draft-ietf-idr-large-community-10.txt   draft-ietf-idr-large-community-11.txt 
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Expires: June 5, 2017 NTT Expires: June 5, 2017 NTT
K. Patel K. Patel
Arrcus Arrcus
I. Bagdonas I. Bagdonas
Equinix Equinix
N. Hilliard N. Hilliard
INEX INEX
December 2, 2016 December 2, 2016
BGP Large Communities BGP Large Communities
draft-ietf-idr-large-community-10 draft-ietf-idr-large-community-11
Abstract Abstract
This document describes the BGP Large Communities attribute, an This document describes the BGP Large Communities attribute, an
extension to BGP-4. This attribute provides a mechanism to signal extension to BGP-4. This attribute provides a mechanism to signal
opaque information within separate namespaces to aid in routing opaque information within separate namespaces to aid in routing
management. The attribute is suitable for use with four-octet management. The attribute is suitable for use with four-octet
Autonomous System Numbers. Autonomous System Numbers.
Requirements Language Requirements Language
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Global Administrator: A four-octet namespace identifier. Global Administrator: A four-octet namespace identifier.
Local Data Part 1: A four-octet operator-defined value. Local Data Part 1: A four-octet operator-defined value.
Local Data Part 2: A four-octet operator-defined value. Local Data Part 2: A four-octet operator-defined value.
The Global Administrator field is intended to allow different The Global Administrator field is intended to allow different
Autonomous Systems to define BGP Large Communities without collision. Autonomous Systems to define BGP Large Communities without collision.
This field SHOULD be an Autonomous System Number (ASN). The use of This field SHOULD be an Autonomous System Number (ASN), in which case
Reserved ASNs (0 [RFC7607], 65535 and 4294967295 [RFC7300]) is NOT the Local Data Parts are to be interpreted as defined by the owner of
RECOMMENDED. the ASN. The use of Reserved ASNs (0 [RFC7607], 65535 and 4294967295
[RFC7300]) is NOT RECOMMENDED.
There is no significance to the order in which twelve-octet Large There is no significance to the order in which twelve-octet Large
Community Attribute values are encoded in a Large Communities Community Attribute values are encoded in a Large Communities
attribute, A BGP speaker can transmit them in any order. attribute, A BGP speaker can transmit them in any order.
Duplicate BGP Large Community values MUST NOT be transmitted. A Duplicate BGP Large Community values MUST NOT be transmitted. A
receiving speaker MUST silently remove redundant BGP Large Community receiving speaker MUST silently remove redundant BGP Large Community
values from a BGP Large Community attribute. values from a BGP Large Community attribute.
3. Aggregation 3. Aggregation
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