Technical data

Using Technician Interface Software
A-8
303561-A Rev 00
Also, the latest editions of the following textbooks provide information about
these standards:
• Comer, Douglas E. Internetworking with TCP/IP, Vol. 1. Englewood Cliffs,
New Jersey: Prentice-Hall.
• Rose, Marshall T. The Simple Book. Englewood Cliffs, New Jersey: Prentice-
Hall.
• Stevens, Richard W. TCP/IP Illustrated, Vol. 1. Reading, Massachusetts:
Addison-Wesley.
Implementation Notes
The following notes list the assumptions made about MIB-II object definitions,
supported traps, unsupported objects, and unsupported operations.
MIB-II Object Definitions
The assumptions about MIB-II object definitions are as follows:
ifNumber
Represents the total number of rows in the interface table.
ifIndex
Represents a unique integer corresponding to a data-link layer
entity.
ifIndex
values are derived from Bay Networks circuit
numbers. A single interface or a group of interfaces (multiline)
can be a member of a single circuit. With a single interface, a
single
ifIndex
value matching the circuit number is allocated
and the
ifTable
statistics correspond to the single interface. With
a group of interfaces, a single
ifIndex
value is still allocated;
however the
ifTable
statistics are aggregated for all interfaces in
the circuit group.
Four statistics require special consideration when using
multiline:
ifAdminStatus
,
ifOperStatus
,
ifMTU
, and
ifPhysAddress
.
ifAdminStatus
and
ifOperStatus
return UP if at
least one interface is up. All interfaces must be down before
DOWN is returned. The
ifMTU
value returned is the minimum
MTU for the circuit group and the
ifPhysAddress
is the physical
address of the first interface in the circuit to initialize.