Azure ExpressRoute monitoring data reference

This article contains all the monitoring reference information for this service.

See Monitor Azure ExpressRoute for details on the data you can collect for ExpressRoute and how to use it.

Metrics

This section lists all the automatically collected platform metrics for this service. These metrics are also part of the global list of all platform metrics supported in Azure Monitor.

For information on metric retention, see Azure Monitor Metrics overview.

Supported metrics for Microsoft.Network/expressRouteCircuits

The following table lists the metrics available for the Microsoft.Network/expressRouteCircuits resource type.

Table headings

• Metric - The metric display name as it appears in the Azure portal.
• Name in Rest API - Metric name as referred to in the REST API.
• Unit - Unit of measure.
• Aggregation - The default aggregation type. Valid values: Average, Minimum, Maximum, Total, Count.
• Dimensions - Dimensions available for the metric.
• Time Grains - Intervals at which the metric is sampled. For example, PT1M indicates that the metric is sampled every minute, PT30M every 30 minutes, PT1H every hour, and so on.
• DS Export- Whether the metric is exportable to Azure Monitor Logs via Diagnostic Settings. For information on exporting metrics, see Create diagnostic settings in Azure Monitor.

Category	Metric	Name in REST API	Unit	Aggregation	Dimensions	Time Grains	DS Export
Circuit Availability	Arp Availability ARP Availability from MSEE towards all peers.	ArpAvailability	Percent	Average	PeeringType, Peer	PT1M	Yes
Circuit Availability	Bgp Availability BGP Availability from MSEE towards all peers.	BgpAvailability	Percent	Average	PeeringType, Peer	PT1M	Yes
Circuit Traffic	BitsInPerSecond Bits ingressing Azure per second	BitsInPerSecond	BitsPerSecond	Average	PeeringType, DeviceRole	PT1M	Yes
Circuit Traffic	BitsOutPerSecond Bits egressing Azure per second	BitsOutPerSecond	BitsPerSecond	Average	PeeringType, DeviceRole	PT1M	Yes
Fastpath	FastPathRoutesCount Count of fastpath routes configured on circuit	FastPathRoutesCountForCircuit	Count	Maximum	<none>	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
GlobalReach Traffic	GlobalReachBitsInPerSecond Bits ingressing Azure per second	GlobalReachBitsInPerSecond	BitsPerSecond	Average	PeeredCircuitSKey	PT1M	No
GlobalReach Traffic	GlobalReachBitsOutPerSecond Bits egressing Azure per second	GlobalReachBitsOutPerSecond	BitsPerSecond	Average	PeeredCircuitSKey	PT1M	No
Circuit Qos	DroppedInBitsPerSecond Ingress bits of data dropped per second	QosDropBitsInPerSecond	BitsPerSecond	Average	<none>	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Circuit Qos	DroppedOutBitsPerSecond Egress bits of data dropped per second	QosDropBitsOutPerSecond	BitsPerSecond	Average	<none>	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes

Supported metrics for Microsoft.Network/expressRouteCircuits/peerings

The following table lists the metrics available for the Microsoft.Network/expressRouteCircuits/peerings resource type.

Table headings

• Metric - The metric display name as it appears in the Azure portal.
• Name in Rest API - Metric name as referred to in the REST API.
• Unit - Unit of measure.
• Aggregation - The default aggregation type. Valid values: Average, Minimum, Maximum, Total, Count.
• Dimensions - Dimensions available for the metric.
• Time Grains - Intervals at which the metric is sampled. For example, PT1M indicates that the metric is sampled every minute, PT30M every 30 minutes, PT1H every hour, and so on.
• DS Export- Whether the metric is exportable to Azure Monitor Logs via Diagnostic Settings. For information on exporting metrics, see Create diagnostic settings in Azure Monitor.

Metric	Name in REST API	Unit	Aggregation	Dimensions	Time Grains	DS Export
BitsInPerSecond Bits ingressing Azure per second	BitsInPerSecond	BitsPerSecond	Average	<none>	PT1M	Yes
BitsOutPerSecond Bits egressing Azure per second	BitsOutPerSecond	BitsPerSecond	Average	<none>	PT1M	Yes

Supported metrics for microsoft.network/expressroutegateways

The following table lists the metrics available for the microsoft.network/expressroutegateways resource type.

