BAS-UDP-MIB

All MIBs › BAS-UDP-MIB

Organization: Broadband Access Systems

Last Updated: 1998-10-07

Category: DOCSIS and Cable, IP and Core Protocols

Description: Monitors UDP datagram statistics and listener table on the BAS CMTS management plane.

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What Is BAS-UDP-MIB?

BAS-UDP-MIB is a vendor-specific MIB for the Broadband Access System (BAS) CMTS platform's IP-forwarding component, providing UDP protocol statistics analogous to the standard UDP-MIB but scoped per chassis/slot/line-card location within the CMTS. It exposes counters for datagrams sent and received, datagrams with no matching listener, and input errors, along with a listener table, tracked per chassis/slot/interface/port location. For monitoring, this MIB's UDP error and drop counters are direct software-health indicators of the CMTS's management/control-plane IP stack, revealing issues like misdirected DOCSIS/DHCP-related UDP traffic or a struggling forwarding engine on a specific slot. It closely mirrors the standard IETF UDP-MIB (RFC 4113) in object naming/semantics but is scoped to the BAS chassis's distributed slot architecture rather than a single host. Typical deployment context is a cable operator's multi-slot Broadband Access System CMTS chassis, where per-slot UDP statistics help isolate a faulty line card from a chassis-wide network issue. Network engineers evaluating or troubleshooting this functionality can download the BAS-UDP-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in BAS-UDP-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 System (BAS) CMTS chassis

Monitoring Examples

An operator would poll basUdpGroupTable/basUdpGroupEntry, keyed by basUdpGroupChassis, basUdpGroupSlot, and basUdpGroupLPort, to isolate UDP statistics to a specific line card, then check basUdpInErrors and basUdpNoPorts on that group for a rising error count indicating a misconfigured DHCP/TFTP forwarding path on that slot. basUdpInDatagrams versus basUdpOutDatagrams trends would reveal whether control-plane UDP traffic is flowing normally or has stalled on a particular slot. Comparing basUdpTable/basUdpEntry values across chassis/slot combinations helps pinpoint whether a UDP-related fault is chassis-wide or isolated to one card.

What Can Be Monitored

UDP datagrams in/out
UDP no-port (unreachable) errors
UDP input errors
per-chassis/slot/port UDP statistics
UDP listener table

Imported Objects

From BAS-MIB

BasChassisId
BasInterfaceId
BasLogicalPortId
BasSlotId
basAliasUdp	OBJECT-IDENTITY

From SNMPv2-SMI

Counter32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using basUdpInDatagrams OID:

Select a Broadband Access Systems (BAS) CMT (legacy) 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 basUdpInDatagrams 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 total number of UDP datagrams delivered to UDP users. 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 a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
basAliasUdpMIB	1.3.6.1.4.1.3493.2.7.4.1			This module defines the MIB objects for a Broadband Access System IP Forwarding component.
basUdpObjects	1.3.6.1.4.1.3493.2.7.4.1.1
basUdpGroupTable	1.3.6.1.4.1.3493.2.7.4.1.1.1		not-accessible	Aliased UDP group objects.
basUdpGroupEntry	1.3.6.1.4.1.3493.2.7.4.1.1.1.1		not-accessible
C32 basUdpInDatagramsEx	1.3.6.1.4.1.3493.2.7.4.1.1.1.1.1	Counter32	read-only	The total number of UDP datagrams delivered to UDP users.
C32 basUdpNoPorts	1.3.6.1.4.1.3493.2.7.4.1.1.1.1.2	Counter32	read-only	The total number of received UDP datagrams for which there was no application at the destination port.
C32 basUdpInErrors	1.3.6.1.4.1.3493.2.7.4.1.1.1.1.3	Counter32	read-only	The number of received UDP datagrams that could not be delivered for reasons other than the lack of an application at the destination port.
C32 basUdpOutDatagrams	1.3.6.1.4.1.3493.2.7.4.1.1.1.1.4	Counter32	read-only	The total number of UDP datagrams sent from this entity.
BAS basUdpGroupChassis	1.3.6.1.4.1.3493.2.7.4.1.1.1.1.5	BasChassisId	not-accessible	The BAS Chassis ID of the Route Server.
BAS basUdpGroupSlot	1.3.6.1.4.1.3493.2.7.4.1.1.1.1.6	BasSlotId	not-accessible	The BAS Slot ID of the Route Server.
NUM basUdpGroupIf	1.3.6.1.4.1.3493.2.7.4.1.1.1.1.7	BasInterfaceId	not-accessible	The BAS interface ID of the Route Server.
BAS basUdpGroupLPort	1.3.6.1.4.1.3493.2.7.4.1.1.1.1.8	BasLogicalPortId	not-accessible	The BAS logical port ID of the Route Server.
basUdpTable	1.3.6.1.4.1.3493.2.7.4.1.1.2		not-accessible	A table containing UDP listener information.
basUdpEntry	1.3.6.1.4.1.3493.2.7.4.1.1.2.1		not-accessible	Information about a particular current UDP listener.
IP basUdpLocalAddress	1.3.6.1.4.1.3493.2.7.4.1.1.2.1.1	IpAddress	read-only	The local IP address for this UDP listener. In the case of a UDP listener which is willing to accept datagrams for any IP interface associated with the node, the value 0.0.0.0 is used.
INT basUdpLocalPort	1.3.6.1.4.1.3493.2.7.4.1.1.2.1.2	INTEGER	read-only	The local port number for this UDP listener.
BAS basUdpLisChassis	1.3.6.1.4.1.3493.2.7.4.1.1.2.1.3	BasChassisId	not-accessible	The BAS Chassis ID of the Route Server.
BAS basUdpLisSlot	1.3.6.1.4.1.3493.2.7.4.1.1.2.1.4	BasSlotId	not-accessible	The BAS Slot ID of the Route Server.
NUM basUdpLisIf	1.3.6.1.4.1.3493.2.7.4.1.1.2.1.5	BasInterfaceId	not-accessible	The BAS interface ID of the Route Server.
BAS basUdpLisLPort	1.3.6.1.4.1.3493.2.7.4.1.1.2.1.6	BasLogicalPortId	not-accessible	The BAS logical port ID of the Route Server.

RFC description

UDP protocol statistics and monitoring for Broadband Access Systems IP forwarding component on per-port basis.

Start monitoring Broadband Access Systems (BAS) CMTS (legacy) 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-UDP-MIB