The MEF 2 also allows end users to choose
a variety of protection parameters for a Carrier Ethernet service. These protection
parameters must be applicable on a per service or a group level. Any of the ETH layer
protection mechanisms in MEF 2 should be able to work in conjunction with the lower
layer (transport) protection mechanisms.
Quality of Service
As mentioned earlier, Provide Bridge Transport (PBT) can provide deterministic transport
of Ethernet services, and hence QoS much like other underlying transport used
to deliver Carrier Ethernet. This is, in fact, a critical requirement of Carrier Ethernet,
one that needs to be addressed well before the market begins to embrace it more wholeheartedly.
At the ETH layer, MEF 10 has undertaken a significant amount of effort
toward defining and implementing QoS to ensure rigorous SLAs.
Table 2.5 notes some of the key developments in the standards bodies??™ with regard
to Carrier Ethernet QoS.
TABLE 2.4 Standards Efforts Enabling Reliability
Key Components Major Developments Reference
Service resiliency Less than 50 ms resiliency has been
defi ned as a critical requirement
MEF 2, IEEE 802.
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