Table headings

• Metric - The metric display name as it appears in the Azure portal.
• Name in Rest API - Metric name as referred to in the REST API.
• Unit - Unit of measure.
• Aggregation - The default aggregation type. Valid values: Average, Minimum, Maximum, Total, Count.
• Dimensions - Dimensions available for the metric.
• Time Grains - Intervals at which the metric is sampled. For example, PT1M indicates that the metric is sampled every minute, PT30M every 30 minutes, PT1H every hour, and so on.
• DS Export- Whether the metric is exportable to Azure Monitor Logs via Diagnostic Settings. For information on exporting metrics, see Create diagnostic settings in Azure Monitor.

Category	Metric	Name in REST API	Unit	Aggregation	Dimensions	Time Grains	DS Export
Traffic	Bits In Per Second Bits per second ingressing Azure via ExpressRoute Gateway which can be further split for specific connections	ErGatewayConnectionBitsInPerSecond	BitsPerSecond	Average	ConnectionName	PT1M	No
Traffic	Bits Out Per Second Bits per second egressing Azure via ExpressRoute Gateway which can be further split for specific connections	ErGatewayConnectionBitsOutPerSecond	BitsPerSecond	Average	ConnectionName	PT1M	No
Scalability	Active Flows Number of Active Flows on ExpressRoute Gateway	ExpressRouteGatewayActiveFlows	Count	Average, Minimum, Maximum	roleInstance	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	No
Performance	Bits Received Per second Total Bits received on ExpressRoute Gateway per second	ExpressRouteGatewayBitsPerSecond	BitsPerSecond	Average, Minimum, Maximum	roleInstance	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	No
Scalability	Count Of Routes Advertised to Peer Count Of Routes Advertised To Peer by ExpressRoute Gateway	ExpressRouteGatewayCountOfRoutesAdvertisedToPeer	Count	Maximum	roleInstance, BgpPeerAddress	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Scalability	Count Of Routes Learned from Peer Count Of Routes Learned From Peer by ExpressRoute Gateway	ExpressRouteGatewayCountOfRoutesLearnedFromPeer	Count	Maximum	roleInstance, BgpPeerAddress	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Performance	CPU utilization CPU Utilization of the ExpressRoute Gateway	ExpressRouteGatewayCpuUtilization	Percent	Average, Minimum, Maximum	roleInstance	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Scalability	Frequency of Routes change Frequency of Routes change in ExpressRoute Gateway	ExpressRouteGatewayFrequencyOfRoutesChanged	Count	Total (Sum)	roleInstance	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	No
Scalability	Max Flows Created Per Second Maximum Number of Flows Created Per Second on ExpressRoute Gateway	ExpressRouteGatewayMaxFlowsCreationRate	CountPerSecond	Maximum	roleInstance, direction	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	No
Scalability	Number of VMs in the Virtual Network Number of VMs in the Virtual Network	ExpressRouteGatewayNumberOfVmInVnet	Count	Maximum	<none>	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	No
Performance	Packets received per second Total Packets received on ExpressRoute Gateway per second	ExpressRouteGatewayPacketsPerSecond	CountPerSecond	Average, Minimum, Maximum	roleInstance	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	No

Supported metrics for Microsoft.Network/expressRoutePorts

The following table lists the metrics available for the Microsoft.Network/expressRoutePorts resource type.

Table headings

• Metric - The metric display name as it appears in the Azure portal.
• Name in Rest API - Metric name as referred to in the REST API.
• Unit - Unit of measure.
• Aggregation - The default aggregation type. Valid values: Average, Minimum, Maximum, Total, Count.
• Dimensions - Dimensions available for the metric.
• Time Grains - Intervals at which the metric is sampled. For example, PT1M indicates that the metric is sampled every minute, PT30M every 30 minutes, PT1H every hour, and so on.
• DS Export- Whether the metric is exportable to Azure Monitor Logs via Diagnostic Settings. For information on exporting metrics, see Create diagnostic settings in Azure Monitor.

