CCAMP Working Group Zafar Ali
Internet Draft George Swallow
Intended status: Standard Track Clarence Filsfils
Expires: August 2, 2014 Matt Hartley
Gabriele Maria Galimberti
Cisco Systems
Ori Gerstel
SDN Solutions Ltd.
Kenji Kumaki
KDDI Corporation
Ruediger Kunze
Deutsche Telekom AG
Julien Meuric
France Telecom Orange
February 3, 2014
Resource ReserVation Protocol-Traffic Engineering (RSVP-TE) Path
Diversity using Exclude Route
draft-ietf-ccamp-lsp-diversity-03.txt
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 August 2, 2014.
Copyright Notice
Copyright (c) 2014 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
(http://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.
Ali, Swallow, Filsfils Expires August 2014 [Page 1]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
Abstract
RFC 4874 specifies methods by which path exclusions may be
communicated during RSVP-TE signaling in networks where precise
explicit paths are not computed by the LSP source node. This
document specifies signaling for additional route exclusion
subobjects based on Paths currently existing or expected to exist
within the network.
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. RSVP-TE signaling extensions.................................4
2.1. Terminology..........................................4
2.2. Path XRO Subobjects..................................5
2.2.1. IPv4 Point-to-Point Path subobject...................... 5
2.2.2. IPv6 Point-to-Point Path subobject...................... 8
2.3. Processing rules for the Path XRO subobjects.........9
2.4. Path EXRS Subobject.................................12
3. Security Considerations.....................................13
4. IANA Considerations.........................................13
4.1. New XRO subobject types.............................13
4.2. New EXRS subobject types............................14
4.3. New RSVP error sub-codes............................14
5. Acknowledgements............................................14
6. References..................................................14
6.1. Normative Reference.................................14
6.2. Informative References..............................15
1. Introduction
Path diversity is a well-known requirement from Service Providers.
Such diversity ensures Label-Switched Paths (LSPs) may be
established without sharing resources, thus greatly reducing the
probability of simultaneous connection failures.
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 2]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
When a source node has full topological knowledge and is permitted
to signal an Explicit Route Object, diverse paths can be computed
locally. However, there are scenarios when path computations are
performed by remote nodes, thus there is a need for relevant
diversity requirements to be communicated to those nodes. These
include (but are not limited to):
. LSPs with loose hops in the Explicit Route Object (ERO), e.g.
inter-domain LSPs;
. Generalized Multi-Protocol Label Switching (GMPLS) User-
Network Interface (UNI) where path computation may be performed
by the (server layer) core node [RFC4208].
[RFC4874] introduced a means of specifying nodes and resources to
be excluded from a route, using the eXclude Route Object (XRO) and
Explicit Exclusion Route Subobject (EXRS).
[RFC4874] facilitates the calculation of diverse paths for LSPs
based on known properties of those paths including addresses of
links and nodes traversed, and Shared Risk Link Groups (SRLGs) of
traversed links. Employing these mechanisms requires that the
source node that initiates signaling knows the relevant properties
of the path(s) from which diversity is desired. However, there are
circumstances under which this may not be possible or desirable,
including (but not limited to):
. Exclusion of a path which does not originate, terminate or
traverse the source node signaling the diverse LSP, in which
case the addresses and SRLGs of the path from which diversity
is required are unknown to the source node.
. Exclusion of a path which is known to the source node of the
diverse LSP, however the node has incomplete or no path
information, e.g. due to policy. In other words, the scenario
in which the reference path is known by the source / requesting
node but the properties required to construct an XRO object are
not fully known. Inter-domain and GMPLS overlay networks can
present such restrictions.
This document defines procedures that may be used to exclude the
path taken by a particular LSP, or the paths taken by all LSPs
belonging to a single tunnel. The diversity requirements
considered in this document do not require that the paths in
question belong to the same tunnel or share the same source or
destination node.
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 3]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
If mutually diverse paths are desired for two LSPs belonging to
different tunnels, it is recommended that they be signaled with
XRO LSP subobjects referencing each other. The processing rules
specified in this document cover this case.
The means by which the node calculating or expanding the route of
the signaled LSP discovers the route of the path(s) from which
the signaled LSP requires diversity are beyond the scope of this
document.
This document addresses only the exclusion of point-to-point
paths. Exclusion of point-to-multipoint paths is beyond the scope
of this document.
2. RSVP-TE signaling extensions
This section describes the signaling extensions required to
address the aforementioned requirements. Specifically, this
document defines a new LSP subobject to be signaled in the
EXCLUDE_ROUTE object (XRO) and/ or Explicit Exclusion Route
Subobject (EXRS) defined in [RFC4874]. Inclusion of the LSP
subobject in any other RSVP object is not defined.
2.1. Terminology
In this document, the following terminology is adopted:
Excluded path: the path from which diversity is required.
