Internet DRAFT - draft-lin-idr-bgpls-te-policy-pm
draft-lin-idr-bgpls-te-policy-pm
Network Working Group C. Lin
Internet Draft M. Chen
Intended status: Standards Track H. Li
Expires: June 17, 2024 New H3C Technologies
December 20, 2023
BGP-LS Advertisement of TE Policy Performance Metric
draft-lin-idr-bgpls-te-policy-pm-02
Abstract
This document describes a way to advertise the performance metrics
for Traffic Engineering (TE) Policy using BGP Link State (BGP-LS).
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Table of Contents
1. Introduction...................................................2
1.1. Requirements Language.....................................2
2. Advertisement of TE Policy Performance Metric..................3
3. Extensions for Round-trip TE Performance Metric................3
3.1. Round-trip Delay TLV......................................3
3.2. Min/Max Round-trip Delay TLV..............................4
3.3. Round-trip Delay Variation TLV............................5
3.4. Round-trip Loss TLV.......................................5
4. Security Considerations........................................6
5. IANA Considerations............................................6
6. References.....................................................6
6.1. Normative References......................................6
Authors' Addresses................................................8
1. Introduction
BGP Link State (BGP-LS) can be used to distribute link-state and
traffic engineering (TE) information to external components
[RFC7752]. [I-D.ietf-idr-bgp-ls-te-path] describes the mechanism for
BGP-LS to distribute the information of TE policies. [I-D.ietf-idr-
bgp-ls-sr-policy] describes the mechanism for BGP-LS to distribute
the information of SR policies.
In some network scenarios, the controller needs to obtain the
performance information of TE Policies, which can be used in service
placement to meet better customer requirements and utilize network
resources more efficiently.
This document describes a way to advertise the performance metrics
for Traffic Engineering (TE) Policy using BGP Link State (BGP-LS).
1.1. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
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2. Advertisement of TE Policy Performance Metric
[RFC8571] defines several Link Attribute TLVs for BGP-LS to carry
the IGP Traffic Engineering Performance Metric Extensions:
TLV Code Point Value
--------------------------------------------------------
1114 Unidirectional Link Delay
1115 Min/Max Unidirectional Link Delay
1116 Unidirectional Delay Variation
1117 Unidirectional Link Loss
1118 Unidirectional Residual Bandwidth
1119 Unidirectional Available Bandwidth
1120 Unidirectional Utilized Bandwidth
The above TLVs can be re-used to advertise the performance metrics
for TE Policies.
When used to describe the performance metric of the TE Policy NLRI,
they are carried in the optional non-transitive BGP Path Attribute
"BGP-LS Attribute" defined in [RFC7752]. The semantics of the above
TLVs comply with [RFC8571], except for that they are extended to
describe TE Policies besides IGP links.
The performance metric of TE Policy may be measured at the headend,
for example, by using TWAMP for SR Policy. But the measurement
methods are out of the scope of this document.
The existing performance metrics above are all unidirectional.
However, there are also requirements to advertise round-trip
performance metrics for TE Policies. The BGP-LS extensions for
round-trip TE performance metrics are defined in the following
section.
3. Extensions for Round-trip TE Performance Metric
3.1. Round-trip Delay TLV
This TLV advertises the average round-trip delay for TE Policy.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A| RESERVED | Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where:
o Type: TBD
o Length: 4
o Reserved: Reserved for future use. MUST be set to 0 when sent and
MUST be ignored when received.
o A: Anomalous (A) Bit. Same with the A Bit in Unidirectional Link
Delay TLV [RFC8571].
o Delay: Similar with the Delay filed in Unidirectional Link Delay
TLV [RFC8571], except for that the delay is round-trip.
3.2. Min/Max Round-trip Delay TLV
This TLV advertises the minimum and maximum round-trip delay for TE
Policy.
