Internet DRAFT - draft-wang-idr-bgp-ls-ifit-node-capability
draft-wang-idr-bgp-ls-ifit-node-capability
Interdomain Routing Working Group Y. Wang
Internet-Draft T. Zhou
Intended status: Standards Track Huawei
Expires: September 14, 2020 R. Pang
China Unicom
March 13, 2020
Extensions to BGP-LS for Advertising In-situ Flow Information Telemetry
(IFIT) Node Capability
draft-wang-idr-bgp-ls-ifit-node-capability-03
Abstract
This document defines a way for a Border Gateway Protocol Link-State
(BGP-LS) speaker to announce In-situ Flow Information Telemetry
(IFIT) node capabilities of routers to BGP-LS consumer (e.g. a
centralized controller). In this document, IFIT Node Capability TLV
is defined as a new Node Attribute TLV that is encoded in the BGP-LS
attribute with Node NLRIs [RFC7752]. Such advertisements enable a
centralized controller that can leverage this information in
determining whether a particular IFIT Option type can be supported in
a given network.
Requirements Language
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].
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on September 14, 2020.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. IFIT Domain . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. IFIT Node Capability Information . . . . . . . . . . . . 3
3. Advertisement of the IFIT Node Capabilities via BGP-LS . . . 4
3.1. IFIT Node Capability TLV . . . . . . . . . . . . . . . . 4
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
4.1. TLV Code Point of the new IFIT Node Capability TLV within
Node NLRIs . . . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.1. Normative References . . . . . . . . . . . . . . . . . . 6
7.2. Informative References . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
IFIT provides a complete framework architecture and a reflection-loop
working solution for on-path flow telemetry
[I-D.song-opsawg-ifit-framework]. At present, there are a family of
emerging on-path flow telemetry techniques, including In-situ OAM
(IOAM) [I-D.ietf-ippm-ioam-data], PBT
[I-D.song-ippm-postcard-based-telemetry], IOAM Direct Export (DEX)
[I-D.ioamteam-ippm-ioam-direct-export], Enhanced Alternate Marking
(EAM) [I-D.zhou-ippm-enhanced-alternate-marking], etc. IFIT is a
solution focusing on network domains. The "network domain" consists
of a set of network devices or entities within a single
administration. One network domain MAY consists of multiple IFIT
domain. The family of emerging on-path flow telemetry techniques MAY
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be selectively or partially implemented in different vendors' devices
as an emerging feature for various use cases of application-aware
network operations. Within the IFIT domain, one or more IFIT-options
are added into packet at the IFIT-enabled head node that is referred
to as the IFIT encapsulating node. Then IFIT data fields MAY be
updated by IFIT transit nodes that the packet traverses. Finally,
the data fields are removed at a device that is referred to as the
IFIT decapsulating node. Hence, a centralized controller need to
know if routers are able to support the IFIT capabilities. BGP-LS
defines a way to advertise topology and associated attributes and
capabilities of the nodes in that topology to a centralized
controller [RFC7752]. Therefore, this document defines extensions to
BGP-LS to advertise the IFIT node capabilities to a centralized
controller that can learn the IFIT node capability to determine
whether a particular IFIT Option type can be supported in a given
network.
1.1. Terminology
BGP-LS: Advertisement of Link-State and TE Information using Border
Gateway Protocol
2. Concepts
2.1. IFIT Domain
IFIT is expected to be deployed in a specific domain referred as the
IFIT domain. An IFIT domain MAY cross multiple network domains. One
network domain MAY consists of multiple IFIT domain. Within the IFIT
domain, the IFIT data fields of flow information head MAY be updated
by network nodes that the packet traverses.
2.2. IFIT Node Capability Information
Each IFIT node is configured with a node-id which uniquely identifies
a node within the associated IFIT domain. To accommodate the
different use cases or requirements of in-situ flow information
telemetry, IFIT data fields updated by network nodes fall into
different categories which are referred as different IFIT option
types, including IOAM Trace Option-Types [I-D.ietf-ippm-ioam-data],
IOAM Edge-to-Edge (E2E) Option-Type [I-D.ietf-ippm-ioam-data], IOAM
DEX Option-Type [I-D.ioamteam-ippm-ioam-direct-export] and Enhanced
Alternate Marking (EAM) Option-Type
[I-D.zhou-ippm-enhanced-alternate-marking]. So IFIT Option Types
SHOULD be carried in IFIT node capability advertisment.
