| The physical port number to be used as the active port. The
primary port defaults as the active port if this object is not set.
Rules:
- This object can always be set when ctATMPhyRedundStatus (q.v.) is
set to disable(2).
- It cannot be set when ctATMPhyRedundStatus is set to enable(1),
ctATMPhyRedundPrimaryRevert (q.v.) is set to automatic(1), and the
primary port is deemed good (and therefore usable) by redundancy.
Under these conditions, it is meaningless to attempt to manually set
the Active Port, as Redundancy would simply reset the active port to
the primary again immediately after the set takes place.
- If the primary port has failed, or ctATMPhyRedundPrimaryRevert is
set to manual(2), then this object can be set; however, the behaviour
of redundancy as a result of the set will depend on the status of
ctATMPhyRedundActivation (q.v.) and whether or not the port being set
active is good. If RedundActivation is enabled, the set may be
countermanded immediately if at any time the port being set is found
to be bad (and therefore not usable by Redundancy) and another (good)
redundant port is available. If RedundActivation is set to manual(2),
then the set will take place, regardless of the status of the port
being set. Naturally, if the primary port is restored, the behaviour
of Redundancy will depend on whether RedundPrimaryRevert is automatic;
if it is, the active port will immediately switch over; otherwise it
will remain as-is.
There is a precisely defined relationship between
ctATMPhyRedundActivePort, ctATMPhyRedundStatus,
ctATMPhyRedundPrimaryRevert, and ctATMPhyRedundActivation. If
RedundStatus is disabled, then PrimaryRevert and RedundActivation have
no functional meaning and ActivePort becomes the only means by which
the redundant ports can be switched. Likewise, if RedundStatus is
enabled and PrimaryRevert is automatic, a set of the ActivePort has no
functional meaning for as long as the primary port is deemed usable by
redundancy. If RedundStatus is enabled but PrimaryRevert is
manual, the active port will only be changed through ActivePort or
the exercise of RedundActivation. The line of precedence, therefore,
fully depends upon the status of Redundancy; if RedundStatus is
disabled, then precedence lies with ActivePort by virtue of the fact
that there are no other competing methods to switch the active port
among the redundant ports. If RedundStatus is enabled, however,
PrimaryRevert (an active switching method) and RedundActivation (a
passive switching method) have precedence over ActivePort; if
PrimaryRevert is set to automatic, then the active port is immediately
switched to the primary as soon as it's deemed usable by Redundancy;
likewise, if RedundActivation is set to automatic, the currently
active port will be switched immediately in the event of port failure.
Clearly, then, ActivePort cannot guarantee a set for as long as any
automatic part of Redundancy is enabled.
This object is persistent. |
