Cisco Nexus 6000 Series - Configuring the Shared Buffer

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No drop class over a distance of 3000 meters between the FEX and switch (FEX global level)
Configuring the Shared Buffer
The following are guidelines for the configuration of the shared buffer:
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Configuring the shared buffer is done at the FEX global level.
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The total available buffer is 32 MB which is shared in both the ingress and egress directions.
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The default size of the shared buffer is 25392KB.
However, when configuring an Ethernet-based pause no-drop class, the shared buffer size changes to
10800 KB. This change is required to increase the dedicated buffer that supports the pause no-drop class.
The pause no-drop class does not use buffer space from the shared-pool.
Performing these commands might result in traffic disruption on all ports.Note
Procedure
PurposeCommand or Action
Enters global configuration mode.configure terminal
Example:
switch# configure terminal
switch(config)#
Step 1
Enters configuration mode for the specified FEX.
fex chassis_id
Step 2
Example:
switch(config)# fex 100
switch(config-fex)#
The range of the chassis_id value is 100 to 199.
Specifies the shared buffer size (KB).hardware N2248TP-E shared-buffer-size
buffer-size
Step 3
The range of the buffer-size value is 10800 KB to
25392 KB.
Example:
switch(config-fex)# hardware
N2248TP-E shared-buffer-size 25000
The hardware N2248TP-E
shared-buffer-size command specifies the
default shared buffer size of 25392 KB.
Note
This example shows how to configure the shared buffer.
switch# configure terminal
switch(config)# fex 100
switch(config-fex)# hardware N2248TP-E shared-buffer-size 25000
switch(config-fex)#
Cisco Nexus 6000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
178
Configuring the Fabric Extender
Configuring the Shared Buffer