Inter-pod IPv6 Route is Missing on Control Plane/Node Pool in NSX

Products

• VMware Telco Cloud Automation

Issue/Introduction

Symptoms:

• Inter-pod IPv6 routing fails, leading to CNF onboarding failures. This issue occurs in pure IPv6 and dual-stack (IPv6/IPv4) workload clusters attached to an NSX segment. Specifically, IPv6 routes are missing on the control plane and node pool nodes, making IPv6 traffic unreachable.
• In a functional environment, the IPv6 routing table includes the expected prefix:

# Example of a healthy route entry
abc[ ~ ]$  ip -6 r
fc00:xxx:xxx:xxx::/64 dev eth0 proto ra metric 1024 expires 2591998sec pref medium

• In the affected state, the route entry is missing:

# Example of the missing route
abc[ ~ ]$  ip -6 r

 

Environment

VMware Telco Cloud Automation 3.4

Cause

The issue is triggered when the Neighbor Discovery (ND) Profile attached to the Tier-1 (T1) Gateway is configured with the DHCP with Address and DNS through DHCP mode.

Resolution

To resolve the issue, modify the ND Profile settings for the T1 Gateway:

1. Navigate to the ND Profile configuration in the NSX Manager.
2. Change the mode from DHCP with Address and DNS through DHCP to SLAAC with Address and DNS through DHCP.
3. Attach the updated ND profile to the affected T1 Gateway.

Additional Information

Please see below:

https://techdocs.broadcom.com/us/en/vmware-sde/telco-cloud/vmware-telco-cloud-automation/3-4/vmware-telco-cloud-automation-release-notes/vmware-telco-cloud-automation-34-release-notes.html