Current (Old) format boundaries

• Will change after recent discussions between the IETF & the RIRs

+--+-----+-----+---+-----+------+------------------+

| 3| 13 | 13 | 6 | 13 | 16 | 64 bits |

+--+-----+-----+---+-----+------+------------------+

|FP| TLA | sub |Res| NLA | SLA | Interface |

| | ID | TLA | | ID | ID | ID |

+--+-----+--+--+---+-----+------+------------------+

/23 /29 /35 /48 /64

<--- public topology -->

<-site->

<----Interface--->

(RFC 2374 - Mixes technology and policy)

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