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AII Types for Aggregation draft-metz-aii-aggregate-00.txt. Chris Metz, chmetz@cisco.com Luca Martini, lmartini@cisco.com Florin Balus, balus@nortel.com Jeff Sugimoto, sugimoto@nortel.com Paris IETF . Scenario. target PE set. source PE. Provisioning Model: Selective Inter-Domain VPWS

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aii types for aggregation draft metz aii aggregate 00 txt

AII Types for Aggregationdraft-metz-aii-aggregate-00.txt

Chris Metz, chmetz@cisco.com

Luca Martini, lmartini@cisco.com

Florin Balus, balus@nortel.com

Jeff Sugimoto, sugimoto@nortel.com

Paris IETF

scenario
Scenario

target PE

set

source PE

  • Provisioning Model: Selective Inter-Domain VPWS
    • provider triggers circuit (i.e. PW) signaling based on customer demand
    • PWE3 signaling must carry fully-qualified end-point identifier (i.e. TAI)

U-PE4

C4

AS #2

AS #1

C1

U-PE5

U-PE1

S-PE2

S-PE3

U-PE6

issues
Issues

Candidate Target AIIs

source PE

  • Scalability: distributing O(# of candidate target AIIs) will stress AII distribution (e.g. MP-BGP) machinery and PE memory
  • Security: source U-PE1 is prohibited from learning IP addresses of candidate target PE set. Implication: can’t route PWE3 setups based on target U-PE IP address

1. AII Distribution

U-PE4

AS #2

AS #1

U-PE5

U-PE1

S-PE2

S-PE3

U-PE6

2. Target PE

/32 loopbacks

what s needed
What’s Needed
  • Define new AII Type:
    • enables many discrete AIIs to be summarized into a single or few AII aggregates (note: PW routing based on AII aggregates is needed)
    • option for global uniqueness
    • AII numbering flexibility – based on IPv4, IPv6, NSAP or other circuit addressing scheme
    • conformant with PWE3 FEC129 signaling semantics
short prefix aii type
Short Prefix AII Type
  • Defined in Section 2.1 of draft
  • Multiple levels of aggregation possible (see draft for examples)
  • Affinity with IPv4
    • e.g. auto-generate discrete AII values from PE /32 loopback
  • Optional Attachment Circuit ID (AC ID) included to further refine identification of a particular attachment circuit

AC ID

Length

Prefix (32-bits)

AII Type = 01

Global ID

long prefix aii type
Long Prefix AII Type
  • Defined in Section 2.2 of draft
  • Hold longer prefixes (e.g. IPv6, NSAP or even IPv4)
    • e.g. useful if provider’s existing circuit-provisioning NMS uses NSAP addressing
  • AC ID not defined because there are enough bits in prefix field

Length

Prefix (256-bits)

AII Type = 02

Global ID

final comments
Final Comments
  • Selective VPWS provisioning model warrants AII aggregation for scalability
  • MS-PW is a signaling *AND* routing problem
    • when explicit paths not used or target U-PE address is not reachable, then PW routing must be based on something else
  • Next Steps:
    • Refinements: Use Route Distinguisher as Global ID? Both types needed?
    • Sync up with MS-PW signaling and routing efforts