VM loses network connectivity after vMotion in a Cisco ACI VMM integrated environment
Article ID: 444607
Updated On:
Products
Issue/Introduction
- The virtual machines are utilizing VLANs on a Distributed Virtual Switch (DVS) managed by a Cisco ACI VMM integration.
- After vMotion, VM loses network connectivity.
- A packet capture on VM switchport and ESXI host uplink for this VM shows that VM is not able to resolve the MAC address of it's default gateway or any other VMs due to the ARP reply packets not receiving from the leaf switch.
- vCenter shows low disk space warning
Environment
Vmware vSphere ESXI 8.0
vCenter 8.x
vCenter 9.x
Cause
In a VMware VMM-integrated Cisco ACI environment, vCenter is not in the data path for actual vMotion traffic (which travels directly between ESXi hosts). However, since Cisco ACI controller is leveraging the vSphere APIs, if vCenter goes unresponsive due to any reasons, it may affect the policy updates in underlay networking.
Resolution
Fix the issue associated with low disk space in vCenter and ensure vCenter is healthy and then monitor and see if it helps to resolve the network issue.
Refer KBs;
vCenter root partition filling up due to excessive logging in /var/mail/root file
Additional Information
Cisco ACI VMM integration is a partner integration that has no clear demarcation point. Due to the operational nature of this integration, Broadcom requires issues to be reproduced in an environment free of the partner component to confirm if the root cause lies within vSphere or NSX.
In cases where there is no clear demarcation line,* Broadcom will require the following two steps to troubleshoot or manage issues related to vSphere, NSX-T, or NSX environments. Broadcom will request the creation of an environment free of the partner component in question** for troubleshooting purposes.
- If the issue is reproducible without the partner component, Broadcom will support and investigate as normal.
- If the issue is not reproducible after removing the partner component, Broadcom will not investigate further. At this point, Customer Support at the partner should be contacted.
Refer: Intermittent network disconnects on virtual machines using Cisco ACI VMM integration
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