Metric	Name in REST API	Unit	Aggregation	Dimensions	Time Grains	DS Export
AdminState Admin state of the port	AdminState	Count	Average, Minimum, Maximum, Count	Link	PT1M	Yes
FastPathRoutesCount Count of fastpath routes configured on port	FastPathRoutesCountForDirectPort	Count	Maximum	<none>	PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
LineProtocol Line protocol status of the port	LineProtocol	Count	Average, Minimum, Maximum, Count	Link	PT1M	Yes
BitsInPerSecond Bits ingressing Azure per second	PortBitsInPerSecond	BitsPerSecond	Average, Minimum, Maximum, Count	Link	PT1M	No
BitsOutPerSecond Bits egressing Azure per second	PortBitsOutPerSecond	BitsPerSecond	Average, Minimum, Maximum, Count	Link	PT1M	No
RxLightLevel Rx Light level in dBm	RxLightLevel	Count	Average, Minimum, Maximum, Count	Link, Lane	PT1M	Yes
TxLightLevel Tx light level in dBm	TxLightLevel	Count	Average, Minimum, Maximum, Count	Link, Lane	PT1M	Yes

Metrics information

Follow links in these lists for more information about metrics from the preceding tables.

ExpressRoute circuits metrics:

• ARP Availability
• BGP Availability
• BitsInPerSecond
• BitsOutPerSecond
• DroppedInBitsPerSecond
• DroppedOutBitsPerSecond
• GlobalReachBitsInPerSecond
• GlobalReachBitsOutPerSecond
• FastPathRoutesCount

ExpressRoute gateways metrics:

• Bits received per second
• CPU utilization
• Packets per second
• Count of routes advertised to peer
• Count of routes learned from peer
• Frequency of routes changed
• Number of VMs in virtual network
• Active flows
• Max flows created per second

ExpressRoute gateway connections metrics:

• BitsInPerSecond
• BitsOutPerSecond

ExpressRoute Direct metrics:

• BitsInPerSecond
• BitsOutPerSecond
• DroppedInBitsPerSecond
• DroppedOutBitsPerSecond
• AdminState
• LineProtocol
• RxLightLevel
• TxLightLevel
• FastPathRoutesCount

ExpressRoute Traffic Collector metrics:

• CPU utilization
• Memory Utilization
• Count of flow records processed

Circuits metrics

ARP Availability - Split by Peering

Aggregation type: Avg

You can view near to real-time availability of ARP (Layer-2 connectivity) across peerings and peers (Primary and Secondary ExpressRoute routers). This dashboard shows the Private Peering ARP session status is up across both peers, but down for Microsoft peering for both peers. The default aggregation (Average) was utilized across both peers.

BGP Availability - Split by Peer

Aggregation type: Avg

You can view near to real-time availability of BGP (Layer-3 connectivity) across peerings and peers (Primary and Secondary ExpressRoute routers). This dashboard shows the Primary BGP session status is up for private peering and the Second BGP session status is down for private peering.

Bits In and Out - Metrics across all peerings

Aggregation type: Avg

You can view metrics across all peerings on a given ExpressRoute circuit.

Bits In and Out - Metrics per peering

Aggregation type: Avg

You can view metrics for private, public, and Microsoft peering in bits/second.

Virtual network gateway metrics

Aggregation type: Avg

When you deploy an ExpressRoute gateway, Azure manages the compute and functions of your gateway. There are six gateway metrics available to you to better understand the performance of your gateway:

• Bits received per second
• CPU Utilization
• Packets per seconds
• Count of routes advertised to peers
• Count of routes learned from peers
• Frequency of routes changed
• Number of VMs in the virtual network
• Active flows
• Max flows created per second

We highly recommended you set alerts for each of these metrics so that you're aware of when your gateway could be seeing performance issues.

Bits received per second - Split by instance

Aggregation type: Avg

This metric captures inbound bandwidth utilization on the ExpressRoute virtual network gateway instances. Set an alert for how frequent the bandwidth utilization exceeds a certain threshold. If you need more bandwidth, increase the size of the ExpressRoute virtual network gateway.

CPU Utilization - Split by instance

Aggregation type: Avg

You can view the CPU utilization of each gateway instance. The CPU utilization might spike briefly during routine host maintenance but prolong high CPU utilization could indicate your gateway is reaching a performance bottleneck. Increasing the size of the ExpressRoute gateway might resolve this issue. Set an alert for how frequent the CPU utilization exceeds a certain threshold.

Packets Per Second - Split by instance

Aggregation type: Avg

This metric captures the number of inbound packets traversing the ExpressRoute gateway. You should expect to see a consistent stream of data here if your gateway is receiving traffic from your on-premises network. Set an alert for when the number of packets per second drops below a threshold indicating that your gateway is no longer receiving traffic.

