HP StorageWorks 8/80 Brocade Fabric OS MIB Reference Guide v6.2.0 (53-1001156- - Page 903

connUnitGlobalId 1.3.6.1.3.94.1.6.1.2 8 connUnitGlobalId 1.3.6.1.3.94.1.6.1.2 An optional global-scope identifier for this connectivity unit. It must be a WWN for this connectivity unit or 16 octets of value 0. The following characteristics are required. • WWN formats requiring fewer than 16 octets must be extended to 16 octets with trailing 0 octets. • If a WWN is used for connUnitId, the same WWN must be used for connUnitGlobalId. When a non-zero value is provided, the following characteristics are strongly recommended. • It should be persistent across agent and unit resets. • It should be globally unique. • It should be one of these FC-PH/PH3 formats: - IEEE (NAA=1) - IEEE Extended (NAA=2) - IEEE Registered (NAA=5) - IEEE Registered extended (NAA=6) Use of the IEEE formats allows any IEEE-registered vendor to assure global uniqueness independently. The following are some references on IEEE WWN formats: http://standards.ieee.org/regauth/oui/tutorials/fibreformat.html http://standards.ieee.org/regauth/oui/tutorials/fibrecomp_id.html If one or more WWNs are associated with the connUnit through other management methods, one of them should be used for connUnitGlobalId. If a WWN is not assigned specifically to the connUnit, there is some merit to using a WWN assigned to (one of) its permanently attached FC/LAN interfaces. This cannot risk uniqueness, though. As a counterexample, if your agent runs in a host and the host has an HBA, it is quite possible that agent, host, and HBA are all distinct connUnits, so the host and agent cannot use the WWN of the HBA. If your hub has a built-in Ethernet port, it might be reasonable for the hub to use its LAN address (prefixed with the appropriate NAA) as its connUnitId. But if the Ethernet is a replaceable PCCard, the hub should have an independent ID. The Brocade implementation maps the switch WWN to the top 8 octets of this variable and sets the remaining lower 8 octets to 0. Example: If Brocade's switch WWN is 10:0:0:60:69:10:02:18, then use the SNMP GET command on connUnitGlobalId.10.0.0.60.69.10.02.18.0.0.0.0.0.0.0.0 returns: 10 00 00 60 69 10 02 18 00 00 00 00 00 00 00 00 Fabric OS MIB Reference 887 53-1001156-01