Network Working Group C. Brown

Network Working Group C. Brown
Request for Comments: 2115 Cadia Networks, Inc.
Obsoletes: 1315 F. Baker
Category: Standards Track Cisco Systems
September 1997

Management Information Base for Frame Relay DTEs
Using SMIv2

1. Status of this Memo

This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.

2. Abstract

This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in TCP/IP- based internets.
In particular, it defines objects for managing Frame Relay interfaces
on DTEs.

Table of Contents

1 Status of this Memo ................................... 1
2 Abstract .............................................. 1
3 The SNMPv2 Network Management Framework ............... 2
4 Overview .............................................. 2
4.1 Frame Relay Operational Model ....................... 2
4.2 Textual Conventions ................................. 6
4.3 Structure of MIB .................................... 6
5 Changes from RFC 1315 ................................. 6
6 Definitions ........................................... 8
6.1 Data Link Connection Management Interface ........... 9
6.2 Circuit Table ....................................... 14
6.3 Error Table ......................................... 22
6.4 Trap Management ..................................... 25
7 Security Issues ....................................... 30
8 Acknowledgments ....................................... 30
9 Authors' Addresses .................................... 31
10 References ........................................... 31

Brown & Baker Standards Track [Page 1]

RFC 2115 Frame Relay DTE MIB September 1997

3. The SNMPv2 Network Management Framework

The major components of the SNMPv2 Network Management framework are
described in the documents listed below.

o RFC 1902 [1] defines the Structure of Management
Information (SMI), the mechanisms used for describing and
naming objects for the purpose of management.

o STD 17, RFC 1213 [2] defines MIB-II, the core set of
managed objects (MO) for the Internet suite of protocols.

o RFC 1905 [3] defines the protocol used for network access
to managed objects.

The framework is adaptable/extensible by defining new MIBs to suit
the requirements of specific applications/protocols/situations.

Managed objects are accessed via a virtual information store, the
MIB. Objects in the MIB are defined using the subset of Abstract
Syntax Notation One (ASN.1) defined in the SMI. In particular, each
object type is named by an OBJECT IDENTIFIER, which is an
administratively assigned name. The object type together with an
object instance serves to uniquely identify a specific instantiation
of the object. For human convenience, often a textual string, termed
the descriptor, is used to refer to the object type.

4. Overview

4.1. Frame Relay Operational Model

For the purposes of understanding this document, Frame Relay is
viewed as a multi-access media, not as a group of point- to-point
connections. This model proposes that Frame Relay is a single
interface to the network (physical connection) with many destinations
or neighbors (virtual connections). This view enables a network
manager the ability to group all virtual connections with their
corresponding physical connection thereby allowing simpler
diagnostics and trouble shooting.

With the extension of the interfaces MIB, it is possible to configure
frame relay DLCs as individual interfaces and create ifTable entries
for each. This is not recommended and is not directly supported by
this MIB. Additionally, in the presence of demand circuits creation
of individual ifEntries for each is not possible.

Brown & Baker Standards Track [Page 2]

RFC 2115 Frame Relay DTE MIB September 1997

Should the user wish to group DLCs together to associate them with a
higher layer, or to associate a DLC with an unnumbered point-to-point
service, the frame relay DTE MIB provides an entry in the
frCircuitEntry record. For example, suppose one were to configure a
company proprietary protocol to run above several of the frame relay
VCs. The basic layering would look something like the following:

IP (ipaddrEntry 1 ) IP (ipaddrEntry 2) IP (ipaddrEntry 3)
| | |
| | |
| | proprietary protocol
| | layer (ifIndex 3)
| | |
| | |
DLCI 20 DLCI 30 DLCI 40/41/42
(ifIndex 2) (ifIndex 2) (ifIndex 2,
logical ifIndex 3)
| | |
| | |
|____________________|_____________________|
|
|
FR DLMCI (ifIndex.2)
|
|
Physical Interface (ifIndex.1)

A configuration which specified that DLCI 40, 41,and 42 were associated
with a proprietary protocol layer, while DLCI 20 and 30 were to run IP
directly can now be expressed using a combination of frCircuitIfIndex
and frCircuitLogicalIfIndex. In this particular case DLCIs 40, 41 and
42 would use frCircuitIfIndex equal to the frame relay interface level
(2) while their frCircuitLogicalIfIndex would indicate the proprietary
protocol (3). DLCIs 20 and 30 would have both instances set to the frame
relay interface (2).

Object Meaning for Frame Relay Interface
______ _____________________________________

ifDescr As per DESCRIPTION in RFC 1573.
ifType The value allocated for Frame Relay
Interfaces - frameRelay (32).

ifMtu Set to maximum frame size in octets for
this frame relay interface.

Brown & Baker Standards Track [Page 3]

RFC 2115 Frame Relay DTE MIB September 1997

ifSpeed The access rate for the frame relay
interface. This could be different from
the speed of the underlying physical
interface, e.g. in a fractional T1 case
the access rate could be 384 kbits/s (the
value reported in this object) whereas the
speed of the underlying interface would be
1.544 Mbits/s (the value reported in the
instance of ifSpeed for the ifEntry with
type ds1).

ifPhysAddress The primary address for this interface
assigned by the Frame Relay interface
provider. An octet string of zero length
if no address is used for this interface.

ifAdminStatus As per DESCRIPTION in RFC 1573.

ifOperStatus As per DESCRIPTION in RFC 1573.

ifLastChange As per DESCRIPTION in RFC 1573.

ifInOctets The number of received octets. This
includes not only the information field
(user data) but also the frame relay header
and CRC.

ifInUcastPkts The number of frames received on non-
multicast DLCIs

ifInDiscards The number of frames that were successfully
received but were discarded because of
format errors or because the VC was not
known. Format errors, in this case, are
any errors which would prevent the system
from recognizing the DLCI and placing the
error in the frCircuitDiscard category.

ifInErrors The number of received frames that are
discarded, because of an error.
Possible errors can be the following: the
frame relay frames were too long or were
too short, the frames had an invalid or
unrecognized DLCI values, or incorrect
header values.

