draft-ietf-ospf-te-link-attr-reuse-13.txt   draft-ietf-ospf-te-link-attr-reuse-14.txt 
LSR Working Group P. Psenak, Ed. LSR Working Group P. Psenak, Ed.
Internet-Draft L. Ginsberg Internet-Draft L. Ginsberg
Intended status: Standards Track Cisco Systems Intended status: Standards Track Cisco Systems
Expires: December 7, 2020 W. Henderickx Expires: December 9, 2020 W. Henderickx
Nokia Nokia
J. Tantsura J. Tantsura
Apstra Apstra
J. Drake J. Drake
Juniper Networks Juniper Networks
June 5, 2020 June 7, 2020
OSPF Link Traffic Engineering Attribute Reuse OSPF Link Traffic Engineering Attribute Reuse
draft-ietf-ospf-te-link-attr-reuse-13.txt draft-ietf-ospf-te-link-attr-reuse-14.txt
Abstract Abstract
Existing traffic engineering related link attribute advertisements Existing traffic engineering related link attribute advertisements
have been defined and are used in RSVP-TE deployments. Since the have been defined and are used in RSVP-TE deployments. Since the
original RSVP-TE use case was defined, additional applications (e.g., original RSVP-TE use case was defined, additional applications (e.g.,
Segment Routing Traffic Engineering, Loop Free Alternate) have been Segment Routing Traffic Engineering, Loop Free Alternate) have been
defined which also make use of the link attribute advertisements. In defined which also make use of the link attribute advertisements. In
cases where multiple applications wish to make use of these link cases where multiple applications wish to make use of these link
attributes the current advertisements do not support application attributes the current advertisements do not support application
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on December 7, 2020. This Internet-Draft will expire on December 9, 2020.
Copyright Notice Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of (https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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have been originally defined for RSVP-TE applications (See have been originally defined for RSVP-TE applications (See
Section 6). Section 6).
TE link attributes used for RSVP-TE/GMPLS continue to use OSPFv2 TE TE link attributes used for RSVP-TE/GMPLS continue to use OSPFv2 TE
Opaque LSA [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329]. Opaque LSA [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329].
The format of the link attribute TLVs that have been defined for The format of the link attribute TLVs that have been defined for
RSVP-TE applications will be kept unchanged even when they are used RSVP-TE applications will be kept unchanged even when they are used
for non-RSVP-TE applications. Unique code points are allocated for for non-RSVP-TE applications. Unique code points are allocated for
these link attribute TLVs from the OSPFv2 Extended Link TLV Sub-TLV these link attribute TLVs from the OSPFv2 Extended Link TLV Sub-TLV
Registry [RFC7684] and from the OSPFv3 Extended LSA Sub-TLV Registry Registry [RFC7684] and from the OSPFv3 Extended-LSA Sub-TLV Registry
[RFC8362], as specified in Section 14. [RFC8362], as specified in Section 14.
5. Advertisement of Application Specific Values 5. Advertisement of Application Specific Values
To allow advertisement of the application specific values of the link To allow advertisement of the application specific values of the link
attribute, a new Application Specific Link Attributes (ASLA) sub-TLV attribute, a new Application Specific Link Attributes (ASLA) sub-TLV
is defined. The ASLA sub-TLV is a sub-TLV of the OSPFv2 Extended is defined. The ASLA sub-TLV is a sub-TLV of the OSPFv2 Extended
Link TLV [RFC7684] and OSPFv3 Router-Link TLV [RFC8362]. Link TLV [RFC7684] and OSPFv3 Router-Link TLV [RFC8362].
On top of advertising the link attributes for standardized On top of advertising the link attributes for standardized
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- Administrative Group [RFC3630] - Administrative Group [RFC3630]
- Extended Administrative Group [RFC7308] - Extended Administrative Group [RFC7308]
- TE Metric [RFC3630] - TE Metric [RFC3630]
6. Reused TE link attributes 6. Reused TE link attributes
This section defines the use case and indicates the code points This section defines the use case and indicates the code points
(Section 14) from the OSPFv2 Extended Link TLV Sub-TLV Registry and (Section 14) from the OSPFv2 Extended Link TLV Sub-TLV Registry and
OSPFv3 Extended LSA Sub-TLV Registry for some of the link attributes OSPFv3 Extended-LSA Sub-TLV Registry for some of the link attributes
that have been originally defined for RSVP-TE or GMPLS. that have been originally defined for RSVP-TE or GMPLS.
6.1. Shared Risk Link Group (SRLG) 6.1. Shared Risk Link Group (SRLG)
The SRLG of a link can be used in OSPF calculated IPFRR [RFC5714] to The SRLG of a link can be used in OSPF calculated IPFRR [RFC5714] to
compute a backup path that does not share any SRLG group with the compute a backup path that does not share any SRLG group with the
protected link. protected link.
