ISLVLAN-MIB

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Organization: Hewlett-Packard NetMetrix Division

Category: Network Interfaces, Technology: VLAN, VLAN and Bridging, Vendor: HP/HPE

Description: Hewlett-Packard NetMetrix ISL (Inter-Switch Link) VLAN MIB providing SNMP objects for Cisco ISL VLAN tagging monitoring.

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What Is ISLVLAN-MIB?

ISLVLAN-MIB, published as part of HP NetMetrix tooling, provides SNMP objects for monitoring Cisco ISL (Inter-Switch Link) VLAN tagging on switches. It exposes configuration and status data about VLAN trunk control (data source, VTP domain, VTP community, enable state) and the mapping of VLAN IDs learned or configured over ISL trunks. Its monitoring value is centered on VLAN/trunking configuration and connectivity status rather than hardware environmental metrics, letting operators verify that VLAN trunking and VTP domain membership are correctly configured across ISL links. It is explicitly tied to Cisco's ISL and VTP (VLAN Trunking Protocol) technologies, making it dependent on those Cisco-specific standards rather than IETF ones. It is typically deployed in HP NetMetrix-managed networks that include Cisco switches using legacy ISL trunking for VLAN tagging. Network engineers evaluating or troubleshooting this functionality can download the ISLVLAN-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in ISLVLAN-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 switches using ISL trunking (monitored via HP NetMetrix)

Monitoring Examples

An administrator would inspect islVlanControlTable, indexed by islVlanControlIndex, to verify islVlanControlVtpDomain and islVlanControlVtpCommunity match the expected VTP domain, and check islVlanControlEnable to confirm ISL monitoring is active on a given interface. islVlanTable, keyed by islVlanId, would then be polled to enumerate which VLANs are actually present on the ISL trunk, revealing VLAN misconfiguration if expected VLANs are missing.

What Can Be Monitored

ISL VLAN control/enable state
VTP domain and community
VLANs present on ISL trunk
ISL data source per interface

Imported Objects

From IF-MIB

InterfaceIndex
ifIndex	OBJECT-TYPE

From RMON-MIB

OwnerString

From SNMPv2-SMI

Integer32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE
enterprises

From SNMPv2-TC

DisplayString
RowStatus

OIDs

OID symbolic	OID numeric	Type	Access	Description
hp	1.3.6.1.4.1.11
nm	1.3.6.1.4.1.11.2
interface	1.3.6.1.4.1.11.2.4
islVlanMIB	1.3.6.1.4.1.11.2.4.9			The MIB module to configure Cisco ISL VLAN monitoring.
islVlanMIBObjects	1.3.6.1.4.1.11.2.4.9.1
islVlanControlTable	1.3.6.1.4.1.11.2.4.9.1.1		not-accessible	A list ISL VLAN control entries, one for each 100BaseT interface. This table should survive warm-boots and power losses.
islVlanControlEntry	1.3.6.1.4.1.11.2.4.9.1.1.1		not-accessible	An entry that controls the ISL behavior on a particular 100BaseT interface.
INT islVlanControlIndex	1.3.6.1.4.1.11.2.4.9.1.1.1.1	INTEGER	not-accessible	The value of this object uniquely identifies this islVlanControlTable entry.
OID islVlanControlDataSource	1.3.6.1.4.1.11.2.4.9.1.1.1.2	OBJECT IDENTIFIER	read-only	This contains the OID of the ifIndex of the interface this entry controls. The corresponding ifType ethernetCsmacd(6).
IP islVlanControlVtpDomain	1.3.6.1.4.1.11.2.4.9.1.1.1.3	IpAddress	read-write	The IP address of the Cisco VTP server of VLANs monitored by this interface.
STR islVlanControlVtpCommunity	1.3.6.1.4.1.11.2.4.9.1.1.1.4	DisplayString	read-write	The SNMP community string for the Cisco VTP server of VLANs monitored by this interface.
INT islVlanControlEnable	1.3.6.1.4.1.11.2.4.9.1.1.1.5	INTEGER	read-write	Indicate the behavior for processing ISL VLAN packets. A value of disabled(1) means that no per-VLAN monitoring happens on this interface. A value of explicitlyOnly(2) means that only VLANs that correspond to an islVlanEntry that was explicitly created by a management application. If the probe sees an ISL packet that doesn't correspond to an explicitly created islVlanEntry, the probe will not process the packet in any per-VLAN tables. A value of implicitCreate(3) means that a new islVlanEntry is automatically created when a ISL packet is seen with an unknown VLAN ID.
islVlanTable	1.3.6.1.4.1.11.2.4.9.1.2		not-accessible	The ISL VLAN able stores the information needed to monitor Cisco ISL VLAN traffic on an inter-switch trunk line. This table should survive warm-boots and power losses.
islVlanEntry	1.3.6.1.4.1.11.2.4.9.1.2.1		not-accessible	An entry in the islVlanTable. An entry can be created two ways. A management application can explicitly create an entry. Or, an entry can be automatically created if an unknown ISL ID is seen on an interface (see islVlanControlEnable.)
INT islVlanIndex	1.3.6.1.4.1.11.2.4.9.1.2.1.1	INTEGER	not-accessible	The value of this object uniquely identifies this islVlanTable entry.
INT islVlanControlEntryIndex	1.3.6.1.4.1.11.2.4.9.1.2.1.2	INTEGER	read-create	Indicates the islVlanControlIndex of the corresponding islVlanControlEntry.
INT islVlanId	1.3.6.1.4.1.11.2.4.9.1.2.1.3	INTEGER	read-create	The value of this object ISL VLAN ID for this particular VLAN on this interface.
NUM islVlanIfIndex	1.3.6.1.4.1.11.2.4.9.1.2.1.4	InterfaceIndex	read-only	A unique identifier associated with this islVlanTable entry. This value should not be same as any existing or future ifIndex/pvcIndex value. This value must remain constant from when its creation until its explicit deletion.
STR islVlanName	1.3.6.1.4.1.11.2.4.9.1.2.1.5	DisplayString	read-write	This contains the VLAN name. If the entry was created automatically by the probe, its value is `unknown VLAN '. A management application is free to change this name at any time.
I32 islVlanMtu	1.3.6.1.4.1.11.2.4.9.1.2.1.6	Integer32	read-write	The maximum transmission unit size for this VLAN. If this was created automatically, this value not be known and should be set to 0.
STR islVlanOwner	1.3.6.1.4.1.11.2.4.9.1.2.1.7	OwnerString	read-create	The entity that configured this entry. If this was automatically created by the probe, the value is `monitor'.
ROW islVlanStatus	1.3.6.1.4.1.11.2.4.9.1.2.1.8	RowStatus	read-write	The status of this islVlanTable entry.

RFC description

Cisco ISL VLAN configuration MIB for Hewlett-Packard network monitoring and VLAN data source specification.

Start monitoring Cisco switch using ISL trunking (monitored via HP NetMetrix) 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 ISLVLAN-MIB

What Is ISLVLAN-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description