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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A| RESERVED | Min Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RESERVED | Max Delay |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where:
o Type: TBD
o Length: 4
o Reserved: Reserved for future use. MUST be set to 0 when sent and
MUST be ignored when received.
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o A: Anomalous (A) Bit. Same with the A Bit in Min/Max
Unidirectional Link Delay TLV [RFC8571].
o Min Delay: Similar with the Min Delay filed in Min/Max
Unidirectional Link Delay TLV [RFC8571], except for that the
delay is round-trip.
o Max Delay: Similar with the Max Delay filed in Min/Max
Unidirectional Link Delay TLV [RFC8571], except for that the
delay is round-trip.
3.3. Round-trip Delay Variation TLV
This TLV advertises the average round-trip delay variation for TE
Policy.
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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A| RESERVED | Delay Variation |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where:
o Type: TBD
o Length: 4
o Reserved: Reserved for future use. MUST be set to 0 when sent and
MUST be ignored when received.
o A: Anomalous (A) Bit. Same with the A Bit in Unidirectional Delay
Variation TLV [RFC8571].
o Delay Variation: Similar with the Delay Variation filed in
Unidirectional Delay Variation TLV [RFC8571], except for that the
delay variation is round-trip.
3.4. Round-trip Loss TLV
This TLV advertises the round-trip loss for TE Policy.
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|A| RESERVED | Loss |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
where:
o Type: TBD
o Length: 4
o Reserved: Reserved for future use. MUST be set to 0 when sent and
MUST be ignored when received.
o A: Anomalous (A) Bit. Same with the A Bit in Unidirectional Link
Loss TLV [RFC8571].
o Loss: Similar with the Link Loss filed in Unidirectional Link
Loss TLV [RFC8571], except for that the loss is round-trip.
4. Security Considerations
This document does not introduce additional security issues than
those described in [RFC7752], [I-D.ietf-idr-bgp-ls-te-path] and [I-
D.ietf-idr-bgp-ls-sr-policy].
5. IANA Considerations
This document defines the following TLVs for BGP-LS.
TLV Code Point Value
--------------------------------------------------------
TBD Round-trip Delay
TBD Min/Max Round-trip Delay
TBD Round-trip Variation
TBD Round-trip Loss
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.
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[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, May 2017
[RFC7752] Gredler, H., Ed., Medved, J., Previdi, S., Farrel, A., and
S. Ray, "North-Bound Distribution of Link-State and
Traffic Engineering (TE) Information Using BGP", RFC 7752,
DOI 10.17487/RFC7752, March 2016, <https://www.rfc-
editor.org/info/rfc7752>.
[RFC8571] Ginsberg, L., Ed., Previdi, S., Wu, Q., Tantsura, J., and
C. Filsfils, "BGP - Link State (BGP-LS) Advertisement of
IGP Traffic Engineering Performance Metric Extensions",
RFC 8571, DOI 10.17487/RFC8571, March 2019,
<https://www.rfc-editor.org/info/rfc8571>.
[I-D.ietf-idr-bgp-ls-te-path] Previdi, S., Talaulikar, K., Dong, J.,
Gredler, H., and J. Tantsura, "Advertisement of Traffic
Engineering Paths using BGP Link-State", Work in Progress,
Internet-Draft, draft-ietf-idr-bgp-ls-te-path-01,
September 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-
ls-te-path-01>.
[I-D.ietf-idr-bgp-ls-sr-policy] Previdi, S., Talaulikar, K., Dong,
J., Gredler, H., and J. Tantsura, "Advertisement of
Segment Routing Policies using BGP Link-State", Work in
Progress, Internet-Draft, draft-ietf-idr-bgp-ls-sr-policy-
03, November 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-
ls-sr-policy-03>.
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Authors' Addresses
Changwang Lin
New H3C Technologies
Email: linchangwang.04414@h3c.com
Mengxiao Chen
New H3C Technologies
Email: chen.mengxiao@h3c.com
Hao Li
New H3C Technologies
Email: lihao@h3c.com
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