hardware shared-buffer-size

To configure the shared buffer size for a Cisco Nexus 2000 Series Fabric Extender, use the hardware shared-buffer-size command. To revert to the default setting, use the no form of this command.

hardware fex_card_type shared-buffer-size [ buffer-size ]

no hardware fex_card_type shared-buffer-size [ buffer-size ]

Syntax Description

fex_card_type
Fabric Extender card type. The following Fabric Extender card types are supported:
  • N2248TP-E —Fabric Extender 48x1G 4x10G SFP+ Module
See the "Usage Guidelines" section for a description of this Fabric Extender.
buffer-size
(Optional) Shared buffer size (KB). The range is from 10800KB to 25392KB.

Command Default

The default size of the shared buffer is 25392KB.

Command Modes

Fabric Extender configuration mode

Command History

Release
Modification
5.1(3)N1(1)
This command was introduced.
The Cisco Nexus N2248TP-E Fabric Extender was introduced.

Usage Guidelines


Note This command is supported only on a Cisco Nexus 2248TP-E Fabric Extender.


The Cisco Nexus N2248TP-E Fabric Extender has four 10-Gigabit Ethernet fabric interfaces for its uplink connection to the parent Cisco Nexus 5000 Series switch and 48 1000BASE-T (1-Gigabit) Ethernet host interfaces with small form-factor pluggable (SFP+) interface adapters for its downlink connection to servers or hosts.

The total available buffer is 32MB which is shared in both direction (ingress, egress).

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 10800KB. 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.

Examples

This example shows how to configure the hardware buffer size on a Cisco Nexus 2248TP-E Fabric Extender:

switch# configure terminal
switch(config)# fex 100
switch(config-fex)# hardware N2248TTP-E shared-buffer-size 25000
switch(config-fex)#
 

This example shows how to remove the hardware pause no-drop configuration between a Cisco Nexus 2248TTP-E Fabric Extender and a switch:

switch# configure terminal
switch(config)# fex 100
switch(config-fex)# no hardware N2248TTP-E shared-buffer-size 25000
switch(config-fex)#
 

Related Commands

Command
Description
fex
Creates a Fabric Extender and enters fabric extender configuration mode.
show fex
Displays all configured Fabric Extender chassis connected to the switch.
show running-config fex
Displays the running configuration for Fabric Extenders.