---
title: "CL Port Diagrams - Ethernet"
slug: "cl-port-diagrams-ethernet"
description: "Learn about Cascade Lake CNode configurations, including NIC settings and VAST support for optimal networking in your deployment."
updated: 2026-10-26T23:15:21Z
published: 2026-10-26T23:15:21Z
canonical: "docs.vastdata.com/cl-port-diagrams-ethernet"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vastdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# CL Port Diagrams - Ethernet

> [!NOTE]
> ℹ️ Info
> 
> The Green Port - the leftmost RJ45 on the Cascade Lake CNode (The Green Port) is “reserved” and is not used in a VAST Deployment.

> [!WARNING]
> ⚠️ Warning
> 
> Networking is configured on a per-CNode basis, it is possible for a chassis to have CNodes with differing configurations. If you are unsure of the configuration of a particular CNode, please contact VAST Support for assistance.

## Cascade Lake CBox with single CX5 NIC in Ethernet Mode

![The Images shows the rear view of a server with the ports labeled by number.](https://cdn.us.document360.io/89b91113-5dc6-49db-86ec-57b16dc8ce56/Images/Documentation/2fec1dd9-fec8-4733-a39c-bbd43eae91f2.png?sv=2026-02-06&spr=https&st=2026-11-08T10%3A14%3A37Z&se=2026-11-08T11%3A14%3A37Z&sr=c&sp=r&sig=1sWnQKlYFViqB%2Fd1%2BUWga80XHjo5Rq2zRbWcBjlQYPo%3D)

| **Cascade Lake CBox** |
| --- |
| Number | Name | Port Location | Function | PCIe B:D.F |
| 1 | CNode 1 |  |  |  |
| 2 | CNode 2 |  |  |  |
| 3 | CNode 3 |  |  |  |
| 4 | CNode 4 |  |  |  |
| 5 | PSU 1 |  |  |  |
| 6 | PSU 2 |  |  |  |
| 7 | enp94s0f0 | Right Card – Left Port | Unified | `5e:00.0` |
| 8 | enp94s0f1 | Right Card – Right Port | Unified | `5e:00.1` |
| 9 | eno1 | 1 GbE Port 1 (Left) | MGMT/IPMI (*TECH) |  |
| 10 | eno2 | 1 GbE Port 2 (Right) | TECH (*MGMT) |  |

*in B2B IPMI configuration the MGMT port is moved to 1GbE port 2 (eno2) and the TECH port is moved to 1GbE port 1 (eno1).

---

## Cascade Lake CBox with Dual CX5 or CX5+CX6 NIC in ETH + ETH mode

![The Images shows the rear view of a server with the ports labeled by number.](https://cdn.us.document360.io/89b91113-5dc6-49db-86ec-57b16dc8ce56/Images/Documentation/f911d3df-5c35-4e92-9d83-5f1c928e8d82.png?sv=2026-02-06&spr=https&st=2026-11-08T10%3A14%3A37Z&se=2026-11-08T11%3A14%3A37Z&sr=c&sp=r&sig=1sWnQKlYFViqB%2Fd1%2BUWga80XHjo5Rq2zRbWcBjlQYPo%3D)

| **Cascade Lake CBox** |
| --- |
| Number | Name | Port Location | Function | PCIe B:D.F |
| 1 | CNode 1 |  |  |  |
| 2 | CNode 2 |  |  |  |
| 3 | CNode 3 |  |  |  |
| 4 | CNode 4 |  |  |  |
| 5 | PSU 1 |  |  |  |
| 6 | PSU 2 |  |  |  |
| 7 | enp94s0f0 | Right Card – Left Port | Internal | `5e:00.0` |
| 8 | enp94s0f1 | Right Card – Right Port | Internal | `5e:00.1` |
| 9 | enp59s0f1 | Left NIC - Left Port | Northbound / Split | `3b:00.1` |
| 10 | enp59s0f0 | Left NIC - Right Port | Northbound / Split | `3b:00.0` |
| 11 | eno1 | 1 GbE Port 1 (Left) | MGMT/IPMI (*TECH) |  |
| 12 | eno2 | 1 GbE Port 2 (Right) | TECH (*MGMT) |  |

*in B2B IPMI configuration the MGMT port is moved to 1GbE port 2 (eno2) and the TECH port is moved to 1GbE port 1 (eno1).

