Use the buffers global configuration command to make adjustments to initial buffer pool settings and to the limits at which temporary buffers are created and destroyed. Use the no form of this command to return the buffers to their default size.
buffers {small | middle | big | verybig | large | huge | typenumber}{permanent | max-free
| min-free | initial } number
no buffers {small | middle | big | verybig | large | huge | typenumber}{permanent | max-free
| min-free | initial } number
small Buffer size of this public buffer pool is 104 bytes.
middle Buffer size of this public buffer pool is 600 bytes.
big Buffer size of this public buffer pool is 1524 bytes.
verybig Buffer size of this public buffer pool is 4520 bytes.
large Buffer size of this public buffer pool is 5024 bytes.
huge Default buffer size of this public buffer pool is 18024 bytes. This value can be configured with the buffers huge sizecommand.
type number Interface type and interface number of the interface buffer pool. The type value cannot be fddi .
permanent Number of permanent buffers that the system tries to create and keep. Permanent buffers are normally not trimmed by the system.
max-free Maximum number of free or unallocated buffers in a buffer pool.
A maximum of 20,480 small buffers can be constructed in the pool.min-free Minimum number of free or unallocated buffers in a buffer pool.
initial Number of additional temporary buffers that are to be allocated when the system is reloaded. This keyword can be used to ensure that the system has necessary buffers im mediately after reloading in a high-traffic environment.
number Number of buffers to be allocated.
The default number of buffers in a pool is determined by the hardware configuration and can be displayed with the EXEC show buffers command.
Global configuration
| Release | Modification | 10.0 | This command was introduced. |
|---|
Normally you need not adjust these parameters; do so only after consulting with technical support personnel. Improper settings can adversely impact system performance.
You cannot configure FDDI buffers.
The following example keeps at least 50 small buffers free in the system:
buffers small min-free 50
The following example increases the permanent buffer pool allocation for big buffers to 200:
buffers big permanent 200
A general guideline is to display buffers with the show bufferscommand, observe which buffer pool is depleted, and increase that one.
The following example increases the permanent Ethernet 0 interface buffer pool on a Cisco 4000 is 96 because the Ethernet 0 buffer pool is depleted:
buffers ethernet 0 permanent 96
| Command | Description |
|---|---|
| load-interval | Changes the length of time for which data is used to compute load statistics. |
| show buffers | Displays statistics for the buffer pools on the network server. |
Printed for apswan@ctr.ap.nic.in on Wed Mar 5 22:32:57 PST 2003
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