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3. Advertisement of the IFIT Node Capabilities via BGP-LS
This document describes extensions enabling BGP-LS speakers to
announce the IFIT node capabilities of routers in a network to a BGP-
LS consumer (e.g. a centralized controller). The centralized
controller can leverage this information in enabling IFIT
applications in network domains based on IFIT node capabilities and
OAM use cases.
3.1. IFIT Node Capability TLV
IFIT Node-Capability TLV is defined as a new Node Attribute TLV that
is encoded in the BGP-LS attribute with Node NLRIs [RFC7752]. The
IFIT Node Capability TLV is defined as a TLV triplet, i.e. a two-
octet Type field, a two-octet Length field, and four-octet Value
field. The Type field indicates the type of items in the Value
field. The Length field indicates the length of the Value field in
octets. The Value field indicates the IFIT Node Capability, which is
a 4-octet IFIT Option Type-enabled Flag bitmask.
The IFIT Node Capability TLV has the following format:
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 |
+---------------------------------------------------------------+
| IFIT Option Type-enabled Flag |
+---------------------------------------------------------------+
Fig. 1 IFIT Node Capability TLV Format
Type: To be assigned by IANA
Length: A 2-octet field that indicates the length of the value.
IFIT Option Type-enabled Flag: A 4-octet field, which is defined as
following:
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
+---------------------------------------------------------------+
|p|i|d|e|m| Reserved |
+---------------------------------------------------------------+
Where:
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p-Flag: IOAM Pre-allocated Trace Option Type-enabled flag. If bit p
is set (1), the router is capable of IOAM Pre-allocated Trace
[I-D.ietf-ippm-ioam-data].
i-Flag: IOAM Incremental Trace Option Type-enabled flag. If bit i is
set (1), the router is capable of IOAM Incremental Tracing
[I-D.ietf-ippm-ioam-data].
d-Flag: IOAM DEX Option Type-enabled flag. If bit d is set (1), the
router is capable of IOAM DEX [I-D.ioamteam-ippm-ioam-direct-export].
e-Flag: IOAM E2E Option Type-enabled flag. If bit e is set (1), the
router is capable of IOAM E2E processing [I-D.ietf-ippm-ioam-data].
m-Flag: Enhanced Alternative Marking enabled flag. If bit m is set
(1), then the router is capable of processing Enhanced Alternative
Marking packets [I-D.zhou-ippm-enhanced-alternate-marking].
Reserved: Must be set to zero upon transmission and ignored upon
receipt.
An IFIT node SHALL be capable of more than one IFIT option types. So
in this case, IFIT Option Type-enabled Flag bitmap SHOULD has more
than one bit being set.
4. IANA Considerations
4.1. TLV Code Point of the new IFIT Node Capability TLV within Node
NLRIs
This document makes the following registrations for a Node Attribute
TLV code point for the IFIT Node Capability TLV included with Node
NLRIs.
+------------+----------------------+
| Code Point | Description |
+------------+----------------------+
| TBD | IFIT Node Capability |
+------------+----------------------+
5. Security Considerations
This document introduces new Node Attribute TLVs for the existing
Node NLRIs. It does not introduce any new security risks to BGP-LS.
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6. Acknowledgements
7. References
7.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC7752] "North-Bound Distribution of Link-State and Traffic
Engineering (TE) Information Using BGP",
<https://datatracker.ietf.org/doc/rfc7752/>.
7.2. Informative References
[I-D.ietf-ippm-ioam-data]
"Data Fields for In-situ OAM".
[I-D.ioamteam-ippm-ioam-direct-export]
"In-situ OAM Direct Exporting",
<https://datatracker.ietf.org/doc/draft-ioamteam-ippm-
ioam-direct-export/>.
[I-D.song-ippm-postcard-based-telemetry]
"Postcard-based On-Path Flow Data Telemetry",
<https://datatracker.ietf.org/doc/draft-song-ippm-
postcard-based-telemetry/>.
[I-D.song-opsawg-ifit-framework]
"In-situ Flow Information Telemetry Framework",
<https://datatracker.ietf.org/doc/draft-song-opsawg-ifit-
framework/>.
[I-D.zhou-ippm-enhanced-alternate-marking]
"Enhanced Alternate Marking Method",
<https://datatracker.ietf.org/doc/draft-zhou-ippm-
enhanced-alternate-marking/>.
Authors' Addresses
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Yali Wang
Huawei
156 Beiqing Rd., Haidian District
Beijing
China
Email: wangyali11@huawei.com
Tianran Zhou
Huawei
156 Beiqing Rd., Haidian District
Beijing
China
Email: zhoutianran@huawei.com
Ran Pang
China Unicom
9 Shouti South Rd., Haidian District
Beijing
China
Email: pangran@chinaunicom.cn
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