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

# Technical Specifications

> This help topic details the technical specifications of the Megaport network.

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A Port is the high-speed Ethernet interface that connects to the Megaport network. It is configured as an 802.1Q VLAN trunk to support multiple Virtual Cross Connects - each presented as a unique VLAN.

These tables summarize the technical specifications for Megaport services:

| **Interface Speed** | **Interface**                                                     |
| ------------------- | ----------------------------------------------------------------- |
| 1 Gbps              | 1000BASE-LX (10km; duplex on <Gloss term="SMOF" anchor="smof" />) |
| 10 Gbps             | 10GBASE-LR (10km; duplex on SMOF)                                 |
| 100 Gbps            | 100GBASE-LR4 (10km; duplex on SMOF)                               |
| 400 Gbps            | 400GBASE-LR4 (10km; duplex on SMOF)                               |

| **Service Attribute**                           | **Service Parameter/Value**                                                                                                                                                                                                                                                                                                                                                                                                |
| ----------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| MAC Layer                                       | IEEE 802.3-2002                                                                                                                                                                                                                                                                                                                                                                                                            |
| Maximum Ethernet Frame Size (MTU)               | VXCs support an Ethernet MTU of 9100 bytes.<br />MVEs support a VXC Ethernet MTU of up to 9100 bytes; however, the supported IP MTU depends on the MVE vendor and the configuration. For more information, contact your Megaport Account Manager.<br />Megaport Internet VXCs are limited to an MTU of 1500 bytes.<br />IX and many CSP ports do not support jumbo frames, but all support the standard MTU of 1500 bytes. |
| VLAN Ethernet Type                              | 0x8100                                                                                                                                                                                                                                                                                                                                                                                                                     |
| <Gloss term="Q-in-Q (802.1ad)" anchor="qinq" /> | Supported                                                                                                                                                                                                                                                                                                                                                                                                                  |
| CoS Level                                       | Standard                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Unicast Frame Delivery                          | Deliver Unconditionally                                                                                                                                                                                                                                                                                                                                                                                                    |
| Multicast Frame Delivery                        | Deliver Unconditionally                                                                                                                                                                                                                                                                                                                                                                                                    |
| Broadcast Frame Delivery                        | Deliver Unconditionally                                                                                                                                                                                                                                                                                                                                                                                                    |

## Layer 2 control tunneling

| **Protocol**                                                                                                                                                                                                                                              | **Action**                                                         |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------ |
| <Gloss term="STP" anchor="stp" />, <Gloss term="RSTP" anchor="rstp" />, <Gloss term="MSTP" anchor="mstp" />, <span className="tooltip">PVST+<span className="tooltiptext">Per-VLAN Spanning Tree and Per VLAN Spanning Tree Plus Protocols.</span></span> | Tunnel                                                             |
| <Gloss term="PAUSE (802.3x)" anchor="pause-802-3x" />                                                                                                                                                                                                     | Discard                                                            |
| <Gloss term="LACP (802.1ax/802.3ad)" anchor="lacp" />                                                                                                                                                                                                     | Discard - See Link Aggregation Control Protocol (LACP) note below. |
| <Gloss term="Link OAM" anchor="link-oam" />                                                                                                                                                                                                               | Discard                                                            |
| <Gloss term="PNAC (802.1x)" anchor="pnac" />                                                                                                                                                                                                              | Tunnel (MACsec only) - See MACsec note below.                      |
| <Gloss term="E-LMI" anchor="elmi" />                                                                                                                                                                                                                      | Tunnel                                                             |
| <Gloss term="GARP" anchor="garp" />                                                                                                                                                                                                                       | Tunnel                                                             |

<Note>
  * Link aggregation is supported using Link Aggregation Control Protocol (LACP). You can use LACP on an individual interface if you plan to add interfaces in the future. Link aggregation is supported locally by enabling LACP when creating a Port, but LACP is not carried across a VXC. For more information about Link Aggregation Groups, see [Creating a Link Aggregation Group](/connections/lag).
  * LACP is supported for VXCs set to 'Untag'. LACP allows bundling of customer's network over the underlying VXCs and is supported for existing and new deployments.
</Note>

<Note>
  <Gloss term="802.1ae MACsec" anchor="macsec" /> (0x88e5) frames are transported only on untagged VXCs, or over tagged VXCs when the VLAN is not encrypted.\
  Some equipment does not support unencrypted VLANs. Check whether the equipment you use supports unencrypted VLANs, also known as <Gloss term="802.1Q" anchor="8021q" /> clear tag mode, before using MACsec-encrypted traffic over tagged VXCs.
</Note>

<Note>
  Megaport polices traffic to the committed information rate (CIR) of the ordered VXC speed. Megaport does not shape customer traffic. You can configure your own shaper if required; however, do not exceed four megabytes for the committed burst size (CBS).
</Note>