Configuring buffer sharing on fcx and icx devices, Fcx buffer sharing levels – Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide User Manual
Page 57
Field definitions for the output of show qd-buffer-profile command
TABLE 12
Field
Description
User Buffer Profile
The name of the user-configurable buffer profile
Port-type
The type of the port: 1 Gbps or 10 Gbps or All
Total Buffers
The total number of buffers allocated to the port
Total Descriptors
The total number of descriptors allocated to the port
Per Queue details
The names of the queues
Buffers
The total number of buffers allocated to the queue
Descriptors
The total number of descriptors allocated to the queue
Configuring buffer sharing on FCX and ICX devices
Network congestion can be caused by various reasons such as port shaping, flow control received on
the link due to congestion on the peer, or oversubscription of the egress line rate.
To support priority queuing, FCX and ICX devices support a configurable amount of guaranteed buffers
and descriptors per (port, queue) pair. For information about guaranteed buffers and descriptors, refer
to
on page 49.
In addition, FCX and ICX devices support configurable shared buffer pools, which help absorb traffic
bursts without packet loss. For a given (port, queue) pair, if its buffer usage exceeds the guaranteed
limit, it will start using buffers in the sharing pool. The shared buffers are apportioned among the 1
Gbps, 10 Gbps, 16 Gbps, and stacking ports.
Buffer sharing is always enabled. You can configure buffer sharing by changing the buffer sharing level.
To configure the buffer sharing level, enter a command similar to the following.
device(config)# qd-share-level 2
Syntax: qd-share-level level
The level variable is the buffer sharing level, which is a decimal valu levele. The range of valid values
for FCX is from 1 to 8. The range of valid values for an ICX 6610 is from 2 through 8.
For descriptions of the buffer sharing levels for FCX devices, refer to
on page
57.
For descriptions of the buffer sharing levels for ICX 6610 devices, refer to
on page 58.
For descriptions of the buffer sharing levels for ICX 6430 and 6450 devices, refer to
on page 59.
FCX buffer sharing levels
The FCX buffer sharing level configures the shared buffers on the device. The following table defines
the FCX buffer sharing level settings. For information about configuring buffer sharing, refer to
Configuring buffer sharing on FCX and ICX devices
on page 57.
Configuring buffer sharing on FCX and ICX devices
FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide
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