Brown & Baker Standards Track [Page 4]

RFC 2115 Frame Relay DTE MIB September 1997

ifInUnknownProtos Number of unknown or unsupported
upper layer protocol frames received
and discarded.

ifOutOctets The number of received octets. This
includes not only the information field
(user data) but also the frame relay header
and CRC.

ifOutUcastpkts The number of frames sent.

ifOutDiscards The number of frames discarded in the
transmit direction.

ifOutErrors The number of frames discarded in the
egress direction, because of errors.

ifName As per DESCRIPTION in RFC 1573.

ifInMulticastPkts The number of unerrored frames received
on a multicast DLCI.

ifInBroadcastPkts Always zero (0) as there are no broadcast
frames.

ifOutMulticastPkts The number of frames transmitted over a
multicast DLCI.

ifOutBroadcastPkts Always zero (0) as there are no broadcast
frames.

ifHCInOctets Only required when ifSpeed >= 155 Mbits/s.
See
details for ifInOctets.

ifHCOutOctets Only required when ifSpeed >= 155 Mbits/s.
See
details for ifInOctets.

ifLinkUpDownTrapEnble As per DESCRIPTION in RFC 1573.

ifHighSpeed The access rate of the frame relay interface
measured in Mbits/s. If the access rate is
less than 1 Mbits/s, this object returns 0.

ifPromiscuousMode Set to false(2).

ifConnectorPresent Set to false(2).

Brown & Baker Standards Track [Page 5]

RFC 2115 Frame Relay DTE MIB September 1997

4.2. Textual Conventions

One new data type is introduced as a textual convention in this MIB
document. This textual convention enhances the readability of the
specification and can ease comparison with other specifications if
appropriate. It should be noted that the introduction of this
textual conventions has no effect on either the syntax nor the
semantics of any managed objects. The use of this is merely an
artifact of the explanatory method used. Objects defined in terms of
one of these methods are always encoded by means of the rules that
define the primitive type. Hence, no changes to the SMI or the SNMP
are necessary to accommodate this textual conventions which is
adopted merely for the convenience of readers and writers in pursuit
of the elusive goal of clear, concise, and unambiguous MIB documents.

The new data type is DLCI. DLCI refers to the range 0..DLCINumber,
and is used to refer to the valid Data Link Connection Indices.
DLCINumber is, by definition, the largest possible DLCI value
possible under the configured Q.922 Address Format.

4.3. Structure of MIB

The MIB is composed of three groups, one defining the Data Link
Connection Management Interface (DLCMI), one describing the Circuits,
and a third describing errors.

During normal operation, Frame Relay virtual circuits will be added,
deleted and change availability. The occurrence of such changes is of
interest to the network manager and therefore, one trap is defined,
intended to be corollary to the SNMP "Link Up" and "Link Down" traps.

5. Changes from RFC 1315

Below are listed the changes from the previously published version
this document, which was RFC 1315:

o The MIB module was converted from SMIv1 to SMIv2 format.
Note: due to this, the table indices have access of
"read-only" instead of "not-accessible", which is the
typical value for index objects in SMIv2.

o The module name was changed from RFC1315-MIB to FRAME-
RELAY-DTE-MIB.

o The textual convention "Index" was dropped from the MIB
module and "InterfaceIndex" from the interfaces MIB
module, IF-MIB, was used in its place.

Brown & Baker Standards Track [Page 6]

RFC 2115 Frame Relay DTE MIB September 1997

o Objects frDlcmiStatus and frDlcmiRowStatus were added to
table frDlcmiTable.

o Added values "itut933A(5)" (from CCITT Q933 Annex A) and
"ansiT1617D1994(6)" (from ANSI T1.617a-1994 Annex D) to
the enumerations for object frDlcmiState.

o The labels for the enumerated values for object
frDlcmiAddressLen were renamed to remove their hyphens as
required by SMIv2.

o Added clarification that the "management virtual circuit"
(i.e. DLCI 0) is a member of the circuit table.

o Added the following objects to table frCircuitTable:
frCircuitMulticast, frCircuitType, frCircuitDiscards,
frCircuitReceivedDEs, frCircuitSentDEs,
frCircuitLogicalIfIndex, and frCircuitRowStatus.

o The definition of object frCircuitReceivedOctets was
clarified as to which octets were counted.

o Added the objects frErrFaults and frErrFaultTime to table
frErrTable.

o Added clarification to the values of object frErrType.

o Added size on definition of object frErrData and
clarified what data to capture.

o Changed identififier for OID value { frameDelayDTE 4 }
from frame-relay-globals to frameRelayTrapControl.

o Added object frTrapMaxRate.

o Created object groups frPortGroup, frCircuitGroup,
frTrapGroup, frErrGroup, frPortGroup0, frCircuitGroup0,
frTrapGroup0, and frErrGroup0.

o Created notification group frNotificationGroup.

o Created module compliances frCompliance and
frCompliance0.

o Added ranges to objects frCircuitCommittedBurst,
frCircuitExcessBurst, and frCircuitThroughput.

