-+-+-+ +-+-+
|PCE | |PCC|
+-+-+-+ +-+-+
| ,----Open---|
| / DBv=35 |
|--Open--, / I=1 |
| DBv=39 \ / D=1 |
| I=1 \ / |
| D=1 \/ |
| /\ |
| / `------------->| (Expect Delta sync)
(Do sync)|<--------` | (DONOT Purge Flow)
(Delta) | |
| |
(Delta |--FlowSpec,DBv=39,SYNC=1---->|
Sync starts) | . |
| . |
| . |
| . |
|--FlowSpec,DBv=39,SYNC=0---->| (Sync done)
| |
| |
|--FlowSpec,DBv=40,SYNC=0---->| (Regular
| | FlowSpec Message)
|--FlowSpec,DBv=41,SYNC=0---->| (Regular
| | FlowSpec Message)
|--FlowSpec,DBv=42,SYNC=0---->|
| |
Figure 7: Incremental Synchronization Procedure
As per Section 4.1, the Flowspec Database Version Number is
incremented each time a change is made to the PCE's flowspec
database. Each flow is associated with the DB version at the time of
its addition. This is needed to determine which flow and what
information needs to be synchronized in incremental FLOWSPEC-DB
synchronization.
It is not necessary for a PCE to store a complete history of flowspec
database change, but rather remember the flows (including flow
addition and deletion) that happened between the PCEP session(s)
restart in order to carry out incremental FLOWSPEC-DB
synchronization. After the synchronization procedure finishes, the
PCE can dump this history information. In the example shown in
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Figure 7, the PCE needs to store the flow changes that happened
between DB Version 35 to 39 and synchronizes these changes only when
performing incremental flow update. So a PCE needs to remember at
least the flow changes that happened after an existing PCEP session
with a PCC goes down to have any chance of doing incremental
synchronization when the session is re-established.
If a PCE finds out it does not have sufficient information to
complete incremental synchronization after advertising incremental
FLOWSPEC-DB synchronization capability, it MUST send a PCErr with
Error-Type TBD1 and Error-Value 5 'A PCE indicates to a PCC that it
can not complete the FLOWSPEC-DB synchronization' and terminate the
session. The PCE SHOULD re-establish the session with the D bit set
to 0 in the OPEN message.
The other procedures and error checks remain unchanged from the full
FLOWSPEC-DB synchronization defined in Section 3.
5. PCEP Extensions
5.1. SRP object
SRP object is defined in [I-D.ietf-pce-stateful-pce] and extended in
[I-D.ietf-pce-pce-initiated-lsp]. Further,
[I-D.palle-pce-controller-labeldb-sync] added a 'SYNC' flag (S bit)
to specify the LABEL-DB synchronization operation. This document
extends the usage of the same bit for the FLOWSPEC-DB synchronization
operation as well.
The S Flag MUST be set to 1 on each FlowSpec Message sent from a PCE
during FLOWSPEC-DB Synchronization. The S Flag MUST be set to 0 in
other messages sent from the PCE.
5.2. Extension of FlowSpec Capability TLV
PCE FlowSpec Capability TLV is defined in [I-D.li-pce-pcep-flowspec].
This draft defines a new 'INCLUDE-FLOWSPEC-DB-VERSION' flag (I bit)
to specify the flowspec database version capability and 'DELTA-
FLOWSPEC-SYNC-CAPABILITY' to specify the incremental flowspec
database synchronization capability.
The format of the PCE FlowSpec Capability TLV is shown Figure 8:
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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 | Length=4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value |D|I|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 8: PCE FlowSpec Capability TLV
I (INCLUDE-FLOWSPEC-DB-VERSION - 1 bit): if set to 1 by both PCEP
Speakers, the PCE will include the FLOWSPEC-DB-VERSION TLV in each
FLOWSPEC Object.
D (DELTA-FLOWSPEC-SYNC-CAPABILITY - 1 bit): if set to 1 by a PCEP
speaker, it indicates that the PCEP speaker allows incremental
(delta) FLOWSPEC-DB synchronization.
