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Fenced vApps fails in vCloud Director 8.20 after upgrading to NSX for vSphere 6.3.x (2150010)

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Symptoms

After upgrading from NSX to 6.3.x and NSX Edge Gateways to 6.3.x in vCloud Director 8.20, you experience these symptoms:
  • Fence vApps fails
  • Virtual machines in a fenced network fails to communicate to its gateway

Cause

In NSX 6.3.x Edge Gateways, a new route table is introduced (table 251) which is always looked up first for routes. The main table (table 254) is looked up only when the table 251 does not have a route. The issue occurs because the device routes (a /32 route for vApp VM) are auto-plumbed to the main table, whereas table 251 already has a default route in it. Therefore, since the table 251 already has a default route, the lookup never happens on the main table and hence the fenced vApp virtual machines lose connectivity.

Resolution

This issue is resolved in VMware NSX for vSphere 6.3.2, available at VMware Downloads.

To work around this issue if you have already upgraded to NSX for vSphere 6.3.0 or 6.3.1 using Fenced vApps in vCloud Director 8.20, contact VMware Support. To contact VMware support, see Filing a Support Request in My VMware (2006985) or How to Submit a Support Request.

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