Brown & Baker Standards Track [Page 7]

RFC 2115 Frame Relay DTE MIB September 1997

6. Definitions

FRAME-RELAY-DTE-MIB DEFINITIONS ::= BEGIN

IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Counter32,
Integer32, NOTIFICATION-TYPE FROM SNMPv2-SMI
TEXTUAL-CONVENTION, RowStatus, TimeStamp FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP,
NOTIFICATION-GROUP FROM SNMPv2-CONF
transmission FROM RFC1213-MIB
InterfaceIndex FROM IF-MIB;

-- Frame Relay DTE MIB

frameRelayDTE MODULE-IDENTITY
LAST-UPDATED "9705010229Z" -- Thu May 1 02:29:46 PDT 1997
ORGANIZATION "IETF IPLPDN Working Group"
CONTACT-INFO
" Caralyn Brown
Postal: Cadia Networks, Inc.
1 Corporate Drive
Andover, Massachusetts 01810
Tel: +1 508 689 2400 x133
E-Mail: [email protected]

Fred Baker
Postal: Cisco Systems
519 Lado Drive
Santa Barbara, California 93111
Tel: +1 408 526 425
E-Mail: [email protected]"
DESCRIPTION
"The MIB module to describe the use of a Frame Relay
interface by a DTE."
REVISION "9705010229Z" -- Thu May 1 02:29:46 PDT 1997
DESCRIPTION
"Converted from SMIv1 to SMIv2. (Thus, indices are
read-only rather than being not-accessible.) Added
objects and made clarifications based on implementation
experience."

REVISION "9204010000Z"
DESCRIPTION
"Published as RFC 1315, the initial version of this MIB
module."
::= { transmission 32 }

Brown & Baker Standards Track [Page 8]

RFC 2115 Frame Relay DTE MIB September 1997

--
-- the range of a Data Link Connection Identifier
--
DLCI ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"The range of DLCI values. Note that this varies by
interface configuration; normally, interfaces may use
0..1023, but may be configured to use ranges as large
as 0..2^23."
SYNTAX Integer32(0..8388607)

--

-- Data Link Connection Management Interface

-- The variables that configure the DLC Management Interface.

frDlcmiTable OBJECT-TYPE
SYNTAX SEQUENCE OF FrDlcmiEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The Parameters for the Data Link Connection Management
Interface for the frame relay service on this
interface."
REFERENCE
"American National Standard T1.617-1991, Annex D"
::= { frameRelayDTE 1 }

frDlcmiEntry OBJECT-TYPE
SYNTAX FrDlcmiEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The Parameters for a particular Data Link Connection
Management Interface."
INDEX { frDlcmiIfIndex }
::= { frDlcmiTable 1 }

Brown & Baker Standards Track [Page 9]

RFC 2115 Frame Relay DTE MIB September 1997

FrDlcmiEntry ::=
SEQUENCE {
frDlcmiIfIndex InterfaceIndex,
frDlcmiState INTEGER,
frDlcmiAddress INTEGER,
frDlcmiAddressLen INTEGER,
frDlcmiPollingInterval Integer32,
frDlcmiFullEnquiryInterval Integer32,
frDlcmiErrorThreshold Integer32,
frDlcmiMonitoredEvents Integer32,
frDlcmiMaxSupportedVCs DLCI,
frDlcmiMulticast INTEGER,
frDlcmiStatus INTEGER,
frDlcmiRowStatus RowStatus
}

frDlcmiIfIndex OBJECT-TYPE

SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The ifIndex value of the corresponding ifEntry."
::= { frDlcmiEntry 1 }

frDlcmiState OBJECT-TYPE
SYNTAX INTEGER {
noLmiConfigured (1),
lmiRev1 (2),
ansiT1617D (3), -- ANSI T1.617 Annex D
ansiT1617B (4), -- ANSI T1.617 Annex B
itut933A (5), -- CCITT Q933 Annex A
ansiT1617D1994 (6) -- ANSI T1.617a-1994 Annex D
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This variable states which Data Link Connection
Management scheme is active (and by implication, what
DLCI it uses) on the Frame Relay interface."
REFERENCE
"American National Standard T1.617-1991, American
National Standard T1.617a-1994, ITU-T Recommendation
Q.933 (03/93)."

::= { frDlcmiEntry 2 }

Brown & Baker Standards Track [Page 10]

RFC 2115 Frame Relay DTE MIB September 1997

frDlcmiAddress OBJECT-TYPE
SYNTAX INTEGER {
q921 (1), -- 13 bit DLCI
q922March90 (2), -- 11 bit DLCI
q922November90 (3), -- 10 bit DLCI
q922 (4) -- Final Standard
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This variable states which address format is in use on
the Frame Relay interface."
::= { frDlcmiEntry 3 }

frDlcmiAddressLen OBJECT-TYPE
SYNTAX INTEGER {
twoOctets (2),
threeOctets (3),
fourOctets (4)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This variable states the address length in octets. In
the case of Q922 format, the length indicates the
entire length of the address including the control
portion."
::= { frDlcmiEntry 4 }

frDlcmiPollingInterval OBJECT-TYPE
SYNTAX Integer32 (5..30)
UNITS "seconds"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the number of seconds between successive
status enquiry messages."
REFERENCE
"American National Standard T1.617-1991, Section D.7
Timer T391."
DEFVAL { 10 }
::= { frDlcmiEntry 5 }

