BMP Route Change Statistics Based on Routing Policy

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Table of Contents

1. Introduction

[RFC7854] and [RFC8671] defines different BMP statistics, and [I-D.ietf-grow-bmp-bgp-rib-stats] extends these BMP statistics to provide more insights into the BGP RIBs.¶

Routing Policy are widely used in BGP to modify route attributes. Monitoring which route attributes are modified and how often can provide valuable insights for network operators.¶

This document defines few BMP statistics to report such route modifications in a generic and address-family-independent manner. The format of the BMP statistics message remains same as defined in [RFC7854]. Besides address family and gauge in the Stat Data (value) [RFC7854], these statistics also provide attribute types of route changes. This route attribute could be the BGP path attributes [RFC4271] or additional route attributes for Qos and forwarding-related parameters.¶

2. Motivation and Use Cases

The ability to track route modifications via Routing Policy enables operators to understand policy impact, detect misconfigurations, and analyze routing behavior. The attribute type and gauge allow external collectors to derive distribution insights.¶

3. Per-Peer Reporting

The BMP peer statistics report message is reported per BGP peer. Therefore, each route attribute modification count is associated with a specific peer, enabling peer-level policy analysis.¶

For locally originated routes applying routing policy, the peer is regarded as the local router itself, per Section 8.2 of [RFC7854].¶

4. Route Change Statistics based on Routing 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|          2-byte AFI           |  1-byte SAFI  |  1-byte NUM   |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 16-bit Attribute Type (first) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                     64-bit Gauge (first)                      |
|                                                               ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~ 16-bit Attribute Type (last)  ~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
~                     64-bit Gauge (last)                       ~
~                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

5. Security Considerations

Procedures and protocol extensions defined in this document do not affect the BMP security model. All security and authentication mechanisms required by Section 11 of [RFC7854], and Section 8 of [RFC8671] are also applicable to the gauges defined in this document. This document does not add any additional security considerations.¶

6. IANA Considerations

IANA has assigned the following new parameters in the BMP Statistics Types registry, part of the BMP parameters registry group.¶

This document requests IANA to update these entries as follows. Also, the document requests IANA to update the reference cited for the entries.¶

• Type = TBD_01: Number of routes with specific change attribute in per-AFI/SAFI post-policy Adj-RIB-In due to the application of inbound policy.¶

• Type = TBD_02: Number of routes with specific change attribute in per-AFI/SAFI post-policy Adj-RIB-Out due to the application of outbound policy.¶

Authors' Addresses