rfc2494.txt
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An example is given here to explain the ifIndex mapping objects in
the DS0Bundle MIB to help the implementor use the objects correctly.
Assume that a DS1 (with ifIndex 1) is channelized into DS0s. There
will be 24 DS0s in the ifTable. Assume the entries in the ifTable
for the DS0s are created in channel order and the ifIndex values are
2 through 25. Now, assume that there are two bundles on the DS1.
The first one uses channels 1 and 2. The second uses channels 3 and
4. There will be two ifTable entries for these bundles, with values
of 26 and 27 for ifIndex. There will be an entry in the
dsx0BundleTable for each bundle. The entries will be as follows:
dsx0BundleTable Entries
dsx0BundleIndex dsx0BundleIfIndex
1 26
2 27
There will be an entry in the dsx0ConfigTable for each DS0. The
entries will be as follows:
dsx0ConfigTable Entries
ifIndex dsx0Ds0ChannelNumber dsx0Ds0BundleMappedIfIndex
2 1 26
3 2 26
4 3 27
5 4 27
6 5 0
7 6 0
......
25 24 0
3. Overview of the MIB
This document contains 2 MIB modules, the DS0 MIB and the DS0Bundle
MIB.
Fowler, Ed. Standards Track [Page 7]
RFC 2494 DSO MIB / DSOBUNDLE MIB January 1999
3.1. DS0 MIB
The DS0 MIB is used to represent individual DS0s in a DS1 or E1.
Variables in this MIB would be created for each DS0 in the ifTable.
This MIB contains the following group:
The DS0 Config Group - This group contains configuration information
about a particular DS0.
3.2. DS0Bundle MIB
The DS0Bundle MIB is used to represent collections of DS0s that are
used together to carry data within a DS1/E1 at speeds greater than
that of a single DS0. DS0Bundles are created on top of DS0s and are
represented that way in the ifStackTable. This MIB contains the
following groups:
The DS0 Bundle Group - This group contains objects used for creating
new ds0Bundles. This group is mandatory.
The DS0 Bonding Group - This group contains information about bonding
for a ds0Bundle, if bonding is enabled. This group is optional.
4. Object Definitions for DS0
DS0-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE,
transmission FROM SNMPv2-SMI
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF
DisplayString, TruthValue FROM SNMPv2-TC
ifIndex, InterfaceIndex,
InterfaceIndexOrZero FROM IF-MIB;
-- This is the MIB module for the DS0 Interface objects.
ds0 MODULE-IDENTITY
LAST-UPDATED "9807161630Z"
ORGANIZATION "IETF Trunk MIB Working Group"
CONTACT-INFO
" David Fowler
Postal: Newbridge Networks Corporation
600 March Road
Kanata, Ontario, Canada K2K 2E6
Tel: +1 613 591 3600
Fowler, Ed. Standards Track [Page 8]
RFC 2494 DSO MIB / DSOBUNDLE MIB January 1999
Fax: +1 613 599 3619
E-mail: davef@newbridge.com"
DESCRIPTION
"The MIB module to describe
DS0 interfaces objects."
REVISION "9805242010Z"
DESCRIPTION
"Initial version of the DS0-MIB."
::= { transmission 81 }
-- The DS0 Config Group
-- Implementation of this group is mandatory for all
-- systems that use a DS0 Interface.
-- The DS0 Config Group consists of two tables:
-- DS0 Configuration Table
-- DS0 Channel Mapping Table
-- The DS0 Configuration Table
dsx0ConfigTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx0ConfigEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS0 Configuration table."
::= { ds0 1 }
dsx0ConfigEntry OBJECT-TYPE
SYNTAX Dsx0ConfigEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS0 Configuration table. There
is an entry in this table for each DS0 interface."
INDEX { ifIndex }
::= { dsx0ConfigTable 1 }
Dsx0ConfigEntry ::=
SEQUENCE {
dsx0Ds0ChannelNumber INTEGER,
dsx0RobbedBitSignalling TruthValue,
dsx0CircuitIdentifier DisplayString,
dsx0IdleCode INTEGER,
dsx0SeizedCode INTEGER,
Fowler, Ed. Standards Track [Page 9]
RFC 2494 DSO MIB / DSOBUNDLE MIB January 1999
dsx0ReceivedCode INTEGER,
dsx0TransmitCodesEnable TruthValue,
dsx0Ds0BundleMappedIfIndex InterfaceIndexOrZero
}
dsx0Ds0ChannelNumber OBJECT-TYPE
SYNTAX INTEGER(0..31)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates the channel number of the
ds0 on its DS1/E1."
