Dell Brocade VDX 6740 User manual

Brocade VDX 6740
Switch Configuration Guide for EqualLogic SANs
Dell Storage Engineering
January 2015

2 SCG1020 | Brocade VDX 6740 Switch Configuration Guide for EqualLogic SANs
Revisions
© 2015 Dell Inc. All rights reserved. Reproduction of this material in any manner whatsoever without the express written permission of Dell Inc. is
strictly forbidden. For more information, contact Dell.
Dell, the Dell logo, and the Dell badge and EqualLogic are trademarks of Dell Inc. Brocade® is a registered trademark of Brocade Communication
Systems, Inc. and/or its affiliates in the U.S. and other countries.
Date
Description
January 2015
Initial release

3 SCG1020 | Brocade VDX 6740 Switch Configuration Guide for EqualLogic SANs
Table of contents
Revisions..................................................................................................................................................................................................2
1Introduction.................................................................................................................................................................................... 4
1.1 Audience............................................................................................................................................................................... 4
1.2 Switch details....................................................................................................................................................................... 4
1.3 Cabling diagram...................................................................................................................................................................5
2Dell recommended switch configuration................................................................................................................................ 6
2.1 Hardware configuration.................................................................................................................................................... 6
2.2 Delete startup configuration............................................................................................................................................ 6
2.3 Configure Port Channel.....................................................................................................................................................7
2.4 Configure Ports for LAG.....................................................................................................................................................7
2.5Configure Global LLDP settings to disable DCB ..........................................................................................................7
2.6 Disable Ethernet Fabric on edge ports ...........................................................................................................................7
2.7 Enable Jumbo MTU ........................................................................................................................................................... 8
2.8 Enable Switchport .............................................................................................................................................................. 8
2.9 Enable link level flow control (802.3x)........................................................................................................................... 8
2.10 Configure Spanning tree on edge ports........................................................................................................................ 8
2.11 Disable LLDP iSCSI priority on Switch Ports................................................................................................................. 8
2.12 Save configuration ............................................................................................................................................................. 8
2.13 Configure additional switch............................................................................................................................................. 8
3Performance Tuning..................................................................................................................................................................... 9
4Configuring VCS ID and Rbridge-ID ....................................................................................................................................... 10
Additional resources ........................................................................................................................................................................... 11

4 SCG1020 | Brocade VDX 6740 Switch Configuration Guide for EqualLogic SANs
1Introduction
This document illustrates how to configure the Brocade VDX 6740 switch for use with EqualLogic™PS
Series storage using Dell™best practices. The recommended configuration uses Brocade link aggregation
groups (LAGs) for inter-switch connections.
For more information on EqualLogic SAN design recommendations, see the EqualLogic Configuration
Guide at: www.delltechcenter.com/page/equallogic+configuration+guide.
1.1 Audience
This switch configuration guide describes a verified configuration following Dell best practices for an
EqualLogic iSCSI SAN and is intended for storage or network administrators and deployment personnel.
1.2 Switch details
The table below provides an overview of the switch configuration.
Table 1 Switch specifications
Brocade VDX 6740
Switch vendor
Brocade
Switch model
VDX 6740
Switch firmware
NOS 5.0.1
Note: For proper functionality, the switch must be at the firmware version shown in the table above
before proceeding with this configuration. Using previous firmware versions may have unpredictable
results.
The latest firmware updates and documentation can be found at: http://www.brocade.com. This site
requires a login.

