RFC 9072

Extended Optional Parameters Length for BGP OPEN Message, July 2021

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RFC 4271
E. Chen
J. Scudder
idr (rtg)

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DOI:  https://doi.org/10.17487/RFC9072

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The Optional Parameters in the BGP OPEN message as defined in the base BGP specification are limited to 255 octets due to a one-octet length field. BGP capabilities are carried in this field and may foreseeably exceed 255 octets in the future, leading to concerns about this limitation.

This document updates RFC 4271 by extending, in a backward-compatible manner, the length of the Optional Parameters in a BGP OPEN message. The Parameter Length field of individual Optional Parameters is also extended.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.

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