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7950 XRS Quality of Service Guide
Page 437
the network queue policy. This prevents the
high-prio-only
command for the shared queue policy
from having an affect on the queue.
Default
The
high-prio-only
forwarding class defaults are listed in the table below.
Parameters
percent —
The amount of queue buffer space, expressed as a decimal percentage of the MBS.
Values
0 — 100 | default
mbs
Syntax
mbs
percent
no mbs
Context
config>qos>shared-queue>queue
Description
This command specifies the relative amount of the buffer pool space for the maximum buffers for a
specific ingress network MDA forwarding class queue or egress network port forwarding class queue.
The MBS value is used to by a queue to determine whether it has exhausted its total allowed buffers
while enqueuing 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. Setting proper CBS parameters and controlling CBS oversubscription is one
major safeguard to queue starvation (when a queue does not receive its fair share of buffers). Another
is properly setting the RED slope parameters for the needs of the network queues.
The MBS size can sometimes be smaller than the CBS. This will result in a portion of the CBS for the
queue to be unused and should be avoided.
Default
The
mbs
forwarding class defaults are listed in the table below.
Forwarding Class
Fowarding Class Label
Default high-prio-only
Network-Control
nc
10
High-1
h1
10
Expedited
ef
10
High-2
h2
10
Low-1
l1
10
Assured
af
10
Low-2
l2
10
Best-Effort
be
10
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