Brocade FastIron Ethernet Switch Administration Guide - Manual (Page 70)

To change the thresholds for all 10G ports, enter a command such as the following.
device(config)# symmetric-flow-control set 2 xoff 91 xon 75
In the above configuration examples, when the XOFF limit of 91% is reached or exceeded, the
Brocade device will send PAUSE frames to the sender telling it to stop transmitting data temporarily.
When the XON limit of 75% is reached, the Brocade device will send PAUSE frames to the sender
telling it to resume sending data.
Syntax: symmetric-flow-control set { 1 | 2 } xoff % xon %
symmetric-flow-control set 1 sets the XOFF and XON limits for 1G ports.
symmetric-flow-control set 2 sets the XOFF and XON limits for 10G ports.
For xoff % , the % minimum value is 60% and the maximum value is 95%.
For xon % , the % minimum value is 50% and the maximum value is 90%.
Use the show symmetric command to view the default or configured XON and XOFF thresholds.
Refer to
Displaying symmetric flow control status on page 70.
Changing the total buffer limits
This section describes how to change the total buffer limits described in About XON and XOFF
thresholds on page 68. You can change the limits for all 1G ports and for all 10G ports.
To change the total buffer limit for all 1G ports, enter a command such as the following.
device(config)# symmetric-flow-control set 1 buffers 320
Total buffers modified, 1G: 320, 10G: 128
To change the total buffer limit for all 10G ports, enter a command such as the following.
device(config)# symmetric-flow-control set 2 buffers 128
Total buffers modified, 1G: 320, 10G: 128
Syntax: symmetric-flow-control set { 1 | 2 } buffers value
symmetric-flow-control set 1 buffers value sets the total buffer limits for 1G ports. The default value is
272. You can specify a number from 64 - 320.
symmetric-flow-control set 2 buffers value sets the total buffer limits for 10G ports. The default value is
416. You can specify a number from 64 - 1632.
Use the show symmetric command to view the default or configured total buffer limits. Refer to
Displaying symmetric flow control status on page 70.
Displaying symmetric flow control status
The show symmetric-flow-control command displays the status of symmetric flow control as well as
the default or configured total buffer limits and XON and XOFF thresholds.
device(config)# show symmetric
Symmetric Flow Control Information:
-----------------------------------
Symmetric Flow Control is enabled on units: 2 3
Buffer parameters:
1G Ports:
Total Buffers : 272
XOFF Limit : 240(91%)
XON Limit : 200(75%)
10G Ports:
Total Buffers : 416
Changing the total buffer limits
70 FastIron Ethernet Switch Administration Guide
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