XYLAN-HREX-MIB

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Category: Xylan OmniSwitch

Description: Extends Xylan OmniSwitch host resource management with additional storage and processor utilization objects.

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What Is XYLAN-HREX-MIB?

XYLAN-HREX-MIB is a Xylan (OmniSwitch, later Alcatel) enterprise MIB extending host-resource-style monitoring with switch-internal register, hashing, and packet-forwarding statistics. It exposes a register configuration table alongside IP and IPX packet counters (received, forwarded, discarded) and CAM/hash-table utilization figures. This MIB is used heavily to monitor hardware resource utilization and forwarding-plane health on the switch: administrators track packet discard counts to spot forwarding problems, and watch the pseudo-CAM hash total to see whether the switch's internal lookup hash table is nearing capacity. It is a Xylan-proprietary extension that complements, rather than replaces, the standard Host Resources MIB and Interfaces MIB on the same chassis. It is deployed on Xylan/Alcatel OmniSwitch chassis where administrators need visibility into internal forwarding-table and hashing resource consumption alongside standard interface counters. Engineers can download the XYLAN-HREX-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in XYLAN-HREX-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/Alcatel OmniSwitch chassis

Monitoring Examples

An administrator would poll xylanHrexIpPacketsDiscarded and xylanHrexIpxPacketsDiscarded to detect a rising drop rate, then check xylanHrexPseudoCamHashTotal alongside xylanHrexHash utilization figures to confirm whether the drops stem from a full or overloaded internal hash/CAM table. The xylanHrexRegisterTable (xylanHrexRegisterEntry, indexed by xylanHrexRegisterNumber) with its xylanHrexRegisterAllowType and xylanHrexRegisterUseType objects lets an operator confirm which internal hardware registers are allocated and for what purpose. Comparing xylanHrexIpPacketsReceived against xylanHrexIpPacketsForwarded over time reveals the switch's forwarding efficiency for IP traffic.

What Can Be Monitored

IP/IPX packets received, forwarded, discarded
CAM/hash table utilization
internal register allocation and usage type
forwarding-plane resource utilization

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter

From XYLAN-BASE-MIB

xylanHrexArch

OBJECT-IDENTITY

OIDs

OID symbolic	OID numeric	Type	Access	Description
xylanHrexRegisterTable	1.3.6.1.4.1.800.2.31.1		not-accessible	Entry for an HRE-X Router Port MAC register.
xylanHrexRegisterEntry	1.3.6.1.4.1.800.2.31.1.1		not-accessible	Each entry corresponds to a single register.
INT xylanHrexRegisterNumber	1.3.6.1.4.1.800.2.31.1.1.1	INTEGER	read-only	The number of the HRE-X Router Port MAC register.
INT xylanHrexRegisterAllowType	1.3.6.1.4.1.800.2.31.1.1.2	INTEGER	read-write	The service type that is permitted for the HRE-X Router Router Port MAC register.
INT xylanHrexRegisterUseType	1.3.6.1.4.1.800.2.31.1.1.3	INTEGER	read-only	The service type to which the register has been allocated.
xylanHrexStatistics	1.3.6.1.4.1.800.2.31.2
CTR xylanHrexIpPacketsReceived	1.3.6.1.4.1.800.2.31.2.1	Counter	read-only	The count of IP packets received by the HRE-Xs.
CTR xylanHrexIpPacketsForwarded	1.3.6.1.4.1.800.2.31.2.2	Counter	read-only	The count of IP packets forwarded by the HRE-Xs.
CTR xylanHrexIpPacketsDiscarded	1.3.6.1.4.1.800.2.31.2.3	Counter	read-only	The count of IP packets discarded by the HRE-Xs.
CTR xylanHrexIpxPacketsReceived	1.3.6.1.4.1.800.2.31.2.4	Counter	read-only	The count of IPX packets received by the HRE-Xs.
CTR xylanHrexIpxPacketsForwarded	1.3.6.1.4.1.800.2.31.2.5	Counter	read-only	The count of IPX packets forwarded by the HRE-Xs.
CTR xylanHrexIpxPacketsDiscarded	1.3.6.1.4.1.800.2.31.2.6	Counter	read-only	The count of IPX packets discarded by the HRE-Xs.
xylanHrexUtilization	1.3.6.1.4.1.800.2.31.3
CTR xylanHrexPseudoCamHashTotal	1.3.6.1.4.1.800.2.31.3.1	Counter	read-only	The total number of HRE-X PseudoCAM hash entries that are configured for use.
CTR xylanHrexPseudoCamHashFree	1.3.6.1.4.1.800.2.31.3.2	Counter	read-only	The total number of HRE-X PseudoCAM hash entries that are currently not in use.
CTR xylanHrexPseudoCamCollisionTotal	1.3.6.1.4.1.800.2.31.3.3	Counter	read-only	The total number of HRE-X PseudoCAM collision entries that are configured for use.
CTR xylanHrexPseudoCamCollisionFree	1.3.6.1.4.1.800.2.31.3.4	Counter	read-only	The total number of HRE-X PseudoCAM collision entries that are currently not in use.
CTR xylanHrexCacheTotal	1.3.6.1.4.1.800.2.31.3.5	Counter	read-only	The total number of HRE-X Cache entries that are configured for use.
CTR xylanHrexCacheFree	1.3.6.1.4.1.800.2.31.3.6	Counter	read-only	The total number of HRE-X cache entries that are currently not in use.
CTR xylanHrexCollisionLengthMax	1.3.6.1.4.1.800.2.31.3.7	Counter	read-only	The longest collision chain currently in use in the HRE-X.
CTR xylanHrexCollisionLengthAvg	1.3.6.1.4.1.800.2.31.3.8	Counter	read-only	The average collision chain length currently in use in the HRE-X.
xylanHrexHash	1.3.6.1.4.1.800.2.31.4
INT xylanHrexHashOptimize	1.3.6.1.4.1.800.2.31.4.1	INTEGER	write-only	Causes the switch to compute an optimized hash function for the HRE-X PseudoCAM and to program this into the HRE-X(s).
INT xylanHrexHashDefault	1.3.6.1.4.1.800.2.31.4.2	INTEGER	write-only	Causes the switch to restore the hash function for the HRE-X PseudoCAM to the default value and to program this into the HRE-X(s).

RFC description

Alcatel Internetworking HRE-X router port MAC register and configuration management MIB.

Start monitoring Xylan/Alcatel OmniSwitch chassis (IP/IPX packet-forwarding counter, CAM/hash-table-utilization status) 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 XYLAN-HREX-MIB

What Is XYLAN-HREX-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description