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Why BRPC needs inter-AS links? Typical computation scenario for BRPC The traversed domains are assumed to be selected before path computation: AS1->AS2->AS3 Egress LSR Ingress LSR A1 C3 C2 A2 AS 1 AS 2 AS 3 B2 A3 B4 C1 B1 B3 PCE1 PCE2 PCE3 PCE3 and PCE2 need to select entry boundary nodes based on their upstream AS number respectively. PCE2 and PCE1 need to select exit boundary nodes that provide connections to their downstream AS respectively. IETF 69#, CCAMP WG Chicago 07/25/2007 PS: |