{"id":1437,"date":"2024-11-07T13:17:02","date_gmt":"2024-11-07T13:17:02","guid":{"rendered":"https:\/\/bogdanburuiana.com\/?p=1437"},"modified":"2025-01-03T13:58:55","modified_gmt":"2025-01-03T13:58:55","slug":"troubleshooting-nsx-t-api-why-route_type-is-returning-as-route-instead-of-expected-values","status":"publish","type":"post","link":"https:\/\/bogdanburuiana.com\/index.php\/2024\/11\/07\/troubleshooting-nsx-t-api-why-route_type-is-returning-as-route-instead-of-expected-values\/","title":{"rendered":"Troubleshooting NSX-T API: Why route_type is Returning as “route” Instead of Expected Values"},"content":{"rendered":"\n

If you’ve been working with the NSX-T API and noticed that the route_type<\/code> returned in the forwarding table API request is only showing as \"route\"<\/code>, you\u2019re not alone. According to the documentation, you should expect more specific values for route_type<\/code>, such as \"c\"<\/code> for connected routes, \"o\"<\/code> for OSPF routes, or \"b\"<\/code> for BGP routes. So why is the API returning just \"route\"<\/code>? <\/p>\n\n\n\n

The Issue at Hand<\/strong><\/p>\n\n\n\n

When querying the forwarding table for a Tier-1 router in NSX-T, a typical GET request to the following API endpoint:<\/p>\n\n\n\n

