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Training / NCP-AIN / Cumulus

Unit 10: VRF

Per-unit concept, checklist, and command drill page

Unit 10 of 14

Objective

Operate multi-tenant routing isolation and management-plane separation using VRFs.

Concept Notes

VRF is a hard-separation tool for routing domains and management paths. In multi-tenant or segmented environments, it prevents route leakage and reduces blast radius during faults.

Exam questions often test context mistakes: commands run in the wrong VRF can lead to incorrect conclusions. Always confirm the VRF context before interpreting reachability or policy behavior.

Coverage Checklist

  • Independent routing tables per VRF and tenant isolation model.
  • Management VRF (mgmt) behavior and OOB traffic isolation.
  • Interface and loopback assignment to VRFs.
  • Service execution in VRF context.
  • Operational testing and troubleshooting across VRF boundaries.

Practice Outcomes

  • Separate management and data-plane control paths intentionally.
  • Run diagnostics in explicit VRF context to avoid false negatives.
  • Inspect full VRF routing state during tenant incident triage.

Command Drills 

nv set vrf BLUE table auto

Create an isolated routing domain.

nv set interface swp1 ip vrf BLUE

Attach interface routing behavior to target VRF.

vtysh -c 'show vrf'

Audit active VRFs and table associations.

Navigation

Back to Cumulus index Previous: Unit 9 Next: Unit 11