5 SCG1020 | Brocade VDX 6740 Switch Configuration Guide for EqualLogic SANs
1.3 Cabling diagram
The cabling diagram shown below represents the Dell recommend method for deploying your servers and
EqualLogic arrays.
Figure 1 Cabling diagram

6 SCG1020 | Brocade VDX 6740 Switch Configuration Guide for EqualLogic SANs
2Dell recommended switch configuration
These steps show how to configure two Brocade VDX 6740 switches with a Brocade proprietary LAG
interconnect. The switches are interconnected using two 40Gb ports configured as the LAG links. 40G
Port Upgrade license is required to use the 40G uplinks.
Note: The configuration steps in this section are only recommended when the switch is used as a
dedicated SAN for iSCSI traffic (not shared with any other traffic type).
2.1 Hardware configuration
1. Power on both switches
2. Connect a serial cable to the management port.
3. Using any terminal utility, open a serial connection session to the switch.
4. Open your terminal emulator and configure it to use the serial port (usually COM1 but this may
vary depending on your system). Configure serial communications for 9600,N,8,1 and no flow
control.
5. Connect the cables between switch 1 and switch 2 as shown in Figure 1. This will be used as your
Brocade LAG link.
Note: The below configuration steps assumes that the switch is configured with a unique Rbridge-id and
VCS id. The LAG interconnection will fail to come up if the Rbridge-id or VCS id is conflicting. Refer to
Section 4 on how to change the Rbridge-id and VCS id of the switch.
2.2 Delete startup configuration
Note: This example assumes a switch at its default configuration settings. Using the “copy default-config
startup-config” command sets the startup configuration file to its default settings. You should always
backup your configuration settings prior to performing any configuration changes.
sw0# copy default-config startup-config
This operation will modify your startup configuration. Do you want to continue?
[y/n]:y
WARN: "reload system" is required to have configuration changes take effect!
sw0# reload system
Warning: This operation will cause the chassis to reboot and
requires all existing telnet, secure telnet and SSH sessions to be
restarted.
Are you sure you want to reboot the chassis [y/n]? y
Note: The switch will reboot.

7 SCG1020 | Brocade VDX 6740 Switch Configuration Guide for EqualLogic SANs
2.3 Configure Port Channel
sw0#configure
Entering configure mode terminal
sw0(config)# interface Port-channel 1
sw0(config-Port-channel-1)# mtu 9216
sw0(config-Port-channel-1)# switchport
sw0(config-Port-channel-1)# switchport mode trunk
sw0(config-Port-channel-1)# qos flowcontrol tx off rx on
sw0(config-Port-channel-1)# speed 40000
sw0(config-Port-channel-1)# no shutdown
sw0(config-Port-channel-1)# exit
2.4 Configure Ports for LAG
sw0(config)# interface FortyGigabitEthernet 1/0/49-50
sw0(conf-if-fo-1/0/49-50)# no fabric isl enable
sw0(conf-if-fo-1/0/49-50)# no fabric trunk enable
sw0(conf-if-fo-1/0/49-50)# channel-group 1 mode active type brocade
sw0(conf-if-fo-1/0/49-50)# no cee
sw0(conf-if-fo-1/0/49-50)# no lldp disable
sw0(conf-if-fo-1/0/49-50)# no shutdown
sw0(conf-if-fo-1/0/49-50)# exit
2.5 Configure Global LLDP settings to disable DCB
The below commands are issued to disable dcbx-tlv and iscsi-app tlv.
sw0(config)#protocol lldp
sw0(conf-lldp)#no advertise dcbx-iscsi-app-tlv
sw0(conf-lldp)#no advertise dcbx-tlv
sw0(conf-lldp)#exit
2.6 Disable Ethernet Fabric on edge ports
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# no fabric isl enable
sw0(conf-if-te-1/0/1-48)# no fabric trunk enable
sw0(conf-if-te-1/0/1-48)# exit

