Each Brocade VDX 8770-4 and VDX 8770-8 contains two chassis ID cards (CIDs) called CD1 and CD2.
Most data on each card is identical, and CID2 is used only as a backup if CID1 encounters an issue.

The data contained on the CID card is essential for correct operation of the switch and is accessed
most frequently during system startup.

Each CID contains two serial electronically erasable programmable read-only memory (SEEPROM)
devices:

• Critical SEEPROM. This SEEPROM is read-only.
• Noncritical SEEPROM. This SEEPROM can be written to by the software.

Critical SEEPROM data

The critical SEEPROM contains the following:

• A header with the CID part number, serial number, and other data about the CID card. If this data is

corrupted or cannot be accessed, the card is identified as faulty in RASLogs:

‐

[EM-1003], M1 | FFDC, CRITICAL, …, CID 2 has unknown hardware identifier: FRU faulted.

‐

[FW-1432], M1, WARNING, sw0, Switch status change contributing factor CID-Card: 1 bad.

• A chassis part number and serial number. Cluster configuration management uses the serial number

to uniquely identify the chassis in the fabric.

• An eight-byte number that represents both the license ID and World Wide Name (WWN) base value

for the chassis. The license ID is used to validate installed licenses. Licenses are invalid if the license
ID is not available. The WWN is used to identify the switch in a fabric.

Noncritical SEEPROM data

The noncritical SEEPROM contains the following data sets.

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