FW V06.XX/HAFM SW V08.02.00 HP StorageWorks SNMP Reference for Directors and Edge Switches (AA-RQ7BE-TE, July 2004)

SNMP Support
112 SNMP Reference for Directors and Edge Switches
Link Table
The link table is intended to organize and communicate any information to the
agent which would assist a management application to discover the connectivity
units in the framework and the topology of their interconnect. That is, the goal is
to assist the management application not only to list the elements of the
framework, but to map them.
With this goal, the agent should include as much information as it possesses about
any links from its own connectivity units to others, including links among its own
units.
An agent should include partial information about links if it is not able to fully
define them. For an entry to be considered to be valid, both the X (local) and the Y
(remote) need to have one valid value.
If the agent is able to discover links which do not directly attach to members of its
agency, and its discovery algorithm gives some assurance that the links are
recently valid, it may include these links.
Link information entered by administrative action MAY be included, even if not
validated directly, if the link has at least one endpoint in this agency, but should
not be included otherwise.
A connectivity unit can fill the table in as best it can. One of the methods to fill
this in would be to use the RNID ELS (ANSI document 99-422v0). This makes it
possible to query a port for the information needed for the link table.
This table is accessed either directly, if the management software has an index
value, or via GetNexts. The values of the indexes are not required to be
contiguous. Each entry created in this table will be 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.
Note: For EOS firmware: A reset or firmware load will cause this table to be
regenerated from the persistent login database – table indices will most likely be
associated with different entries after the reset.