added content

Author: marciocloudflare

src/content/docs/network-interconnect/get-started.mdx

@@ -21,4 +21,15 @@ Eligibility for CNI and port availability is determined in coordination with you
 
 ### Product use cases
 
-<Render file="cni-product-use-cases" product="networking-services" />
+<Render file="cni-product-use-cases" product="networking-services" />
+
+### Technical specifications
+
+- **Supported port types (Direct CNI):** 10G-LR (single-mode fiber) and 100G-LR (single-mode fiber).
+- **Distance limitations:** Cloudflare does not support optical links longer than 10 km. For longer distances, you must use intermediate hardware or a third-party provider to extend the connection.
+- **IP addressing:** All CNI connections use a `/31` subnet for point-to-point IP connectivity between your router and Cloudflare's.
+- **VLAN support:** CNI ports may be assigned a single 802.1Q VLAN tag.
+- **MTU considerations:**
+  - **Dataplane 1.0:** Requires GRE tunneling for Magic Transit / WAN traffic, limiting the MTU to 1476 bytes.
+  - **Dataplane 1.1:** Supports a native 1500-byte MTU for traffic from Cloudflare to you (ingress), but still requires a 1476-byte MTU for traffic from you to Cloudflare (egress).
+- **Bidirectional Forwarding Detection (BFD):** BFD provides fast failure detection for BGP sessions and is supported on direct connections. To enable BFD, contact your account team. Note that BFD on a CNI does not impact the failover time for Magic Transit / WAN tunnels, which rely on separate health checks.