BAS-TOPOLOGY-MIB

All MIBs › BAS-TOPOLOGY-MIB

Organization: Broadband Access Systems

Last Updated: 1998-12-01

Category: DOCSIS and Cable, Routing Protocols

Description: Provides network topology discovery and adjacency mapping objects for BAS CMTS platforms.

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What Is BAS-TOPOLOGY-MIB?

BAS-TOPOLOGY-MIB provides network topology discovery and chassis-cluster adjacency mapping for Broadband Access Systems CMTS platforms. It exposes tables describing chassis, slot, interface, and physical port relationships, including chassis type and per-slot information, letting a management station reconstruct the physical/logical layout of a multi-chassis CMTS cluster. Because it reports basChassisTopStatus and related per-slot status, it functions as a hardware presence/health indicator, revealing when a chassis or slot has dropped out of the expected cluster topology. It is a proprietary companion to the BAS-ALIAS-IP-MIB and BAS-PBRF-RIP-MIB family, sharing the same chassis/slot/interface indexing scheme. It is typically deployed in cable head-ends to monitor the health and interconnection of clustered CMTS chassis. Engineers can download the BAS-TOPOLOGY-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in BAS-TOPOLOGY-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

Broadband Access Systems CMTS chassis cluster

Monitoring Examples

An operator polling basChassisTopTable/basChassisTopEntry for basChassisTopChassisType and basChassisTopStatus across every basChassisTopChassisNumber would confirm each chassis in the cluster is present and correctly identified. The related basSlotTopTable/basSlotTopEntry drills down to per-slot topology, so a slot that stops reporting or shows unexpected slot information would flag a card failure or cabling issue in the cluster interconnect.

What Can Be Monitored

chassis/slot topology mapping
chassis type and count
slot presence/status
cluster interconnect health

Imported Objects

From BAS-MIB

BasCardClass
BasChassisId
BasChassisType
BasIfClass
BasInterfaceId
BasLogicalPortId
BasSlotId
basTopology	OBJECT-IDENTITY

From IANAifType-MIB

IANAifType

From IF-MIB

InterfaceIndex
ifEntry	OBJECT-TYPE

From SNMPv2-SMI

Integer32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using basChassisTopStatus OID:

