Preview Tool

Cisco Bug: CSCum68846 - N3K: ICMP unreachable/TTL exceeded pkt has same src ip and dest ip

Last Modified

Jan 30, 2017

Products (2)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3548 Switch

Known Affected Releases


Description (partial)

Symptom:Traceroute to a Nexus3000/3500 fails, as the ICMP packet sent out by the switch has same source and destination IP address.

A host with IP address sends traceroute (UDP) to (configured in N3K).
The ICMP port-unreachable sent out by N3K has source and destination IP address of

Conditions:Nexus 3000/3500 running one of the affected releases.
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.