QoS Policies
7210 SAS D, E, K OS Quality of Service Guide Page 45
priority forwarding class service queues, the MBS can be relatively smaller than the other
forwarding class queues because the high-priority service packets are scheduled with priority over
other service forwarding classes.
The MBS is provisioned on ingress and egress service queues within service ingress QoS policies
and service egress QoS policies, respectively. The MBS for network queues are defined within
network queue policies based on the forwarding class. The MBS for a queue is specified in
Kbytes.
On 7210 SAS-D and 7210 SAS-E, the MBS for the queues is not configurable. The MBS value for
the queues is set to appropriate default values which takes care of specific FC needs in terms of
maintaining the differential treatment. The default values used for MBS is available on Table 10
on page 49.
On 7210 SAS-K, the MBS for the queues is user configurable. By default, software assigns a
default value. It can be modified by the user as per their needs. The default values are specified in
the command description.
NOTES:
1. On 7210 SAS-D, per port MBS pool mode is used. With it the maximum MBS per queue,
assuming no other queues on the same port have any traffic is 78 Kbytes. The CLI command
‘show pool port ID access-egress’/‘show pool port ID access-uplink-egress’ are available to
display the values in use depending upon the mode of port. (access/access-uplink).
2. On 7210 SAS-E, per port MBS pool mode is used. With it the maximum MBS per queue,
assuming no other queues on the same port have any traffic is 53 Kbytes.The CLI command
‘show pool port ID access-egress’/‘show pool port ID access-uplink-egress’ are available to
display the values in use depending upon the mode of port. (access/access-uplink).
Table 10: Default CBS and MBS Values
Platforms CBS in KBytes
(Network Queue/ Access
Uplink Queue)
CBS in KBytes
(Access Queue)
MBS in KBytes
(Network Queue/
Access Uplink
Queue)
MBS in KBytes
(Access Queue)
SAS-D 8.4 8.4 See Note 1 See Note 1
SAS-E 3.12 3.12 See Note 2 See Note 2
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