Internet DRAFT - draft-ietf-ospf-ospfv3-traffic
draft-ietf-ospf-ospfv3-traffic
Network Working Group K. Ishiguro
Internet-Draft V. Manral
Intended status: Standards Track IP Infusion, Inc
Expires: December 14, 2008 A. Davey
Data Connection Limited
A. Lindem (Editor)
Redback Networks
June 12, 2008
Traffic Engineering Extensions to OSPF version 3
draft-ietf-ospf-ospfv3-traffic-13.txt
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Copyright (C) The IETF Trust (2008).
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Abstract
This document describes extensions to OSPFv3 to support intra-area
Traffic Engineering (TE). This document extends OSPFv2 TE to handle
IPv6 networks. A new TLV and several new sub-TLVs are defined to
support IPv6 networks.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements notation . . . . . . . . . . . . . . . . . . 3
2. Intra-Area-TE-LSA . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Intra-Area-TE-LSA Payload . . . . . . . . . . . . . . . . 5
3. Router IPv6 Address TLV . . . . . . . . . . . . . . . . . . . 6
4. Link TLV . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. Link ID Sub-TLV . . . . . . . . . . . . . . . . . . . . . 7
4.2. Neighbor ID Sub-TLV . . . . . . . . . . . . . . . . . . . 7
4.3. Local Interface IPv6 Address Sub-TLV . . . . . . . . . . . 8
4.4. Remote Interface IPv6 Address Sub-TLV . . . . . . . . . . 9
5. Security Considerations . . . . . . . . . . . . . . . . . . . 11
6. Management Considerations . . . . . . . . . . . . . . . . . . 12
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8.1. Normative References . . . . . . . . . . . . . . . . . . . 14
8.2. Informative References . . . . . . . . . . . . . . . . . . 14
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16
Intellectual Property and Copyright Statements . . . . . . . . . . 17
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1. Introduction
OSPFv3 has a very flexible mechanism for adding new LS types.
Unknown LS types are flooded properly based on the flooding scope
bits in the LS type [OSPFV3]. This document defines the
Intra-Area-TE LSA to OSPFv3.
For Traffic Engineering, this document uses "Traffic Engineering
Extensions to OSPF" [TE] as a base for TLV definitions. New TLVs and
sub-TLVs are added to [TE] to extend TE capabilities to IPv6
networks. Some existing TLVs and sub-TLVs require clarification for
OSPFv3 applicability.
GMPLS [GMPLS] and the Diff-Serv MPLS Extensions [TE-DIFF] are based
on [TE]. These functions can also be extended to OSPFv3 by utilizing
the TLVs and sub-TLVs described in this document.
1.1. Requirements notation
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
[RFC-KEYWORDS].
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2. Intra-Area-TE-LSA
A new LS type is defined for the Intra-Area-TE LSA. This is
different from OSPFv2 Traffic Engineering [TE] where opaque LSAs are
used to advertise TE information [OPAQUE]. The LSA function code is
10, the U bit is set, and the scope is set to 01 for area-scoping.
When the U bit is set to 1, an OSPFv3 router must flood the LSA at
its defined flooding scope even if it does not recognize the LS type
[OSPFV3].
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| LS age |1|0|1| 10 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Link State ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Advertising Router |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| LS sequence number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| LS checksum | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+- TLVs -+
| ... |
OSPFv3 Intra-Area-TE-LSA
The Link State ID of an Intra-Area-TE LSA is an arbitrary value used
to maintain multiple Traffic Engineering LSAs. The LSA ID has no
topological significance.
The format of the TLVs within the body of an Intra-Area-TE LSA is the
same as the format used by the Traffic Engineering Extensions to OSPF
[TE]. The LSA payload consists of one or more nested Type/Length/
Value (TLV) triplets. The format of each TLV is:
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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Value... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
TLV Format
The Length field defines the length of the value portion in octets
(thus a TLV with no value portion would have a length of zero). The
TLV is padded to four-octet alignment; padding is not included in the
length field (so a three octet value would have a length of three,
but the total size of the TLV would be eight octets). Nested TLVs
are also 32-bit aligned. For example, a one-byte value would have
the length field set to 1, and three octets of padding would be added
to the end of the value portion of the TLV. Unrecognized types are
ignored.
2.1. Intra-Area-TE-LSA Payload
An Intra-Area-TE-LSA contains one top-level TLV. There are two
applicable top-level TLVs:
2 - Link TLV
3 - Router IPv6 Address TLV
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3. Router IPv6 Address TLV
The Router IPv6 Address TLV advertises a reachable IPv6 address.
This is a stable IPv6 address that is always reachable if there is
connectivity to the OSPFv3 router.