Count of Routes Advertised to Peer - Split by instance

Aggregation type: Max

This metric shows the number of routes the ExpressRoute gateway is advertising to the circuit. The address spaces might include virtual networks that are connected using virtual network peering and uses remote ExpressRoute gateway. You should expect the number of routes to remain consistent unless there are frequent changes to the virtual network address spaces. Set an alert for when the number of advertised routes drop below the threshold for the number of virtual network address spaces you're aware of.

Count of routes learned from peer - Split by instance

Aggregation type: Max

This metric shows the number of routes the ExpressRoute gateway is learning from peers connected to the ExpressRoute circuit. These routes can be either from another virtual network connected to the same circuit or learned from on-premises. Set an alert for when the number of learned routes drop below a certain threshold. This metric can indicate either the gateway is seeing a performance problem or remote peers are no longer advertising routes to the ExpressRoute circuit.

Frequency of routes change - Split by instance

Aggregation type: Sum

This metric shows the frequency of routes being learned from or advertised to remote peers. You should first investigate your on-premises devices to understand why the network is changing so frequently. A high frequency in routes change could indicate a performance problem on the ExpressRoute gateway where scaling the gateway SKU up might resolve the problem. Set an alert for a frequency threshold to be aware of when your ExpressRoute gateway is seeing abnormal route changes.

Number of VMs in the virtual network

Aggregation type: Max

This metric shows the number of virtual machines that are using the ExpressRoute gateway. The number of virtual machines might include VMs from peered virtual networks that use the same ExpressRoute gateway. Set an alert for this metric if the number of VMs goes above a certain threshold that could affect the gateway performance.

Active flows

Aggregation type: Avg

Split by: Gateway Instance

This metric displays a count of the total number of active flows on the ExpressRoute Gateway. Only inbound traffic from on-premises is captured for active flows. Through split at instance level, you can see active flow count per gateway instance. For more information, see understand network flow limits.

Max flows created per second

Aggregation type: Max

Split by: Gateway Instance and Direction (Inbound/Outbound)

This metric displays the maximum number of flows created per second on the ExpressRoute Gateway. Through split at instance level and direction, you can see max flow creation rate per gateway instance and inbound/outbound direction respectively. For more information, see understand network flow limits.

Gateway connections in bits/seconds

Aggregation type: Avg

This metric shows the bits per second for ingress and egress to Azure through the ExpressRoute gateway. You can split this metric further to see specific connections to the ExpressRoute circuit.

ExpressRoute Direct metrics

Bits In Per Second - Split by link

Aggregation type: Avg

You can view the bits in per second across both links of the ExpressRoute Direct port pair. Monitor this dashboard to compare inbound bandwidth for both links.

Bits Out Per Second - Split by link

Aggregation type: Avg

You can also view the bits out per second across both links of the ExpressRoute Direct port pair. Monitor this dashboard to compare outbound bandwidth for both links.

Admin State - Split by link

Aggregation type: Avg

You can view the Admin state for each link of the ExpressRoute Direct port pair. The Admin state represents if the physical port is on or off. This state is required to pass traffic across the ExpressRoute Direct connection.

Line Protocol - Split by link

Aggregation type: Avg

You can view the line protocol across each link of the ExpressRoute Direct port pair. The Line Protocol indicates if the physical link is up and running over ExpressRoute Direct. Monitor this dashboard and set alerts to know when the physical connection goes down.

Rx Light Level - Split by link

Aggregation type: Avg

You can view the Rx light level (the light level that the ExpressRoute Direct port is receiving) for each port. Healthy Rx light levels generally fall within a range of -10 dBm to 0 dBm. Set alerts to be notified if the Rx light level falls outside of the healthy range.

Tx Light Level - Split by link

Aggregation type: Avg

You can view the Tx light level (the light level that the ExpressRoute Direct port is transmitting) for each port. Healthy Tx light levels generally fall within a range of -10 dBm to 0 dBm. Set alerts to be notified if the Tx light level falls outside of the healthy range.

ExpressRoute Traffic Collector metrics

CPU Utilization - Split by instance

Aggregation type: Avg (of percentage of total utilized CPU)

Granularity: 5 min

You can view the CPU utilization of each ExpressRoute Traffic Collector instance. The CPU utilization might spike briefly during routine host maintenance, but prolonged high CPU utilization could indicate your ExpressRoute Traffic Collector is reaching a performance bottleneck.

Guidance: Set an alert for when avg CPU utilization exceeds a certain threshold.

