New-generation Protocols 93
– 802.1p-5/4/3 DiffServ Assured Forwarding;
– 802.1p-5, which presents the lowest loss;
– 802.1p-3, which presents the highest loss;
– 802.1p-2 DiffServ Best Effort.
In the Ethernet environment, flow control is generally a tricky
problem. Various proposals have been made to improve it. In
particular, back-pressure methods involve the sending of control
messages by overloaded switches, thus allowing the connected
switches to cease their transmissions to the congested node for a
period of time indicated in the control guidelines.
The choice made by MEF is based on the DiffServ control scheme,
where we find exactly the same parameters:
– CIR (Committed Information Rate);
– CBS (Committed Burst Size);
– PIR (Peak Information Rate);
– MBS (Maximum Burst Size).
This solution demonstrates the ubiquitousness of the world of
Ethernet, which offers a large number of solutions capable of
competing amongst themselves to satisfy the new generation
necessary in the world of cloudified networks.
4.5. Carrier-Grade Ethernet
Ethernet was designed for computer applications, rather than for
applications in the world of telecommunications, which requires
particular qualities which we call “carrier grade”. In order to conform
to the requirements of the operators, therefore, the Ethernet
environment has had to adapt. We now speak of Carrier-Grade
Ethernet – i.e. a solution acceptable for telecom operators with the
control- and management tools necessary in this case. This mutation
essentially relates to switched Ethernet.
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– 802.1p-5/4/3 DiffServ Assured Forwarding;
– 802.1p-5, which presents the lowest loss;
– 802.1p-3, which presents the highest loss;
– 802.1p-2 DiffServ Best Effort.
In the Ethernet environment, flow control is generally a tricky
problem. Various proposals have been made to improve it. In
particular, back-pressure methods involve the sending of control
messages by overloaded switches, thus allowing the connected
switches to cease their transmissions to the congested node for a
period of time indicated in the control guidelines.
The choice made by MEF is based on the DiffServ control scheme,
where we find exactly the same parameters:
– CIR (Committed Information Rate);
– CBS (Committed Burst Size);
– PIR (Peak Information Rate);
– MBS (Maximum Burst Size).
This solution demonstrates the ubiquitousness of the world of
Ethernet, which offers a large number of solutions capable of
competing amongst themselves to satisfy the new generation
necessary in the world of cloudified networks.
4.5. Carrier-Grade Ethernet
Ethernet was designed for computer applications, rather than for
applications in the world of telecommunications, which requires
particular qualities which we call “carrier grade”. In order to conform
to the requirements of the operators, therefore, the Ethernet
environment has had to adapt. We now speak of Carrier-Grade
Ethernet – i.e. a solution acceptable for telecom operators with the
control- and management tools necessary in this case. This mutation
essentially relates to switched Ethernet.
www.it-ebooks.info