Automatically Adding or Replacing Nodes in a Stack

You can easily automatically add or replace nodes in an existing stack.

Important

You can only replace a switch with the same switch model, or with a model from the same switch series (family) with the same number of ports, but a different port type. For example, you can replace an ExtremeSwitching 5420F-24T-4XE with an ExtremeSwitching 5420-24P-4XE (24T → 24P).

Connecting a new node to a stack automatically triggers the following tasks in a stack:

Adds New Nodes—When a new switch is connected to a stack, the switch is automatically:
1. Configured with the proper stacking support parameters needed to bring up either native or alternate stack ports. This automatic configuration (auto-discovery) is supported on 5420 and 5520 switches. All other Universal switches require that you configure stacking support on the stacking ports manually.
2. Assigned the lowest available slot number.
3. Set as stacking master-capability if the stack has only one master-capable switch (the master itself) and the switch is directly connected to the current stack master. Otherwise, the new switch is not made master-capable.
4. Assigned the stack MAC address.
5. Rebooted, which then causes the new node to join the stack.
Incompatible ExtremeXOS Check—Checks for and resolves incompatible ExtremeXOS software versions of stack nodes. If the new switch is running an incompatible version, the version is reconciled by running the synchronize {slot slotid} {file_name} command for that switch causing the new switch to align with the stack master.
Note
You cannot automatically update a switch running ExtremeXOS 30.2 or earlier to ExtremeXOS 30.3 or later due to a file system compatibility issue. If a switch has ExtremeXOS 30.2 or earlier, prior to inserting the switch into the stack topology, you need to manually upgrade the switch (see Upgrading the Software on all Active Nodes).
License Mismatch Check—Checks for and resolves software license mismatches between all master-capable nodes. The following command is issued: configure stacking {node-address node-address | slot slot-number} license-level license_restriction.
Note
License mismatches due to installing feature licenses cannot be resolved automatically. The node is left in the failed state.

To start automatic node replacement:

Prepare the replacement node:
1. If the replacement switch is not out of the shipping box, remove any configuration and restore the factory defaults by running the command unconfigure switch {all | erase [all | nvram]} with the all option.
2. If the replacement switch is going to be the backup node, check for feature license mismatches between it and the master by running show licenses {[slot slot |all]} {detail} on both switches. Install licenses as needed to the replacement node by running the command or;
  install license file filename for universal platforms.
3. Power down the replacement switch.
Remove the current node from the stack.
If you are changing to a different port type (for example, 24T → 24P):
1. On the master, run the command configure slot slot module module_type , and change the module_type as applicable.
2. Save the configuration (save configuration {primary | secondary | existing-config | new-config} ).
Physically connect the new switch to the stack, and power it up. For information about cabling, see the hardware installation guide for your switch.
Configure the switch port and speed for stack communication on the connected port of the new node for ExtremeSwitching Universal switches by running the command configure stacking-support stack-port [stack-ports | all] selection [native {V40 | V80 | V160 | V200 | V320 | V400 {alternative-configuration | help}} | alternate].

To manually add or replace a node, see Manually Adding Nodes to a Stack.