8 SCG1020 | Brocade VDX 6740 Switch Configuration Guide for EqualLogic SANs
2.7 Enable Jumbo MTU
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# mtu 9216
sw0(conf-if-te-1/0/1-48)# exit
2.8 Enable Switchport
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# switchport
sw0(conf-if-te-1/0/1-48)# switchport mode access
sw0(conf-if-te-1/0/1-48)# exit
2.9 Enable link level flow control (802.3x)
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# qos flowcontrol tx off rx on
sw0(conf-if-te-1/0/1-48)# exit
2.10 Configure Spanning tree on edge ports
sw0(config)#protocol spanning-tree rstp
sw0(config-rstp)#exit
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# spanning-tree edgeport
sw0(conf-if-te-1/0/1-48)# exit
2.11 Disable LLDP iSCSI priority on Switch Ports
sw0(config)#interface TenGigabitEthernet 1/0/1-48
sw0(conf-if-te-1/0/1-48)# no lldp disable
sw0(conf-if-te-1/0/1-48)# no cee
sw0(conf-if-te-1/0/1-48)# no lldp iscsi-priority
sw0(conf-if-te-1/0/1-48)# exit
2.12 Save configuration
switch#copy running-config startup-config
2.13 Configure additional switch
Repeat the commands from Sections 2.1 through 2.12 to configure the second switch.

9 SCG1020 | Brocade VDX 6740 Switch Configuration Guide for EqualLogic SANs
3Performance Tuning
In our testing of VDX 6740 with EqualLogic and using asymmetric flow control i.e. TX off RX on, the
default buffer allocation of 280KB per port per queue didn’t yield optimum throughput and significant TCP
retransmits were observed. But NOS version 5.0.1 has additional knobs to fine tune the buffers and add
additional buffer per port per queue. The following section shows how to configure the receive and
transmit buffers. Our testing indicated the optimal setting as 2MB for receive queue and 2MB for transmit
queue per port.
sw0# configure
Entering configuration mode terminal
sw0(config)# rbridge-id 1
sw0(config-rbridge-id-1)# qos tx-queue limit 2000
sw0(config-rbridge-id-1)# qos rcv-queue limit 2000
sw0(config-rbridge-id-1)# exit
sw0(config)#
Note: Repeat the commands to configure the buffer on the second switch.

10 SCG1020 | Brocade VDX 6740 Switch Configuration Guide for EqualLogic SANs
4Configuring VCS ID and Rbridge-ID
Refer to Brocade documentation for details on VCS and ethernet fabric. The following commands shows
the steps to configure the rbridge-id and VCS id to 2 on the second switch so that it doesn’t conflict with
the default value of 1 on Switch 1. VDX 6740 is in Fabric Cluster mode by default and configuration change
is not required for the mode.
sw0# show vcs
Config Mode : Local-Only
VCS Mode : Fabric Cluster
VCS ID : 1
Total Number of Nodes : 1
Rbridge-Id WWN Management IP VCS Status
Fabric Status HostName
--------------------------------------------------------------------------------
------------------------------
2 >10:00:50:EB:1A:2D:F2:64* 77.77.77.77 Online
Online sw0
sw0# vcs vcsid 2
This operation will change the configuration to default and reboot the switch.
Do you want to continue? [y/n]:y
Note: The switch will reboot.
sw0# vcs rbridge-id 2
This operation will change the configuration to default and reboot the switch.
Do you want to continue? [y/n]:y
Note: The switch will reboot.

11 SCG1020 | Brocade VDX 6740 Switch Configuration Guide for EqualLogic SANs
Additional resources
Support.dell.com is focused on meeting your needs with proven services and support.
DellTechCenter.com is an IT Community where you can connect with Dell Customers and Dell employees
for the purpose of sharing knowledge, best practices, and information about Dell products and your
installations.
Referenced or recommended Dell publications:
Dell EqualLogic Configuration Guide:
http://en.community.dell.com/techcenter/storage/w/wiki/equallogic-configuration-guide.aspx
Dell EqualLogic Compatibility Matrix:
http://en.community.dell.com/techcenter/storage/w/wiki/2661.equallogic-compatibility-
matrix.aspx
For EqualLogic best practices white papers, reference architectures, and sizing guidelines for enterprise
applications and SANs, refer to Storage Infrastructure and Solutions Team Publications at:
http://dell.to/sM4hJT