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Allowed sub-TLV types
Use of TLVs is optional
Encapsulation: sub-TLV type = 1
IPsec definition: SPI
(Payload) Protocol type: sub-TLV type = 2
IPsec definition: from encaps-safi
No-label: sub-TLV type = 3
Alternate address: sub-TLV type = 4
PPT Version