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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