Alcatel-Lucent 7750 Configuration Manual page 327

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It is important to note that this command does not actually set aside buffers within the buffer pool for CBS
reservation. The CBS value per queue only determines the point at which enqueuing packets are subject to a
RED slope. Oversubscription of CBS could result in a queue operating within its CBS size and still not able
to enqueue a packet due to unavailable buffers. The resv-cbs parameter can be changed at any time.
If the total pool size is 10 MB and the resv-cbs set to 5, the 'reserved size' is 500 KB.
The no form of this command restores the default value.
The no resv-cbs command will clear all the adaptive configurations. There cannot be any adaptive sizing
enabled for default resv-cbs.
Default default (30%)
Parameters percent-or-default — Specifies the pool buffer size percentage.
Values
amber-alarm-action step percent — specifies the percentage step-size for the reserved CBS size of the
pool. When using the default value, the adaptive CBS sizing is disabled. To enable adaptive CBS sizing,
step percent must be set to non-default value along with the max parameter. When reserved CBS is
default adaptive CBS sizing cannot be enabled. The reserved CBS (Committed Burst Size) defines the
amount of buffer space within the pool that is not considered shared.
Values
Default
max [1..100] — Specifies the maximum percentage for the reserved CBS size of the pool. When using the
default value, the adaptive CBS sizing is disabled. To enable adaptive CBS sizing, max value must be
set to non-default value along with the step percent. When reserved CBS is default adaptive CBS sizing
cannot be enabled. The reserved CBS (Committed Burst Size) defines the amount of buffer space within
the pool that is not considered shared. Max reserved CBS must not be more than the reserved CBS.
Values
Default
amber-alarm-threshold
Syntax amber-alarm-threshold percentage
no amber-alarm-threshold
Context config>card>mda>access>egress>pool
config>card>mda>access>ingress>pool
config>card>mda>network>egress>pool
config>card>mda>network>ingress>pool
7750 SR Interface Configuration Guide
A reference point is established to compare the currently assigned (provisioned) total CBS with the
amount the buffer pool considers to be reserved. Based on the percentage of the pool reserved that
has been provisioned, the over provisioning factor can be calculated.
The size of the shared portion of the buffer pool is indirectly established. The shared size is
important to the calculation of the instantaneous-shared-buffer-utilization and the average-shared-
buffer-utilization variables used in Random Early Detection (RED) per packet slope plotting.
0 — 100, default
1 — 100
0
1 — 100
0
Interface Configuration
Page 327