Fore-Shmem5-MIB

All MIBs › Fore-Shmem5-MIB

Organization: FORE

Last Updated: 1999-11-05

Category: ATM, Vendor: Fore Systems (ATM)

Description: Fore Systems shared memory MIB providing status and utilization objects for shared memory resources in the ForeRunner switch architecture.

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What Is Fore-Shmem5-MIB?

Fore-Shmem5-MIB is a Fore Systems vendor MIB reporting on the shared-memory subsystem ("Shmem5") used inside a network module of the ForeRunner ATM switch architecture. It exposes sizing information for the different memory pools (cell memory, table memory, scheduler memory, overall shared memory) as well as real-time utilization counters such as current multicast/unicast connection counts and cells buffered. Because shared memory is a finite, shared hardware resource that ATM cell switching depends on, this MIB is primarily a hardware resource/performance-health monitor, flagging when a network module is approaching memory exhaustion that would cause cell loss or dropped connections. It is a low-level, module-specific MIB with no dependency on standard MIBs. It is deployed internally by Fore/Marconi switch operators doing deep capacity or performance troubleshooting on a specific netmod card rather than general-purpose network monitoring. Network engineers evaluating or troubleshooting this functionality can download the Fore-Shmem5-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in Fore-Shmem5-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

Fore Systems ForeRunner ATM switch network module

Monitoring Examples

An operator would poll nShmem5CellsBuffered and nShmem5DupListUsed in netmodShmem5Table alongside nShmem5CurrMcastConns and nShmem5CurrUcastConns to see how close the module is to running out of shared buffer or connection capacity. A steadily rising nShmem5CellsBuffered with flat nShmem5SharedMemorySize would predict imminent cell discard, prompting the operator to redistribute load or add capacity. The static sizing objects (nShmem5TableMemorySize, nShmem5SchedulerMemorySize) are mainly useful as a baseline for interpreting the dynamic counters.

What Can Be Monitored

shared memory pool sizes
cells buffered
current multicast connections
current unicast connections
duplication list utilization

Imported Objects

From Fore-Common-MIB

EntryStatus

From Fore-Switch-MIB

AAL5CountingMode
shmem	OBJECT-IDENTITY

From SNMPv2-SMI

Counter32
Gauge32
Integer32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

DisplayString
RowStatus

How to Use in IPNetwork Monitor

Example using ibShmem5TxCells OID:

