XYLANPNNI-MIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsXYLANPNNI-MIB

Organization: Xylan

Last Updated: 1998-10-19

Category: Xylan OmniSwitch

Description: Manages Xylan OmniSwitch ATM PNNI routing protocol peer groups, topology state, and path selection.

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What Is XYLANPNNI-MIB?

XYLANPNNI-MIB is a vendor-specific enterprise MIB from Xylan Corporation (later absorbed into Alcatel) that extends the ATM Forum's standard PNNI (Private Network-to-Network Interface) MIB with additional objects for Xylan OmniSwitch ATM switches. It exposes data on PNNI node naming and hierarchy, address-prefix filtering rules used to control route advertisement, and inter-domain adjacency (I-Adjacency) relationships within the ATM routing topology. Rather than classic hardware sensors, its monitoring value lies in software/protocol status: node and adjacency operational state reveal whether the ATM control plane is healthy, converged, and correctly filtering reachability information, which is the functional equivalent of a software-health signal for the PNNI routing process. It is explicitly built as an add-on to the ATM Forum's standard PNNI MIB and cannot be fully interpreted without that base specification. It was typically deployed in legacy carrier or large-enterprise ATM backbones built on Xylan/Alcatel OmniSwitch hardware for hierarchical PNNI-based call routing. Engineers can download the XYLANPNNI-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in XYLANPNNI-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

  • Xylan OmniSwitch ATM switch
  • Alcatel OmniSwitch (Xylan lineage)

Monitoring Examples

An administrator would poll xPnniAssociativeNameTable/xPnniNameEntry, keyed by xPnniNodeIndex, to resolve xPnniNodeId values into human-readable xPnniNodeName strings for topology diagrams and fault reports. Checking xPnniAddressFilterTable/xPnniAddressFilterEntry (xPnniFiltNodeLevel, xPnniFiltSrcPrefix/xPnniFiltSrcPrefLen, xPnniFiltDestPrefix/xPnniFiltDestPrefLen) shows which ATM address prefixes are filtered at a given PNNI hierarchy level, helping diagnose unexpected loss of reachability. Reviewing xPnniIAdjGroup objects confirms whether expected inter-domain adjacencies are up, which would reveal a routing peer failure if absent.

What Can Be Monitored

  • PNNI node names and IDs
  • PNNI node hierarchy level
  • address filter prefixes (source/destination)
  • inter-domain adjacency status
  • ATM routing topology state
Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter

From RFC1213-MIB

DisplayString

From SNMPv2-SMI

MODULE-IDENTITY
Unsigned32

From SNMPv2-TC

TimeStamp
TruthValue

From XYLAN-BASE-MIB

xylanPnniOBJECT-IDENTITY
OIDs

RFC description

Private Network-Network Interface (PNNI) extensions for Alcatel ATM switches and address filtering.

Start monitoring Xylan/Alcatel OmniSwitch ATM switches 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 XYLANPNNI-MIB