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Metro Ethernet (MetroE)

  • Last Updated : 25 Jul, 2020

Metro Ethernet (MetroE) as the name suggests uses Ethernet links to connect customer network to a service Provider’s device. The customers of Metro Ethernet is usually Enterprises that need to connect their several offices. Metro Ethernet service uses layer 2 standards i.e, it forwards ethernet frames from one customer device to another.

Metro Ethernet is analogous to a large LAN that forwards frames between different VLANs. As the area of service covered by Metro Ethernet is large, Service Providers need to implement Fiber Ethernet standard. Fiber Ethernet supports high speed and long-distance cabling without loss.

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Figure – Metro Ethernet Analogy





Metro Ethernet Implementation :
If we think from customer’s (Enterprise) point of view, each site must be connected to Service Provider’s network. Also, there is no need to connect two enterprise sites directly because that is reason why enterprises are using Metro Ethernet. It is not feasible for any enterprise to lay down Ethernet cables across cities just to connect their different sites.

From Service Provider’s perspective, it needs to place a switch at a place where switch is accessible to a large number of customers. This place is called a Point of Presence (PoP). PoP is chosen by thought in mind that customer’s ethernet standard is able to withstand that distance. The connection between customer and service provider’s device is called user network interface (UNI). User means customer and network refer to Service Provider’s network.


Figure –Metro Ethernet Implementation



For Ethernet standards to be used for Metro Ethernet, IEEE suggest some standards as tabulated below –

Standard NameSpeedDistance
100Base-LX10100 Mbps10 Km
1000Base-LX1 Gbps5 Km
1000Base-LX101 Gbps10 Km
1000Base-ZX1 Gbps100 Km
10GBase-LR10 Gbps10 Km
10GBase-ER10 Gbps40 Km

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