1---2name: azure-expressroute3description: 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 designing ExpressRoute circuits/gateways, BGP routing, Global Reach, FastPath, or VPN coexistence, and other Azure ExpressRoute related development tasks. Not for Azure Internet Peering (use azure-internet-peering), Azure Virtual WAN (use azure-virtual-wan), Azure VPN Gateway (use azure-vpn-gateway), Azure Virtual Network (use azure-virtual-network).4---5# Azure ExpressRoute Skill
6
7This 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.
8
9## How to Use This Skill
10
11> **IMPORTANT for Agent**: Use the **Category Index** below to locate relevant sections. For categories with line ranges (e.g., `L35-L120`), use `read_file` with the specified lines. For categories with file links (e.g., `[security.md](security.md)`), use `read_file` on the linked reference file
12
13> **IMPORTANT for Agent**: If `metadata.generated_at` is more than 3 months old, suggest the user pull the latest version from the repository. If `mcp_microsoftdocs` tools are not available, suggest the user install it: [Installation Guide](https://github.com/MicrosoftDocs/mcp/blob/main/README.md)
14
15This skill requires **network access** to fetch documentation content:
16- **Preferred**: Use `mcp_microsoftdocs:microsoft_docs_fetch` with query string `from=learn-agent-skill`. Returns Markdown.
17- **Fallback**: Use `fetch_webpage` with query string `from=learn-agent-skill&accept=text/markdown`. Returns Markdown.
18
19## Category Index
20
21| Category | Lines | Description |
22|----------|-------|-------------|
23| 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. |
24| Best Practices | L43-L50 | Best practices for ExpressRoute upgrades, complex BGP routing, QoS for Skype voice, and migrating legacy gateways to newer hardware configurations. |
25| Decision Making | L51-L58 | Guidance on choosing ExpressRoute gateways, resiliency and VNet connectivity options, and planning/managing ExpressRoute bandwidth and circuit costs. |
26| Architecture & Design Patterns | L59-L70 | Designing resilient, highly available ExpressRoute architectures, including DR patterns, multi-circuit routing/Global Reach, VPN coexistence and failover, and using Microsoft peering for PSTN. |
27| Limits & Quotas | L71-L79 | ExpressRoute limits on bandwidth, routes, gateways, FastPath, provider rate limiting, plus monitoring and FAQs to avoid hitting connectivity and quota constraints. |
28| Security | L80-L88 | Encryption and security for ExpressRoute: IPsec/MACsec setup, NAT requirements, RBAC roles/permissions, and applying network security controls to private circuits. |
29| Configuration | L89-L121 | Configuring and managing ExpressRoute circuits, gateways, routing/peering, BGP, NAT, monitoring, resiliency, and coexistence with VPN using portal, PowerShell, and CLI. |
30| 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. |
31| Deployment | L130-L138 | Guides for deploying and migrating ExpressRoute circuits/gateways, including Direct SKUs, zone/AZ-enabled gateways, and ARM/Terraform-based provisioning and traffic migration. |
32
33### Troubleshooting
34| Topic | URL |
35|-------|-----|
36| Test and validate resiliency of redundant ExpressRoute circuits | https://learn.microsoft.com/en-us/azure/expressroute/evaluate-circuit-resiliency |
37| Diagnose and resolve asymmetric routing with ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-asymmetric-routing |
38
39### Best Practices
40| Topic | URL |
41|-------|-----|
42| Apply best practices for ExpressRoute bandwidth upgrades | https://learn.microsoft.com/en-us/azure/expressroute/about-upgrade-circuit-bandwidth |
43| Manage complex ExpressRoute networks using BGP communities | https://learn.microsoft.com/en-us/azure/expressroute/bgp-communities |
44| Apply QoS requirements for Skype voice over ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-qos |
45| Migrate legacy ExpressRoute gateway connections to new hardware | https://learn.microsoft.com/en-us/azure/expressroute/howto-recreate-connections |
46
47### Decision Making
48| Topic | URL |
49|-------|-----|
50| Choose and configure ExpressRoute gateway SKUs | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-about-virtual-network-gateways |
51| Plan and manage Azure ExpressRoute costs | https://learn.microsoft.com/en-us/azure/expressroute/plan-manage-cost |