Brown & Baker Standards Track [Page 11]

RFC 2115 Frame Relay DTE MIB September 1997

frDlcmiFullEnquiryInterval OBJECT-TYPE
SYNTAX Integer32 (1..255)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Number of status enquiry intervals that pass before
issuance of a full status enquiry message."
REFERENCE
"American National Standard T1.617-1991, Section D.7
Counter N391."
DEFVAL { 6 }
::= { frDlcmiEntry 6 }

frDlcmiErrorThreshold OBJECT-TYPE
SYNTAX Integer32 (1..10)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the maximum number of unanswered Status
Enquiries the equipment shall accept before declaring
the interface down."
REFERENCE
"American National Standard T1.617-1991, Section D.5.1
Counter N392."
DEFVAL { 3 }
::= { frDlcmiEntry 7 }

frDlcmiMonitoredEvents OBJECT-TYPE
SYNTAX Integer32 (1..10)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This is the number of status polling intervals over
which the error threshold is counted. For example, if
within 'MonitoredEvents' number of events the station
receives 'ErrorThreshold' number of errors, the
interface is marked as down."
REFERENCE
"American National Standard T1.617-1991, Section D.5.2
Counter N393."
DEFVAL { 4 }
::= { frDlcmiEntry 8 }

Brown & Baker Standards Track [Page 12]

RFC 2115 Frame Relay DTE MIB September 1997

frDlcmiMaxSupportedVCs OBJECT-TYPE
SYNTAX DLCI
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The maximum number of Virtual Circuits allowed for
this interface. Usually dictated by the Frame Relay
network.

In response to a SET, if a value less than zero or
higher than the agent's maximal capability is
configured, the agent should respond badValue"
::= { frDlcmiEntry 9 }

frDlcmiMulticast OBJECT-TYPE
SYNTAX INTEGER {
nonBroadcast (1),
broadcast (2)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This indicates whether the Frame Relay interface is
using a multicast service."
::= { frDlcmiEntry 10 }

frDlcmiStatus OBJECT-TYPE
SYNTAX INTEGER {
running (1), -- init complete, system running
fault (2), -- error threshold exceeded
initializing (3) -- system start up
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This indicates the status of the Frame Relay interface
as determined by the performance of the dlcmi. If no
dlcmi is running, the Frame Relay interface will stay
in the running state indefinitely."
::= { frDlcmiEntry 11 }

Brown & Baker Standards Track [Page 13]

RFC 2115 Frame Relay DTE MIB September 1997

frDlcmiRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"SNMP Version 2 Row Status Variable. Writable objects
in the table may be written in any RowStatus state."
::= { frDlcmiEntry 12 }

--
-- A Frame Relay service is a multiplexing service. Data
-- Link Connection Identifiers enumerate virtual circuits
-- (permanent or dynamic) which are layered onto the underlying
-- circuit, represented by ifEntry. Therefore, each of the entries
-- in the Standard MIB's Interface Table with an IfType of
-- Frame Relay represents a Q.922 interface. Zero or more
-- virtual circuits are layered onto this interface and provide
-- interconnection with various remote destinations.
-- Each such virtual circuit is represented by an entry in the
-- circuit table. The management virtual circuit (i.e. DLCI 0)
-- is a virtual circuit by this definition and will be represented
-- with an entry in the circuit table.

-- Circuit Table

-- The table describing the use of the DLCIs attached to
-- each Frame Relay Interface.

frCircuitTable OBJECT-TYPE
SYNTAX SEQUENCE OF FrCircuitEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table containing information about specific Data
Link Connections (DLC) or virtual circuits."
::= { frameRelayDTE 2 }

Brown & Baker Standards Track [Page 14]

RFC 2115 Frame Relay DTE MIB September 1997

frCircuitEntry OBJECT-TYPE
SYNTAX FrCircuitEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The information regarding a single Data Link
Connection. Discontinuities in the counters contained
in this table are indicated by the value in
frCircuitCreationTime."
INDEX { frCircuitIfIndex, frCircuitDlci }
::= { frCircuitTable 1 }

FrCircuitEntry ::=
SEQUENCE {
frCircuitIfIndex InterfaceIndex,
frCircuitDlci DLCI,
frCircuitState INTEGER,
frCircuitReceivedFECNs Counter32,
frCircuitReceivedBECNs Counter32,
frCircuitSentFrames Counter32,
frCircuitSentOctets Counter32,
frCircuitReceivedFrames Counter32,
frCircuitReceivedOctets Counter32,
frCircuitCreationTime TimeStamp,
frCircuitLastTimeChange TimeStamp,
frCircuitCommittedBurst Integer32,
frCircuitExcessBurst Integer32,
frCircuitThroughput Integer32,
frCircuitMulticast INTEGER,
frCircuitType INTEGER,
frCircuitDiscards Counter32,
frCircuitReceivedDEs Counter32,
frCircuitSentDEs Counter32,
frCircuitLogicalIfIndex InterfaceIndex,
frCircuitRowStatus RowStatus
}

frCircuitIfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The ifIndex Value of the ifEntry this virtual circuit
is layered onto."
::= { frCircuitEntry 1 }

Brown & Baker Standards Track [Page 15]

RFC 2115 Frame Relay DTE MIB September 1997

frCircuitDlci OBJECT-TYPE
SYNTAX DLCI
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The Data Link Connection Identifier for this virtual
circuit."
REFERENCE
"American National Standard T1.618-1991, Section 3.3.6"
::= { frCircuitEntry 2 }

frCircuitState OBJECT-TYPE
SYNTAX INTEGER {

invalid (1),
active (2),
inactive (3)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Indicates whether the particular virtual circuit is
operational. In the absence of a Data Link Connection
Management Interface, virtual circuit entries (rows)
may be created by setting virtual circuit state to
'active', or deleted by changing Circuit state to
'invalid'.

