3V0-25.25 · Question #51
3V0-25.25 Question #51: Real Exam Question with Answer & Explanation
The correct answer is D. Log into the edge node of the Tier-0 being deployed and check the routes being learnt.. In VMware Cloud Foundation (VCF), the SDDC Manager automates the deployment and expansion of NSX Edge Clusters. As part of the automated workflow, particularly in VCF 4.x, 5.x, and 9.0, a "Verify BGP Route Distribution" task is executed. This task is a validation check designed t
Question
Options
- ALog into the NSX manager and examine the nsxapi.log for errors.
- BLog into the Tier-1 router to verify that route distribution is being enabled.
- CLog into the vCenter and verify there are no errors or warnings from the NSX manager.
- DLog into the edge node of the Tier-0 being deployed and check the routes being learnt.
Explanation
In VMware Cloud Foundation (VCF), the SDDC Manager automates the deployment and expansion of NSX Edge Clusters. As part of the automated workflow, particularly in VCF 4.x, 5.x, and 9.0, a "Verify BGP Route Distribution" task is executed. This task is a validation check designed to ensure that the newly deployed or expanded Edge nodes are successfully peering with the physical Top-of-Rack (ToR) switches and, more importantly, are actually receiving According to VMware/Broadcom technical documentation (specifically KB 388351), the workflow expects to see at least one route (often the default route or specific physical prefixes) learned via BGP from the northbound peer. If the Edge nodes establish a BGP session but the physical switches are not advertising any routes (or are only advertising routes that the Edge ignores due to filters), the SDDC Manager validation fails with the error "Failed to validate the BGP Route The verified troubleshooting step is to log into the CLI of the Edge node identified in the failure. Using the command get route bgp from within the Tier-0 Service Router (SR) VRF context allows the administrator to see the current Routing Information Base (RIB). If the table is empty or only contains internal "ISR" (Inter-SR) routes, it confirms that the physical network is not providing the expected advertisements. This allows the administrator to correct the BGP advertisement settings on the physical ToR switches--such as enabling default-originate--and then simply "Resume" the task in SDDC Manager without needing to redeploy the entire cluster.
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