5.3. New FLOWSPEC-DB-VERSION TLV
The Flowspec Database Version Number (FLOWSPEC-DB-VERSION) TLV is an
optional TLV that MAY be included in the OPEN object and the FLOWSPEC
object.
The format of the FLOWSPEC-DB-VERSION TLV is shown in the following
figure:
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=[TBD3] | Length=8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| FlowSpec Database Version Number |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 9: FLOWSPEC-DB-VERSION TLV format
The type of the TLV is [TBD3] and it has a fixed length of 8 octets.
The value contains a 64-bit unsigned integer, representing the
FlowSpec Database Version Number.
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6. Manageability Considerations
TBD
7. Security Considerations
TBD
8. IANA Considerations
TBD
9. Acknowledgements
This document borrows some of the structure and text from
[I-D.ietf-pce-stateful-sync-optimizations] and
[I-D.palle-pce-controller-labeldb-sync], and would like to thanks the
authors and contributors of the document.
10. References
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,
<http://www.rfc-editor.org/info/rfc2119>.
[RFC5440] Vasseur, JP., Ed. and JL. Le Roux, Ed., "Path Computation
Element (PCE) Communication Protocol (PCEP)", RFC 5440,
DOI 10.17487/RFC5440, March 2009,
<http://www.rfc-editor.org/info/rfc5440>.
[I-D.ietf-pce-stateful-pce]
Crabbe, E., Minei, I., Medved, J., and R. Varga, "PCEP
Extensions for Stateful PCE", draft-ietf-pce-stateful-
pce-14 (work in progress), March 2016.
[I-D.zhao-pce-pcep-extension-for-pce-controller]
Zhao, Q., Li, Z., Dhody, D., and C. Zhou, "PCEP Procedures
and Protocol Extensions for Using PCE as a Central
Controller (PCECC) of LSPs", draft-zhao-pce-pcep-
extension-for-pce-controller-03 (work in progress), March
2016.
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[I-D.li-pce-pcep-flowspec]
Li, Z., Chen, X., and S. Zhuang, "PCEP Extension for Flow
Specification", draft-li-pce-pcep-flowspec-00 (work in
progress), February 2016.
10.2. Informative References
[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-05 (work in
progress), October 2015.
[I-D.ietf-pce-stateful-sync-optimizations]
Crabbe, E., Minei, I., Medved, J., Varga, R., Zhang, X.,
and D. Dhody, "Optimizations of Label Switched Path State
Synchronization Procedures for a Stateful PCE", draft-
ietf-pce-stateful-sync-optimizations-05 (work in
progress), April 2016.
[I-D.palle-pce-controller-labeldb-sync]
Palle, U. and D. Dhody, "LABEL-DB Synchronization
Procedures for a PCE as a central controller(PCECC)",
draft-palle-pce-controller-labeldb-sync-00 (work in
progress), May 2016.
Kuppani & Sinha Expires November 17, 2016 [Page 15]
Internet-Draft FLOWSPEC-SYNC May 2016
Appendix A. Contributor Addresses
Dhruv Dhody
Huawei Technologies
Divyashree Techno Park, Whitefield
Bangalore, Karnataka 560066
India
Email: dhruv.ietf@gmail.com
Udayasree Palle
Huawei Technologies
Divyashree Techno Park, Whitefield
Bangalore, Karnataka 560066
India
Email: udayasree.palle@huawei.com
Authors' Addresses
Swapna Kuppani
Huawei Technologies
Divyashree Techno Park, Whitefield
Bangalore, Karnataka 560066
India
EMail: swapnak@huawei.com
Ankit Sinha
Huawei Technologies
Divyashree Techno Park, Whitefield
Bangalore, Karnataka 560066
India
EMail: Ankit.Kumar.Sinha1@huawei.com
Kuppani & Sinha Expires November 17, 2016 [Page 16]