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Brocade VDX 6940 Switch Configuration Guide for Dell PS Series SANs | SCG3306 

Dell recommended switch configuration 

These steps show how to configure two Brocade VDX 6940 switches with a Brocade proprietary LAG 
interconnect. The switches are interconnected using two 40Gb ports (35 and 36) configured as the LAG links.  

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 following configuration steps assume 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 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. Always back 

up 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. The default user ID 

and password are “admin” and “password”. 

 

 

Summary of Contents for Brocade VDX 6940

Page 1: ...A Dell Deployment and Configuration Guide Brocade VDX 6940 Switch Configuration Guide for Dell PS Series SANs Dell Storage Engineering October 2016 ...

Page 2: ...AND TECHNICAL INACCURACIES THE CONTENT IS PROVIDED AS IS WITHOUT EXPRESS OR IMPLIED WARRANTIES OF ANY KIND 2016 Dell Inc All rights reserved Dell and the Dell EMC logo are trademarks of Dell Inc in the United States and or other jurisdictions All other marks and names mentioned herein may be trademarks of their respective companies Date Description October 2016 Initial release ...

Page 3: ... ports 7 2 4 Convert 40GbE ports to 10GbE mode 7 2 5 Configure port channel 7 2 6 Configure ports for LAG 7 2 7 Configure global LLDP settings to disable DCB 8 2 8 Disable Ethernet fabric on edge ports 8 2 9 Enable Jumbo MTU 8 2 10 Enable switchport 8 2 11 Enable link level flow control 802 3x 9 2 12 Configure spanning tree on edge ports 9 2 13 Disable LLDP iSCSI priority on switch ports 9 2 14 Sa...

Page 4: ...alic Placeholder or variable your password Italic brackets Separate variables ip address mask 1 2 Audience This switch configuration guide describes a verified configuration following Dell best practices for a PS Series iSCSI SAN and is intended for storage or network administrators and deployment personnel 1 3 Switch details The table below provides an overview of the switch configuration Switch ...

Page 5: ...0 Switch Configuration Guide for Dell PS Series SANs SCG3306 1 4 Cabling diagram The cabling diagram shown in Figure 1 represents the Dell recommend method for deploying your servers and PS Series arrays Cabling diagram ...

Page 6: ...n Figure 1 This will be used as your Brocade LAG link Note The following configuration steps assume 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 to change the Rbridge id and VCS id of the switch 2 2 Delete startup configuration Note This example assumes a switch at its de...

Page 7: ...d 2 5 Configure port channel sw0 configure 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 6 Configure ports for LAG Note For th...

Page 8: ...a show interface status or do show interface status command sw0 config interface TenGigabitEthernet 1 0 1 1 4 sw0 conf if te 1 0 1 1 4 no fabric isl enable sw0 conf if te 1 0 1 1 4 no fabric trunk enable Note For the remainder of this document any actions that are performed on interface TenGigabitEthernet 1 0 1 1 4 must also be performed on the other 4 x 10 edge port interfaces 1 0 2 1 4 1 0 3 1 4...

Page 9: ...conf if te 1 0 1 1 4 spanning tree edgeport Reminder Perform these steps on the other 4 x 10 edge ports 2 13 Disable LLDP iSCSI priority on switch ports sw0 conf if te 1 0 1 1 4 no lldp disable sw0 conf if te 1 0 1 1 4 no cee sw0 conf if te 1 0 1 1 4 no lldp iscsi priority sw0 conf if te 1 0 1 1 4 end Reminder Perform these steps on the other 4 x 10 edge ports 2 14 Save configuration Sw0 copy runn...

Page 10: ...id not yield optimal throughput and significant TCP retransmits were observed The following section shows how to configure the QoS receive buffer Testing indicated the optimal setting is 3MB for the receive queue sw0 configure sw0 config rbridge id 1 sw0 config rbridge id 1 qos rcv queue limit 3000 sw0 config rbridge id 1 end sw0 Note Repeat the commands to configure the buffer on the second switc...

Page 11: ...ault 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 ...

Page 12: ...nnect with Dell Customers and Dell employees for the purpose of sharing knowledge best practices and information about Dell products and your installations Storage Solutions Technical Documents on Dell TechCenter provide expertise that helps to ensure customer success on Dell Storage platforms Referenced or recommended Dell publications Dell PS Series Configuration Guide Dell Storage Compatibility...

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