Pod/LB ARP handling multiple nic in same subnet#2853
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Pull request overview
Adds documentation for a known limitation of Calico’s local-subnet L2 ARP/NDP responder behavior when a host has multiple interfaces on the same L2 segment, and ensures the content is available in Calico Cloud navigation.
Changes:
- Documented the “multiple host interfaces on the same L2 segment” limitation in the existing Calico OSS and Calico Enterprise pages.
- Added the equivalent Calico Cloud page content.
- Registered the new Calico Cloud page in the Calico Cloud sidebar.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| sidebars-calico-cloud.js | Adds the new L2 reachability doc page to the Calico Cloud sidebar navigation. |
| calico/networking/configuring/local-subnet-l2-reachability.mdx | Adds a limitation explaining multi-interface same-L2-segment ARP/NDP behavior. |
| calico-enterprise/networking/configuring/local-subnet-l2-reachability.mdx | Adds the same multi-interface limitation for Enterprise docs. |
| calico-cloud/networking/configuring/local-subnet-l2-reachability.mdx | Introduces the Calico Cloud version of the doc, including the new limitation and full how-to content. |
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| The ARP/NDP responder runs inside Felix (`calico-node`). While a node's Felix is restarting it briefly does not answer ARP or NDP. Established connections keep working because the upstream router and switches still have the node's MAC cached for those IPs, but **a new connection to an IP that is not already cached upstream may fail until Felix finishes starting** and rebuilds its responder state (typically under a minute). |
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Add a limitation about multiple nic in the same subnet of one L2 segment
Copy docs to Calico Cloud
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