Select a Fore Systems (later Marconi) ForeRunner ATM switch network module (shared-memory resource utilization) 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 ibShmem5TxCells 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. It reports the number of cells transmitted. 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
shmem5Group	1.3.6.1.4.1.326.2.2.1.5.13			Shared memory network module.
netmodShmem5Table	1.3.6.1.4.1.326.2.2.1.5.13.1		not-accessible	A table for shared memory network module configurations.
netmodShmem5Entry	1.3.6.1.4.1.326.2.2.1.5.13.1.1		not-accessible	A table entry containing shared memory network module configuration information.
I32 nShmem5Index	1.3.6.1.4.1.326.2.2.1.5.13.1.1.1	Integer32	not-accessible	The index of this netmodShmem5Entry. The same index is also used as entity index for this entry within entPhysicalTable.
I32 nShmem5CellMemorySize	1.3.6.1.4.1.326.2.2.1.5.13.1.1.2	Integer32	read-only	Cell RAM size of this shmem in 32 bits.
I32 nShmem5TableMemorySize	1.3.6.1.4.1.326.2.2.1.5.13.1.1.3	Integer32	read-only	Table RAM size of this shmem in 32 bits.
I32 nShmem5SchedulerMemorySize	1.3.6.1.4.1.326.2.2.1.5.13.1.1.4	Integer32	read-only	Scheduler RAM size of this shmem in 32 bits.
I32 nShmem5SharedMemorySize	1.3.6.1.4.1.326.2.2.1.5.13.1.1.5	Integer32	read-only	Amount of shared memory of this shmem in cells.
G32 nShmem5DupListUsed	1.3.6.1.4.1.326.2.2.1.5.13.1.1.6	Gauge32	read-only	Current number of multicast duplication list entries used.
G32 nShmem5CurrMcastConns	1.3.6.1.4.1.326.2.2.1.5.13.1.1.7	Gauge32	read-only	Current number of multicast connections active on this shmem.
G32 nShmem5CurrUcastConns	1.3.6.1.4.1.326.2.2.1.5.13.1.1.8	Gauge32	read-only	Current number of unicast connections active on this shmem.
G32 nShmem5CellsBuffered	1.3.6.1.4.1.326.2.2.1.5.13.1.1.9	Gauge32	read-only	Current number of cells buffered at this shmem.
I32 nShmem5DuplicationListSize	1.3.6.1.4.1.326.2.2.1.5.13.1.1.11	Integer32	read-only	Number of multicast duplication list entries that can be supported on this shmem.
I32 nShmem5McastConns	1.3.6.1.4.1.326.2.2.1.5.13.1.1.12	Integer32	read-only	Number of multicast connection roots that can be supported on this shmem.
I32 nShmem5UcastConns	1.3.6.1.4.1.326.2.2.1.5.13.1.1.13	Integer32	read-write	Number of unicast connection that can be supported on this shmem.
I32 nShmem5ConfEfciOn	1.3.6.1.4.1.326.2.2.1.5.13.1.1.14	Integer32	read-write	The threshold on which the EFCI (Explicit Forward Congestion Indication) is enabled (in cells).
I32 nShmem5ConfEfciOff	1.3.6.1.4.1.326.2.2.1.5.13.1.1.15	Integer32	read-write	The threshold on which the EFCI (Explicit Forward Congestion Indication) is disabled (in cells).
AAL nShmem5AAL5CountingMode	1.3.6.1.4.1.326.2.2.1.5.13.1.1.16	AAL5CountingMode	read-write	AAL5 Counting mode on this shmem. The default option of AAL5CountingMode is not allowed. The default value is packet-counting mode.
INT nShmem5AAl5CountingModeOverride	1.3.6.1.4.1.326.2.2.1.5.13.1.1.17	INTEGER	read-write	Override option for AAL5 Counting mode. The default value is off.
INT nShmem5OverbookingHw	1.3.6.1.4.1.326.2.2.1.5.13.1.1.18	INTEGER	read-write	This is a switch to enable/disable the hardware overbooking feature on the griffin netmods. This is applicable only to the rtVBR and nrtVBR service categories.
bufferClassShmem5Table	1.3.6.1.4.1.326.2.2.1.5.13.2		not-accessible	A table for shared memory network module buffer class configuration. 8 buffer classes are provided
bufferClassShmem5Entry	1.3.6.1.4.1.326.2.2.1.5.13.2.1		not-accessible	A table entry containing Buffer classes.
I32 bcShmem5Index	1.3.6.1.4.1.326.2.2.1.5.13.2.1.1	Integer32	not-accessible	Index of this Shmem. Same value is also used to index the corresponding shmem entity within the entPhysicalTable.
I32 bcShmem5BufferClassIndex	1.3.6.1.4.1.326.2.2.1.5.13.2.1.2	Integer32	not-accessible	Index of this Buffer class.
ENT bcShmem5Status	1.3.6.1.4.1.326.2.2.1.5.13.2.1.3	EntryStatus	read-create	Status of this buffer class.
STR bcShmem5Name	1.3.6.1.4.1.326.2.2.1.5.13.2.1.4	DisplayString	read-create	Name of this buffer class.
I32 bcShmem5EpdThreshold	1.3.6.1.4.1.326.2.2.1.5.13.2.1.5	Integer32	read-create	Early Packet drop threshold for this buffer class in percentage of shared memory. Default value: 90% of shared space.
bufferClassAssignShmem5Table	1.3.6.1.4.1.326.2.2.1.5.13.3		not-accessible	A table for buffer class assignment.
