Table of Contents
Advertisement
The CBS for a queue is used to determine whether the queue has exhausted its reserved buffers
while en-queuing packets. Once the queue has exceeded the amount of buffers considered in
reserve it must contend with other queues for the available shared buffer space within the system
buffer pool. Access to the shared pool is controlled through Random Early Detection (RED)
application. Oversubscription of CBS is not allowed.
Two RED slopes are maintained for each queue. A high priority slope is used by in-profile
packets. A low priority slope is used by out-of-profile packets. The RED slopes are not user
configurable.
The no form of this command returns the CBS size for the queue to the default value.
Default
Queue1— 1024KB
Queue[2 to 6] — 2048 KB
Queue[7 to 8] —512KB
Parameters
<in kilo bytes> — pecifies the CBS values in kilo bytes.
Values
mbs
Syntax
[no] mbs <in kilo bytes>
Context
config>multipoint-management>bandwidth-policy>queue
Description
The Maximum Burst Size (MBS) command is used to specify maximum amount of buffers that
can be used by a particular queue from the shared pool of buffers. This value is specified in
kilobytes.
The MBS value is used by a queue to determine whether it has exhausted its total allowed buffers
while en-queuing packets. Once the queue has exceeded its maximum amount of buffers, all
packets are discarded until the queue transmits a packet. A queue that has not exceeded its MBS
size is not guaranteed that a buffer will be available when needed or that the packet's RED slope
will not force the discard of the packet.
The no form of the command returns the MBS size for the queue to the default value.
Default
Queue[1 to 6] — 6144 KB
Queue[7 to 8] — 2048KB
Parameters
<in kilo bytes> — Specifies the MBS values in kilo bytes.
Values
7210 SAS-X and 7210 SAS-R6 OS Quality of Service Guide
0—131072
0—131072
Page 421
Advertisement
Table of Contents
