CLAB-TOPO-MIB

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Organization: Cable Television Laboratories, Inc.

Last Updated: 2017-06-15

Category: DOCSIS and Cable

Description: Provides topology discovery and node relationship information for CableLabs DOCSIS access networks.

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What Is CLAB-TOPO-MIB?

CLAB-TOPO-MIB is a CableLabs standard MIB that describes the physical topology of a DOCSIS hybrid fiber-coax (HFC) access network, specifically mapping RF channels to the fiber nodes that serve them. It exposes configuration and identification data - named fiber nodes with descriptions, and per-channel associations to those fiber nodes via interface index - rather than raw traffic counters or hardware sensors. While not a hardware-fault MIB itself, this topology information is essential to fault monitoring and correlation: when a service outage is reported, an operator uses these mappings to identify which physical fiber node and which downstream/upstream channels are affected. It is part of the broader CableLabs DOCSIS MIB suite and is designed to be used alongside other DOCSIS-specific modules like DOCS-IF-MIB that report actual channel-level status and performance. It is deployed on cable modem termination systems (CMTS) or converged cable access platforms across cable operator HFC networks, and a CLAB-TOPO-MIB reference alongside the DOCS-IF-MIB documentation helps operators map these fiber-node and channel-association objects to the live channel status data reported elsewhere.

IPNetwork Monitor allows you to monitor SNMP objects defined in CLAB-TOPO-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

vendor-neutral, standards-based MIB (CableLabs DOCSIS specification)
cable modem termination systems (CMTS)/CCAP platforms

Monitoring Examples

The clabTopoFiberNodeCfgTable defines named fiber nodes (clabTopoFiberNodeCfgNodeName and clabTopoFiberNodeCfgNodeDescr) representing physical segments of the HFC plant, each with a row-status flag. The clabTopoChFnCfgTable then associates a given channel's ifIndex (clabTopoChFnCfgChIfIndex) with one of those fiber nodes. When subscribers in a particular neighborhood report an outage, an operator cross-references these tables to determine which fiber node and channels serve that area and narrows the fault to that segment of plant.

What Can Be Monitored

fiber node name and description
channel-to-fiber-node association
fiber node configuration row status
topology table entries

Imported Objects

From CLAB-DEF-MIB

clabCommonMibs

OBJECT-IDENTITY

From IF-MIB

InterfaceIndex

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

RowStatus
TEXTUAL-CONVENTION

OIDs

OID symbolic	OID numeric	Type	Access	Description
NUM clabTopoChFnCfgChIfIndex	1.3.6.1.4.1.4491.4.2.1.2.1.1	InterfaceIndex	not-accessible	This key represents the interface index of an upstream or downstream channel associated with this fiber node. In the upstream direction, only ifIndices docsCableUpstream channels are reflected.
clabTopoChFnCfgEntry	1.3.6.1.4.1.4491.4.2.1.2.1		not-accessible	The conceptual row of clabTopoChFnCfg. The CMTS persists all instances of ChFnCfg across reinitializations.
ROW clabTopoChFnCfgRowStatus	1.3.6.1.4.1.4491.4.2.1.2.1.2	RowStatus	read-create	The status of this instance.
clabTopoChFnCfgTable	1.3.6.1.4.1.4491.4.2.1.2		not-accessible	This object defines the RF topology by defining the connectivity of a CMTS's downstream and upstream channels to the fiber nodes. Each instance of this object describes connectivity of one downstream or upstream channel with a single fiber node. This object supports the creation and deletion of multiple instances.
clabTopoCompliance	1.3.6.1.4.1.4491.4.2.2.1.1			The compliance statement for devices that implement the CableLabs Topology MIB.
clabTopoFiberNodeCfgEntry	1.3.6.1.4.1.4491.4.2.1.1.1		not-accessible	The conceptual row of clabTopoFiberNodeCfg. The CMTS persists all instances of FiberNodeCfg across reinitializations.
STR clabTopoFiberNodeCfgNodeDescr	1.3.6.1.4.1.4491.4.2.1.1.1.2	SnmpAdminString	read-create	Administratively configured human-readable description of the fiber node
NOD clabTopoFiberNodeCfgNodeName	1.3.6.1.4.1.4491.4.2.1.1.1.1	NodeName	not-accessible	This key represents a human-readable name for a fiber node.
ROW clabTopoFiberNodeCfgRowStatus	1.3.6.1.4.1.4491.4.2.1.1.1.3	RowStatus	read-create	The status of this instance.
clabTopoFiberNodeCfgTable	1.3.6.1.4.1.4491.4.2.1.1		not-accessible	This object defines the cable HFC plant Fiber Nodes known at a CMTS. This object supports the creation and deletion of multiple instances.
clabTopoGroup	1.3.6.1.4.1.4491.4.2.2.2.1			Group of objects implemented in the CMTS.
clabTopoMib	1.3.6.1.4.1.4491.4.2			Licensed under the Apache License, Version 2.0 (the 'License'); you may not use this file except in compliance with the License. You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an 'AS IS' BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. This MIB module contains the management objects for the management of fiber nodes in the Cable plant. Copyright 2006-2017 Cable Television Laboratories, Inc. All rights reserved.
clabTopoMibCompliances	1.3.6.1.4.1.4491.4.2.2.1
clabTopoMibConformance	1.3.6.1.4.1.4491.4.2.2
clabTopoMibGroups	1.3.6.1.4.1.4491.4.2.2.2
clabTopoMibObjects	1.3.6.1.4.1.4491.4.2.1

FAQ

How does CLAB-TOPO-MIB help a cable operator investigate a service outage?
It maps RF channels to the fiber nodes serving them via named fiber-node entries and per-channel associations, so when an outage is reported, an operator uses these mappings to identify which physical fiber node and which downstream/upstream channels are affected before drilling into channel-level status in DOCS-IF-MIB.

Does CLAB-TOPO-MIB report channel performance or faults directly?
No, it's a topology/identification MIB -- fiber node names, descriptions, channel associations, and row status -- rather than a fault or performance MIB; it's meant to be used alongside DOCSIS modules like DOCS-IF-MIB that report actual channel-level status and performance data.

RFC description

CableLabs management of cable plant fiber node topology and connectivity.

Start monitoring CableLabs DOCSIS cable network topology (vendor-neutral) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CLAB-TOPO-MIB

What Is CLAB-TOPO-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

FAQ

RFC description