Network Working Group K. Ishiguro

Network Working Group K. Ishiguro
Request for Comments: 5329 V. Manral
Category: Standards Track IP Infusion, Inc
A. Davey
Data Connection Limited
A. Lindem, Ed.
Redback Networks
September 2008

Traffic Engineering Extensions to OSPF Version 3

Status of This Memo

This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The IETF Trust (2008).

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.

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RFC 5329 OSPFv3-Traffic Engineering September 2008

Table of Contents

1. Introduction ....................................................2
1.1. Requirements Notation ......................................2
2. Intra-Area-TE-LSA ...............................................3
2.1. Intra-Area-TE-LSA Payload ..................................4
3. Router IPv6 Address TLV .........................................4
4. Link TLV ........................................................5
4.1. Link ID Sub-TLV ............................................6
4.2. Neighbor ID Sub-TLV ........................................6
4.3. Local Interface IPv6 Address Sub-TLV .......................6
4.4. Remote Interface IPv6 Address Sub-TLV ......................7
5. Security Considerations .........................................8
6. Management Considerations .......................................8
7. IANA Considerations .............................................9
8. References ......................................................9
8.1. Normative References .......................................9
8.2. Informative References ....................................10
Acknowledgments ...................................................10

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 RFC 2119
[RFC-KEYWORDS].

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RFC 5329 OSPFv3-Traffic Engineering September 2008

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 Link State 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... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

TLV Format

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RFC 5329 OSPFv3-Traffic Engineering September 2008

The Length field defines the length of the value portion in octets
(thus, a TLV with no value portion would have a length of 0). The
TLV is padded to 4-octet alignment; padding is not included in the
Length field (so a 3-octet value would have a length of 3, but the
total size of the TLV would be 8 octets). Nested TLVs are also 32-
bit aligned. For example, a 1-byte value would have the Length field
set to 1, and 3 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

3. Router IPv6 Address TLV

The Router IPv6 Address TLV advertises a reachable IPv6 address.
This is a stable IPv6 address that SHOULD be 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.

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RFC 5329 OSPFv3-Traffic Engineering September 2008

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

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)

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The Neighbor ID sub-TLV is mandatory for OSPFv3 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 5340 [OSPFV3], A.4.3 Router-LSAs.

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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RFC 5329 OSPFv3-Traffic Engineering September 2008

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
128 and the LA-bit set MAY be advertised.

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RFC 5329 OSPFv3-Traffic Engineering September 2008

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

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.

6. Management Considerations

The typical management interface for routers running the new
extensions to OSPF for intra-area Traffic Engineering is Simple
Network Management Protocol (SNMP) based. The extra management

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RFC 5329 OSPFv3-Traffic Engineering September 2008

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 ospfv3AreaEntry 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 ospfv3IfEntry 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.

7. IANA Considerations

The following IANA assignments have been made from existing
registries:

1. The OSPFv3 LSA type function code 10 has been assigned to the
OSPFv3 Intra-Area-TE-LSA.

2. The Router IPv6 Address TLV type 3 has been assigned from the
existing registry for OSPF TE TLVs.

3. The Neighbor ID (18), Local Interface IPv6 Address (19), and
Remote Interface IPv6 Address (20) sub-TLVs have been assigned
from the existing registry for OSPF TE sub-TLVs.

8. References

8.1. Normative References

[OSPFV2] Moy, J., "OSPF Version 2", STD 54, RFC 2328, April
1998.

[OSPFV3] Coltun, R., Ferguson, D., Moy, J., and A. Lindem,
"OSPF for IPv6", RFC 5340, July 2008.

[RFC-KEYWORDS] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.

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RFC 5329 OSPFv3-Traffic Engineering September 2008

[TE] Katz, D., Kompella, K., and D. Yeung, "Traffic
Engineering (TE) Extensions to OSPF Version 2", RFC
3630, September 2003.

8.2. Informative References

[GMPLS] Kompella, K., Ed., and Y. Rekhter, Ed., "OSPF
Extensions in Support of Generalized Multi-Protocol
Label Switching (GMPLS)", RFC 4203, October 2005.

[OPAQUE] Berger, L., Bryskin, I., Zinin, A., and R. Coltun,
"The OSPF Opaque LSA Option", RFC 5250, July 2008.

[OSPFV3-MIB] Joyal, D. and V. Manral, "Management Information Base
for OSPFv3", Work in Progress, September 2007.

[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, May
2002.

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 in the context of the IESG review.

Thanks to Dave Ward, Tim Polk, Jari Arkko, 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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RFC 5329 OSPFv3-Traffic Engineering September 2008

Authors' Addresses

Kunihiro Ishiguro
IP Infusion, Inc.
1188 East Arques Avenue,
Sunnyvale, CA 94085
USA

EMail: [email protected]

Vishwas Manral
IP Infusion, Inc
#41, Ground Floor, 5th Cross Road
8th Main Road
Vasanth Nagar, Bangalore 560052
India

EMail: [email protected]

Alan Davey
Data Connection Limited
100 Church Street
Enfield
EN2 6BQ
UK

EMail: [email protected]

Acee Lindem
Redback Networks
102 Carric Bend Court
Cary, NC 27519
USA

EMail: [email protected]

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RFC 5329 OSPFv3-Traffic Engineering September 2008

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Ishiguro, et al. Standards Track [Page 12]