These frames are delivered without any
performance guarantees and are not CIR-conformant; however, service frames that are
not EIR-conformant are discarded.
Again, independent of the EIR, the service frames are always sent at the speed of the
UNI (and hence, the EIR represents the average rate).
Excess Burst Size (EBS) The EBS is the limit on the maximum number, or bursts,
of service frames in bytes allowed for incoming service frames so they are still EIRconformant
Color Mode and Color Marking In addition to the bandwidth profile traffic parameters,
there is also the concept of marking the service frames with a color. The color
of a service frame is used to determine whether or not a particular service frame is in
conformance with its bandwidth profile.
A service marked green is conformant with the CIR and CBS in the bandwidth profile.
A green frame is always delivered per the performance SLA associated with the service.
15 If multiple services are being delivered over a UNI, then the sum of the CIRs associated with individual
services must be less than or equal to the UNI speed.
64 Chapter 2
Yellow frames are out-of-bandwidth profile and will be delivered only if there are adequate
bandwidth resources; if, on the other hand, the network is congested, then the
frame is discarded.
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