Replacing an IMM-only node with another node

About this task

In this scenario, it is assumed that the IMM-only node has failed and needs to be replaced. The replacement node can be a new node from the factory or a node that has been previously used as an IMM node in another VC. In the former case, the procedure is similar to adding a node received from factory; see First time manual boot of nodes in the stack starting at step 9.

The SD card used to boot the node must contain a version of the TiMOS image (boot.tim) that matches that of the active CPM. If the version do not match, the boot will not be successful.

If a ring of stacking ports is not configured, any failure in the stack (either a link or node failure) will isolate some nodes off of the stack, affecting all the services on those nodes. In addition, if the uplink is available through one of the nodes that is now isolated or failed, services using the uplink for the entire VC are affected.

The following procedure assumes a ring is configured and that the replacement node had been previously used as an IMM node in another VC:

Procedure

  1. Disconnect the stacking port of the failed IMM-only node.
  2. Connect to the console of the active CPM node.
  3. On the active CPM node, use the no vc-stack-node command to remove the failed IMM-only node configuration from the configuration file of the active CPM.
  4. On the active CPM node, add the configuration for the new IMM-only node using the config>system>vc-stack>vc-stack-node command, specifying the MAC address of the new IMM-only node and reusing the same slot number as the failed IMM-only node.
  5. Connect to the console of the replacement IMM node.
  6. Connect the new IMM node to the stacking ring.
  7. Reboot the IMM node by toggling the power to it
  8. On boot up, interrupt the boot process and specify imm-only for the vc-stack-node-type boot loader.
  9. Save the BOF configuration and let the boot proceed.
    Expected outcome

    The node will boot up as an IMM-only node. The appropriate stack LED on the front panel of the node will glow steady.

Expected outcome

Services are not interrupted, as the active CPM (CPM-A) is present and has not been rebooted (assuming the active CPM has an uplink to the network). If one of the IMM-only nodes is converted to a CPM-IMM node, the services on that IMM node are affected as the node is rebooted to effect the change to a CPM-IMM node.

Parent topic: Replacing and upgrading a node in a VC