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Probe: VMs without Fabric Configured VLANs Probe (Virtual Infra)

Release: Juniper Apstra 5.0

date_range 04-Nov-24

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Purpose

Calculate VMs missing a VLAN and calculate VMs not backed by VLANs on managed leaf devices connected to hypervisors.

Source Processors

VMs backed by Fabric VLANs (generic graph collector)	output stage: VMs backed by Fabric VLANs (number set) (generated from graph)
VMs on hypervisors connected to Fabric (generic)	output stage: VMs on hypervisors connected to Fabric (number set)

Additional Processor(s)

Differences between Fabric and Hypervisor (

set
                                    comparison<processor_set_comparison>

)

input stage(s):

VMs backed by Fabric VLANs (number set)

VMs on hypervisors connected to Fabric (number set)

output stage: VMs not backed by Fabric VLANs (number set)

Affected VM Anomalies (

range
                                    <processor_range>

)

input stage: VMs not backed by Fabric VLANs

output stage: Affected VM Anomalies (discrete state set)

Example Usage

NSX-T Integration - VMs participating in a particular network are attached to an NSX logical switch. In NSX transport zone controls to which hypervisors or ESXi host an NSX logical switch can span. To have VXLAN connectivity for these VMs they need to be part of the same transport zone. This predefined anomaly helps validate that all VLAN backend interfaces defined for NSX-T nodes are also configured on the ToR interfaces connecting that node to the fabric.

VLAN probe anomaly checks for VLAN specification in case of NSX-T via one of the two methods below:

Method One: When you have VMs that are connected to the NSX-T overlay, you can configure a bridge-backed logical switch to provide layer 2 connectivity with other devices or VMs. So via VLAN specification on NSX-T layer 2 bridges and fabric if respective VXLAN VN is not there, then an anomaly is raised.

Method Two: Edge uplinks go out through VLAN logical switches. So let's say if the uplink VLAN logical switch has a particular VLAN ID and respective VLAN on ToR port connected to the hypervisor host is not configured then also this VLAN probe will raise anomalies and help detect such misconfiguration.

The following is a simple topology where nsxcompute_001_server_001 and nsxedge_001_server001 are ESXi hosting VMs that are connected to the NSX-T overlay network.

There is one VM on each ESXi host that needs a VXLAN VN endpoint on each leaf, i.e. nsxcompute_001_leaf1 and nsxedge_001_leaf1 to communicate on the overlay network.

When VXLAN VNs assigned to ToR leaf devices are deleted, VLAN misconfig anomalies are raised as below under Fabric Health in the dashboard.

VMs not backed by Fabric VLANs shows VMs with VLAN missing.

Affected VM Anomalies shows VLAN missing in the fabric.

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Juniper Apstra 5.0.1 / 5.0.0 User Guide

Probe: VMs without Fabric Configured VLANs Probe (Virtual Infra)

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