278 Chapter 10
?– Each client gets bandwidth assigned; all three priorities can be assigned on a block
of bandwidth. That bandwidth is weighted based on client provisioning. A roundrobin
approach allows the service provider to prioritize one customer over the next
fairly. This means that clients will be degraded proportionally across customers on
a weighted basis; all will be degraded by an equal percentage.
?– Rate limiting is based on a ???dual leaky bucket??? because there are two priority levels
(guaranteed and best-effort traffic). The circuit bonding system also allows burst
traffic. Pause frames are used to slow down the transmitter if the client has surpassed
its capacity. A pause frame is also passed on to the customer. Rate limiting
on the circuit- bonding system is accomplished at the client I/O port by using IEEE
802.3 PAUSE frames (if supported by the client device, otherwise, it??™s accomplished
by dropping packets).
?– Flow control, based on client priority classes, is applied using PAUSE frames as well.
Each client can be provisioned with guaranteed, shared, and/or best-effort bandwidth.
This bandwidth can be provisioned in granularities of 1Mb for 10/100 Mbps
Ethernet and 10Mb for Gigabit Ethernet.
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