Whether or not the row actually disappears is left to
the implementation, so this object may actually read as
'invalid' for some arbitrary length of time. It is
also legal to set the state of a virtual circuit to
'inactive' to temporarily disable a given circuit.

The use of 'invalid' is deprecated in this SNMP Version
2 MIB, in favor of frCircuitRowStatus."
DEFVAL { active }
::= { frCircuitEntry 3 }

Brown & Baker Standards Track [Page 16]

RFC 2115 Frame Relay DTE MIB September 1997

frCircuitReceivedFECNs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of frames received from the network indicating
forward congestion since the virtual circuit was
created. This occurs when the remote DTE sets the FECN
flag, or when a switch in the network enqueues the
frame to a trunk whose transmission queue is
congested."
REFERENCE
"American National Standard T1.618-1991, Section 3.3.3"
::= { frCircuitEntry 4 }

frCircuitReceivedBECNs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only

STATUS current
DESCRIPTION
"Number of frames received from the network indicating
backward congestion since the virtual circuit was
created. This occurs when the remote DTE sets the BECN
flag, or when a switch in the network receives the
frame from a trunk whose transmission queue is
congested."
REFERENCE
"American National Standard T1.618-1991, Section 3.3.4"
::= { frCircuitEntry 5 }

frCircuitSentFrames OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of frames sent from this virtual circuit
since it was created."
::= { frCircuitEntry 6 }

frCircuitSentOctets OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current

Brown & Baker Standards Track [Page 17]

RFC 2115 Frame Relay DTE MIB September 1997

DESCRIPTION
"The number of octets sent from this virtual circuit
since it was created. Octets counted are the full
frame relay header and the payload, but do not include
the flag characters or CRC."
::= { frCircuitEntry 7 }

frCircuitReceivedFrames OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of frames received over this virtual circuit
since it was created."
::= { frCircuitEntry 8 }

frCircuitReceivedOctets OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of octets received over this virtual circuit
since it was created. Octets counted include the full
frame relay header, but do not include the flag
characters or the CRC."
::= { frCircuitEntry 9 }

frCircuitCreationTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime when the virtual circuit was
created, whether by the Data Link Connection Management
Interface or by a SetRequest."
::= { frCircuitEntry 10 }

Brown & Baker Standards Track [Page 18]

RFC 2115 Frame Relay DTE MIB September 1997

frCircuitLastTimeChange OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime when last there was a change in
the virtual circuit state"
::= { frCircuitEntry 11 }

frCircuitCommittedBurst OBJECT-TYPE
SYNTAX Integer32(0..2147483647)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This variable indicates the maximum amount of data, in
bits, that the network agrees to transfer under normal
conditions, during the measurement interval."
REFERENCE
"American National Standard T1.617-1991, Section
6.5.19"
DEFVAL { 0 } -- the default indicates no commitment
::= { frCircuitEntry 12 }

frCircuitExcessBurst OBJECT-TYPE
SYNTAX Integer32(0..2147483647)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This variable indicates the maximum amount of
uncommitted data bits that the network will attempt to
deliver over the measurement interval.

By default, if not configured when creating the entry,
the Excess Information Burst Size is set to the value
of ifSpeed."
REFERENCE
"American National Standard T1.617-1991, Section
6.5.19"
::= { frCircuitEntry 13 }

frCircuitThroughput OBJECT-TYPE
SYNTAX Integer32(0..2147483647)
MAX-ACCESS read-create
STATUS current
DESCRIPTION

Brown & Baker Standards Track [Page 19]

RFC 2115 Frame Relay DTE MIB September 1997

"Throughput is the average number of 'Frame Relay
Information Field' bits transferred per second across a
user network interface in one direction, measured over
the measurement interval.

If the configured committed burst rate and throughput
are both non-zero, the measurement interval, T, is
T=frCircuitCommittedBurst/frCircuitThroughput.

If the configured committed burst rate and throughput
are both zero, the measurement interval, T, is
T=frCircuitExcessBurst/ifSpeed."
REFERENCE
"American National Standard T1.617-1991, Section
6.5.19"
DEFVAL {0} -- the default value of Throughput is
-- "no commitment".
::= { frCircuitEntry 14 }

frCircuitMulticast OBJECT-TYPE
SYNTAX INTEGER {
unicast (1),
oneWay (2),
twoWay (3),
nWay (4)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This indicates whether this VC is used as a unicast VC
(i.e. not multicast) or the type of multicast service
subscribed to"
REFERENCE
"Frame Relay PVC Multicast Service and Protocol
Description Implementation: FRF.7 Frame Relay Forum
Technical Committe October 21, 1994"
DEFVAL {unicast}
-- the default value of frCircuitMulticast is
-- "unicast" (not a multicast VC).
::= { frCircuitEntry 15 }

frCircuitType OBJECT-TYPE
SYNTAX INTEGER {
static (1),
dynamic (2)
}

Brown & Baker Standards Track [Page 20]