The Router IPv6 Address TLV has type 3, length 16, and a value
containing a 16 octet local IPv6 address. A Link-local address MUST
NOT be specified for this TLV. It MUST appear in exactly one Traffic
Engineering LSA originated by an OSPFv3 router supporting the TE
extensions. The Router IPv6 Address TLV is a top-level TLV as
defined in Traffic Engineering Extensions to OSPF [TE] and only one
top-level TLV may be contained in an LSA.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 3 | 16 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+- -+-+-+-+
| |
+-+-+-+- Router IPv6 Address -+-+-+-+
| |
+-+-+-+- -+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type A 16-bit field set to 3.
Length A 16-bit field that indicates the length of the value
portion in octets. For this TLV it is always 16.
Value A stable and routable IPv6 address.
Router IPv6 Address TLV
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4. Link TLV
The Link TLV describes a single link and consists of a set of sub-
TLVs [TE]. All of the sub-TLVs in [TE] other than the Link ID sub-
TLV are applicable to OSPFv3. The Link ID sub-TLV can't be used in
OSPFv3 since it is defined to use the OSPFv2 identification for the
Designated Router (DR) on multi-access networks. In OSPFv2,
neighbors on point-to-point networks and virtual links are identified
by their Router IDs while neighbors on broadcast, Non-Broadcast
Multi-Access (NBMA), and Point-to-Multipoint links are identified by
their IPv4 interface addresses (Refer to section 8.2 in [OSPFV2]).
The IPv4 interface address is not known to OSPFv3. In contrast to
OSPFv2, OSPFv3 always identifies neighboring routers by their Router
IDs (Refer to section 2.11 in [OSPFV3]).
Three new sub-TLVs for the Link TLV are defined:
18 - Neighbor ID (8 octets)
19 - Local Interface IPv6 Address (16N octets, where N is the
number of IPv6 addresses)
20 - Remote Interface IPv6 Address (16N octets, where N is the
number of IPv6 addresses)
The Neighbor ID Sub-TLV is mandatory for OSPF3 Traffic Engineering
support. It MUST appear exactly once in a Link TLV. All other sub-
TLVs defined in this document SHOULD NOT occur more than once in a
LINK TLV. If a sub-TLV is specified more than once, instances
subsequent to the first are ignored.
4.1. Link ID Sub-TLV
The Link ID sub-TLV is used in OSPFv2 to identify the other end of
the link. In OSPFv3, the Neighbor ID sub-TLV MUST be used for link
identification. In OSPFv3, The Link ID sub-TLV SHOULD NOT be sent
and MUST be ignored upon receipt.
4.2. Neighbor ID Sub-TLV
In OSPFv2, the Link ID is used to identify the other end of a link.
In OSPFv3, the combination of Neighbor Interface ID and Neighbor
Router ID is used for neighbor link identification. Both are
advertised in the Neighbor ID Sub-TLV.
Neighbor Interface ID and Neighbor Router ID values are the same as
described in RFC 2740 [OSPFV3] A.4.3 Router-LSAs.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 18 | 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Neighbor Interface ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Neighbor Router ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type A 16-bit field set to 18.
Length A 16-bit field that indicates the length of the value
portion in octets. For this sub-TLV it is always 8.
Value The neighbor's interface ID and router ID.
Neighbor ID Sub-TLV
4.3. Local Interface IPv6 Address Sub-TLV
The Local Interface IPv6 Address sub-TLV specifies the IPv6
address(es) of the interface corresponding to this link. If there
are multiple local addresses assigned to the link then they MAY all
be listed in this sub-TLV. Link-local addresses MUST NOT be included
in this sub-TLV.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 19 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+- -+-+-+-+
| |
+-+-+-+- Local Interface IPv6 Address -+-+-+-+
| |
+-+-+-+- -+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| o |
| o |
| o |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+- -+-+-+-+
| |
+-+-+-+- Local Interface IPv6 Address -+-+-+-+
| |
+-+-+-+- -+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type A 16-bit field set to 19.
Length A 16-bit field that indicates the length of the value
portion in octets. For this sub-TLV, it MUST always be a
multiple of 16 octets dependent on the number of IPv6
global addresses advertised.
Value A list of one or more local IPv6 interface addresses
each consuming 16 octets.
Local Interface IPv6 Address Sub-TLV
4.4. Remote Interface IPv6 Address Sub-TLV
The Remote Interface IPv6 Address sub-TLV advertises the IPv6
address(es) associated with the neighbor's interface. This Sub-TLV
and the Local Interface IPv6 address Sub-TLV are used to discern
amongst parallel links between OSPFv3 routers. If the Link Type is
multi-access, the Remote Interface IPv6 Address MAY be set to ::.
Alternately, an implementation MAY choose not to send this sub-TLV.
Link-local addresses MUST NOT be advertised in this sub-TLV.
Neighbor addresses advertised in Link-LSAs with a prefix length of
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128 and the LA bit set MAY be advertised.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 20 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+- -+-+-+-+
| |
+-+-+-+- Remote Interface IPv6 Address -+-+-+-+
| |
+-+-+-+- -+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| o |
| o |
| o |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+-+-+-+- -+-+-+-+
| |
+-+-+-+- Remote Interface IPv6 Address -+-+-+-+
| |
+-+-+-+- -+-+-+-+
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type A 16-bit field set to 20.