::= { dsx0ConfigEntry 1 }
dsx0RobbedBitSignalling OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object indicates if Robbed Bit Signalling is
turned on or off for a given ds0. This only
applies to DS0s on a DS1 link. For E1 links the
value is always off (false)."
::= { dsx0ConfigEntry 2 }
dsx0CircuitIdentifier OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object contains the transmission vendor's
circuit identifier, for the purpose of
facilitating troubleshooting."
::= { dsx0ConfigEntry 3 }
dsx0IdleCode OBJECT-TYPE
SYNTAX INTEGER(0..15)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object contains the code transmitted in the
ABCD bits when the ds0 is not connected and
dsx0TransmitCodesEnable is enabled. The object is
a bitmap and the various bit positions are:
1 D bit
2 C bit
4 B bit
8 A bit"
Fowler, Ed. Standards Track [Page 10]
RFC 2494 DSO MIB / DSOBUNDLE MIB January 1999
::= { dsx0ConfigEntry 4 }
dsx0SeizedCode OBJECT-TYPE
SYNTAX INTEGER(0..15)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object contains the code transmitted in the
ABCD bits when the ds0 is connected and
dsx0TransmitCodesEnable is enabled. The object is
a bitmap and the various bit positions are:
1 D bit
2 C bit
4 B bit
8 A bit"
::= { dsx0ConfigEntry 5 }
dsx0ReceivedCode OBJECT-TYPE
SYNTAX INTEGER(0..15)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object contains the code being received in
the ABCD bits. The object is a bitmap and the
various bit positions are:
1 D bit
2 C bit
4 B bit
8 A bit"
::= { dsx0ConfigEntry 6 }
dsx0TransmitCodesEnable OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object determines if the idle and seized
codes are transmitted. If the value of this object
is true then the codes are transmitted."
::= { dsx0ConfigEntry 7 }
dsx0Ds0BundleMappedIfIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates the ifIndex value assigned
by the agent for the ds0Bundle(82) ifEntry to
Fowler, Ed. Standards Track [Page 11]
RFC 2494 DSO MIB / DSOBUNDLE MIB January 1999
which the given ds0(81) ifEntry may belong.
If the given ds0(81) ifEntry does not belong to
any ds0Bundle(82) ifEntry, then this object has a
value of zero.
While this object provides information that can
also be found in the ifStackTable, it provides
this same information with a single table lookup,
rather than by walking the ifStackTable to find
the possibly non-existent ds0Bundle(82) ifEntry
that may be stacked above the given ds0(81)
ifTable entry."
::= { dsx0ConfigEntry 8 }
-- The DS0 Channel Mapping Table
dsx0ChanMappingTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx0ChanMappingEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS0 Channel Mapping table. This table maps a
DS0 channel number on a particular DS1/E1 into an
ifIndex."
::= { ds0 3 }
dsx0ChanMappingEntry OBJECT-TYPE
SYNTAX Dsx0ChanMappingEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS0 Channel Mapping table. There
is an entry in this table corresponding to each
ds0 ifEntry within any interface that is
channelized to the individual ds0 ifEntry level.
This table is intended to facilitate mapping from
channelized interface / channel number to DS0
ifEntry. (e.g. mapping (DS1 ifIndex, DS0 Channel
Number) -> ifIndex)
While this table provides information that can
also be found in the ifStackTable and
dsx0ConfigTable, it provides this same information
with a single table lookup, rather than by walking
the ifStackTable to find the various constituent
ds0 ifTable entries, and testing various
Fowler, Ed. Standards Track [Page 12]
RFC 2494 DSO MIB / DSOBUNDLE MIB January 1999
dsx0ConfigTable entries to check for the entry
with the applicable DS0 channel number."
INDEX { ifIndex, dsx0Ds0ChannelNumber }
::= { dsx0ChanMappingTable 1 }
Dsx0ChanMappingEntry ::=
SEQUENCE {
dsx0ChanMappedIfIndex InterfaceIndex
}
dsx0ChanMappedIfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates the ifIndex value assigned
by the agent for the individual ds0 ifEntry that
corresponds to the given DS0 channel number
(specified by the INDEX element
dsx0Ds0ChannelNumber) of the given channelized
interface (specified by INDEX element ifIndex)."
::= { dsx0ChanMappingEntry 1 }
-- conformance information
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