CISCO-DSG-IF-EXT-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2011-09-09

Category: Cisco Devices, DOCSIS and Cable

Description: Provides Cisco-specific extensions for DOCSIS Set-top Gateway (DSG) interface management on Cisco CMTS platforms.

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What Is CISCO-DSG-IF-EXT-MIB?

CISCO-DSG-IF-EXT-MIB extends the ITU-T DSG-IF-MIB (J.128) standard to add Cisco-specific management objects for DOCSIS Set-top Gateway (DSG) functionality on Cisco CMTS cable platforms. It exposes configuration data for DSG classifiers (matching by source/destination hostname) and downstream tunnel settings, including the ability to enable or disable DSG delivery on a given downstream. It is primarily a configuration MIB used to verify that out-of-band messaging tunnels to cable set-top boxes are correctly provisioned rather than a hardware-health MIB, though misconfiguration here directly affects whether set-tops receive OOB signaling. It has a clear and notable dependency on the standard DSG-IF-MIB (ITU-T J.128), which it supplements with Cisco-specific classifier and downstream objects. It is deployed on Cisco Cable Modem Termination System (CMTS) platforms serving DOCSIS Set-top Gateway tunnels to cable set-top boxes. Engineers can download the CISCO-DSG-IF-EXT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-DSG-IF-EXT-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

Cisco CMTS (Cable Modem Termination System)

Monitoring Examples

An operator would walk cdsgIfExtClassifierTable/cdsgIfExtClassifierEntry to verify cdsgIfExtClassSrcHostName and cdsgIfExtClassDestHostName classifiers are correctly matching intended traffic, and check cdsgIfExtDownstreamTable/cdsgIfExtDownstreamEntry's cdsgIfExtDownDsgDisable flag per downstream. A downstream unexpectedly showing cdsgIfExtDownDsgDisable set to true would explain why set-top boxes on that downstream are not receiving DSG tunnel messages.

What Can Be Monitored

DSG classifier source/destination hostnames
per-downstream DSG enable/disable state
DSG tunnel configuration

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From DSG-IF-MIB

dsgIfClassifierEntry	OBJECT-TYPE
dsgIfDownstreamEntry	OBJECT-TYPE

From INET-ADDRESS-MIB

InetAddressDNS

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoDsgIfExtMIB	1.3.6.1.4.1.9.9.777			A MIB module for extending the DSG-IF-MIB (ITU-T J.128 10/2008) to add objects which provide additional management information about DOCSIS Set-top Gateway (DSG) not available in DSG-IF-MIB. The DSG provides a one-way IP datagram transport for Out-Of-Band (OOB) messaging to cable set-top clients. The one-way IP datagram transport is called a DSG Tunnel. A DSG Tunnel carrying either a broadcast, unicast or multicast IP datagram stream originating at the DOCSIS Set-top Gateway and carrying Out-Of-Band messages intended for set-top clients. It is carried over one or more downstream DOCSIS channels. Multiple DSG tunnels may exist on a single downstream DOCSIS channel.
ciscoDsgIfExtMIBNotifs	1.3.6.1.4.1.9.9.777.0
ciscoDsgIfExtMIBObjects	1.3.6.1.4.1.9.9.777.1
cdsgIfExtClassifierTable	1.3.6.1.4.1.9.9.777.1.1		not-accessible	This table extends DSG-IF-MIB dsgIfClassifierTable for classifiers which classify inbound packets into the tunnel and classifiers for the DSG clients, encoding in the DCD (Downstream Channel Descriptor) messages on the downstream channels to which the classifiers apply.
cdsgIfExtClassifierEntry	1.3.6.1.4.1.9.9.777.1.1.1		not-accessible	A cdsgIfExtClassifierEntry extends a corresponding dsgIfClassifierTable entry. This entry provides additional information for a particular ADSG classifier of the DSG-IF-MIB dsgIfClassifierEntry. For example, the configuration of the fully qualified domain name (FQDN) of ADSG classifier multicast group and source addresses. An entry in this table exists for each configured ADSG classifier in DSG-IF-MIB dsgIfClassifierTable.
ADR cdsgIfExtClassSrcHostName	1.3.6.1.4.1.9.9.777.1.1.1.1	InetAddressDNS	read-write	This object specifies the multicast source FQDN of which the CMTS (Cable Modem Termination System) would be able to utilize the CMTS configured domain name server(s) to conduct a lookup and then define the IGMP join with the lookup response.
ADR cdsgIfExtClassDestHostName	1.3.6.1.4.1.9.9.777.1.1.1.2	InetAddressDNS	read-write	This object specifies the multicast group FQDN of which the CMTS would be able to utilize the CMTS configured domain name server(s) to conduct a lookup and then define the IGMP join with the lookup response.
cdsgIfExtDownstreamTable	1.3.6.1.4.1.9.9.777.1.2		not-accessible	This table extends DSG-IF-MIB dsgIfDownstreamTable for ADSG downstream tunnels.
cdsgIfExtDownstreamEntry	1.3.6.1.4.1.9.9.777.1.2.1		not-accessible	A cdsgIfExtDownstreamEntry extends a corresponding dsgIfDownstreamEntry. This entry displays and controls more characteristics of ADSG downstream tunnel. For example, provide management information that CMTS would has the ability to turn off DSG forwarding on certain primary interfaces where the DSG tunnels are not required.
T/F cdsgIfExtDownDsgDisable	1.3.6.1.4.1.9.9.777.1.2.1.1	TruthValue	read-write	This object specifies whether the DSG tunnel is disabled on the primary interface. A value of 'true' indicates that the DSG tunnel is disabled on the primary interface. A value of 'false' indicates that the DSG tunnel is not disabled on the primary interface.
ciscoDsgIfExtMIBConform	1.3.6.1.4.1.9.9.777.2
ciscoDsgIfExtMIBCompliances	1.3.6.1.4.1.9.9.777.2.1
ciscoDsgIfExtMIBCompliance	1.3.6.1.4.1.9.9.777.2.1.1			This compliance statement for CISCO-DSG-IF-EXT-MIB.
ciscoDsgIfExtMIBGroups	1.3.6.1.4.1.9.9.777.2.2
cdsgIfExtHostGroup	1.3.6.1.4.1.9.9.777.2.2.1			A collection of objects which provides fully qualified domain name of classifier multicast group and source addresses of DOCSIS Set-top Gateway systems.
cdsgIfExtDownControlGroup	1.3.6.1.4.1.9.9.777.2.2.2			A collection of objects which provides control of DSG tunnel for DOCSIS Set-top Gateway systems.

RFC description

Extends DSG-IF-MIB with additional management objects for DOCSIS Set-top Gateway tunneling and classifier configuration.

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Download CISCO-DSG-IF-EXT-MIB

What Is CISCO-DSG-IF-EXT-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description