Select a Broadband Access Systems CMTS device as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type basChassisTopStatus into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The current operational state of this chassis. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is an INTEGER-type OID, Value bounds is the most useful condition here — trigger an alert if the value is anything other than 'up', since that indicates the condition this object reports has changed to one worth investigating. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
basTopologyMIB	1.3.6.1.4.1.3493.2.9.1			The MIB module for defining Broadband Access System Cluster topology.
basChassisTopTable	1.3.6.1.4.1.3493.2.9.1.1		not-accessible	A table of chassis contained in a BAS cluster.
basChassisTopEntry	1.3.6.1.4.1.3493.2.9.1.1.1		not-accessible
BAS basChassisTopChassis	1.3.6.1.4.1.3493.2.9.1.1.1.1	BasChassisId	not-accessible	The chassis identifier of this chassis.
BAS basChassisTopSlot	1.3.6.1.4.1.3493.2.9.1.1.1.2	BasSlotId	not-accessible	The BAS slot ID of this card.
NUM basChassisTopIf	1.3.6.1.4.1.3493.2.9.1.1.1.3	BasInterfaceId	not-accessible	The BAS interface ID of this card.
BAS basChassisTopLPort	1.3.6.1.4.1.3493.2.9.1.1.1.4	BasLogicalPortId	not-accessible	The BAS logical port ID of this card.
I32 basChassisTopChassisNumber	1.3.6.1.4.1.3493.2.9.1.1.1.5	Integer32	read-only	The chassis number of this chassis.
BAS basChassisTopChassisType	1.3.6.1.4.1.3493.2.9.1.1.1.6	BasChassisType	read-only	The chassis type of this chassis.
OCT basChassisTopSlotInfo	1.3.6.1.4.1.3493.2.9.1.1.1.7	OCTET STRING	read-only	This object is used to identify the number of slots contained in a chassis, the type of card contained in populated slots, and if a populated slot contains at least one ICL link. The length of this OCTET STRING indicates the number of slots in the chassis. The encoding of each OCTET is defined below: bits 0-5 Card Type. bit 6 If 1, slot contains at least one ICL link. If 0, slot contains no ICL links. bit 7 Unused.
INT basChassisTopStatusEx	1.3.6.1.4.1.3493.2.9.1.1.1.8	INTEGER	read-only	The current operational state of this chassis.
basSlotTopTable	1.3.6.1.4.1.3493.2.9.1.2		not-accessible	A table of slots contained in each chassis that make up a BAS cluster.
basSlotTopEntry	1.3.6.1.4.1.3493.2.9.1.2.1		not-accessible
BAS basSlotTopChassis	1.3.6.1.4.1.3493.2.9.1.2.1.1	BasChassisId	not-accessible	The BAS chassis ID of this card
BAS basSlotTopSlot	1.3.6.1.4.1.3493.2.9.1.2.1.2	BasSlotId	not-accessible	The BAS slot ID of this card.
NUM basSlotTopIf	1.3.6.1.4.1.3493.2.9.1.2.1.3	BasInterfaceId	not-accessible	The BAS interface ID of this card.
BAS basSlotTopLPort	1.3.6.1.4.1.3493.2.9.1.2.1.4	BasLogicalPortId	not-accessible	The BAS logical port ID of this card.
BAS basSlotTopACChassis	1.3.6.1.4.1.3493.2.9.1.2.1.5	BasChassisId	not-accessible	The BAS chassis ID of the application card
BAS basSlotTopACSlot	1.3.6.1.4.1.3493.2.9.1.2.1.6	BasSlotId	not-accessible	The BAS slot ID of the application card.
NUM basSlotTopACIf	1.3.6.1.4.1.3493.2.9.1.2.1.7	BasInterfaceId	not-accessible	The BAS interface ID of the application card.
BAS basSlotTopACLPort	1.3.6.1.4.1.3493.2.9.1.2.1.8	BasLogicalPortId	not-accessible	The BAS logical port ID of the application card.
I32 basSlotTopNumberOfIfs	1.3.6.1.4.1.3493.2.9.1.2.1.9	Integer32	read-only	The total number of physical interface on this slot.
OCT basSlotTopIfInfo	1.3.6.1.4.1.3493.2.9.1.2.1.10	OCTET STRING	read-only	This object is used to identify which interfaces in the slot are an ICL interface as well as the type of ICL the interface represents. This object also identifies each end of the ICL. The encoding of this object is defined below. Each interface is encoded as a 3-tuple. The 3-tuple is defined as follows, , where 'Type of ICL' in one byte, 'Local ifIndex' is four bytes, and 'Remote ifIndex' is four bytes. There will be 'Number of Interfaces' 3-tuples contained in this OCTET STRING. The values for each element which make up the 3-tuple can be as follows: 'Type of ICL' 0 indicates this is not an ICL 1 indicates active ICL 2 indicates redundant ICL 'Local ifIndex' 0 if 'Type of ICL' is 0 > 0 if 'Type of ICL' is not 0 'Remote ifIndex' 0 if 'Type of ICL' is 0 > 0 if 'Type of ICL' is not 0
BAS basSlotTopCardType	1.3.6.1.4.1.3493.2.9.1.2.1.11	BasCardClass	read-only	The BAS card class of this slot.
IP basSlotTopInterChassisIP	1.3.6.1.4.1.3493.2.9.1.2.1.12	IpAddress	read-only	The IP address of the .
IP basSlotTopIntraChassisIP	1.3.6.1.4.1.3493.2.9.1.2.1.13	IpAddress	read-only	The IP address of the .
INT basSlotTopStatus	1.3.6.1.4.1.3493.2.9.1.2.1.14	INTEGER	read-only	The current operational state of this slot.
basIfTopTable	1.3.6.1.4.1.3493.2.9.1.3		not-accessible	A table of interfaces on each slot contained in each chassis that make up a BAS cluster.
basIfTopEntry	1.3.6.1.4.1.3493.2.9.1.3.1		not-accessible
BAS basIfTopIfClass	1.3.6.1.4.1.3493.2.9.1.3.1.1	BasIfClass	read-only	The BAS defined class of this interface.
IAN basIfTopIfType	1.3.6.1.4.1.3493.2.9.1.3.1.3	IANAifType	read-only	This is a mirror of ifType defined in the IF-MIB.
NUM basIfTopICLNeighbor	1.3.6.1.4.1.3493.2.9.1.3.1.4	InterfaceIndex	read-only	If the value of basIfTopIfClass is icl(1), then this object will identify the ifIndex of the interface at the far side of the link. Otherwise, the value of this object is zero(0).
INT basIfTopICLMode	1.3.6.1.4.1.3493.2.9.1.3.1.5	INTEGER	read-only	If the value of basIfTopIfClass is icl(1), then this object indicates whether this ICL is acting in an active(1) or redundant(2) mode.
INT basIfTopIfStatus	1.3.6.1.4.1.3493.2.9.1.3.1.6	INTEGER	read-only	The operational state of this interface.
basRSTable	1.3.6.1.4.1.3493.2.9.1.4		not-accessible	A table specifying a list of Route Servers in a BAS cluster.
basRSEntry	1.3.6.1.4.1.3493.2.9.1.4.1		not-accessible	Card specific Route Server information entry.
BAS basRSMgrChassis	1.3.6.1.4.1.3493.2.9.1.4.1.1	BasChassisId	not-accessible	The BAS Chassis ID of this card.
BAS basRSMgrSlot	1.3.6.1.4.1.3493.2.9.1.4.1.2	BasSlotId	not-accessible	The BAS Slot ID of this card.
NUM basRSMgrIf	1.3.6.1.4.1.3493.2.9.1.4.1.3	BasInterfaceId	not-accessible	The BAS interface ID of this card.
BAS basRSMgrLPort	1.3.6.1.4.1.3493.2.9.1.4.1.4	BasLogicalPortId	not-accessible	The BAS logical port ID of this card.
BAS basRSChassis	1.3.6.1.4.1.3493.2.9.1.4.1.5	BasChassisId	read-only	The BAS Chassis ID of a Route Server known by this card.
BAS basRSSlot	1.3.6.1.4.1.3493.2.9.1.4.1.6	BasSlotId	read-only	The BAS Slot ID of a Route Server known by this card.
NUM basRSIf	1.3.6.1.4.1.3493.2.9.1.4.1.7	BasInterfaceId	read-only	The BAS interface ID of a Route Server known by this card.
BAS basRSLPort	1.3.6.1.4.1.3493.2.9.1.4.1.8	BasLogicalPortId	read-only	The BAS logical port ID of a Route Server known by this card.
INT basRSRole	1.3.6.1.4.1.3493.2.9.1.4.1.9	INTEGER	read-only	This object is used to indicate the role the Route Server plays within a BAS cluster.

RFC description

Defines topology information for Broadband Access System cluster chassis and interfaces.

Start monitoring Broadband Access Systems CMTS devices 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 BAS-TOPOLOGY-MIB