RBN-MEMORY-MIB

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Organization: Redback Networks, Inc.

Last Updated: 2004-03-05

Category: System Management, Vendor: Ericsson

Description: Monitors memory utilization and allocation statistics per card on Redback SmartEdge BRAS platforms.

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What Is RBN-MEMORY-MIB?

RBN-MEMORY-MIB is a Redback/Ericsson SmartEdge enterprise MIB dedicated to monitoring system memory usage across the cards/modules in a chassis-based BRAS. It exposes per-module memory statistics through two related tables, one at the SMS (system management/software) level and one at a general module level, each tracking free bytes, bytes in use, memory blocks in use, and cumulative block allocations. This is squarely a hardware/software health MIB: it lets an operator watch for memory exhaustion or fragmentation on individual line cards or control modules, a common precursor to card instability, process crashes, or degraded packet forwarding performance on a heavily loaded BRAS. It is a standalone Redback enterprise MIB, though it is typically correlated with module/slot identifiers defined elsewhere in the Redback enterprise MIB tree (e.g. chassis/card MIBs) to map memory readings to physical hardware. It is deployed on Redback/Ericsson SmartEdge routers where per-card memory pressure needs continuous tracking to catch leaks or exhaustion before they cause service outages. Engineers can download the RBN-MEMORY-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in RBN-MEMORY-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

Redback/Ericsson SmartEdge BRAS chassis
SmartEdge line/control cards

Monitoring Examples

An administrator polls rbnSmsMemoryTable/rbnSmsMemoryEntry, indexed by rbnSmsMemoryIndex and rbnSmsMemoryModule, tracking rbnSmsMemoryFreeBytes and rbnSmsMemoryBytesInUse over time to detect a steady decline in free memory suggesting a leak on a particular module; a parallel check of rbnMemoryTable/rbnMemoryEntry via rbnMemoryModule gives a general per-module view for comparison. A sudden drop in rbnSmsMemoryFreeBytes combined with rising rbnSmsMemoryBlocksInUse on one card, while others remain stable, points to a memory leak isolated to that specific module needing a reload or software fix.

What Can Be Monitored

free memory per module
memory bytes in use per module
memory blocks in use
cumulative memory block allocation

