CCAMP Working Group Vishnu Pavan Beeram (Ed)
Internet Draft Juniper Networks
Intended status: Standards Track Igor Bryskin (Ed)
ADVA Optical Networking
Expires: April 20, 2014 October 20, 2013
RSVP Graceful Setup Procedure
draft-beeram-ccamp-rsvp-graceful-setup-00.txt
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Internet-Draft RSVP Graceful Setup Procedure October 2013
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Abstract
The GMPLS RSVP-TE setup procedure for transport LSPs outlined in
[RFC3473] involves a single iteration signaling sequence. However
there are certain scenarios, where it is not feasible to make an LSP
fully operational and ready for use via the existing single-step
setup procedure. This document proposes a 2-iteration setup
procedure for gracefully bringing up transport LSPs in such cases.
Conventions used in this document
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].
Table of Contents
1. Introduction...................................................2
2. Graceful Setup Procedure.......................................3
3. Use Case.......................................................4
3.1. Lambda LSP setup..........................................4
4. Security Considerations........................................4
5. IANA Considerations............................................4
6. Normative References...........................................4
7. Acknowledgments................................................5
1. Introduction
The GMPLS RSVP-TE extensions required for setting up transport LSPs
are discussed in [RFC3473]. As per the existing setup procedure, the
signaling sequence commences with the ingress sending a PATH message
downstream. The PATH message traverses through all the intermediate
nodes and reaches the egress. The egress responds to the setup
request by sending a RESV message upstream. The setup iteration is
completed when the RESV reaches the ingress. At the end of this
iteration, the LSP is deemed operational and ready for use at the
ingress. Optionally, if the egress desires a confirmation, the
ingress would send a RESV-CONFIRM message downstream. The LSP is
deemed operational at the egress as soon as it receives the RESV-
CONFIRM.
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However, in certain cases (Section 3) there is no guarantee that the
LSP is operational and ready for use at the end of this first
iteration. This document proposes the use of a 2-iteration setup
procedure to cater to those cases. By the end of this Graceful Setup
Procedure, the end-points are guaranteed that the LSP is operational
and ready for immediate use.
2. Graceful Setup Procedure
The RSVP graceful setup procedure (illustrated in Figure 1) proposed
by this document involves two distinct steps. This setup procedure
is similar in spirit to the 2-step RSVP graceful deletion procedure
outlined in [RFC3473].
In the first step, the LSP is signaled as "non-operational" - the
PATH is sent out with the "A" (Administratively Down) bit set in the
ADMIN_STATUS object. All the resources along the path of the LSP are
allocated and bound during this iteration.
The LSP is made "operational" only in the second step - the PATH is
sent out with the "A" bit cleared in the ADMIN_STATUS. The LSP is
deemed fully operational by the egress when it receives the PATH
with the "A" bit cleared in the ADMIN_STATUS. Similarly, the LSP is
deemed ready for immediate use by the ingress when it receives the
RESV with the "A" bit cleared in the ADMIN_STATUS.
+---+ +---+ +---+ +---+
| A |---------------| B |-------------| C |---------------| D |
+---+ +---+ +---+ +---+
Step 1: Prepare the resources along the path of the LSP
PATH
Admin Status (A, R)
--------------> PATH
Admin Status (A, R)
------------> PATH
Admin Status (A, R)
-------------->
RESV
Admin Status (A)
RESV <--------------
Admin Status (A)
RESV <------------
Admin Status (A)
<--------------
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Step 2: Make the LSP operational
PATH
Admin Status (R)
--------------> PATH
Admin Status (R)
------------> PATH
Admin Status (R)
-------------->
RESV
Admin Status
RESV <--------------
Admin Status
RESV <------------
Admin Status
<--------------
Figure 1: Graceful Setup Procedure - Signaling Sequence
3. Use Case
3.1. Lambda LSP setup
After all the cross-connects are set up in both directions at each
node along the path of the LSP and the lasers are turned on at both
the ends, the Lambda LSP may still not be ready for immediate use.
Certain provisioning operations would need to be performed at each
node along the path of the LSP before it is deemed operational. By
adopting the Graceful Setup Procedure for Lambda LSPs, operations
like "enabling alarm monitoring" and "equalizing power-levels" can
get executed in the second step.
4. Security Considerations
TBD
5. IANA Considerations
None.
6. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
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Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3473] Berger, L., "Generalized Multi-Protocol Label Switching
Signaling Resource Reservation Protocol-Traffic
Engineering Extensions", RFC 3473, January 2003
7. Acknowledgments
TBD
Authors' Addresses
Vishnu Pavan Beeram
Juniper Networks
Email: vbeeram@juniper.net
John Drake
Juniper Networks
Email: jdrake@juniper.net
Gert Grammel
Juniper Networks
Email: ggrammel@juniper.net
Igor Bryskin
ADVA Optical Networking
Email: ibryskin@advaoptical.com
Pawel Brzozowski
ADVA Optical Networking
Email: pbrzozowski@advaoptical.com
Daniele Ceccarelli
Ericsson
Email: daniele.ceccarelli@ericsson.com
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