EVPN-Specific BMP RIB Statistics Extensions
draft-saum-grow-bmp-afi-safi-evpn-06
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| Document | Type | Active Internet-Draft (individual) | |
|---|---|---|---|
| Authors | Saumya Dikshit , Mukul Kumar Srivastava , Changwang Lin | ||
| Last updated | 2026-07-24 | ||
| RFC stream | (None) | ||
| Intended RFC status | (None) | ||
| Formats | |||
| Stream | Stream state | (No stream defined) | |
| Consensus boilerplate | Unknown | ||
| RFC Editor Note | (None) | ||
| IESG | IESG state | I-D Exists | |
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draft-saum-grow-bmp-afi-safi-evpn-06
Network Working Group S. Dikshit
Internet-Draft Aruba Networks, HPE
Intended status: Standards Track M. Srivastava
Expires: 25 January 2027 Hewlett Packard Enterprise
C. Lin
New H3C Technologies
25 July 2026
EVPN-Specific BMP RIB Statistics Extensions
draft-saum-grow-bmp-afi-safi-evpn-06
Abstract
This document defines new EVPN-specific BGP Monitoring Protocol
(BMP) statistics types. These extensions include scalar counters
for EVPN route types specifically, while also keeping scope for
defining counters which are EVPN route-type agnostic but related to
BGP-EVPN RIB like, number of multihoming Ethernet Segments, number
of multihomed EVIs, number of aliased paths, number of dynamic
inter-VRF route leaking (IVRL).
This revision (-06) firms up the specification for working group
consideration: it adds a Relationship to Other Work section that
explicitly maps this document to concurrently circulating GROW
contributions on BMP statistics and TLV extensions and invites
coordination with their authors, corrects the YANG alignment
reference, strengthens Security Considerations, and adds a worked
example. No statistics semantics, Stat Type/Subtype allocations, or
wire formats defined in -05 are changed.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on 25 January 2027.
Copyright Notice
Copyright (c) 2026 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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described in the Revised BSD License.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. EVPN-Specific BMP Statistics Extensions . . . . . . . . . . 3
2.1. Global EVPN Route Statistics . . . . . . . . . . . . . . 3
2.1.1. Statistics Definitions . . . . . . . . . . . . . . . 3
2.1.2. Statistics Format . . . . . . . . . . . . . . . . . . 4
2.2. Per-EVI EVPN Route Statistics . . . . . . . . . . . . . 5
2.2.1. Statistics Definitions . . . . . . . . . . . . . . . 5
2.2.2. Statistics Format . . . . . . . . . . . . . . . . . . 5
2.3. Worked Example . . . . . . . . . . . . . . . . . . . . . 6
3. Relationship to Other Work and Call for Collaboration . . . 6
4. YANG Model Alignment . . . . . . . . . . . . . . . . . . . . 8
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
6. Security Considerations . . . . . . . . . . . . . . . . . . . 9
7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 9
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
9.1. Normative References . . . . . . . . . . . . . . . . . . 10
9.2. Informative References . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
[RFC7854] defines different BMP statistics message types and
[RFC9972] extends the BMP statistics to provide more insights into
the BGP RIBs. This document extends the BMP RIB statistics by
adding EVPN-specific statistics types to monitor EVPN-related
events in Adj-RIB-In, Adj-RIB-Out, and Local-RIB for the EVPN
address family (AFI=25, SAFI=70) as defined in [RFC7432] and
extended by [RFC9135] for integrated routing and bridging, forms
the basis for these statistics.
The format of the BMP statistics message remains same as defined in
[RFC7854].
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.
2. EVPN-Specific BMP Statistics Extensions
This section defines EVPN-specific statistics types for BMP,
applicable to the EVPN address family (AFI=25, SAFI=70). These
statistics type for all 5 RIB views: Adj-RIB-In-Pre,
Adj-RIB-In-Post, Local-RIB, Adj-RIB-Out-Pre and Adj-RIB-Out-Pre.
and to define more specific counters other than the route-types in
future.
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2.1. Global EVPN Route Statistics
The section defines global EVPN route or other information
statistics, e.g., the overall Ethernet Auto-discovery Route
counters.
2.1.1. Statistics Definitions
This section defines different statistics type for global EVPN
monitoring type.
