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Why Use PCE for VPNs?
PCE is applicable to limited topology visibility
This may be the case in VPNs
For example for CE-CE connectivity
Placement of LSP tunnels in a core network may be sensitive to the particular VPN
There may be policy about what network resources can be used to support a VPN
PEs will not be aware of general network usage by specific VPNs
Especially the ones they are not part of
PPT Version