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Cisco Bug: CSCta73070 - ME3750 not sendig ICMP Dest. Unreach. Fragmentation Needed and DF bit

Last Modified

Feb 22, 2014

Products (1)

  • Cisco Catalyst 3750 Metro Series Switches

Known Affected Releases

12.2SE

Description (partial)

Symptom:

ME3750 switch acting as MPLS PE or LER router does not send ICMP Destination Unreachable  messages "Fragmentation Needed and DF set" (Type 3 Code 4) when 1500B IP packet is dropped due to MTU exceeded caused by MPLS overhead on egress MPLS link.
Conditions:

1500B MTU limitation on ME3750 uplink to the rest of the  MPLS network.
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