Diverse LSP: the LSP being signaled with XRO/ EXRS containing the
path subobject referencing the excluded path(s).
Processing node: the node performing a path-calculation involving
exclusion specified in an XRO or EXRS.
Destination node: in the context of an XRO, this is the
destination of the LSP being signaled. In the context of an EXRS,
the destination node is the last explicit node to which the loose
hop is expanded.
Penultimate node: in the context of an XRO, this is the
penultimate hop of the LSP being signaled. In the context of an
EXRS, the penultimate node is the penultimate node of the loose
hop undergoing expansion.
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 4]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
2.2. Path XRO Subobjects
New IPv4 and IPv6 Point-to-Point (P2P) Path XRO subobjects are
defined by this document as follows.
2.2.1. IPv4 Point-to-Point Path subobject
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|L| Type | Length |Attribute Flags|Exclusion Flags|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv4 tunnel end point address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Must Be Zero | Tunnel ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Extended Tunnel ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv4 tunnel sender address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Must Be Zero | LSP ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
L:
The L-flag is used as for the other XRO subobjects defined
in [RFC4874].
0 indicates that the attribute specified MUST be excluded.
1 indicates that the attribute specified SHOULD be
avoided.
Type:
IPv4 Point-to-Point Path subobject (to be assigned by IANA;
suggested value: 36).
Length:
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 5]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
The length contains the total length of the subobject in
bytes, including the type and length fields. The length is
always 24.
Attribute Flags:
The Attribute Flags are used to communicate desirable
attributes of the LSP being signaled. The following flags
are defined. Each flag acts independently. Any combination
of flags is permitted.
0x01 = LSP ID to be ignored
Indicates tunnel level exclusion. Specifically, this
flag is used to indicate that the lsp-id field of the
subobject is to be ignored and the exclusion applies to
any LSP matching the rest of the supplied FEC.
0x02 = Destination node exception
Indicates that exclusion does not apply to the
destination node of the LSP being signaled.
0x04 = Processing node exception
Indicates that exclusion does not apply to the ERO
processing node of the LSP being signaled.
0x08 = Penultimate node exception
Indicates that the penultimate node of the LSP being
signaled MAY be shared with the excluded path even when
this violates the exclusion flags.
Indicates that exclusion does not apply to the
penultimate node of the LSP being signaled.
Exclusion Flags
The Exclusion-Flags are used to communicate the desired
type(s) of exclusion. The following flags are defined.
0x01 = SRLG exclusion
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 6]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
Indicates that the path of the LSP being signaled is
requested to be SRLG diverse from the excluded path
specified by the LSP subobject.
0x02 = Node exclusion
Indicates that the path of the LSP being signaled is
requested to be node diverse from the excluded path
specified by the LSP subobject.
(Note: the meaning of this flag may be modified by
the value of the Attribute-flags.)
0x04 = Link exclusion
Indicates that the path of the LSP being signaled is
requested to be link diverse from the path specified
by the LSP subobject.
The remaining fields are as defined in [RFC3209].
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 7]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
2.2.2. IPv6 Point-to-Point Path subobject
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|L| Type | Length |Attribute Flags|Exclusion Flags|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv6 tunnel end point address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv6 tunnel end point address (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv6 tunnel end point address (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv6 tunnel end point address (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Must Be Zero | Tunnel ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Extended Tunnel ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Extended Tunnel ID (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Extended Tunnel ID (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Extended Tunnel ID (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv4 tunnel sender address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv4 tunnel sender address (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv4 tunnel sender address (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv4 tunnel sender address (cont.) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Must Be Zero | LSP ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
L
The L-flag is used as for the other XRO subobjects defined
in [RFC4874].
0 indicates that the attribute specified MUST be excluded.
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 8]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
1 indicates that the attribute specified SHOULD be
avoided.
Type
IPv6 Point-to-Point Path subobject
(to be assigned by IANA; suggested value: 37).
Length
The length contains the total length of the subobject in
bytes, including the type and length fields. The length is
always 48.
The Attribute Flags and Exclusion Flags are as defined for the
IPv4 Point-to-Point LSP XRO subobject.
The remaining fields are as defined in [RFC3209].
2.3. Processing rules for the Path XRO subobjects
XRO processing as described in [RFC4874] is unchanged.
If the processing node is the destination for the LSP being
signaled, it SHOULD NOT process a Path XRO subobject.
If the L-flag is not set, the processing node follows the
following procedure:
- The processing node MUST ensure that any path calculated for
the signaled LSP respects the requested exclusion flags with
respect to the excluded path referenced by the subobject,
including local resources.
- If the processing node fails to find a path that meets the
requested constraint, the processing node MUST return a PathErr
with the error code "Routing Problem" (24) and error sub-code
"Route blocked by Exclude Route" (67).
