Dell 7000 Series manual Adding a Stack Member with Minimal Interruption

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Stacking Dell PowerConnect 7000 Series Switches

Adding a Stack Member with Minimal Interruption

When adding a new member to a stack, make sure that only the stack cables and no host-facing network cables are connected before powering up the new unit. Make sure the end-user links are not connected to any ports on the unit being added and the new member is powered off. This is important because if STP is enabled and any links are UP, then Spanning Tree Protocol (STP) re-convergence will take place as soon as the link is detected.

After the stack cables on the new member are connected to the stack, connect the switch power. Do not connect another switch to the stack until the existing members are powered up. Also, do not connect two functional, powered-up stacks together. If two functional, powered-up stacks are connected together or connect a powered-up new member to the stack, then master re-election takes place, which causes the stack that no longer has a master to reboot. See “Merging Two Operational Stacks” for more details.

An “unassigned unit” is a switch that is preconfigured to be a member of a stack, but has not been physically connected to the stack. If there are any unassigned units already configured on the stack, remove them prior to adding a new unit to stack. This is important because when there is any preconfigured unit and the master holds some configuration for that unit, as soon as the new unit is detected, the configuration is applied, which might trigger the re-convergence or startup of many other protocols. However, it is possible to intentionally pre-configure a unit. The preconfigured/unassigned units can be viewed by using the show switch CLI command shown below.

The following example shows how to view the units in the stack and remove an unassigned unit:

console#show switch

SW

Management

Standby

Preconfig

Plugged-in

Switch

Code

Status

Status

Model ID

Model ID

Status

Version

---

---------- --------- ------------- ------------- ------------- ----------

1

Mgmt Sw

 

PCT7048P

PCT7028P

OK

4.0.0.6

2

Unassigned

 

PCT7028P

 

Not Present

0.0.0.0

console#configure

console(config)#stack console(config-stack)#no member 2 console(config-stack)#exit console(config)#exit

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Contents Stacking Dell PowerConnect Series Switches Dell Technical White PaperStacking Dell PowerConnect 7000 Series Switches Contents Introduction ApplicabilityStacking and Management Stacking and Performance Stacking and RedundancyDual Stacking Modules Configured in a Ring Mixing M6348 and PC7000 Series Switches in a Stack Power-Up Sequencing ConsiderationsConsole#boot auto-copy-sw allow-downgrade Initial Installation and Power-up of a Stack Selecting the Master Unit Selecting the Standby UnitAutomatic Update Updating the Firmware on a StackManual Update Creating a Separate Vlan for File Downloads FTPFrom the Switching Vlan Vlan Membership page, click Add Navigate to the Routing IP IP Interface Configuration Page Stacking Dell PowerConnect 7000 Series Switches Click Apply Adding a Stack Member with Minimal Interruption Removing a Stack Member with Minimal Interruption Merging Two Operational Stacks Master FailoverEffect of Master Failover on PoE Devices Stack Member Failover Failover ScenariosScenario Stack Split Stack Split with Manager Failure Nonstop Forwarding Initiating a Warm Failover of the Manager Unit Nonstop Forwarding ScenarioNonstop Forwarding Example NSF Scenario Configuration via CLI RouterStack Switch Switch NSF Example NSF Re-convergence Timing Parameter TimingStacking CLI Commands Small ConfigurationStacking Web Interface Summary
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