ROHC-UNCOMPRESSED-MIB

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Organization: IETF Robust Header Compression Working Group

Last Updated: 2004-06-03

Category: Header Compression

Description: Extends the ROHC MIB with managed objects specific to the RObust Header Compression uncompressed profile.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring ROHC-UNCOMPRESSED-MIB with a free 30-day trial of IPNetwork Monitor.

What Is ROHC-UNCOMPRESSED-MIB?

ROHC-UNCOMPRESSED-MIB is an IETF standards-track MIB (RFC 3816) that extends the general ROHC (RObust Header Compression) MIB with objects specific to the ROHC 'uncompressed' profile (profile 0x0000), used in mobile and wireless network compression contexts. It exposes per-context configuration and state data, including context mode and state machine values, and counters such as acknowledgment (ACK) counts for each compression context. Rather than hardware, its monitoring value is software/protocol status: tracking whether ROHC contexts are operating correctly (e.g., in the expected state/mode) and whether ACK traffic patterns indicate healthy header-compression negotiation between endpoints. It explicitly depends on and extends the base ROHC-MIB, sharing its context table indexing conventions. It is deployed on routers, gateways, and wireless access equipment that implement ROHC for compressing IP/UDP/RTP headers over constrained-bandwidth links. Engineers implementing or auditing this functionality typically reference the ROHC-UNCOMPRESSED-MIB RFC/standard documentation for the authoritative specification.

IPNetwork Monitor allows you to monitor SNMP objects defined in ROHC-UNCOMPRESSED-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, not tied to a specific manufacturer
routers/gateways implementing ROHC header compression
wireless access equipment

Monitoring Examples

An administrator would poll rohcUncmprContextTable/rohcUncmprContextEntry to inspect rohcUncmprContextState and rohcUncmprContextMode for a given compression context, confirming it has reached a stable operating state rather than being stuck in an initialization or error mode. A low or stalled rohcUncmprContextACKs counter for an active context could indicate the compression session is not properly acknowledging packets, signaling a link or negotiation problem between the compressor and decompressor.

What Can Be Monitored

ROHC context state
context compression mode
context ACK counts

Imported Objects

From ROHC-MIB

rohcChannelID	OBJECT-TYPE
rohcContextCID	OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-TYPE
mib-2

How to Use in IPNetwork Monitor

Example using rohcUncmprContextACKs OID:

Select a device implementing ROHC-UNCOMPRESSED-MIB 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 rohcUncmprContextACKs 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 number of all positive feedbacks (ACK) sent or received in this context, respectively. 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
rohcUncmprMIB	1.3.6.1.2.1.113			This MIB module defines a set of objects for monitoring and configuring RObust Header Compression (ROHC). The objects are specific to ROHC uncompressed (profile 0x0000). Copyright (C) The Internet Society (2004). The initial version of this MIB module was published in RFC 3816. For full legal notices see the RFC itself or see: http://www.ietf.org/copyrights/ianamib.html
rohcUncmprObjects	1.3.6.1.2.1.113.1
rohcUncmprContextTable	1.3.6.1.2.1.113.1.1		not-accessible	This table lists and describes ROHC uncompressed profile specific properties of compressor contexts and decompressor contexts. It extends the rohcContextTable of the ROHC-MIB module.
rohcUncmprContextEntry	1.3.6.1.2.1.113.1.1.1		not-accessible	An entry describing a particular context.
INT rohcUncmprContextState	1.3.6.1.2.1.113.1.1.1.3	INTEGER	read-only	State of the context. States initAndRefresh(1) and normal(2) are states of compressor contexts, states noContext(3) and fullContext(4) are states of decompressor contexts.
INT rohcUncmprContextMode	1.3.6.1.2.1.113.1.1.1.4	INTEGER	read-only	Mode of the context.
C32 rohcUncmprContextACKsEx	1.3.6.1.2.1.113.1.1.1.5	Counter32	read-only	The number of all positive feedbacks (ACK) sent or received in this context, respectively. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime. For checking ifCounterDiscontinuityTime, the interface index is required. It can be determined by reading the rohcChannelTable of the ROHC-MIB.
rohcUncmprConformance	1.3.6.1.2.1.113.2
rohcUncmprCompliances	1.3.6.1.2.1.113.2.1
rohcUncmprCompliance	1.3.6.1.2.1.113.2.1.1			The compliance statement for SNMP entities that implement the ROHC-UNCOMPRESSED-MIB. Note that compliance with this compliance statement requires compliance with the rohcCompliance MODULE-COMPLIANCE statement of the ROHC-MIB and with the ifCompliance3 MODULE-COMPLIANCE statement of the IF-MIB (RFC2863).
rohcUncmprGroups	1.3.6.1.2.1.113.2.2
rohcUncmprContextGroup	1.3.6.1.2.1.113.2.2.1			A collection of objects providing information about ROHC uncompressed compressors and decompressors.
rohcUncmprStatisticsGroup	1.3.6.1.2.1.113.2.2.2			An object providing context statistics.

RFC description

Monitors and configures RObust Header Compression (ROHC) profile 0x0000 uncompressed mode for network compression contexts.

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