HP StorageWorks XPath OS 7.4.X MIB Reference Guide (AA-RVHEC-TE, September 2005)

36 FibreAlliance MIB objects
Connectivity Unit Link Table
The connectivity unit link table organizes and communicates information from the agent to assist a
management application to discover the connectivity units in the framework and the topology of their
interconnect. The connectivity unit link table also maps the elements of the framework.
The agent should include all information about links from its own connectivity units to others, including
links among its own units. It also should include partial information about links if it is not able to fully
define them in accordance with the following structure; however, the information must include either a
nonzero connUnitNodeId or a nonzero connUnitPortWwn for each end of the link.
If the agent discovers links that do not directly attach to members of its agency and its discovery algorithm
gives some assurance that the links are recently valid, it can include these links.
Link information entered by administrative action can be included even if not validated directly if the link
has at least one endpoint in this agency; it should not be included otherwise.
A connectivity unit should fill in the link table as best it can. One method is to use the RNID ELS command
(ANSI document 99-422v0), which queries a port for the information needed.
This link table is accessed either directly, if the management software has an index value, or by using the
getnext command. The values of the indexes need not be contiguous. Each entry created in this table is
assigned an index. This relationship is kept persistent until the entry is removed from the table or the
system is reset. The total number of entries is defined by the size of the table.
For an entry to be considered valid, both the X (local unit) and the Y (remote unit) need to have one valid
value.
connUnitLinkTable
OID 1.3.6.1.3.94.1.12
Description A list of links known to this agent from this connectivity unit to other connectivity units. X is
the switch data; Y is the other end of the link.
connUnitLinkEntry
OID 1.3.6.1.3.94.1.12.1
Description An entry describing one link to another.
Index connUnitLinkUnitId
connUnitLinkIndex
connUnitLinkUnitId
OID 1.3.6.1.3.94.1.12.1.1
Description The connUnitId of the connectivity unit that contains this link table.
Note connUnitLinkUnitId is set to the WWN of the local switch.
connUnitLinkIndex
OID 1.3.6.1.3.94.1.12.1.2
Description This index is used to create a unique value for each entry with the same
connUnitLinkUnitId in the link table. The value can be reused only if it is not currently in
use and the value is the next candidate to be used. This value is allowed to wrap at the
highest value represented by the number of bits. It is reset to 0 when the system is reset;
the first value used is 1.