aii types for aggregation draft metz aii aggregate 01 txt
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Chris Metz, [email protected] Luca Martini, [email protected] Florin Balus, [email protected] Jeff Sugimoto, [email protected] Vacouver IETF Nov. 2005. AII Types for Aggregation draft-metz-aii-aggregate-01.txt. Changes from -00. Added PWid AII Type (Type 1)

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changes from 00
Changes from -00
  • Added PWid AII Type (Type 1)
    • compatibility with L2VPN signaling draft
    • FEC129 signaling support of attachment circuits provisioned with 32-bit identifier (i.e. PWid from FEC128)
  • Short and Long Prefix AII Type fields adjustments:
    • Global ID is 6 bytes in length (big enough to accommodate 2 and 4 octet ASN or IPv6 /48 as global identifiers)
    • flags field removed
  • Removed aggregation examples
  • Streamlined text
pwid aii type type 1
PWid AII Type (Type 1)

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

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

| AII Type=01 | Length | PWid |

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

| PWid (contd.) |

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

  • Used where provisioning model required fixed-length 32-bit AII value
    • draft-ietf-l2vpn-signaling-06.txt
    • FEC129 signaling of older PWid-configured attachment circuits
    • section 2.1 of draft
short prefix aii type type 2
Short Prefix AII Type (Type 2)

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

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

| AII Type=02 | Length | Global ID |

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

| Global ID (contd.) |

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

| Prefix |

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

| AC ID |

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

  • Used where provisioning model (e.g. inter-domain VPWS) permits distribution of AII aggregates prior to PWE3 signaling
    • reduced scaling burden on AII distribution mechanisms (e.g. MP-BGP) and PE memory
    • section 2.2 of draft
long prefix aii type type 3
Long Prefix AII Type (Type 3)

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

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

| AII Type=03 | Length | Global ID |

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

| Global ID (contd.) |

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

| |

| |

| |

| Prefix |

| |

| |

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

  • Same use as Short Prefix except:
    • larger prefix field (256 bits vs 32 bits); no AC ID
    • offers greater numbering flexibility given larger prefix field
    • section 2.3 of draft
next steps
Next Steps
  • Synced up with L2VPN signaling and dynamic MS-PW placement drafts
  • We need PWid AII Type for sure
  • … and we need Prefix-based AII Types (Short, Long or both)
  • Adopt as PWE3 WG document
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