- If the excluded path referenced in the LSP subobject is
unknown to the processing node, the processing node SHOULD
ignore the LSP subobject in the XRO and SHOULD proceed with the
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 9]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
signaling request. After sending the Resv for the signaled LSP,
the processing node SHOULD return a PathErr with the error code
"Notify Error" (25) and error sub-code "Route of XRO path
unknown" (value to be assigned by IANA, suggested value: 13)
for the signaled LSP.
If the L-flag is set, the processing node follows the procedure
below:
- The processing node SHOULD respect the requested exclusion
flags with respect to the excluded path to the extent possible.
- If the processing node fails to find a path that meets the
requested constraint, it SHOULD proceed with signaling using a
suitable path that meets the constraint as far as possible.
After sending the Resv for the signaled LSP, it SHOULD return a
PathErr message with error code "Notify Error" (25) and error
sub-code "Failed to respect Exclude Route" (value: to be
assigned by IANA, suggest value: 14) to the source node.
- If the excluded path referenced in the LSP subobject is
unknown to the processing node, the processing node SHOULD
ignore the LSP subobject in the XRO and SHOULD proceed with the
signaling request. After sending the Resv for signaled LSP, the
processing node SHOULD return a PathErr message with the error
code "Notify Error" (25) and error sub-code "Route of XRO path
unknown" for the signaled LSP.
If, subsequent to the initial signaling of a diverse LSP:
- an excluded path referenced in the diverse LSP's XRO
subobject becomes known to the processing node (e.g. when the
excluded path is signaled), or
- A change in the excluded path becomes known to the processing
node,
the processing node SHOULD re-evaluate the exclusion and
diversity constraints requested by the diverse LSP to determine
whether they are still satisfied.
- If the requested exclusion constraints for the diverse LSP
are no longer satisfied and an alternative path for the diverse
LSP that can satisfy those constraints exists, the processing
node SHOULD send a PathErr message for the diverse LSP with the
error code "Notify Error" (25) and a new error sub-code
"compliant path exists" (value: to be assigned by IANA, suggest
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 10]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
value: 15). A source node receiving a PathErr message with this
error code and sub-code combination MAY try to reoptimize the
diverse tunnel to the new compliant path.
- If the requested exclusion constraints for the diverse LSP
are no longer satisfied and no alternative path for the diverse
LSP that can satisfy those constraints exists, then:
o If the L-flag was not set in the original exclusion, the
processing node MUST send a PathErr message for the
diverse LSP with the error code "Routing Problem" (24) and
error sub-code "Route blocked by Exclude Route" (67). The
PSR flag SHOULD NOT be set.
o If the L-flag was set in the original exclusion, the
processing node SHOULD send a PathErr message for the
diverse LSP with the error code error code "Notify Error"
(25) and error sub-code "Failed to respect Exclude Route"
(value: to be assigned by IANA, suggest value: 14).
The following rules apply whether or not the L-flag is set:
- An XRO object MAY contain multiple path subobjects.
- A source node receiving a PathErr message with the error code
"Notify Error" (25) and error sub-codes "Route of XRO path
unknown" or "Failed to respect Exclude Route" MAY take no
action.
- The attribute-flags affect the processing of the XRO subobject
as follows:
o When the "LSP ID to be ignored" flag is set, the
processing node MUST calculate a path based on exclusions
from the paths of all known LSPs matching the tunnel-id,
source, destination and extended tunnel-id specified in
the subobject (i.e., tunnel level exclusion). When this
flag is not set, the lsp-id is not ignored and the
exclusion applies only to the specified LSP (i.e., LSP
level exclusion).
o When the "destination node exception" flag is not set, the
exclusion flags SHOULD also be respected for the
destination node.
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 11]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
o When the "processing node exception" flag is not set, the
exclusion flags SHOULD also be respected for the
processing node.
o When the "penultimate node exception" flag is not set, the
exclusion flags SHOULD also be respected for the
penultimate node.
2.4. Path EXRS Subobject
[RFC4874] defines the EXRS ERO subobject. An EXRS is used to
identify abstract nodes or resources that must not or should not
be used on the path between two inclusive abstract nodes or
resources in the explicit route. An EXRS contains one or more
subobjects of its own, called EXRS subobjects [RFC4874].
An EXRS MAY include an IPv4 Point-to-Point (P2P) Path subobject
as specified in section 2.2.1. In this case, the EXRS format
would be as follows:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|L| Type | Length | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|L| Type | Length |Attribute Flags|Exclusion Flags|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv4 tunnel end point address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Must Be Zero | Tunnel ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Extended Tunnel ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| IPv4 tunnel sender address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Must Be Zero | LSP ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The meanings of respective fields in EXRS header are as defined
in [RFC4874]. The meanings of respective fields in IPv4 P2P Path
subobject are as defined earlier in this document.
