Alteon Application Switch Operating System Application Guide
Bandwidth Management
Document ID: RDWR-ALOS-V2900_AG1302 767
Enforcing Policies
For BWM contracts and policies to take effect, the policies must be enforced using the /cfg/bwm/
force ena
command.
Even when BWM is not enforced, Alteon can still collect classification information and report it,
allowing an administrator to observe a network before deciding how to configure it. This feature can
be disabled using
/cfg/bwm/force dis. When this command is used, no limits will be applied on
any contract.
Rate Limiting
A rate limiting contract is controlled by metering the traffic that egresses from Alteon. If the egress
rate is below the configured rate limit (hard limit) for the port, the traffic is transmitted immediately
without any buffering. If the egress rate is above the configured rate limit the traffic above the rate
limit is dropped. This is illustrated in Figure 130 - Bandwidth Rate Limits, page 767
.
Figure 130: Bandwidth Rate Limits
For rate limiting contracts, the queue depth is ignored because traffic is not buffered.
Typically, bandwidth management occurs on the Alteon egress port, meaning the port from which
the frame is leaving. However, when there are multiple routes or trunk groups, the egress port can
actually be one of several ports (from the point-of-view of where the queues are located).
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