RFC 2115 Frame Relay DTE MIB September 1997

MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Indication of whether the VC was manually created
(static), or dynamically created (dynamic) via the data
link control management interface."
::= { frCircuitEntry 16 }

frCircuitDiscards OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of inbound frames dropped because of format
errors, or because the VC is inactive."
::= { frCircuitEntry 17 }

frCircuitReceivedDEs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of frames received from the network indicating
that they were eligible for discard since the virtual
circuit was created. This occurs when the remote DTE
sets the DE flag, or when in remote DTE's switch
detects that the frame was received as Excess Burst
data."
REFERENCE
"American National Standard T1.618-1991, Section 3.3.4"
::= { frCircuitEntry 18 }

frCircuitSentDEs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of frames sent to the network indicating that
they were eligible for discard since the virtual
circuit was created. This occurs when the local DTE
sets the DE flag, indicating that during Network
congestion situations those frames should be discarded
in preference of other frames sent without the DE bit
set."
REFERENCE

Brown & Baker Standards Track [Page 21]

RFC 2115 Frame Relay DTE MIB September 1997

"American National Standard T1.618-1991, Section
3.3.4"
::= { frCircuitEntry 19 }

frCircuitLogicalIfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Normally the same value as frDlcmiIfIndex, but
different when an implementation associates a virtual
ifEntry with a DLC or set of DLCs in order to associate
higher layer objects such as the ipAddrEntry with a
subset of the virtual circuits on a Frame Relay
interface. The type of such ifEntries is defined by the
higher layer object; for example, if PPP/Frame Relay is
implemented, the ifType of this ifEntry would be PPP.
If it is not so defined, as would be the case with an
ipAddrEntry, it should be of type Other."
::= { frCircuitEntry 20 }

frCircuitRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object is used to create a new row or modify or
destroy an existing row in the manner described in the
definition of the RowStatus textual convention.
Writable objects in the table may be written in any
RowStatus state."
::= { frCircuitEntry 21 }

--
-- Error Table

-- The table describing errors encountered on each Frame
-- Relay Interface.

frErrTable OBJECT-TYPE
SYNTAX SEQUENCE OF FrErrEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table containing information about Errors on the
Frame Relay interface. Discontinuities in the counters
contained in this table are the same as apply to the

Brown & Baker Standards Track [Page 22]

RFC 2115 Frame Relay DTE MIB September 1997

ifEntry associated with the Interface."
::= { frameRelayDTE 3 }

frErrEntry OBJECT-TYPE
SYNTAX FrErrEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The error information for a single frame relay
interface."
INDEX { frErrIfIndex }
::= { frErrTable 1 }

FrErrEntry ::=
SEQUENCE {
frErrIfIndex InterfaceIndex,
frErrType INTEGER,
frErrData OCTET STRING,
frErrTime TimeStamp,
frErrFaults Counter32,
frErrFaultTime TimeStamp
}

frErrIfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The ifIndex Value of the corresponding ifEntry."
::= { frErrEntry 1 }

frErrType OBJECT-TYPE
SYNTAX INTEGER {
unknownError(1),
receiveShort(2),
receiveLong(3),
illegalAddress(4),
unknownAddress(5),
dlcmiProtoErr(6),
dlcmiUnknownIE(7),
dlcmiSequenceErr(8),
dlcmiUnknownRpt(9),
noErrorSinceReset(10)
}

Brown & Baker Standards Track [Page 23]

RFC 2115 Frame Relay DTE MIB September 1997

MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The type of error that was last seen on this interface:

receiveShort: frame was not long enough to allow
demultiplexing - the address field was incomplete,
or for virtual circuits using Multiprotocol over
Frame Relay, the protocol identifier was missing
or incomplete.

receiveLong: frame exceeded maximum length configured for this
interface.

illegalAddress: address field did not match configured format.

unknownAddress: frame received on a virtual circuit which was not
active or administratively disabled.

dlcmiProtoErr: unspecified error occurred when attempting to
interpret link maintenance frame.

dlcmiUnknownIE: link maintenance frame contained an Information
Element type which is not valid for the
configured link maintenance protocol.

dlcmiSequenceErr: link maintenance frame contained a sequence
number other than the expected value.

dlcmiUnknownRpt: link maintenance frame contained a Report Type
Information Element whose value was not valid
for the configured link maintenance protocol.

noErrorSinceReset: no errors have been detected since the last
cold start or warm start."
::= { frErrEntry 2 }

frErrData OBJECT-TYPE
SYNTAX OCTET STRING (SIZE(1..1600))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"An octet string containing as much of the error packet
as possible. As a minimum, it must contain the Q.922
Address or as much as was delivered. It is desirable
to include all header and demultiplexing information."
::= { frErrEntry 3 }

Brown & Baker Standards Track [Page 24]

RFC 2115 Frame Relay DTE MIB September 1997

frErrTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime at which the error was
detected."
::= { frErrEntry 4 }

frErrFaults OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of times the interface has gone down since
it was initialized."
::= { frErrEntry 5 }

frErrFaultTime OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime at the time when the interface
was taken down due to excessive errors. Excessive
errors is defined as the time when a DLCMI exceeds the
frDlcmiErrorThreshold number of errors within
frDlcmiMonitoredEvents. See FrDlcmiEntry for further
details."
::= { frErrEntry 6 }

