isoftwire-7----Page:20
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Why move to L2TPv3? (Cont.) Cons of L2TPv2 as compared to L2TPv3: L2TPv2 Data Encapsulation PPP over L2TPv2 over UDP – 20 Bytes L2TPv3 allows further encapsulation optimization by offering the option to run over IP (instead of mandating UDP) and to tunnel IP frames without PPP UDP (8 bytes) Flags & Ver Len (opt) Tunnel Id Session Id PPP PId & 0xFF03 IPv4 / IPv6 Payload Sequencing disabled Length field present |