Restrictions for 6VPE
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Inter-AS and carrier supporting carrier (CSC) is not supported.
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VRF Route-Leaking is not supported.
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eBGP as CE-PE is not supported.
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EIGRP, OSPFv3, RIP, ISIS, Static Routes are supported as CE-PE.
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MPLS Label Allocation modes supported are Per-VRF and Per-Prefix. Per-Prefix is the default mode.
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Cisco Catalyst 9600 Series Supervisor 2 Module only supports the per-VRF MPLS label allocation mode for local label allocation. This is also the default mode. However, Cisco Catalyst 9600 Series Supervisor 2 Module can interoperate with remote peers operating in the per-prefix mode.
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IP fragmentation is not supported in the Per-Prefix mode of Layer 3 VPN.
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DHCPv6 is not supported on a 6VPE topology with per-port trust enabled.