--

-- Frame Relay Trap Control

frameRelayTrapControl OBJECT IDENTIFIER ::= { frameRelayDTE 4 }

-- the following highly unusual OID is as it is for compatibility
-- with RFC 1315, the SNMP V1 predecessor of this document.
frameRelayTraps OBJECT IDENTIFIER ::= { frameRelayDTE 0 }

Brown & Baker Standards Track [Page 25]

RFC 2115 Frame Relay DTE MIB September 1997

frTrapState OBJECT-TYPE
SYNTAX INTEGER { enabled(1), disabled(2) }
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable indicates whether the system produces
the frDLCIStatusChange trap."
DEFVAL { disabled }
::= { frameRelayTrapControl 1 }

frTrapMaxRate OBJECT-TYPE
SYNTAX Integer32 (0..3600000)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable indicates the number of milliseconds
that must elapse between trap emissions. If events
occur more rapidly, the impementation may simply fail
to trap, or may queue traps until an appropriate time."
DEFVAL { 0 } -- no minimum elapsed period is specified
::= { frameRelayTrapControl 2 }

-- Data Link Connection Management Interface Related Traps

frDLCIStatusChange NOTIFICATION-TYPE
OBJECTS { frCircuitState }
STATUS current

DESCRIPTION
"This trap indicates that the indicated Virtual Circuit
has changed state. It has either been created or
invalidated, or has toggled between the active and
inactive states. If, however, the reason for the state
change is due to the DLCMI going down, per-DLCI traps
should not be generated."
::= { frameRelayTraps 1 }
-- conformance information

frConformance OBJECT IDENTIFIER ::= { frameRelayDTE 6 }

frGroups OBJECT IDENTIFIER ::= { frConformance 1 }
frCompliances OBJECT IDENTIFIER ::= { frConformance 2 }

-- compliance statements

Brown & Baker Standards Track [Page 26]

RFC 2115 Frame Relay DTE MIB September 1997

frCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement "
MODULE -- this module
MANDATORY-GROUPS { frPortGroup, frCircuitGroup }

GROUP frErrGroup
DESCRIPTION
"This optional group is used for debugging Frame Relay
Systems."

GROUP frTrapGroup
DESCRIPTION
"This optional group is used for the management of
asynchronous notifications by Frame Relay Systems."

GROUP frNotificationGroup
DESCRIPTION
"This optional group defines the asynchronous
notifications generated by Frame Relay Systems."

OBJECT frDlcmiRowStatus
MIN-ACCESS read-only
DESCRIPTION
"Row creation is not required for the frDlcmiTable."

OBJECT frCircuitRowStatus

MIN-ACCESS read-only
DESCRIPTION
"Row creation is not required for the frCircuitTable."

::= { frCompliances 1 }

frCompliance0 MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for objects and the trap
defined in RFC 1315."
MODULE -- this module
MANDATORY-GROUPS { frPortGroup0, frCircuitGroup0 }

GROUP frErrGroup0
DESCRIPTION
"This optional group is used for debugging Frame Relay
Systems."

Brown & Baker Standards Track [Page 27]

RFC 2115 Frame Relay DTE MIB September 1997

GROUP frTrapGroup0
DESCRIPTION
"This optional group is used for the management of
asynchronous notifications by Frame Relay Systems."

GROUP frNotificationGroup
DESCRIPTION
"This optional group defines the asynchronous
notifications generated by Frame Relay Systems."

::= { frCompliances 2 }

-- units of conformance

frPortGroup OBJECT-GROUP
OBJECTS {
frDlcmiIfIndex, frDlcmiState, frDlcmiAddress,
frDlcmiAddressLen, frDlcmiPollingInterval,
frDlcmiFullEnquiryInterval, frDlcmiErrorThreshold,
frDlcmiMonitoredEvents, frDlcmiMaxSupportedVCs,
frDlcmiMulticast, frDlcmiStatus, frDlcmiRowStatus
}
STATUS current
DESCRIPTION
"The objects necessary to control the Link Management
Interface for a Frame Relay Interface as well as
maintain the error statistics on this interface."
::= { frGroups 1 }

frCircuitGroup OBJECT-GROUP
OBJECTS {
frCircuitIfIndex, frCircuitDlci, frCircuitState,
frCircuitReceivedFECNs, frCircuitReceivedBECNs,
frCircuitSentFrames, frCircuitSentOctets,
frCircuitReceivedFrames, frCircuitReceivedOctets,
frCircuitCreationTime, frCircuitLastTimeChange,
frCircuitCommittedBurst, frCircuitExcessBurst,
frCircuitThroughput, frCircuitMulticast,
frCircuitType, frCircuitDiscards,
frCircuitReceivedDEs, frCircuitSentDEs,
frCircuitLogicalIfIndex, frCircuitRowStatus
}
STATUS current
DESCRIPTION
"The objects necessary to control the Virtual Circuits
layered onto a Frame Relay Interface."
::= { frGroups 2 }

Brown & Baker Standards Track [Page 28]