Length A 16-bit field that indicates the length of the value
portion in octets. For this sub-TLV, it MUST be a
multiple of 16 octets dependent on the number of IPv6
global addresses advertised.
Value A variable length remote interface IPv6 address list.
Remote Interface IPv6 Address Sub-TLV
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5. Security Considerations
The function described in this document does not create any new
security issues for the OSPFv3 protocol. Security considerations for
the base OSPFv3 protocol [OSPFV3] and OSPFv2 Traffic Engineering [TE]
are applicable to OSPFv3 Traffic Engineering.
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6. Management Considerations
The typical management interface for routers running the new
extensions to OSPF for intra-area Traffic Engineering is SNMP-based.
The extra management objects for configuration operations and
statistics are defined in [OSPFV3-MIB] and an implementation of the
extensions defined in this document SHOULD provide for the
appropriate hooks or instrumentation that allow for the MIB objects
to be implemented.
The following MIB variables have been added to the OSPFv3 MIB in
support of TE:
ospfv3AreaTEEnabled
This TruthValue MIB variable in the ospf3AreaEntry table entry
indicates whether or not OSPFv3 TE advertisement for OSPFv3
interfaces is enabled for the corresponding area. The default
value is FALSE.
ospfv3IfTEDisabled
This TruthValue MIB variable in the ospf3IfEntry table entry
indicates whether or not OSPFv3 TE advertisement for OSPFv3 for
the corresponding interface is disabled. This MIB variable is
only applicable if ospfv3AreaTEEnabled is TRUE for the interface's
area. The default value is FALSE.
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7. IANA Considerations
The following IANA assignments are to be made from existing
registries:
1. The OSPFv3 LSA type function code 10 needs to be assigned to the
OSPFv3 Intra-Area-TE-LSA.
2. The Router IPv6 Address TLV type 3 needs to be assigned from the
existing registry for OSPF TE TLVs.
3. The Neighbor ID Sub-TLV (18), Local Interface IPv6 Address Sub-
TLV (19), and Remote Interface IPv6 Address Sub-TLV (20), need to
be assigned from the existing registry for OSPF TE Sub-TLVs.
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8. References
8.1. Normative References
[OSPFV2] Moy, J., "OSPF Version 2", RFC 2328, April 1998.
[OSPFV3] Coltun, R., Ferguson, D., Moy, J., and A. Lindem, "OSPF
for IPv6", draft-ietf-ospf-ospfv3-update-23.txt (work in
progress).
[RFC-KEYWORDS]
Bradner, S., "Key words for use in RFC's to Indicate
Requirement Levels", RFC 2119, March 1997.
[TE] Katz, D., Yeung, D., and K. Kompella, "Traffic Engineering
Extensions to OSPF", RFC 3630, September 2003.
8.2. Informative References
[GMPLS] Kompella, K. and Y. Rekhter, "OSPF Extensions in Support
of Generalized Multi-Protocol Switching (GMPLS)",
RFC 4203, October 2005.
[OPAQUE] Coltun, R., "The OSPF Opaque LSA Option", RFC 2370,
July 1998.
[OSPFV3-MIB]
Joyal, D. and V. Manral, "Management Information Base for
OSPFv3", draft-ietf-ospf-ospfv3-mib-12.txt (work in
progress).
[TE-DIFF] Le Faucheur, F., Wu, L., Davie, B., Davari, S., Vaananen,
P., Krishnan, R., Cheval, P., and J. Heinanen, "Multi-
Protocol Label Switching (MPLS) Support of Differentiated
Services", RFC 3270.
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Appendix A. Acknowledgments
Thanks to Kireeti Kompella, Alex Zinin, Adrian Farrell, and Mach Chen
for their comments.
Thanks to Vijay K. Gurbani for providing the General Area Review Team
(Gen-ART) review.
Thanks to Rob Austein for providing the Security Directorate (secdir)
review.
Thanks to Dan Romascanu for providing the text for the "Management
Considerations" Section 6 section in the context of the IESG review.
Thanks to Dave Ward, Tim Polk, Jari Arko, and Pasi Eronen for
comments and relevant discussion in the context of the IESG review.
The RFC text was produced using Marshall Rose's xml2rfc tool.
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Authors' Addresses
Kunihiro Ishiguro
IP Infusion, Inc
125 South Market Street, Suite 900
San Jose, CA 95113
USA
Email: kunihiro@ipinfusion.com
Vishwas Manral
IP Infusion, Inc
#41, Ground Floor, 5th Cross Road
8th Main Road
Vasanth Nagar, Bangalore 560052
India
Email: vishwas@ipinfusion.com
Alan Davey
Data Connection Limited
100 Church Street
Enfield
EN2 6BQ
UK
Email: Alan.Davey@dataconnection.com
Acee Lindem
Redback Networks
102 Carric Bend Court
Cary, NC 27519
USA
Email: acee@redback.com
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