The processing rules for the EXRS object are unchanged from
[RFC4874]. When the EXRS contains one or more Path subobject(s),
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 12]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
the processing rules specified in Section 2.3 apply to the node
processing the ERO with the EXRS subobject.
If a loose-hop expansion results in the creation of another
loose-hop in the outgoing ERO, the processing node MAY include
the EXRS in the newly-created loose hop for further processing by
downstream nodes.
The processing node exception for the EXRS subobject applies to
the node processing the ERO.
The destination node exception for the EXRS subobject applies to
the explicit node identified by the ERO subobject that identifies
the next abstract node. This flag is only processed if the L bit
is set in the ERO subobject that identifies the next abstract
node.
The penultimate node exception for the EXRS subobject applies to
the node before the explicit node identified by the ERO subobject
that identifies the next abstract node. This flag is only
processed if the L bit is set in the ERO subobject that
identifies the next abstract node.
3. Security Considerations
This document does not introduce any additional security issues
above those identified in [RFC5920], [RFC2205], [RFC3209],
[RFC3473] and [RFC4874].
4. IANA Considerations
4.1. New XRO subobject types
IANA registry: RSVP PARAMETERS
Subsection: Class Names, Class Numbers, and Class Types
This document introduces two new subobjects for the EXCLUDE_ROUTE
object [RFC4874], C-Type 1.
Subobject Type
Subobject Description
--------------
---------------------
To be assigned by IANA IPv4 P2P Path subobject
(suggested value: 36)
To be assigned by IANA IPv6 P2P Path subobject
(suggested value: 37)
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 13]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
4.2. New EXRS subobject types
The IPv4 and IPv6 P2P Path subobjects are also defined as new
EXRS subobjects.
4.3. New RSVP error sub-codes
IANA registry: RSVP PARAMETERS
Subsection: Error Codes and Globally-Defined Error Value Sub-
Codes
For Error Code "Notify Error" (25) (see [RFC3209]) the following
sub-codes are defined.
Sub-code Value
-------- -----
Route of XRO path unknown To be assigned by IANA.
Suggested Value: 13.
Failed to respect Exclude Route To be assigned by IANA.
Suggested Value: 14.
Compliant path exists To be assigned by IANA.
Suggested Value: 15.
5. Acknowledgements
The authors would like to thank Luyuan Fang and Walid Wakim for
their review comments.
6. References
6.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3209] Awduche, D., Berger, L., Gan, D., Li, T., Srinivasan,
V., and G. Swallow, "RSVP-TE: Extensions to RSVP for
LSP Tunnels", RFC 3209, December 2001.
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 14]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
[RFC3473] Berger, L., "Generalized Multi-Protocol Label Switching
(GMPLS) Signaling Resource ReserVation Protocol-Traffic
Engineering (RSVP-TE) Extensions", RFC 3473, January
2003.
[RFC4874] Lee, CY., Farrel, A., and S. De Cnodder, "Exclude
Routes - Extension to Resource ReserVation Protocol-
Traffic Engineering (RSVP-TE)", RFC 4874, April 2007.
6.2. Informative References
[RFC4208] Swallow, G., Drake, J., Ishimatsu, H., and Y. Rekhter,
"Generalized Multiprotocol Label Switching (GMPLS)
User-Network Interface (UNI): Resource ReserVation
Protocol-Traffic Engineering (RSVP-TE) Support for the
Overlay Model", RFC 4208, October 2005.
[RFC2205] Braden, R. (Ed.), Zhang, L., Berson, S., Herzog, S. and
S. Jamin, "Resource ReserVation Protocol -- Version 1
Functional Specification", RFC 2205, September 1997.
[RFC5920] Fang, L., Ed., "Security Framework for MPLS and GMPLS
Networks", RFC 5920, July 2010.
Authors' Addresses
Zafar Ali
Cisco Systems.
Email: zali@cisco.com
Clarence Filsfils
Cisco Systems, Inc.
cfilsfil@cisco.com
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 15]
Internet Draft draft-ietf-ccamp-lsp-diversity-03.txt
Gabriele Maria Galimberti
Cisco Systems
ggalimbe@cisco.com
Ori Gerstel
SDN Solutions Ltd.
origerstel@gmail.com
Matt Hartley
Cisco Systems
Email: mhartley@cisco.com
Kenji Kumaki
KDDI Corporation
Email: ke-kumaki@kddi.com
Rudiger Kunze
Deutsche Telekom AG
Ruediger.Kunze@telekom.de
Julien Meuric
France Telecom Orange
Email: julien.meuric@orange.com
George Swallow
Cisco Systems
swallow@cisco.com
Ali, Swallow, Filsfils, et al Expires July 2014 [Page 16]