52| Select ExpressRoute gateway resiliency configuration | https://learn.microsoft.com/en-us/azure/expressroute/resiliency-model |
53| Choose VNet connectivity options over ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/virtual-network-connectivity-guidance |
54
55### Architecture & Design Patterns
56| Topic | URL |
57|-------|-----|
58| Design resilient Azure ExpressRoute network architectures | https://learn.microsoft.com/en-us/azure/expressroute/design-architecture-for-resiliency |
59| Design disaster recovery with Azure ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/designing-for-disaster-recovery-with-expressroute-privatepeering |
60| Architect high availability for Azure ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/designing-for-high-availability-with-expressroute |
61| Connect multiple ExpressRoute circuits with Global Reach | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-global-reach |
62| Optimize routing across multiple ExpressRoute circuits | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-optimize-routing |
63| Architect coexisting ExpressRoute and S2S VPN connections | https://learn.microsoft.com/en-us/azure/expressroute/how-to-configure-coexisting-gateway-portal |
64| Design S2S VPN backup for ExpressRoute private peering | https://learn.microsoft.com/en-us/azure/expressroute/use-s2s-vpn-as-backup-for-expressroute-privatepeering |
65| Use ExpressRoute Microsoft peering for PSTN services | https://learn.microsoft.com/en-us/azure/expressroute/using-expressroute-for-microsoft-pstn |
66
67### Limits & Quotas
68| Topic | URL |
69|-------|-----|
70| Evaluate Azure ExpressRoute FastPath limits and usage | https://learn.microsoft.com/en-us/azure/expressroute/about-fastpath |
71| Azure ExpressRoute FAQs on limits and connectivity details | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-faqs |
72| Monitor ExpressRoute advertised routes to avoid limits | https://learn.microsoft.com/en-us/azure/expressroute/how-to-custom-route-alert |
73| Understand rate limiting on provider-based ExpressRoute circuits | https://learn.microsoft.com/en-us/azure/expressroute/provider-rate-limit |
74| ExpressRoute scalable gateway features and limits | https://learn.microsoft.com/en-us/azure/expressroute/scalable-gateway |
75
76### Security
77| Topic | URL |
78|-------|-----|
79| Use encryption options with Azure ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-about-encryption |
80| Configure IPsec transport mode over ExpressRoute for Windows | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-ipsec-transport-private-windows |
81| Configure MACsec security for Azure ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-macsec |
82| Roles and permissions for ExpressRoute resources | https://learn.microsoft.com/en-us/azure/expressroute/roles-permissions |
83| Apply security controls to Azure ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/secure-expressroute |
84
85### Configuration
86| Topic | URL |
87|-------|-----|
88| Configure customer-controlled maintenance windows for ExpressRoute gateways | https://learn.microsoft.com/en-us/azure/expressroute/customer-controlled-gateway-maintenance |
89| Configure BFD settings for Azure ExpressRoute private peering | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-bfd |
90| Configure on-premises routers for Azure ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-config-samples-routing |
91| Configure Azure ExpressRoute virtual network gateways in portal | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-add-gateway-portal-resource-manager |
92| Manage ExpressRoute virtual network gateways with PowerShell | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-add-gateway-resource-manager |
93| Add IPv6 support to ExpressRoute private peering | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-add-ipv6 |
94| Configure coexisting ExpressRoute and S2S VPN connections (classic) | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-coexist-classic |
95| Configure coexisting ExpressRoute and S2S VPN gateways | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-coexist-resource-manager |
96| Connect VNets to ExpressRoute circuits with PowerShell | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-linkvnet-arm |
