Configure CMCs for Identical Addresses

Each CMC has two IP addresses, an active state IP address used when the CMC is active, and a backup state IP address used when the CMC is inactive. For ease of management console operation, the active state IP addresses of both CMCs should be the same. An advantage of identical active state IP addresses is that the network management console will always log into the active CMC.

This procedure assumes that both CMCs are currently configured.

Access the inactive CMC from its serial management port.
Log in, then invoke a reboot of the CMC:
```
# reboot
```
The CMC reboots.
When you see the following output, press any key to stop the boot process:
```
hit any key to stop autoboot
```
The boot monitor prompt is displayed.
```
shmm1500
```
Set the backup state IP address of the CMC:
```
shmm1500 setenv ipaddr backup_IP_address
```
where backup_IP_address is the backup state IP address common to both CMCs.

Note - Setting the backup state IP addresses of both CMCs to the same value causes a reallocation according to this rule: If the backup_IP_address is odd, then it is assigned to CMC1 and CMC0 is assigned backup_IP_address+1. If the backup_IP_address is even, then it is assigned to CMC0 and CMC1 is assigned backup_IP_address +1
Save the configuration and continue booting the switch:
```
shmm1500 saveenv 
shmm1500 boot
```
The switch boots.
Log into the CMC and set the active state IP address for the CMC:
```
# clia setlanconfig 1 3 active_IP_address
```
where active_IP_address is the active state IP address common to both CMCs.
Perform a switchover:
```
# clia switchover
```
If the common backup state IP address or common active state IP address is new to both CMCs, repeat Step 1 to Step 7 for the other CMC.
CMC0 and CMC1 now share the same active state IP address. Should one CMC become inactive, the second CMC is reachable at the same active state IP address.

Related Information

Switch Installation, powering on the switch
Reperform Initial Setup

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Sun Datacenter InfiniBand Switch 648 Topic Set