AII Types for Aggregation draft-metz-aii-aggregate-01.txt

1
AII Types for Aggregationdraft-metz-aii-aggregate
-01.txt

• Chris Metz, chmetz_at_cisco.com
• Luca Martini, lmartini_at_cisco.com
• Florin Balus, balus_at_nortel.com
• Jeff Sugimoto, sugimoto_at_nortel.com
• Vacouver IETF
• Nov. 2005

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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

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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 Type01 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

4
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 Type02 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

5
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 Type03 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

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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