* Type=TBD_01: Statistics for global EVPN routes received in
Adj-RIB-In before inbound policy is applied.
* Type=TBD_02: Statistics for global EVPN routes in Adj-RIB-In
after inbound policy is applied.
* Type=TBD_03: Statistics for global EVPN routes in the local RIB.
* Type=TBD_04: Statistics for global EVPN routes in Adj-RIB-Out
before outbound policy is applied.
* Type=TBD_05: Statistics for global EVPN routes in Adj-RIB-Out
after outbound policy is applied.
* Type=TBD_06: Statistics for global EVPN information of
ESs/EVIs/aliased paths.
2.1.2. Statistics Format
The statistics values are encoded as 1-octet Stats types, 1-octet
Stats Subtype followed by 64-bit gauges. The statistics values are
encoded in Stat Data as defined in 4.8 of [RFC7854]. Each counter
is encoded as follows:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Stats Type | Stats Subtype | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
| Gauge (64 bits) |
~ ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* Stats Type (1 octet): EVPN stats type. Defined types are:
- Type = 0: EVPN route statistics in the RIB.
- Type = 1: EVPN leaked route statistics in the local RIB.
- Type = 2: EVPN multihoming Ethernet Segments (ESs)
statistics.
- Type = 3: EVPN multihomed EVPN instances (EVIs) statistics.
- Type = 4: EVPN aliased paths statistics.
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* Stats Subtype (1 octet): Indicates the EVPN route type
associated with this statistic, as defined in:
- Subtype = 0: Reserved.
- Subtype = 1: EVPN route type 1 (Ethernet Auto-discovery).
- Subtype = 2: EVPN route type 2 (MAC/IP Advertisement).
- Subtype = 3: EVPN route type 3 (Inclusive Multicast Ethernet
Tag Route).
- Subtype = 4: EVPN route type 4 (Ethernet Segment Route).
- Subtype = 5: EVPN route type 5 (IP Prefix Route).
- Subtype = 6: EVPN route type 6 (Selective Multicast Ethernet
Tag Route).
- Subtype = 7: EVPN route type 7 (IGMP Join Synchronization
Route).
- Subtype = 8: EVPN route type 8 (IGMP Leave Synchronization
Route).
- Subtype = 9: EVPN route type 9 (Per-Region I-PMSI A-D
route).
- Subtype = 10: EVPN route type 10 (S-PMSI A-D route).
- Subtype = 11: EVPN route type 11 (Leaf A-D route).
Stats Subtype is only used when Stats Type is set to 0 and 1;
otherwise, Stats Subtype is omitted. A BMP implementation MUST
ignore unrecognized stat types on receipt, and likewise MUST ignore
unexpected data in the Stat Data field.
2.2. Per-EVI EVPN Route Statistics
The section defines specific EVI EVPN route statistics, e.g.,
per-EVI IP Prefix Route counters.
2.2.1. Statistics Definitions
This section defines different statistics type for per-EVI EVPN
monitoring type.
* Type=TBD_07: Statistics for per-EVI EVPN routes received in
Adj-RIB-In before inbound policy is applied.
* Type=TBD_08: Statistics for per-EVI EVPN routes in Adj-RIB-In
after inbound policy is applied.
* Type=TBD_09: Statistics for per-EVI EVPN routes in the local
RIB.
* Type=TBD_10: Statistics for per-EVI EVPN routes in Adj-RIB-Out
before outbound policy is applied.
* Type=TBD_11: Statistics for per-EVI EVPN routes in Adj-RIB-Out
after outbound policy is applied.
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2.2.2. Statistics Format
The statistics values are encoded as 1-octet Stats types, 1-octet
Stats Subtype, and 8-octet Route Distinguisher (RD) followed by
64-bit gauges. The statistics values are encoded in Stat Data as
defined in 4.8 of [RFC7854]. Each counter is encoded as follows:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Stats Type | Stats Subtype | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
| Route Distinguisher (RD) |
| (8 octets) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Gauge (64 bits) |
~ ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* Stats Type (1 octet): EVPN stats type, as defined in
Section 2.1.2.
* Stats Subtype (1 octet): Indicates the EVPN route type
associated with this statistic, as defined in Section 2.1.2.
