azure-expressroute
Expert knowledge for Azure ExpressRoute development including troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when configuring ExpressRoute circuits/gateways, BGP routing (
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SKILL.md
Azure ExpressRoute Skill
This skill provides expert guidance for Azure ExpressRoute. Covers troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. It combines local quick-reference content with remote documentation fetching capabilities.
How to Use This Skill
IMPORTANT for Agent: Use the Category Index below to locate relevant sections. For categories with line ranges (e.g.,
L35-L120), useread_filewith the specified lines. For categories with file links (e.g.,[security.md](security.md)), useread_fileon the linked reference file
IMPORTANT for Agent: If
metadata.generated_atis more than 3 months old, suggest the user pull the latest version from the repository. Ifmcp_microsoftdocstools are not available, suggest the user install it: Installation Guide
This skill requires network access to fetch documentation content:
- Preferred: Use
mcp_microsoftdocs:microsoft_docs_fetchwith query stringfrom=learn-agent-skill. Returns Markdown. - Fallback: Use
fetch_webpagewith query stringfrom=learn-agent-skill&accept=text/markdown. Returns Markdown.
Category Index
| Category | Lines | Description |
|---|---|---|
| Troubleshooting | L37-L42 | Troubleshooting ExpressRoute resiliency and asymmetric routing issues, plus FAQs on connectivity models, supported services, bandwidth, and pricing to resolve design or outage-related questions. |
| Best Practices | L43-L53 | Best practices for ExpressRoute capacity planning, QoS, BGP communities, gateway hardware migration, and validating resiliency via gateway and circuit failover testing. |
| Decision Making | L54-L62 | Guidance on choosing and configuring ExpressRoute gateways, SKUs, resiliency/topology options, VNet connectivity patterns, and planning/managing ExpressRoute-related costs. |
| Architecture & Design Patterns | L63-L74 | Designing resilient, highly available ExpressRoute architectures, including DR patterns, multi-circuit routing/Global Reach, VPN coexistence and failover, and using Microsoft peering for PSTN. |
| Limits & Quotas | L75-L83 | ExpressRoute limits on bandwidth, routes, gateways, FastPath, provider rate limiting, plus monitoring and FAQs to avoid hitting connectivity and quota constraints. |
| Security | L84-L92 | Encryption and security for ExpressRoute: IPsec/MACsec setup, NAT requirements, RBAC roles/permissions, and applying network security controls to private circuits. |
| Configuration | L93-L121 | Configuring ExpressRoute circuits, gateways, routing/peering, BGP (incl. IPv6, communities, BFD), NAT, monitoring, resiliency, and coexistence with VPN using portal, CLI, and PowerShell |
| Integrations & Coding Patterns | L122-L129 | Configuring and automating ExpressRoute circuits and connectivity, including Azure CLI management, NAT setups for Cisco/Juniper, and S2S VPN over Microsoft peering. |
| Deployment | L130-L137 | Guides for deploying and migrating ExpressRoute circuits/gateways, including Direct SKUs, zone/AZ-enabled gateways, and ARM/Terraform-based provisioning and traffic migration. |
Troubleshooting
| Topic | URL |
|---|---|
| Test and validate resiliency of redundant ExpressRoute circuits | https://learn.microsoft.com/en-us/azure/expressroute/evaluate-circuit-resiliency |
| Diagnose and resolve asymmetric routing with ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-asymmetric-routing |
Best Practices
| Topic | URL |
|---|---|
| Apply best practices for ExpressRoute bandwidth upgrades | https://learn.microsoft.com/en-us/azure/expressroute/about-upgrade-circuit-bandwidth |
| Manage complex ExpressRoute networks using BGP communities | https://learn.microsoft.com/en-us/azure/expressroute/bgp-communities |
| Apply QoS requirements for Skype voice over ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-qos |
| Migrate legacy ExpressRoute gateway connections to new hardware | https://learn.microsoft.com/en-us/azure/expressroute/howto-recreate-connections |
| Use Resiliency Insights to harden ExpressRoute gateways | https://learn.microsoft.com/en-us/azure/expressroute/resiliency-insights |
| Validate ExpressRoute gateway resiliency with failover tests | https://learn.microsoft.com/en-us/azure/expressroute/resiliency-validation |
| Test and validate Azure ExpressRoute link failover | https://learn.microsoft.com/en-us/azure/expressroute/test-link-failover |
Decision Making
| Topic | URL |
|---|---|
| Select and configure ExpressRoute virtual network gateways | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-about-virtual-network-gateways |
| Plan and execute ExpressRoute gateway SKU migration | https://learn.microsoft.com/en-us/azure/expressroute/gateway-migration |
| Plan and manage Azure ExpressRoute costs | https://learn.microsoft.com/en-us/azure/expressroute/plan-manage-cost |
| Select ExpressRoute gateway resiliency configuration | https://learn.microsoft.com/en-us/azure/expressroute/resiliency-model |
| Choose VNet connectivity options over ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/virtual-network-connectivity-guidance |
Architecture & Design Patterns
Limits & Quotas
| Topic | URL |
|---|---|
| Evaluate Azure ExpressRoute FastPath limits and usage | https://learn.microsoft.com/en-us/azure/expressroute/about-fastpath |
| Azure ExpressRoute FAQs on limits and connectivity details | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-faqs |
| Monitor ExpressRoute advertised routes to avoid limits | https://learn.microsoft.com/en-us/azure/expressroute/how-to-custom-route-alert |
| Understand rate limiting on provider-based ExpressRoute circuits | https://learn.microsoft.com/en-us/azure/expressroute/provider-rate-limit |
| ExpressRoute scalable gateway features and limits | https://learn.microsoft.com/en-us/azure/expressroute/scalable-gateway |
Security
| Topic | URL |
|---|---|
| Use encryption options with Azure ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-about-encryption |
| Configure IPsec transport mode over ExpressRoute for Windows | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-ipsec-transport-private-windows |
| Configure MACsec security for Azure ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-macsec |
| Roles and permissions for ExpressRoute resources | https://learn.microsoft.com/en-us/azure/expressroute/roles-permissions |
| Apply security controls to Azure ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/secure-expressroute |
Configuration
Integrations & Coding Patterns
| Topic | URL |
|---|---|
| Apply Cisco and Juniper NAT configurations for ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-config-samples-nat |
| Programmatically manage ExpressRoute circuits using Azure CLI | https://learn.microsoft.com/en-us/azure/expressroute/howto-circuit-cli |
| Create and manage ExpressRoute circuits using Azure CLI | https://learn.microsoft.com/en-us/azure/expressroute/howto-circuit-cli |
| Configure S2S VPN over ExpressRoute Microsoft peering | https://learn.microsoft.com/en-us/azure/expressroute/site-to-site-vpn-over-microsoft-peering |
Deployment
| Topic | URL |
|---|---|
| Migrate production traffic between ExpressRoute circuits | https://learn.microsoft.com/en-us/azure/expressroute/circuit-migration |
| Understand ExpressRoute Direct SKUs and technical requirements | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-erdirect-about |
| Deploy an Azure ExpressRoute circuit via ARM template | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-circuit-resource-manager-template |
| Migrate to zone-redundant ExpressRoute gateway SKUs | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-gateway-migration-portal |
| Provision ExpressRoute circuit and gateway using Terraform | https://learn.microsoft.com/en-us/azure/expressroute/quickstart-create-expressroute-vnet-terraform |
Files
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