[Isis-wg] an ISIS MIB question

[He, James]

I have the following MIB questions:

  In isisISAdjTable, isisISAdjNeighborSysType
can have the values: 3(intermediate system), 4(L1 system), 
5(L2 system). Why do you need the value of 3 when there 
are already enumerations used for L1 and L2 systems?

  Also, isisISAdjNeighSysID has a length of 12 octets.
a SystemID has up to 8 octets. Why does this ID
need some extra octets?

  I noticed that isisISAdjIPAddrTable does not have
as much information as isisISAdjTable. Information
such as the type of neighboring systems and 
the type of the adjacencies are not in the IP table.
Is there any way to bridge these two tables?
I am wondering if there is an efficient way of obtaining
all neighbor system information given an IP of the
local system. 

  Which table contains the area address(es) of the local
system, isisISAdjAreaAddrTable or isisManAreaAddrTable?
The isisISAdjAreaAddrTable is indexed on 
isisISAdjAreaAddrSysInstance, isisISAdjAreaAddrCircIndex,
and isisISAdjAreaAddrAdjIndex. What if there are more
than one area addresses for a neighbor? These indices
cannot differentiate multiple addresses from the same
neighbor sent on the same circuit.




Thanks.

James