Service Manual

For each QoS policy buffer, you can specify the shared buffer threshold limit, the
ingress buffer size, buffer limit for pausing the acceptance of packets, and the buffer
offset limit for resuming the acceptance of received packets. When PFC detects
congestion on a queue for a specified priority, it sends a pause frame for the 802.1p
priority traffic to the transmitting device.
You can use set up both the administrative and peer-related PFC priorities. For
example, you can configure the intended buffer configuration for all 8 priorities. If you
configure the number of lossless queues as 4 and if the administrator-configured
priorities configured within the DCB input policy is applied, then the configuration for
those priorities are pre-designed. However, if the peer-provided priorities are applied,
although a DCB input policy is present, the peer-provided priorities become effective
for buffer configuration. This method of configuration provides an easy and flexible
technique to accommodate both administratively-configured and peer-configured
priorities.
Example
Dell(conf)# qos-policy-buffer test
Dell(conf-qos-policy-buffer)#queue 0 pause no-drop buffer-size
128000 pause-threshold 103360 resume-threshold 83520
Dell(conf-qos-policy-buffer)# queue 4 pause no-drop buffer-size
128000 pause-threshold 103360 resume-threshold 83520
dcb-policy buffer-threshold (Interface
Configuration)
Assign the DCB policy to the DCB buffer threshold profile on interfaces. This setting takes precedence over
the global buffer-threshold setting.
Syntax
dcb-policy buffer-threshold profile-name
Parameters
buffer-threshold Configure the profile name for the DCB buffer threshold
profile-name Enter the name of the profile, which can be a string of up to 32
characters in length.
Default None
Command Modes INTERFACE mode
Command History
This guide is platform-specific. For command information about other platforms, see
the relevant Dell Networking OS Command Line Reference Guide.
Version Description
9.8(1.0) Introduced on the Z9100–ON.
Data Center Bridging (DCB) 639