* Route Distinguisher (RD) (8 octets): Indicates source EVI
associated with the EVPN route. The Route Distinguisher (RD)
field MUST be populated with the corresponding source EVI's RD
of the EVPN route.
2.3. Worked Example
This non-normative example illustrates a Statistics Report message
carrying a per-EVI IP Prefix Route counter (Section 2.2) for a PE
with EVI Route Distinguisher 65001:100, reporting 42 active EVPN
route type 5 prefixes in its Local-RIB:
Stats Type = TBD_09 (loc-rib-evpn-route-per-evi-stats)
Stats Subtype = 5 (EVPN route type 5, IP Prefix Route)
RD = 65001:100
Gauge = 42
A collector receiving this Stat Data, together with the per-EVI
Remote VRF Information carried by a companion mechanism such as
[I-D.zhuang-grow-bmp-enhancement-for-vrf-loc-rib] (see Section 3),
can attribute the 42 routes both to a count (this document) and,
where available, to the specific remote VRF/EVI instance they were
learned from (that document's TLV).
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3. Relationship to Other Work and Call for Collaboration
Several documents currently active in GROW define statistics or
TLV extensions to BMP that intersect with the scope of this
document. This section maps this document explicitly against that
work and records specific collaboration proposals; it does not
change the semantics or wire format of any statistic defined in
Section 2.
* [I-D.zhuang-grow-bmp-enhancement-for-vrf-loc-rib] defines a
Remote VRF Information TLV that lets a BMP Loc-RIB [RFC9069]
report identify the remote VRF/EVI a VPN route was learned
from. That document's Section 1 example is structurally
identical to the dynamic inter-VRF route leaking (IVRL)
scenario this document's Type=1 (EVPN leaked route statistics)
counter is intended to quantify: their TLV supplies the "from
which remote instance" topology detail, while our Type=1/Type=3
counters supply the "how many, and how often" volumetric
detail. Today, an operator has no single-document way to
correlate the two. We propose to the authors of that document
(S. Zhuang, N. Geng, H. Wang) that a joint follow-up either (a)
adds an EVPN-scoped counterpart to their Remote VRF Information
TLV referencing this document's per-EVI statistics types, or
(b) is captured by generalizing this document's per-EVI Stat
Data format, as outlined in
[I-D.dikshit-grow-bmp-rd-scoped-rib-stats]. We welcome
co-authorship or contributed text on this point.
* [I-D.wang-grow-bmp-bgp-rib-stats-ext] introduces a 4-bit Flags
field (Triggered/Differential bits) into the Stat Type TLV
header used for its fine-grained filtering statistics. The
per-EVI and global EVPN counters defined in Section 2 of this
document use the unmodified [RFC7854]/[RFC9972] Stat Data
layout and do not currently have an equivalent
triggered/differential reporting capability. Rather than this
document defining a second, incompatible flags convention, we
propose that the Flags field defined in
[I-D.wang-grow-bmp-bgp-rib-stats-ext] Section 2 be generalized
(in that document, or in a shared companion document) so that
EVPN statistics types defined here can also set the
Triggered/Differential bits when a future revision of this
document adopts them. We invite L. Wang, N. Geng, L. Li, and S.
Zhuang to discuss whether that flags octet should be lifted out
into its own short, reusable BMP Stat Type TLV extension
document that both efforts can reference.
* [I-D.ietf-grow-bmp-stats-informational-tlv], already adopted by
the GROW working group and co-authored by two of this document's
authors (M. Srivastava, C. Lin) together with S. Kolenchery,
defines a Statistics Information TLV carrying minimum, maximum,
average, and median values alongside a gauge. The per-EVI and
global EVPN gauges defined in Section 2 of this document are
directly applicable inputs to that TLV; implementations
reporting EVPN statistics SHOULD consider also applying
[I-D.ietf-grow-bmp-stats-informational-tlv] to smooth
short-term EVI-level churn (e.g., during mass Ethernet Segment
failover) for collector consumption.