Imported Objects

From RBN-SMI

rbnMgmt

OBJECT-IDENTITY

From RBN-TC

RbnKBytes

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

OIDs

OID symbolic	OID numeric	Type	Access	Description
rbnMemoryMib	1.3.6.1.4.1.2352.2.16			Defines the objects necessary to obtain information allowing monitoring of system memory usage in a Redback device.
rbnMemoryMIBNotifications	1.3.6.1.4.1.2352.2.16.0
rbnMemoryMIBObjects	1.3.6.1.4.1.2352.2.16.1
rbnSmsMemoryTable	1.3.6.1.4.1.2352.2.16.1.1		not-accessible	This table contains the objects which identify information about SMS memory usage. This table has been obsoleted. The new rbnMemoryTable must be used instead.
rbnSmsMemoryEntry	1.3.6.1.4.1.2352.2.16.1.1.1		not-accessible	A conceptual row in the rbnSmsMemoryTable. This Entry has been obsoleted. The new rbnMemoryEntry must be used instead.
U32 rbnSmsMemoryIndex	1.3.6.1.4.1.2352.2.16.1.1.1.1	Unsigned32	not-accessible	A unique identifier for an entry in this table.
STR rbnSmsMemoryModule	1.3.6.1.4.1.2352.2.16.1.1.1.2	SnmpAdminString	read-only	The name of the module. This name is the same as that which would be displayed via the `show memory' CLI command. Examples would be CE, FE, SM 2, CM 3.
U32 rbnSmsMemoryFreeBytes	1.3.6.1.4.1.2352.2.16.1.1.1.3	Unsigned32	read-only	The number of unused bytes of memory in this entry.
U32 rbnSmsMemoryBytesInUse	1.3.6.1.4.1.2352.2.16.1.1.1.4	Unsigned32	read-only	The number of bytes of memory in use in this entry.
U32 rbnSmsMemoryBlocksInUse	1.3.6.1.4.1.2352.2.16.1.1.1.5	Unsigned32	read-only	The number of blocks of memory in use in this entry. A block of memory is the amount of memory returned by a single call to the memory allocation routine in AOS. Hence the size of a block of memory is variable. This statistic can be used to check for memory leaks. One possible strategy is to note the value, do some operations, undo the operations, then check the value again - the start and end values should match. If they do not, there may be a memory leak.
U32 rbnSmsMemoryCumulBlocks	1.3.6.1.4.1.2352.2.16.1.1.1.6	Unsigned32	read-only	The cumulative blocks count for this entry. It is an indication of how many times the memory allocation in AOS has been called since the system booted. It can be used to measure the expense of an operation in terms of calls to allocate memory, which are fairly expensive in terms of CPU time.
rbnMemoryTable	1.3.6.1.4.1.2352.2.16.1.2		not-accessible	This table contains the objects which identify information about memory usage.
rbnMemoryEntry	1.3.6.1.4.1.2352.2.16.1.2.1		not-accessible	A conceptual row in the rbnMemoryTable.
U32 rbnMemoryIndex	1.3.6.1.4.1.2352.2.16.1.2.1.1	Unsigned32	not-accessible	A unique identifier for an entry in this table.
STR rbnMemoryModule	1.3.6.1.4.1.2352.2.16.1.2.1.2	SnmpAdminString	read-only	The name of the module on which this memory resides.
RBN rbnMemoryFreeKBytes	1.3.6.1.4.1.2352.2.16.1.2.1.3	RbnKBytes	read-only	The size of unused memory in this entry.
RBN rbnMemoryKBytesInUse	1.3.6.1.4.1.2352.2.16.1.2.1.4	RbnKBytes	read-only	The size of memory in use in this entry.
U32 rbnMemoryBlocksInUse	1.3.6.1.4.1.2352.2.16.1.2.1.5	Unsigned32	read-only	The number of blocks of memory on this module which is in use. A block of memory is a unit of physical/virtual memory that can be allocated or freed by the user. This statistic can be used to check for memory leaks. One possible strategy is to note the value, do some operations, undo the operations, then check the value again - the start and end values should match. If they do not, there may be a memory leak.
U32 rbnMemoryCumulBlocks	1.3.6.1.4.1.2352.2.16.1.2.1.6	Unsigned32	read-only	The cumulative blocks count for this entry. For example, in some systems, this indicates how many times the memory allocation routine has been called since the system booted. Then, this can be used to measure the expense of an operation because the calls to allocate memory are often considered to be cpu-intensive.
rbnMemoryMIBConformance	1.3.6.1.4.1.2352.2.16.2
rbnSmsMemoryCompliances	1.3.6.1.4.1.2352.2.16.2.1
rbnSmsMemoryCompliance	1.3.6.1.4.1.2352.2.16.2.1.1			The compliance statement for SNMP entities which implement the Redback SMS memory usage MIB.
rbnSmsMemoryGroups	1.3.6.1.4.1.2352.2.16.2.2
rbnSmsMemoryGroup	1.3.6.1.4.1.2352.2.16.2.2.1			The collection of objects providing SMS memory usage information.
rbnMemoryCompliances	1.3.6.1.4.1.2352.2.16.2.3
rbnMemoryCompliance	1.3.6.1.4.1.2352.2.16.2.3.1			The requirements for conformance to the Redback Memory Usage MIB.
rbnMemoryGroups	1.3.6.1.4.1.2352.2.16.2.4
rbnMemoryGroup	1.3.6.1.4.1.2352.2.16.2.4.1			The collection of objects providing memory usage information.

RFC description

Redline Networks (RBN) vendor-private MIB for memory utilization and allocation monitoring.

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Download RBN-MEMORY-MIB

What Is RBN-MEMORY-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description