RFC 2115 Frame Relay DTE MIB September 1997

frTrapGroup OBJECT-GROUP
OBJECTS { frTrapState, frTrapMaxRate }
STATUS current
DESCRIPTION
"The objects necessary to control a Frame Relay
Interface's notification messages."
::= { frGroups 3 }

frErrGroup OBJECT-GROUP
OBJECTS {
frErrIfIndex, frErrType, frErrData, frErrTime,
frErrFaults, frErrFaultTime
}
STATUS current
DESCRIPTION
"Objects designed to assist in debugging Frame Relay
Interfaces."
::= { frGroups 4 }

frNotificationGroup NOTIFICATION-GROUP
NOTIFICATIONS { frDLCIStatusChange }
STATUS current
DESCRIPTION
"Traps which may be used to enhance event driven
management of the interface."
::= { frGroups 5 }

frPortGroup0 OBJECT-GROUP
OBJECTS {
frDlcmiIfIndex, frDlcmiState, frDlcmiAddress,
frDlcmiAddressLen, frDlcmiPollingInterval,
frDlcmiFullEnquiryInterval, frDlcmiErrorThreshold,
frDlcmiMonitoredEvents, frDlcmiMaxSupportedVCs,
frDlcmiMulticast
}
STATUS current
DESCRIPTION
"The objects necessary to control the Link Management
Interface for a Frame Relay Interface as well as
maintain the error statistics on this interface from
RFC 1315."
::= { frGroups 6 }

frCircuitGroup0 OBJECT-GROUP
OBJECTS {
frCircuitIfIndex, frCircuitDlci, frCircuitState,
frCircuitReceivedFECNs, frCircuitReceivedBECNs,
frCircuitSentFrames, frCircuitSentOctets,

Brown & Baker Standards Track [Page 29]

RFC 2115 Frame Relay DTE MIB September 1997

frCircuitReceivedFrames, frCircuitReceivedOctets,
frCircuitCreationTime, frCircuitLastTimeChange,
frCircuitCommittedBurst, frCircuitExcessBurst,
frCircuitThroughput
}
STATUS current
DESCRIPTION
"The objects necessary to control the Virtual Circuits
layered onto a Frame Relay Interface from RFC 1315."
::= { frGroups 7 }

frErrGroup0 OBJECT-GROUP
OBJECTS {
frErrIfIndex, frErrType, frErrData, frErrTime
}
STATUS current
DESCRIPTION
"Objects designed to assist in debugging Frame Relay
Interfaces from RFC 1315."
::= { frGroups 8 }

frTrapGroup0 OBJECT-GROUP
OBJECTS { frTrapState }
STATUS current
DESCRIPTION
"The objects necessary to control a Frame Relay
Interface's notification messages from RFC 1315."
::= { frGroups 9 }

END

7. Security Issues

Security issues for this MIB are entirely covered by the SNMP
Security Architecture, and have not been expanded within the contents
of this MIB.

8. Acknowledgments

This document was originally produced by the IP Over Large Public
Data Networks (IPLPDN) Working Group, and has since been carried on
in the PPP Working Group, sort of. Currently, the Ion Working Group
is its host.

Special thanks to James Watt of Newbridge Networks for his fine
suggestions and pastable text.

Brown & Baker Standards Track [Page 30]

RFC 2115 Frame Relay DTE MIB September 1997

9. Authors' Addresses

Caralyn Brown
Cadia Networks, Inc.
1 Corporate Dirve
Andover, Massachusetts 01810
Telephone: +1 508 689 2400 x133
E-Mail: [email protected]

Fred Baker
Cisco Systems
519 Lado Drive
Santa Barbara, California 93111
Telephone +1 408 526 4257
E-Mail: [email protected]

10. References

[1] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
and S. Waldbusser, "Structure of Management Information
for Version 2 of the Simple Network Management Protocol
(SNMPv2)", RFC 1902, January 1996.

[2] McCloghrie, K., and M. Rose, Editors, "Management
Information Base for Network Management of TCP/IP-based
internets: MIB-II", STD 17, RFC 1213, Hughes LAN Systems,
Performance Systems International, March 1991.

[3] Case, J., Fedor, M., Schoffstall, M., and J. Davin. " A
Simple Network Management Protocol (SNMP)", STD 15, RFC
1157, SNMP Research, Performance Systems International,
MIT Lab for Computer Science, May 1990.

[4] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.,
and S. Waldbusser, "Protocol Operations for Version 2 of
the Simple Network Management Protocol (SNMPv2)", RFC
1905, January 1996.

[5] McCloghrie, K. and F. Kastenholz, "Evolution of the
Interfaces Group of MIB-II", RFC 1573, Hughes LAN
Systems, FTP Software, January 1994.

[6] T. Bradley, C. Brown, A. Malis, "Multiprotocol
Interconnect over Frame Relay", RFC 1490, 07/26/1993.

[7] International Telegraph and Telephone Consultative
Committee, "ISDN Data Link Layer Specification for Frame
Mode Bearer Services", CCITT Recommendation Q.922, 19

Brown & Baker Standards Track [Page 31]

RFC 2115 Frame Relay DTE MIB September 1997

April 1991.

[8] American National Standard For Telecommunications -
Integrated Services Digital Network - Frame Relay Bearer
Service - Architectural Framework and Service
Description, ANSI T1.606-1991, 18 June 1991.

[9] American National Standard For Telecommunications -
Integrated Services Digital Network - Digital Subscriber
Signalling System No. 1 - Signaling Specification for
Frame Relay Bearer Service, ANSI T1.617-1991, 18 June
1991.

[10] American National Standard For Telecommunications -
Integrated Services Digital Network - Core Aspects of
Frame Protocol for Use with Frame Relay Bearer Service,
ANSI T1.618-1991, 18 June 1991.

Brown & Baker Standards Track [Page 32]