GET https:\/\/<nsx-manager-ip>\/policy\/api\/v1\/infra\/tier-1s\/T1-test2\/forwarding-table<\/code><\/pre>\n\n\n\n
returns something like this:<\/p>\n\n\n\n
\"route_entries\": [\n  {\n    \"route_type\": \"route\",\n    \"network\": \"10.60.1.9\/24\",\n    \"admin_distance\": 0,\n    \"next_hop\": \"\",\n    \"lr_component_type\": \"SERVICE_ROUTER_TIER1\"\n  }\n]\n<\/code><\/pre>\n\n\n\n
However, according to the documentation, you should be expecting route types like \"c\"<\/code> (connected), \"o\"<\/code> (OSPF), or other types as per the routing protocol in use. In some cases, the response is simply \"route\"<\/code>, which raises the question: why does this happen?<\/p>\n\n\n\n
Possible Causes<\/strong><\/p>\n\n\n\n
There are several potential reasons why you might only see \"route\"<\/code> as the route_type<\/code>. Let’s walk through each one:<\/p>\n\n\n\n
NSX-T Version Mismatch<\/strong><\/p>\n\n\n\n
The behavior you’re observing could be due to a mismatch between the version of NSX-T you’re using and the version referenced in the documentation. Certain features or responses may differ across versions.<\/p>\n\n\n\n
Router Configuration<\/strong><\/p>\n\n\n\n
The configuration of the Tier-1 router plays a big role in the API response. If you\u2019re working with static routes (manually configured), the route_type<\/code> will likely return as \"route\"<\/code>. However, if you have dynamic routing protocols like OSPF or BGP configured, you should see more specific route_type<\/code> values such as \"o\"<\/code> for OSPF or \"b\"<\/code> for BGP.<\/p>\n\n\n\n
Dynamic Routing Protocols Disabled<\/strong><\/p>\n\n\n\n
If dynamic routing protocols (e.g., OSPF, BGP) are not enabled, all routes will return as \"route\"<\/code>. Make sure that these protocols are properly configured and active if you expect to see more detailed route types.<\/p>\n\n\n\n
Limitations of the \/forwarding-table<\/code> API<\/strong><\/p>\n\n\n\n
The \/forwarding-table<\/code> API endpoint may not provide the full range of route types you’re expecting. In some cases, this endpoint may only return basic information. For a more comprehensive look, you might need to use additional or different API endpoints, such as \/routes<\/code>, which may provide more context for each route entry.<\/p>\n\n\n\n
Unexpected Route Types<\/strong><\/p>\n\n\n\n
The behavior you\u2019re seeing might actually be expected depending on the configuration. For example, if the Tier-1 router is only handling static routes, the route_type<\/code> might naturally return as \"route\"<\/code>. This could be a limitation in the router’s configuration or the way it interacts with the API.<\/p>\n\n\n\n
Troubleshooting Steps<\/strong><\/p>\n\n\n\n
If you’re encountering this issue, it\u2019s time to run a few checks to better understand what’s going on. Below is a Python script you can use to query the NSX-T API and analyze the response for anomalies or inconsistencies in the route_type<\/code>.<\/p>\n\n\n\n
Python Script: Querying and Analyzing NSX-T Forwarding Table<\/strong><\/p>\n\n\n\n
This script fetches the forwarding table entries from your NSX-T manager and analyzes the route_type<\/code> values.<\/p>\n\n\n\n
import requests\nimport json\n\n# Configuration\nNSX_MANAGER = \"https:\/\/<nsx-manager-ip>\"\nUSERNAME = \"<your-username>\"\nPASSWORD = \"<your-password>\"\nTIER1_ROUTER = \"T1-test2\"  # Replace with your Tier-1 router name\nAPI_ENDPOINT = f\"{NSX_MANAGER}\/policy\/api\/v1\/infra\/tier-1s\/{TIER1_ROUTER}\/forwarding-table\"\n\n# Disable SSL warnings\nimport urllib3\nurllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)\n\ndef fetch_forwarding_table():\n    try:\n        # API Call\n        response = requests.get(\n            API_ENDPOINT,\n            auth=(USERNAME, PASSWORD),\n            verify=False  # Use verify=True with valid certificates\n        )\n        \n        if response.status_code == 200:\n            data = response.json()\n            analyze_response(data)\n        else:\n            print(f\"Failed to fetch data. Status Code: {response.status_code}\")\n            print(\"Response:\", response.text)\n    except Exception as e:\n        print(f\"Error during API call: {e}\")\n\ndef analyze_response(data):\n    if \"route_entries\" not in data:\n        print(\"No route_entries found in the response.\")\n        return\n    \n    route_entries = data[\"route_entries\"]\n    print(f\"Found {len(route_entries)} route entries.\\n\")\n\n    for idx, entry in enumerate(route_entries, start=1):\n        print(f\"Route Entry {idx}:\")\n        print(f\"  Network: {entry.get('network')}\")\n        print(f\"  Route Type: {entry.get('route_type')}\")\n        print(f\"  Admin Distance: {entry.get('admin_distance')}\")\n        print(f\"  Next Hop: {entry.get('next_hop', 'N\/A')}\")\n        print(f\"  Component Type: {entry.get('lr_component_type', 'N\/A')}\")\n        print(\"-\" * 40)\n\n    # Check for unexpected route types\n    unexpected_route_types = [\n        entry for entry in route_entries if entry.get(\"route_type\") == \"route\"\n    ]\n    if unexpected_route_types:\n        print(\"\\nRoutes with 'route_type' as 'route' found:\")\n        for entry in unexpected_route_types:\n            print(f\"  Network: {entry.get('network')}, Route Type: {entry.get('route_type')}\")\n    else:\n        print(\"\\nNo unexpected route types detected.\")\n\nif __name__ == \"__main__\":\n    fetch_forwarding_table()\n<\/code><\/pre>\n\n\n\n
How the Script Helps<\/strong><\/h3>\n\n\n\n
<\/p>\n\n\n\n
API Call<\/strong>: It makes a GET request to fetch the forwarding table for the Tier-1 router.<\/p>\n\n\n\n
Response Analysis<\/strong>: It checks for the route_entries<\/code> and prints key details, such as network<\/code>, route_type<\/code>, admin_distance<\/code>, and next_hop<\/code>.<\/p>\n\n\n\n
Unexpected Route Types<\/strong>: It specifically checks for entries where the route_type<\/code> is \"route\"<\/code>, so you can investigate them further.<\/p>\n\n\n\n
Error Handling<\/strong>: It also handles common API errors and will help you spot any potential problems in the request.<\/p>\n\n\n\n
    <\/ol>\n\n\n\n
    <\/p>\n\n\n\n
    <\/p>\n","protected":false},"excerpt":{"rendered":"
    If you’ve been working with the NSX-T API and noticed that the route_type returned in the forwarding table API request is only showing as “route”, you\u2019re not alone. According to the documentation, you should expect more specific values for route_type, such as “c” for connected routes, “o” for OSPF routes, or “b” for BGP routes. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"_links":{"self":[{"href":"https:\/\/bogdanburuiana.com\/index.php\/wp-json\/wp\/v2\/posts\/1437"}],"collection":[{"href":"https:\/\/bogdanburuiana.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bogdanburuiana.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bogdanburuiana.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bogdanburuiana.com\/index.php\/wp-json\/wp\/v2\/comments?post=1437"}],"version-history":[{"count":1,"href":"https:\/\/bogdanburuiana.com\/index.php\/wp-json\/wp\/v2\/posts\/1437\/revisions"}],"predecessor-version":[{"id":1439,"href":"https:\/\/bogdanburuiana.com\/index.php\/wp-json\/wp\/v2\/posts\/1437\/revisions\/1439"}],"wp:attachment":[{"href":"https:\/\/bogdanburuiana.com\/index.php\/wp-json\/wp\/v2\/media?parent=1437"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bogdanburuiana.com\/index.php\/wp-json\/wp\/v2\/categories?post=1437"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bogdanburuiana.com\/index.php\/wp-json\/wp\/v2\/tags?post=1437"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}