To advertise the SRLG of the link in the OSPFv2 Extended Link TLV, To advertise the SRLG of the link in the OSPFv2 Extended Link TLV,
the same format for the sub-TLV defined in section 1.3 of [RFC4203] the same format for the sub-TLV defined in section 1.3 of [RFC4203]
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14 - Unidirectional Delay Variation 14 - Unidirectional Delay Variation
15 - Unidirectional Link Loss 15 - Unidirectional Link Loss
16 - Unidirectional Residual Bandwidth 16 - Unidirectional Residual Bandwidth
17 - Unidirectional Available Bandwidth 17 - Unidirectional Available Bandwidth
18 - Unidirectional Utilized Bandwidth 18 - Unidirectional Utilized Bandwidth
To advertise extended link metrics in the OSPFv3 Extended LSA Router- To advertise extended link metrics in the OSPFv3 Extended-LSA Router-
Link TLV, the same format for the sub-TLVs defined in [RFC7471] is Link TLV, the same format for the sub-TLVs defined in [RFC7471] is
used with the following TLV types: used with the following TLV types:
13 - Unidirectional Link Delay 13 - Unidirectional Link Delay
14 - Min/Max Unidirectional Link Delay 14 - Min/Max Unidirectional Link Delay
15 - Unidirectional Delay Variation 15 - Unidirectional Delay Variation
16 - Unidirectional Link Loss 16 - Unidirectional Link Loss
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with (for example) [RFC3630]. As the advertisements defined in this with (for example) [RFC3630]. As the advertisements defined in this
document limit the scope to specific applications, the impact of document limit the scope to specific applications, the impact of
tampering is similarly limited in scope. tampering is similarly limited in scope.
14. IANA Considerations 14. IANA Considerations
This specifications updates two existing registries: This specifications updates two existing registries:
- OSPFv2 Extended Link TLV Sub-TLVs Registry - OSPFv2 Extended Link TLV Sub-TLVs Registry
- OSPFv3 Extended LSA Sub-TLV Registry - OSPFv3 Extended-LSA Sub-TLV Registry
New values are allocated using the IETF Review procedure as described New values are allocated using the IETF Review procedure as described
in [RFC5226]. in [RFC5226].
14.1. OSPFv2 14.1. OSPFv2
The OSPFv2 Extended Link TLV Sub-TLVs Registry [RFC7684] defines sub- The OSPFv2 Extended Link TLV Sub-TLVs Registry [RFC7684] defines sub-
TLVs at any level of nesting for OSPFv2 Extended Link TLVs. IANA has TLVs at any level of nesting for OSPFv2 Extended Link TLVs. IANA has
assigned the following Sub-TLV types from the OSPFv2 Extended Link assigned the following Sub-TLV types from the OSPFv2 Extended Link
TLV Sub-TLVs Registry: TLV Sub-TLVs Registry:
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19 - Administrative Group 19 - Administrative Group
20 - Extended Administrative Group 20 - Extended Administrative Group
22 - TE Metric 22 - TE Metric
23 - Maximum Link Bandwidth 23 - Maximum Link Bandwidth
14.2. OSPFv3 14.2. OSPFv3
The OSPFv3 Extended LSA Sub-TLV Registry [RFC8362] defines sub-TLVs The OSPFv3 Extended-LSA Sub-TLV Registry [RFC8362] defines sub-TLVs
at any level of nesting for OSPFv3 Extended LSAs. IANA has assigned at any level of nesting for OSPFv3 Extended LSAs. IANA has assigned
the following Sub-TLV types from the OSPFv3 Extended LSA Sub-TLV the following Sub-TLV types from the OSPFv3 Extended-LSA Sub-TLV
Registry: Registry:
11 - Application Specific Link Attributes 11 - Application Specific Link Attributes
12 - Shared Risk Link Group 12 - Shared Risk Link Group
13 - Unidirectional Link Delay 13 - Unidirectional Link Delay
14 - Min/Max Unidirectional Link Delay 14 - Min/Max Unidirectional Link Delay
15 - Unidirectional Delay Variation 15 - Unidirectional Delay Variation
16 - Unidirectional Link Loss 16 - Unidirectional Link Loss
16 - Unidirectional Residual Bandwidth 17 - Unidirectional Residual Bandwidth
18 - Unidirectional Available Bandwidth 18 - Unidirectional Available Bandwidth
19 - Unidirectional Utilized Bandwidth 19 - Unidirectional Utilized Bandwidth
20 - Administrative Group 20 - Administrative Group
21 - Extended Administrative Group 21 - Extended Administrative Group
22 - TE Metric 22 - TE Metric
 End of changes. 11 change blocks. 
11 lines changed or deleted 11 lines changed or added

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