Metro Ethernet

METROETHERNET

A metropolitan-area Ethernet, Ethernet MAN, or metro Ethernet network is a metropolitan area network (MAN) that is based on Ethernetstandards.

It is commonly used to connect subscribers to a larger service network or the Internet.

Businesses can also use metropolitan-area Ethernet to connect their own offices to each other.

Advantages

·         An Ethernet interface is much less expensive

·         Ethernet also supports high bandwidths with fine granularity

·         Ethernet-based access network is that it can be easily connected to the customer network, due to the prevalent use of Ethernet in corporate and, more recently, residential networks. 

ME 3400 ,catalyst 3750 , ME3800X, ME 4900,

Metro Ethernet (ME) Classification

1.      Point-to-point (PtP)

a.      A single point-to-point Ethernet circuit provisioned between two User Network Interfaces (UNIs).

b.      Also referred as Ethernet Line Service Type (E-Line)

2.      Multipoint-to-multipoint (MPtMP)

a.      A single multipoint-to-multipoint Ethernet circuit provisioned between two or more UNIs.

b.      Also referred as  Ethernet LAN Service Type (E-LAN)     

Within these two service types, Metro Ethernet services can be created by assigning values to a set of  attributes grouped according to the following:

}  User Node Interface (UNI)

}  Network Node Interface (NNI)

}  Ethernet virtual connection (EVC)

 Ethernet virtual connection (EVC)

• Association of two or more UNIs that limits the exchange of service frames to UNIs within the EVC.

User Node Interface (UNI)

• By default, UNI interface is in shutdown status, this you can use for access ports and all UNI interfaces even they are in the same VLAN but cannot access with each other.

Network Node Interface (UNI)

• By default, NNI interface is in no shutdown status.
• NNI port you can use for trunk ports, It use to connect two switches.
• NNI can communicate with UNI, NNI can communicate with NNI too.