Large BGP Community draft-heitz-idr-large-community-00 Jakob Heitz - PowerPoint PPT Presentation

Large BGP Community draft-heitz-idr-large-community-00 Jakob Heitz (Cisco) Keyur Patel (Cisco) Job Snijders (NTT) Ignas Bagodnas (Equinix) IETF 96, July 2016 Berlin 1 draft-heitz-idr-large-community-01

Benefits • Today’s RFC1997 communities are 4 octets each. 2 for ASN and 2 to indicate the action. • With 4 octets for the ASN, it is mapped one to one to your actual globally unique assigned ASN. Clean name space! No more 23456. • With 8 octets for the action, you can easily create opaque action code points: you have room for a “target” and an “action” Examples: • “2914:199036:303” (In NTT: prepend 3 times to 32-bit AS 199036) • ( currently not possible with NTT’s standard BGP Communities) • ”2914:65535:3000” (In NTT: lower local preference in region X) • Currently done by putting private ASNs in the Global Administrator Field ( 65530:3000 ) – potential for clashes 2 draft-heitz-idr-large-community-01

Format • Each community is 8 octets long. • They are grouped by context ASN under a header inside a wide community BGP attribute. 3 draft-heitz-idr-large-community-01

Encoding 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 | This header from : Context ASN : Wide Communities +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Opaque 1 | Length determines how | Opaque 2 | many communities +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Opaque 1 | | Opaque 2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : more Opaque, as determined by Length : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 4 draft-heitz-idr-large-community-01

Textual Representation • Each community is represented as a:b:c • a, b and c are each a non-negative decimal integer • a – ASN • b – Opaque 1 • c – Opaque 2 5 draft-heitz-idr-large-community-01

Example • (2914:1:2), (2914:3:4), (2914:5:6), (3356:7:8) 24 + 24 + Communities (1*8) (3*8) .. 48 2914 1 2 3 4 5 6 .. 32 3356 7 8 Type Context and ASN other fields 6 draft-heitz-idr-large-community-01

Thanks • Jeff Haas, Juniper • Jared Mauch, NTT • Igor Gashinsky, Yahoo! 7 draft-heitz-idr-large-community-01