FAQ-How to swap CE6800 istack DC switches without business impact

Publication Date:  2014-09-11 Views:  822 Downloads:  0
Issue Description
Maintaining the new system is quite easy, there is no big difference between a singular switch and istack system. The only point where you can encounter some difficulties is when you need to replace member switches and keep service running without impacting business.
To clarify this point I would like to share a best practice guide that could guaranty no impact for running services.
Let’s consider the below stack system with switch1 and switch2 working as master and slave. 


Alarm Information
none.
Handling Process
How to do it?
1. Replace switch2 (slave)
·         turn off switch2
·         label cables
·         unplug cables and de-rack
·         rack new switch2
·         power up (leave all network cables unplugged)
·         configure switch2 (same as the before one)
o   sysname switch2
o   commit
o   stack
o   stack renumber 2 inherit-config
o   stack domain 10
o   quit
o   commit
o   interface stack-port 2/1
o   port member-group interface 40ge 2/0/1 to 2/0/2
o   quit
o   commit
o   quit
o   save
o   power off
·         plug in 40g stack cables
·         power up the new switch2
·         check stack configs
o   display stack
o   diplay stack topology
o   diplay stack config
o   WAIT FOR ‘DISPLAY STACK’ TO SHOW MASTER/STANDBY
·         plug in all remaining cables
·         check connection
·         save


2. Replace switch1 (master)
·         failover firewall/router/
·         power down via power switch switch1 (have ping -t running across switch to ensure no loss of service)
·         check stack (switch2 should now be master)
o   display stack
·         label cables
·         unplug cables and de-rack
·         rack new switch1
·         power up (leave all network cables unplugged)
·         configure switch1 (same as the before one)
o   sysname switch1
o   commit
o   stack
o   stack renumber 1 inherit-config
o   stack member priority 150
o   stack domain 10
o   quit
o   commit
o   interface stack-port 1/1
o   port member-group interface 40ge 1/0/1 to 1/0/2
o   quit
o   commit
o   quit
o   save
o   power off
·         plug in 40g stack cables
·         power up the new switch1
·         check stack configs
o   diplay stack
o   diplay stack topology
o   diplay stack config
o   switch2 should still be master
·         check stack
·         failover firewall/router
·         restart via power switch switch2 (have ping -t running across switch to ensure no loss of service)
·         check stack configuration
o   display stack
o   diplay stack topology
o   diplay stack config
o   switch1 should be master again, switch2 should be standby
·         save
Root Cause
none.
Suggestions
none.

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