Users Guide

Input Output Aggregator Module
You can view details of the IOM and Flex Modules on the CMC RACADM, and Chassis Health, I/O Module Status, and I/O Module
Overview pages.
CMC reports information about the ex modules in the IOA by reading the ex module information during its initial negotiation with
the IOA. The reading happens by sending XML commands during the initial negotiation. CMC saves the ex module information in
the shared memory. There can be a maximum of two ex modules:
• FlexIO Module 1
• FlexIO Module 2
All IOM software that support the command revision 4 support the Flex IO module information XML command. CMC sends the ex
module information only if the command revision is 4 or later. Any failure to read the ex module information is stored in the Chassis
Log.
The ex module information can have the following ve values:
• 4x10G Base-T FlexIO Module = 0
• 4x10G SFP+ FlexIO Module = 1
• 2x40G QSFP+ FlexIO Module = 2
• 4xFC FlexIO Module = 3
• No ex module installed = 4
Any value greater than 4 is considered invalid. CMC displays as “Invalid/Unknown” ex module.
The modes of the IOM are as follows:
• Standalone
• VLT
• Stacking
• PMux
• Full Switch
You can view the IOM mode as a tool tip when you select IOM on the Chassis Health, I/O Module Status, and I/O Module
Overview pages.
While changing the mode of an IOA that has a static IP, from stacking to standalone, ensure that the network for the IOA is changed
to DHCP. Else, the static IP is duplicated on all the IOAs.
When the IOMs are in stacking mode, the stack ID is the same as the master IOM burned in the MAC during the initial power-on.
The stack ID does not change when the IOM modes change. For example, during initial power-on, if switch-1 is the master, the mac
address of the stack is identical to that of the switch-1 burned in the MAC address. Later, when switch-3 is the master, the switch-1
MAC address is retained as the stack ID.
The racadm command, getmacaddress, displays I/F MAC, which is burned in MAC address + 2.
Managing VLAN for IOM
Virtual LANs (VLANs) for IOMs allow you to separate users into individual network segments for security and other reasons. By
using VLANs, you can isolate the networks for individual users on a 32–port switch. You can associate selected ports on a switch
with selected VLAN and treat these ports as a separate switch.
CMC Web Interface allows you to congure the in-band management ports (VLAN) on the IOMs.
After the mode of the I/O Aggregator is changed to standalone from stacking, remove the startup conguration and reload the I/O
Aggregator. You need not save the system conguration while reloading the I/O Aggregator.
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