---

## Cascade Lake CBox with Dual CX5 or CX5+CX6 NIC in ETH mode with “Skip NIC - External” enabled

> [!NOTE]
> ℹ️ Info
> 
> The “Skip NIC - External” flag is a setting that can be set either in the VAST GUI Installer or via the command line `configure_network.py` tool. This flag is set on a per-CNode basis.

> [!WARNING]
> ⚠️ Warning
> 
> Since this is a per-CNode setting, it is possible for a chassis to have CNodes with differing configurations. If you are unsure of the configuration of a CNode, please contact VAST Support for assistance.

When this flag is used, VAST instructs the auto-ports feature to disable the NIC that is typically designated for **northbound** traffic. This means that if you use this flag on a node with two NICs, the NIC designated for **internal** traffic will handle **both internal and external** (aka Unified) network traffic. This means the network interfaces that would typically be solely used for **northbound** connections are effectively disabled. This flag is not valid on a single NIC CNode.

![The Images shows the rear view of a server with the ports labeled by number.](https://cdn.us.document360.io/89b91113-5dc6-49db-86ec-57b16dc8ce56/Images/Documentation/f911d3df-5c35-4e92-9d83-5f1c928e8d82.png?sv=2026-02-06&spr=https&st=2026-11-08T10%3A14%3A37Z&se=2026-11-08T11%3A14%3A37Z&sr=c&sp=r&sig=1sWnQKlYFViqB%2Fd1%2BUWga80XHjo5Rq2zRbWcBjlQYPo%3D)

| **Cascade Lake CBox** |
| --- |
| Number | Name | Port Location | Function | PCIe B:D.F |
| 1 | CNode 1 |  |  |  |
| 2 | CNode 2 |  |  |  |
| 3 | CNode 3 |  |  |  |
| 4 | CNode 4 |  |  |  |
| 5 | PSU 1 |  |  |  |
| 6 | PSU 2 |  |  |  |
| 7 | enp94s0f0 | Right Card – Left Port | Unified | `5e:00.0` |
| 8 | enp94s0f1 | Right Card – Right Port | Unified | `5e:00.1` |
| 9 | enp59s0f1 | Left NIC - Left Port | Disabled | `3b:00.1` |
| 10 | enp59s0f0 | Left NIC - Right Port | Disabled | `3b:00.0` |
| 11 | eno1 | 1 GbE Port 1 (Left) | MGMT/IPMI (*TECH) |  |
| 12 | eno2 | 1 GbE Port 2 (Right) | TECH (*MGMT) |  |

*in B2B IPMI configuration the MGMT port is moved to 1GbE port 2 (eno2) and the TECH port is moved to 1GbE port 1 (eno1).

---

## Cascade Lake CBox with CX5+CX6 NIC in ETH mode with “Skip NIC - Internal” enabled

> [!NOTE]
> ℹ️ Info
> 
> The “Skip NIC - Internal” flag is a setting that can be set either in the VAST GUI Installer or via the command line `configure_network.py` tool. This flag is set on a per-CNode basis.

> [!WARNING]
> ⚠️ Warning
> 
> Since this is a per-CNode setting, it is possible for a chassis to have CNodes with differing configurations. If you are unsure of the configuration of a CNode, please contact VAST Support for assistance.

When this flag is used, VAST instructs the auto-ports feature to disable the NIC that is typically designated for **internal** traffic. This means that if you use this flag on a node with two NICs, the NIC designated for **northbound** traffic will handle **both internal and external** (aka Unified) network traffic. This means the network interfaces that would typically be solely used for **internal** connections are effectively disabled. This flag is not valid on a single NIC CNode.

