On an IPv6 network, intermediate forwarding devices do not fragment IPv6 packets for the purpose of reducing their packet processing pressure. Packets are fragmented only on the source node.
InIPv6, fragmentation is handledonly at the source node. Intermediate routersdo not fragment packets. Instead, if a packet is too large for the next link, the router sends back anICMPv6 Packet Too Bigmessage to the source, which then adjusts its packet size.
This design:
Reduces processing load on intermediate devices.
Supports Path MTU Discovery (PMTUD).
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
“In IPv6, routers do not perform fragmentation. Only the source device fragments packets if needed, based on ICMPv6 feedback.”
(Chapter: IPv6 Fundamentals – Section: Fragmentation and PMTUD)
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