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* [I-D.dikshit-grow-bmp-rd-scoped-rib-stats], authored by the same
authors as this document, proposes generalizing the Stat Data
format of Section 2.2 (Stats Type, Stats Subtype, 8-octet RD,
Gauge) into a family-agnostic "RD-Scoped Statistics" container
applicable beyond EVPN to L3VPN and MVPN. A future revision of
this document may adopt that container as the wire format for
Section 2.2, registering EVPN as Family=2 in that document's
registry, without changing any Stat Type allocation requested in
Section 5 of this document.
Authors of the documents referenced above are encouraged to bring
any of these coordination points to the GROW mailing list or to a
future GROW session so that Stat Type TLV conventions and registry
entries can be aligned before multiple, mutually incompatible
variants reach working group last call.
4. YANG Model Alignment
The counters defined in this document are intended to align with a
YANG model for EVPN monitoring. The -05 revision of this document
referenced [I-D.ietf-bess-evpn-yang-07] for that alignment; that
document has since expired (it was last updated in March 2019) and
SHOULD NOT be relied upon as a current reference. Route type
counters are intended to map to YANG leaves for EVPN route
statistics, multihoming and IVRL counters are intended to align
with Ethernet Segment and VRF-related leaves, and segment failure
impact is intended to align with failure event counters, but no
currently maintained EVPN YANG module implements these leaves.
Separately, [I-D.ietf-grow-bmp-yang], the active GROW working group
YANG model for BMP itself, does not yet model [RFC9972]'s advanced
statistics types or the EVPN-specific statistics types defined in
this document. The authors intend to propose a YANG augmentation
of [I-D.ietf-grow-bmp-yang] covering both, and, if
[I-D.dikshit-grow-bmp-rd-scoped-rib-stats] proceeds, to model that
document's generalized container instead of a one-off EVPN-specific
augmentation. Implementations SHOULD treat both YANG alignment
statements in this section as informative and subject to revision
as that augmentation work proceeds.
5. IANA Considerations
This document requests that IANA assign new BMP statistics types
from the "BMP Statistics Type" registry for the following:
* Type TBD_01: rib-in-pre-evpn-route-stats: Statistics for global
EVPN routes received before inbound policy is applied.
* Type TBD_02: rib-in-post-evpn-route-stats: Statistics for
global EVPN routes after inbound policy is applied.
* Type TBD_03: loc-rib-evpn-route-stats: Statistics for global
EVPN routes in the local RIB.
* Type TBD_04: rib-out-pre-evpn-route-stats: Statistics for
global EVPN routes before outbound policy is applied.
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* Type TBD_05: rib-out-post-evpn-route-stats: Statistics for
global EVPN routes after outbound policy is applied.
* Type TBD_06: rib-out-post-evpn-info-stats: Statistics for
global EVPN information of ESs/EVIs/aliased paths.
* Type TBD_07: rib-in-pre-evpn-route-per-evi-stats: Statistics
for per-EVI EVPN routes received before inbound policy is
applied.
* Type TBD_08: rib-in-post-evpn-route-per-evi-stats: Statistics
for per-EVI EVPN routes after inbound policy is applied.
* Type TBD_09: loc-rib-evpn-route-per-evi-stats: Statistics for
per-EVI EVPN routes in the local RIB.
* Type TBD_10: rib-out-pre-evpn-route-per-evi-stats: Statistics
for per-EVI EVPN routes before outbound policy is applied.
* Type TBD_11: rib-out-post-evpn-route-per-evi-stats: Statistics
for per-EVI EVPN routes after outbound policy is applied.
The 11 types are sufficient to provide generic monitoring of EVPN
route types across Adj-RIB-In, Adj-RIB-Out, and Local-RIB.
6. Security Considerations
The security considerations of [RFC7854] apply to this document.
The per-EVI statistics defined in Section 2.2 reveal, per Route
Distinguisher, the volume of EVPN routes, leaked routes, and
multihoming state associated with a specific EVI. Where an EVI
corresponds to a customer-facing tenant instance, this is
customer-instance-level operational detail comparable in
sensitivity to the remote-VRF topology information discussed in
the Security Considerations of
[I-D.zhuang-grow-bmp-enhancement-for-vrf-loc-rib]. As with that
document, implementations SHOULD restrict BMP session access to
authorized and trusted monitoring devices and SHOULD use transport
security (e.g., TCP-AO [RFC5925] or a TLS profile for BMP)
consistent with Section 11 of [RFC7854]. No new protocol
interactions beyond the BMP Statistics Report message defined in
[RFC7854] are introduced by this document.