bufferClassAssignShmem5Entry	1.3.6.1.4.1.326.2.2.1.5.13.3.1		not-accessible	A table entry containing Buffer class assigned to a service category and a subcategory
I32 bcaShmem5Index	1.3.6.1.4.1.326.2.2.1.5.13.3.1.1	Integer32	not-accessible	Index of this Shmem. Same value is also used to index the corresponding shmem entity within the entPhysicalTable.
I32 bcaShmem5ServCategory	1.3.6.1.4.1.326.2.2.1.5.13.3.1.2	Integer32	not-accessible	Index of this Service Category within serviceCategoryTable defined in Fore-Switch-MIB
I32 bcaShmem5ServSubCategory	1.3.6.1.4.1.326.2.2.1.5.13.3.1.3	Integer32	not-accessible	Subcategory within this Service Category create during upc creation.
ENT bcaShmem5Status	1.3.6.1.4.1.326.2.2.1.5.13.3.1.4	EntryStatus	read-create	Status of this Buffer allocation
I32 bcaShmem5BuffClass	1.3.6.1.4.1.326.2.2.1.5.13.3.1.5	Integer32	read-create	Buffer class index within this shmem.
ifBufferClassShmem5Table	1.3.6.1.4.1.326.2.2.1.5.13.4		not-accessible	A table for shared memory if/buffer class configuration.
ifBufferClassShmem5Entry	1.3.6.1.4.1.326.2.2.1.5.13.4.1		not-accessible	A table entry containing shared memory if/buffer class configuration.
I32 ibShmem5Index	1.3.6.1.4.1.326.2.2.1.5.13.4.1.1	Integer32	not-accessible	The index of this shmem5 entity. The same index is also used as the entity index for this entry within entPhysicalTable.
I32 ibShmem5If	1.3.6.1.4.1.326.2.2.1.5.13.4.1.2	Integer32	not-accessible	The index of this shmem if.
I32 ibShmem5Buffer	1.3.6.1.4.1.326.2.2.1.5.13.4.1.3	Integer32	not-accessible	The index of this buffer class.
I32 ibShmem5Qsize	1.3.6.1.4.1.326.2.2.1.5.13.4.1.4	Integer32	read-write	Dedicated queue size in cells.
I32 ibShmem5CLP01Thresh	1.3.6.1.4.1.326.2.2.1.5.13.4.1.5	Integer32	read-write	CLP01 cell discard threshold in cells.
I32 ibShmem5CLP1Thresh	1.3.6.1.4.1.326.2.2.1.5.13.4.1.6	Integer32	read-write	CLP1 cell discard threshold in cells.
C32 ibShmem5TxCellsEx	1.3.6.1.4.1.326.2.2.1.5.13.4.1.7	Counter32	read-only	Number of cells transmitted.
C32 ibShmem5CLP01Loss	1.3.6.1.4.1.326.2.2.1.5.13.4.1.8	Counter32	read-only	Number of cells lost due to CLP01 threshold.
C32 ibShmem5CLP1Loss	1.3.6.1.4.1.326.2.2.1.5.13.4.1.9	Counter32	read-only	Number of cells lost due to CLP1 threshold.
C32 ibShmem5EPDLoss	1.3.6.1.4.1.326.2.2.1.5.13.4.1.10	Counter32	read-only	Number of cells lost due to EPD events.
C32 ibShmem5PPDLoss	1.3.6.1.4.1.326.2.2.1.5.13.4.1.11	Counter32	read-only	Number of cells lost due to PPD events.
C32 ibShmem5OverflowLoss	1.3.6.1.4.1.326.2.2.1.5.13.4.1.12	Counter32	read-only	Number of cells lost due to memory overflows.
G32 ibShmem5CurrentQsize	1.3.6.1.4.1.326.2.2.1.5.13.4.1.13	Gauge32	read-only	Current queue size in cells.
G32 ibShmem5MaxQsize	1.3.6.1.4.1.326.2.2.1.5.13.4.1.14	Gauge32	read-only	Max queue size since last read.
STR ibShmem5IfName	1.3.6.1.4.1.326.2.2.1.5.13.4.1.15	DisplayString	read-only	Name of this shmem if.
netmodShmem5CustomBCSTable	1.3.6.1.4.1.326.2.2.1.5.13.5		not-accessible	A table for shared memory Custom BCS mappings
netmodShmem5CustomBCSEntry	1.3.6.1.4.1.326.2.2.1.5.13.5.1		not-accessible	A table entry containing shared memory Custom BCS mappings
I32 nShmem5CustomBCSIndex	1.3.6.1.4.1.326.2.2.1.5.13.5.1.1	Integer32	not-accessible	The index of this shared memory. The same index is also used as entity index for this entry within entPhysicalTable
I32 nShmem5CustomBCSValue	1.3.6.1.4.1.326.2.2.1.5.13.5.1.2	Integer32	not-accessible	The value of this BCS
I32 nShmem5CustomBCSWeight	1.3.6.1.4.1.326.2.2.1.5.13.5.1.3	Integer32	read-write	The weight assigned to this BCS
I32 nShmem5CustomBCSBuffer	1.3.6.1.4.1.326.2.2.1.5.13.5.1.4	Integer32	read-write	The buffer assigned to this BCS
ROW nShmem5CustomBCSRowStatus	1.3.6.1.4.1.326.2.2.1.5.13.5.1.5	RowStatus	read-write	Administrative status of this entry
netmodShmem5CustomBCSGroup	1.3.6.1.4.1.326.2.2.1.5.13.6
INT nShmem5CustomBCSState	1.3.6.1.4.1.326.2.2.1.5.13.6.1	INTEGER	read-write	Enable default BCS values on all netmods on this switch.

RFC description

A SNMP MIB module from Fore Systems, Inc. used for managing and capturing information from Fore Systems routers, switches, and networking devices. This MIB is part of Fore Systems' comprehensive management information base collection.

Start monitoring Fore Systems (later Marconi) ForeRunner ATM switch network module (shared-memory resource utilization) 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 Fore-Shmem5-MIB