7210 SAS-MXP, R6, R12, S, SX, T BASIC SYSTEM
CONFIGURATION GUIDE RELEASE 22.9.R1
Virtual chassis
• replace a CPM-IMM node or IMM-only node
• upgrade an existing IMM-only node to a CPM-IMM node
• downgrade a CPM-IMM node to an IMM-only node
5.7.1 Replacing a standby/active CPM-IMM node with another CPM-IMM node
About this task
When replacing a node, the SD card used to boot the replacement node must contain a version of the
boot.tim and both.tim images that match that of the active CPM. If the versions do not match, the bootup
will not be successful.
If a VC is configured with only a single CPM-IMM node and that node fails, the entire VC is down, including
the IMM-only nodes. The IMM-only nodes reboot if they do not hear from the active CPM node after some
time.
If the stacking ports are not connected together to form a ring connecting all the nodes of the VC, any
failure in the VC (whether a link or a node failure) will isolate some nodes off of the VC, affecting all the
services on those nodes. In addition, if the uplink is through one of the nodes that has been isolated or
has failed, services using the uplink for the entire VC are affected. The procedure here assumes a ring of
stacking ports is configured.
In the following scenario, it is assumed that a CPM-IMM node has failed and needs to be replaced. It is
assumed that a redundant CPM node is configured and another CPM-IMM node is currently active. The
replacement node might be a new node from the factory or a node that has been previously used as an
IMM node:
Procedure
Step 1. Use the MAC address or slot number to determine whether the failed node is CPM-A or CPM-B.
The node to be added as a CPM-IMM node must be configured based on which one failed. For
the purposes of this example, it is assumed that CPM-B (the standby CPM) has failed.
Step 2. Disconnect the stacking port on the failed node and complete the stacking ring.
Step 3. On the active CPM, remove the configuration of the failed CPM-IMM node (CPM-B) from the
BOF using the bof no vc-stack-node command.
Step 4. On the active CPM, add the configuration of the new CPM-IMM node as CPM-B to the BOF using
the bof vc-stack-node command.
Step 5. Save the BOF for the configuration to take effect immediately.
Step 6. If the replacement node is an existing IMM-only node, follow these steps:
a. Remove the IMM-only node configuration from the configuration file of the active CPM using
the config system vc-stack no vc-stack-node command.
b. Connect to the console of the IMM-only node.
c. Reboot the node by toggling the power button.
d. On boot up, interrupt the boot process and configure the node as CPM-IMM (CPM-B) by
configuring the following BOF parameters:
• specify cpm-imm for vc-stack-node-type
• specify the slot number and MAC address of each CPM-IMM node in the bof>vc-stack-
node command
3HE 18197 AAAB TQZZA
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