Service Manual

acceptance of packets, and the buer oset limit for resuming the acceptance of
received packets. This method of conguration enables dierent peer-provided and
administrative priorities to be set up because the intended queue is directly
congured instead of determining the priority to queue mapping for local and
remote parameters.
queue 0 to queue 7 Specify the queue number to which the QoS policy buer parameters apply
pause Pause frames to be sent at the specied buer limit levels and pause packet
settings
no-drop The packets for this queue must not be dropped
value Enter a number in the range of 0 to 7 to denote the priority to be allocated to the
dynamic buer control mechanism
buer-size Ingress buer size
size Size of the ingress buer in KB. Enter a number in the range of 0 to 7787. The
default is 45 KB.
pause-threshold Buer limit for pause frames to be sent
threshold-value Buer limit at which the port sends the pause to peer in KB. Enter a number in the
range of 0 to 7787. The default is 10 KB.
resume-oset Buer oset limit for resuming in KB
threshold-value Buer oset limit at which the port resumes the peer in KB. Enter a number in the
range of 1 to 7787. The default is 10 KB.
shared-threshold-
weight
Buer shared threshold weight
size Weightage of the priorities on the shared buer size in the system. Enter a number
in the range of 0 to 9. The default shared threshold weight is 10.
Default The default size of the ingress buer is 45 KB. The default buer limit at which the port sends the pause to
peer and recommences the sending of packets to the peer is 10 KB. The default threshold weight of the
shared buer space is 10.
Command Modes DCB-BUFFER-THRESHOLD mode
Command History
Version Description
9.7(0.0) Introduced on the S6000-ON and Z9500.
9.3(0.0) Introduced on the S4810, S4820T, S6000, and MXL platforms.
Usage Information
You must apply this buer policy at the interface level for the attributes to be applicable in conjunction with
the DCB input policy.
For each QoS policy buer, you can specify the shared buer threshold limit, the ingress buer size, buer
limit for pausing the acceptance of packets, and the buer oset limit for resuming the acceptance of
received packets. When PFC detects congestion on a queue for a specied priority, it sends a pause frame
for the 802.1p priority trac to the transmitting device.
You can use set up both the administrative and peer-related PFC priorities. For example, you can congure
the intended buer conguration for all 8 priorities. If you congure the number of lossless queues as 4 and
if the administrator-congured priorities congured within the DCB input policy is applied, then the
conguration for those priorities are pre-designed. However, if the peer-provided priorities are applied,
466
Data Center Bridging (DCB)