To control congestion at the output stage, you
can configure the delay-buffer bandwidth. The delay-buffer bandwidth
provides packet buffer space to absorb burst traffic up to the specified
duration of delay. Once the specified delay buffer becomes full, packets
with 100 percent drop probability are dropped from the head of
the buffer.
The default scheduler transmission rate for queues
0 through 7 are 95, 0, 0, 5, 0, 0, 0, and 0 percent
of the total available bandwidth.
The default buffer size percentages for queues
0 through 7 are 95, 0, 0, 5, 0, 0, 0, and 0 percent
of the total available buffer. The total available buffer per queue
differs by PIC type, as shown in Table 29.
To configure the buffer size, include the buffer-size statement at the [edit class-of-service schedulersscheduler-name] hierarchy level:
For each scheduler, you can configure the buffer
size as one of the following:
A percentage of the total buffer. The total buffer per
queue is based on microseconds and differs by platform type, as shown
in Table 29.
The remaining buffer available. The remainder is the buffer
percentage that is not assigned to other queues. For example, if you
assign 40 percent of the delay buffer to queue 0, allow queue 3 to
keep the default allotment of 5 percent, and assign the remainder
to queue 7, then queue 7 uses approximately 55 percent of the delay
buffer.
A temporal value, in microseconds. For the temporal setting,
the queuing algorithm starts dropping packets when it queues more
than a computed number of bytes. This maximum is computed by multiplying
the logical interface speed by the configured temporal value. The
buffer size temporal value per queue differs by platform type, as
shown in Table 29.
