ZHONE-GEN-LINE-REDUNDANCY Table View

The table which contains Zhone-specific 
descriptions of each physical line. There is one
entry for each physical line in the system and
it's primary use is for a user to specify redundant
lines in the system. 
          
An entry is automatically created by the associated
driver whenever a new card is inserted in the 
system (specifically when an ifindex value is 
allocated for this port). 
          
Statistics, admin state, and operational state
can be obtained by the matching ifEntry.
          
This line is part of a redundancy group if the
lgRedundancyGroupId is non-zero. This value is a 
cross-reference to the maching line redundancy group
table and must be created by the user.
          
In order for a line/ifEntry to be admin'd active,
this line MUST be part of a line redundancy group
(even if no redundancy is being configured).

The lineGroupTable contains descriptions of the 
redundancy relationship between lines.  Each of the
two lines are given a weight between 1 and 10 which 
is used to determine their role.
          
Each line is referenced by an ID (ifIndex) used to
access the ifEntry and lineProfile tables. The use of
Primary/Secondary naming convention is arbitrary and
specifying either does not guarantee any particular 
line having additional priority. The sole 
determination of which line is active is the 
weighting level, thus where if both are equal, which 
ever line becomes active remains active until an 
error condition occurs.
          
Table entries are created only by the user when they 
add/make a line part of a redundancy group. Non-
Redundancy configurations require one of the entries
(primary or secondary) to be populated. It is 
possible to have a redundancy group entry with both 
fields not configured (0), however, the state must be
Admin down for this group. Activation requests in 
this state will cause an error return.