7. Contributors
The following people made significant contributions to this
document:
To be added.
8. Acknowledgements
The authors would like to acknowledge the GROW working group and
the authors of the related documents cited in Section 3 for their
ongoing work in this space; specific review credit will be added
as discussion on the coordination points in Section 3 progresses.
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9. References
9.1. Normative References
[RFC7854] Scudder, J., Ed., Fernando, R., and S. Stuart, "BGP
Monitoring Protocol (BMP)", RFC 7854,
DOI 10.17487/RFC7854, June 2016,
<https://www.rfc-editor.org/info/rfc7854>.
[RFC7432] Sajassi, A., Aggarwal, R., Bitar, N., Isaac, A., Uttaro,
J., Drake, J., and W. Henderickx, "BGP MPLS-Based
Ethernet VPN", RFC 7432, DOI 10.17487/RFC7432,
February 2015, <https://www.rfc-editor.org/info/rfc7432>.
[RFC9135] Sajassi, A., Drake, J., Boutros, S., and J. Rabadan,
"Integrated Routing and Bridging in Ethernet VPN
(EVPN)", RFC 9135, DOI 10.17487/RFC9135, October 2021,
<https://www.rfc-editor.org/info/rfc9135>.
[RFC9972] Srivastava, M., Ed., Liu, Y., Lin, C., Ed., and J. Li,
"Advanced BGP Monitoring Protocol (BMP) Statistics
Types", RFC 9972, DOI 10.17487/RFC9972, May 2026,
<https://www.rfc-editor.org/info/rfc9972>.
[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>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC5925] Touch, J., Mankin, A., and R. Bonica, "The TCP
Authentication Option", RFC 5925, DOI 10.17487/RFC5925,
June 2010, <https://www.rfc-editor.org/info/rfc5925>.
9.2. Informative References
[I-D.ietf-bess-evpn-yang-07]
Brissette, P., Shah, H., Chen, I., and K. Patel, "Yang
Data Model for EVPN", Work in Progress, Internet-Draft,
draft-ietf-bess-evpn-yang-07, March 2019 (expired).
[I-D.ietf-grow-bmp-yang]
Work in Progress, Internet-Draft, draft-ietf-grow-bmp-
yang-09, 15 June 2026.
[I-D.ietf-grow-bmp-stats-informational-tlv]
Srivastava, M., Kolenchery, S., and C. Lin, "BMP
Statistics Information TLV", Work in Progress, Internet-
Draft, draft-ietf-grow-bmp-stats-informational-tlv-00,
12 May 2026.
[I-D.wang-grow-bmp-bgp-rib-stats-ext]
Wang, L., Geng, N., Li, L., and S. Zhuang, "BGP RIB
Fine-Grained Filtering Statistics Extensions for BGP
Monitoring Protocol (BMP)", Work in Progress, Internet-
Draft, draft-wang-grow-bmp-bgp-rib-stats-ext-01,
5 July 2026.
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[I-D.zhuang-grow-bmp-enhancement-for-vrf-loc-rib]
Zhuang, S., Geng, N., and H. Wang, "Enhancement for
Monitoring VRF's Loc-RIB", Work in Progress, Internet-
Draft, draft-zhuang-grow-bmp-enhancement-for-vrf-loc-
rib-01, 6 July 2026.
[I-D.dikshit-grow-bmp-rd-scoped-rib-stats]
Dikshit, S., Srivastava, M., and C. Lin,
"Route-Distinguisher-Scoped BMP RIB Statistics", Work in
Progress, Internet-Draft, draft-dikshit-grow-bmp-rd-
scoped-rib-stats-00, 25 July 2026.
Authors' Addresses
Saumya Dikshit
Aruba Networks, HPE
Mahadevpura
Bangalore 560 048
Karnataka
India
Email: saumya.dikshit@hpe.com
Mukul Srivastava
Hewlett Packard Enterprise
10 Technology Park Dr
Westford, MA 01886
United States of America
Email: mukul.srivastava@hpe.com
Changwang Lin
New H3C Technologies
8 Yongjia North Road
Beijing
Haidian District, 100094
China
Email: linchangwang.04414@h3c.com
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