If fragmentation is needed for L3VPN, we simply take the payload (IP packet), we fragment it and forward it using the normal label (or label stack). This is a simple procedure and is based on existing standards.
For L2VPN on the other hand, we would need to start looking deeper in the payload to determined if the protocol transported by the L2 protocol is IP, fragment the IP packets, modify existing L2 header and create new ones. This procedure would be fairly complicated and is not standardized.
Harold Ritter Sr. Technical Leader CCIE 4168 (R&S, SP) firstname.lastname@example.org México móvil: +52 1 55 8312 4915 Cisco México Paseo de la Reforma 222 Piso 19 Cuauhtémoc, Juárez Ciudad de México, 06600 México
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