![The Images shows the rear view of a server with the ports labeled by number.](https://cdn.us.document360.io/89b91113-5dc6-49db-86ec-57b16dc8ce56/Images/Documentation/f911d3df-5c35-4e92-9d83-5f1c928e8d82.png?sv=2026-02-06&spr=https&st=2026-11-08T10%3A14%3A37Z&se=2026-11-08T11%3A14%3A37Z&sr=c&sp=r&sig=1sWnQKlYFViqB%2Fd1%2BUWga80XHjo5Rq2zRbWcBjlQYPo%3D)

| **Cascade Lake CBox** |
| --- |
| Number | Name | Port Location | Function | PCIe B:D.F |
| 1 | CNode 1 |  |  |  |
| 2 | CNode 2 |  |  |  |
| 3 | CNode 3 |  |  |  |
| 4 | CNode 4 |  |  |  |
| 5 | PSU 1 |  |  |  |
| 6 | PSU 2 |  |  |  |
| 7 | enp94s0f0 | Right Card – Left Port | Disabled | `5e:00.0` |
| 8 | enp94s0f1 | Right Card – Right Port | Disabled | `5e:00.1` |
| 9 | enp59s0f1 | Left NIC - Left Port | Unified | `3b:00.1` |
| 10 | enp59s0f0 | Left NIC - Right Port | Unified | `3b:00.0` |
| 11 | eno1 | 1 GbE Port 1 (Left) | MGMT/IPMI (*TECH) |  |
| 12 | eno2 | 1 GbE Port 2 (Right) | TECH (*MGMT) |  |

*in B2B IPMI configuration the MGMT port is moved to 1GbE port 2 (eno2) and the TECH port is moved to 1GbE port 1 (eno1).

---

## Cascade Lake CBox with CX5+CX6 NIC in ETH + ETH mode with “Reverse NICs” enabled

> [!NOTE]
> ℹ️ Info
> 
> The “Reverse NICs” flag is a setting that can be set either in the VAST GUI Installer or via the command line `configure_network.py` tool. This flag is set on a per-CNode basis.

> [!WARNING]
> ⚠️ Warning
> 
> Since this is a per-CNode setting, it is possible for a chassis to have CNodes with differing configurations. If you are unsure of the configuration of a CNode, please contact VAST Support for assistance.

The “Reverse NICs” flag refers to a specific configuration that swaps the roles between the NIC intended for **northband** traffic and the NIC intended for **internal** traffic. This is primarily used in scenarios where the physical cabling or hardware layout necessitates a reversal of these roles.

![The Images shows the rear view of a server with the ports labeled by number.](https://cdn.us.document360.io/89b91113-5dc6-49db-86ec-57b16dc8ce56/Images/Documentation/f911d3df-5c35-4e92-9d83-5f1c928e8d82.png?sv=2026-02-06&spr=https&st=2026-11-08T10%3A14%3A37Z&se=2026-11-08T11%3A14%3A37Z&sr=c&sp=r&sig=1sWnQKlYFViqB%2Fd1%2BUWga80XHjo5Rq2zRbWcBjlQYPo%3D)

| **Cascade Lake CBox** |
| --- |
| Number | Name | Port Location | Function | PCIe B:D.F |
| 1 | CNode 1 |  |  |  |
| 2 | CNode 2 |  |  |  |
| 3 | CNode 3 |  |  |  |
| 4 | CNode 4 |  |  |  |
| 5 | PSU 1 |  |  |  |
| 6 | PSU 2 |  |  |  |
| 7 | enp94s0f0 | Right Card – Left Port | Northbound/Split | `5e:00.0` |
| 8 | enp94s0f1 | Right Card – Right Port | Northbound/Split | `5e:00.1` |
| 9 | enp59s0f1 | Left NIC - Left Port | Internal | `3b:00.1` |
| 10 | enp59s0f0 | Left NIC - Right Port | Internal | `3b:00.0` |
| 11 | eno1 | 1 GbE Port 1 (Left) | MGMT/IPMI (*TECH) |  |
| 12 | eno2 | 1 GbE Port 2 (Right) | TECH (*MGMT) |  |

*in B2B IPMI configuration the MGMT port is moved to 1GbE port 2 (eno2) and the TECH port is moved to 1GbE port 1 (eno1).

---

> [!NOTE]
> ℹ️ Note
> 
> Using the Skip NIC and Reverse NIC functionality together is supported, but has extremely limited use cases. Thus it is not documented here.