Networking erc

ExpressRoute circuit naming convention

The CAF abbreviation for ExpressRoute circuit is erc. Names can be 1 to 80 characters long and allow alphanumerics, hyphens and underscores. The name must be unique within the resource group.

Naming rules

CAF abbreviation	erc
Length	1 to 80 characters
Allowed characters	Alphanumerics (a-z, A-Z, 0-9), hyphens, underscores
Scope of uniqueness	Unique within the resource group
CAF pattern	erc-{workload}-{environment}-{region}-{instance}

Rules follow Microsoft's resource naming rules and CAF abbreviations. Some resource types have extra start/end character restrictions, so verify against the official docs before locking in a convention.

Example names

Generated by the same engine as the name generator, so length and character rules are already applied.

Scenario	Generated name	Length
Payments API, production	`erc-payments-prod-eus-001`	25/80
Web app, development	`erc-webapp-dev-weu-002`	22/80
Analytics with company prefix	`erc-contoso-analytics-stage-uks-001`	35/80

Naming in Terraform and Bicep

Build the name from variables so one module produces the right name in every environment.

Terraform

locals {
  expressroute_circuit_name = "erc-${var.workload}-${var.environment}-${var.region}-001"
}

Bicep

var expressrouteCircuitName = 'erc-${workload}-${environment}-${region}-001'

Generate ExpressRoute circuit names for your workload

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Related Networking resources

agw Application gateway asg Application security group (ASG) cdnp CDN profile cdne CDN endpoint con Connection dnsfrs DNS forwarding ruleset dnspr DNS private resolver in DNS private resolver inbound endpoint

See the full list of Azure resource naming rules or read the complete CAF naming guide.