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Cisco Bug: CSCup42943 - DMAC 0000.0000.0000 loops endlessly between fabricpath peers

Last Modified

Nov 27, 2020

Products (8)

  • CiscoPro Workgroup EtherSwitch Software
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

6.2(6) 6.2(8)S2

Description (partial) 

Symptom:
In a mixed VDC M2/F2E running fabricpath, a frame with DMAC 0000.0000.0000 is looping endlessly between the fabricpath peers.

A mac flap can be seen between the GPC and peer SW.ID

This could increase the bandwidth utilizaiton on the link.

Conditions:
Issue seems to be seen in a M2/F2E chassis running fabricpath. This bug applies to 6.2(6) and 6.2(8) only.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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