Connunitglobalid - HP StorageWorks 2/64 - Core Switch Reference Manual

connUnitGlobalId

OID
Description
Note
218 FibreAlliance MIB objects
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)
Using 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 via 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 must not 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 HP implementation maps the switch WWN to the top 8 octets of this
variable and sets the remaining lower 8 octets to 0.
Example:
If the HP 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