Memory Utilization - Split by instance

Aggregation type: Avg (of percentage of total utilized Memory)

Granularity: 5 min

You can view the memory utilization of each ExpressRoute Traffic Collector instance. Memory utilization might spike briefly during routine host maintenance, but prolonged high memory utilization could indicate your Azure Traffic Collector is reaching a performance bottleneck.

Guidance: Set an alert for when avg memory utilization exceeds a certain threshold.

Count of flow records processed - Split by instances or ExpressRoute circuit

Aggregation type: Count

Granularity: 5 min

You can view the count of number of flow records processed by ExpressRoute Traffic Collector, aggregated across ExpressRoute Circuits. Customer can split the metrics across each ExpressRoute Traffic Collector instance or ExpressRoute circuit when multiple circuits are associated to the ExpressRoute Traffic Collector. Monitoring this metric helps you understand if you need to deploy more ExpressRoute Traffic Collector instances or migrate ExpressRoute circuit association from one ExpressRoute Traffic Collector deployment to another.

Guidance: Splitting by circuits is recommended when multiple ExpressRoute circuits are associated with an ExpressRoute Traffic Collector deployment. This metric helps determine the flow count of each ExpressRoute circuit and ExpressRoute Traffic Collector utilization by each ExpressRoute circuit.

Metric dimensions

For information about what metric dimensions are, see Multi-dimensional metrics.

This service has the following dimensions associated with its metrics.

Dimension for ExpressRoute circuit:

Dimension Name	Description
PeeringType	The type of peering configured. The supported values are Microsoft and Private peering.
Peering	The supported values are Primary and Secondary.
DeviceRole
PeeredCircuitSkey	The remote ExpressRoute circuit service key connected using Global Reach.

Dimension for ExpressRoute gateway:

Dimension Name	Description
BgpPeerAddress
ConnectionName
direction
roleInstance	The gateway instance. Each ExpressRoute gateway is composed of multiple instances. The supported values are GatewayTenantWork_IN_X, where X is a minimum of 0 and a maximum of the number of gateway instances -1.

Dimension for Express Direct:

Dimension Name	Description
Lane
Link	The physical link. Each ExpressRoute Direct port pair is composed of two physical links for redundancy, and the supported values are link1 and link2.

Resource logs

This section lists the types of resource logs you can collect for this service. The section pulls from the list of all resource logs category types supported in Azure Monitor.

Supported resource logs for Microsoft.Network/expressRouteCircuits

Category	Category display name	Log table	Supports basic log plan	Supports ingestion-time transformation	Example queries	Costs to export
PeeringRouteLog	Peering Route Table Logs	AzureDiagnostics Logs from multiple Azure resources.	No	No	Queries	No

Azure Monitor Logs tables

This section lists the Azure Monitor Logs tables relevant to this service, which are available for query by Log Analytics using Kusto queries. The tables contain resource log data and possibly more depending on what is collected and routed to them.

ExpressRoute Microsoft.Network/expressRouteCircuits

• AzureActivity
• AzureMetrics
• AzureDiagnostics

Activity log

The linked table lists the operations that may be recorded in the activity log for this service. This is a subset of all the possible resource provider operations in the activity log.

For more information on the schema of activity log entries, see Activity Log schema.

• Microsoft.Network resource provider operations

The following table lists the operations related to ExpressRoute that might be created in the Activity log.

Operation	Description
All Administrative operations	All administrative operations including create, update, and delete of an ExpressRoute circuit.
Create or update ExpressRoute circuit	An ExpressRoute circuit was created or updated.
Deletes ExpressRoute circuit	An ExpressRoute circuit was deleted.

For more information on the schema of Activity Log entries, see Activity Log schema.

Schemas

For detailed description of the top-level diagnostic logs schema, see Supported services, schemas, and categories for Azure Diagnostic Logs.

When you review any metrics through Log Analytics, the output contains the following columns:

Column	Type	Description
TimeGrain	string	PT1M (metric values are pushed every minute)
Count	real	Usually equal to 2 (each MSEE pushes a single metric value every minute)
Minimum	real	The minimum of the two metric values pushed by the two MSEEs
Maximum	real	The maximum of the two metric values pushed by the two MSEEs
Average	real	Equal to (Minimum + Maximum)/2
Total	real	Sum of the two metric values from both MSEEs (the main value to focus on for the metric queried)

Related content

• See Monitor Azure ExpressRoute for a description of monitoring ExpressRoute.
• See Monitor Azure resources with Azure Monitor for details on monitoring Azure resources.