RFC 2909 The MASC Protocol September 2000 Table of Contents 1 Introduction .................................................. 4 1.1 Terminology ................................................. 4 1.2 Definitions ................................................. 4 2 Requirements for Inter-Domain Address Allocation .............. 5 3 Overall Architecture .......................................... 5 3.1 Claim-Collide vs. Query-Response Rationale .................. 6 4 MASC Topology ................................................. 6 4.1 Managed vs Locally-Allocated Space .......................... 8 4.2 Prefix Lifetime ............................................. 8 4.3 Active vs. Deprecated Prefixes .............................. 9 4.4 Multi-Parent Sibling-to-Sibling and Internal Peering ........ 9 4.5 Administratively-Scoped Address Allocation .................. 9 5 Protocol Details .............................................. 10 5.1 Claiming Space .............................................. 10 5.1.1 Claim Comparison Function ................................. 12 5.2 Renewing an Existing Claim .................................. 12 5.3 Expanding an Existing Prefix ................................ 12 5.4 Releasing Allocated Space ................................... 13 6 Constants ..................................................... 13 7 Message Formats ............................................... 14 7.1 Message Header Format ....................................... 14 7.2 OPEN Message Format ......................................... 15 7.3 UPDATE Message Format ....................................... 17 7.4 KEEPALIVE Message Format .................................... 21 7.5 NOTIFICATION Message Format ................................. 21 8 MASC Error Handling ........................................... 24 8.1 Message Header Error Handling ............................... 24 8.2 OPEN Message Error Handling ................................. 25 8.3 UPDATE Message Error Handling ............................... 26 8.4 Hold Timer Expired Error Handling ........................... 28 8.5 Finite State Machine Error Handling ......................... 28 8.6 NOTIFICATION Message Error Handling ......................... 28 8.7 Cease ....................................................... 29 8.8 Connection Collision Detection .............................. 29 9 MASC Version Negotiation ...................................... 30 10 MASC Finite State Machine .................................... 30 10.1 Open/Close MASC Connection FSM ............................. 31 11 UPDATE Message Processing .................................... 35 11.1 Accept/Reject an UPDATE .................................... 36 11.2 PREFIX_IN_USE Message Processing ........................... 38 11.2.1 PREFIX_IN_USE by PARENT .................................. 38 11.2.2 PREFIX_IN_USE by SIBLING ................................. 38 11.2.3 PREFIX_IN_USE by CHILD ................................... 38 11.2.4 PREFIX_IN_USE by INTERNAL_PEER ........................... 38 11.3 CLAIM_DENIED Message Processing ............................ 39 11.3.1 CLAIM_DENIED by CHILD or SIBLING ......................... 39 Radoslavov, et al. Experimental