97| Link Azure VNets to ExpressRoute circuits via CLI | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-linkvnet-cli |
98| Reset ExpressRoute circuit peerings with PowerShell | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-reset-peering |
99| Reset ExpressRoute circuit peerings in Azure portal | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-reset-peering-portal |
100| Configure ExpressRoute routing and peering with PowerShell | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-routing-arm |
101| Configure ExpressRoute peering in Azure portal | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-routing-portal-resource-manager |
102| Configure a scalable ExpressRoute gateway in portal | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-scalable-portal |
103| Configure ExpressRoute Global Reach with PowerShell | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-set-global-reach |
104| Configure ExpressRoute Global Reach in Azure portal | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-set-global-reach-portal |
105| Configure NAT requirements for Azure ExpressRoute circuits | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-nat |
106| Configure Connection Monitor for ExpressRoute connectivity | https://learn.microsoft.com/en-us/azure/expressroute/how-to-configure-connection-monitor |
107| Configure custom BGP communities for ExpressRoute private peering | https://learn.microsoft.com/en-us/azure/expressroute/how-to-configure-custom-bgp-communities |
108| Configure custom BGP community values for ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/how-to-configure-custom-bgp-communities-portal |
109| Configure ExpressRoute Traffic Collector and Log Analytics | https://learn.microsoft.com/en-us/azure/expressroute/how-to-configure-traffic-collector |
110| Configure Azure ExpressRoute Direct resources | https://learn.microsoft.com/en-us/azure/expressroute/how-to-expressroute-direct-portal |
111| Configure route filters for ExpressRoute Microsoft peering | https://learn.microsoft.com/en-us/azure/expressroute/how-to-routefilter-portal |
112| Configure ExpressRoute peering using Azure CLI | https://learn.microsoft.com/en-us/azure/expressroute/howto-routing-cli |
113| Use Azure Monitor metrics and logs for ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/monitor-expressroute-reference |
114| Configure rate limiting on ExpressRoute Direct circuits | https://learn.microsoft.com/en-us/azure/expressroute/rate-limit |
115| Use Resiliency Insights for ExpressRoute gateways | https://learn.microsoft.com/en-us/azure/expressroute/resiliency-insights |
116| Validate ExpressRoute gateway resiliency and failover | https://learn.microsoft.com/en-us/azure/expressroute/resiliency-validation |
117
118### Integrations & Coding Patterns
119| Topic | URL |
120|-------|-----|
121| Apply Cisco and Juniper NAT configurations for ExpressRoute | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-config-samples-nat |
122| Programmatically manage ExpressRoute circuits using Azure CLI | https://learn.microsoft.com/en-us/azure/expressroute/howto-circuit-cli |
123| Create and manage ExpressRoute circuits using Azure CLI | https://learn.microsoft.com/en-us/azure/expressroute/howto-circuit-cli |
124| Configure S2S VPN over ExpressRoute Microsoft peering | https://learn.microsoft.com/en-us/azure/expressroute/site-to-site-vpn-over-microsoft-peering |
125
126### Deployment
127| Topic | URL |
128|-------|-----|
129| Migrate production traffic between ExpressRoute circuits | https://learn.microsoft.com/en-us/azure/expressroute/circuit-migration |
130| Understand ExpressRoute Direct SKUs and technical requirements | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-erdirect-about |
131| Deploy an Azure ExpressRoute circuit via ARM template | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-circuit-resource-manager-template |
132| Migrate to zone-redundant ExpressRoute gateway SKUs | https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-gateway-migration-portal |
133| Migrate ExpressRoute gateways to AZ-enabled SKUs | https://learn.microsoft.com/en-us/azure/expressroute/gateway-migration |
134| Provision ExpressRoute circuit and gateway using Terraform | https://learn.microsoft.com/en-us/azure/expressroute/quickstart-create-expressroute-vnet-terraform |
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