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Cisco Bug: CSCun47619 - Dao: VXLAN - ARP request falls through quickly dropping RARP in vMotion

Last Modified

Aug 07, 2019

Products (3)

  • Cisco Nexus 1000V Switch for VMware vSphere
  • Cisco Nexus 1000V Switch
  • Cisco Application Virtual Switch

Known Affected Releases

4.2(1)SV2(2.1) 5.2(1)SV3(1.1)

Description (partial)

Symptom:
After a vMotion of a VM on a VXLAN segment sometimes but not always pings to the VM take more than 8seconds to respond.

Conditions:
Given two hypervisors with VTEPs in different subnets, the VEM will attempt to proxy-arp for VM's MAC on the decapsulated segment.  Although the upstream device may respond to the proxy-arp within msec the SFLISP has already concluded the arp cannot resolve.

The following SFLISP debug would be issued on the VEM.

Feb 27 10:07:03.731046   299740  0   1  16   Debug sf_lisp_repl_list_stage: Unable to resolve ARP for ltl:50, src_ip:ac100a01, vlan:10, resIp:ac101e01!! "
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