The packet is dropped and an ICMP destination unreachable (type 3) fragmentation needed and don't FDF was set (code 4) is sent back to the source IP address.
Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
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Cisco México
Paseo de la Reforma 222
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Cuauhtémoc, Juárez
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México