PPT Slide

Example – inter-area

• R1 in Area A requests a path setup (and record route) to node R6 in Area C.
  • first path traverses (R1,R2,ABR1,Rx, ABR3,R4,R6)

• R1 requests a second path setup to R6, specifying routes to exclude e.g. exclude (R2,ABR1,Rx,ABR3,R4)
  • second path traverses (R1,R3,ABR2,Ry,ABR4,R5,R6)

Note: This approach of setting up alternate paths would be less optimal then the route server approach in http://www.ietf.org/proceedings/00dec/slides/TEWG-6/sld010.htm (draft-lee-mpls-path-request-03.txt). If necessary, link diversity information may be specified to be recorded and excluded.

R1

ABR1

ABR2

ABR3

ABR4

R6

R2

R3

R4

R5

Area A

Area B

Area C

Rx

Ry

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