Port Traffic Controls
Guaranteed Minimum Bandwidth (GMB)
Syntax: [ no ] int < port-list > bandwidth-min output
[ < queue1% > < queue2% > < queue3% > < queue4% > <queue5%>
<queue6%> <queue7%> <queue8%>]
For ports in < port-list >, specifies the minimum outbound
bandwidth as a percent of the total bandwidth for each
outbound queue. The queues receive service in descending
order of priority. You must specify a bandwidth percent
value for all eight queues, and the sum of the bandwidth
percentages must not exceed 100%. (0 is a value for a queue
percentage setting.) Configuring a total of less than 100%
across the eight queues results in unallocated bandwidth
that remains harmlessly unused unless a given queue
becomes oversubscribed. In this case, the unallocated
bandwidth is apportioned to oversubscribed queues in
descending order of priority. For example, if you configure
a minimum of 10% for queues 1 - 7, and 0% for queue 8,
then the unallocated bandwidth will be available to all eight
queues in the following prioritized order:
1. Queue 8 (high priority)
2. Queue 7 (high priority)
3. Queue 6 (medium priority)
4. Queue 5 (medium priority)
5. Queue 4 (normal priority)
6. Queue 3 (normal priority)
7. Queue 2 (low priority)
8. Queue 1 (low priority)
A setting of 0 (zero %) on a queue means that no bandwidth
minimum is specifically reserved for that queue for each
of the ports in < port-list >. Also, there is no benefit to setting
the high-priority queue (queue 8) to 0 (zero) unless you
want the medium queue (queue 4) to be able to support
traffic bursts above its guaranteed minimum.
(continued)
12-15
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