MPOA-EXT-MIB

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Category: ATM, Products/Registration

Description: Provides proprietary extensions to ATM Forum MPOA protocol management objects.

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What Is MPOA-EXT-MIB?

MPOA-EXT-MIB is a proprietary MIB (using a "cn" object prefix suggestive of a legacy ATM/LAN networking vendor) that provides proprietary extensions to the ATM Forum's Multiprotocol over ATM (MPOA) standard MIB objects. It exposes configuration data for MPOA Client (MPC) resources, including shared VCC (virtual channel connection) control and data connections, flow-detection thresholds (minimum flow packet count), and IP address verification table settings. Its monitoring value centers on configuration and connection-resource status for MPOA clients — tracking VCC resource usage and IP-to-ATM address verification/caching behavior, which would reveal MPOA shortcut connections being under- or mis-provisioned. It is explicitly dependent on the ATM Forum's standard MPOA MIB, which it extends, since this module supplements rather than replaces the base MPOA object set. It would be deployed on legacy ATM-based LAN emulation/MPOA-capable routers and switches in networks using ATM shortcut routing between IP subnets, a largely legacy technology, and the MPOA-EXT-MIB reference remains relevant when auditing older ATM shortcut-routing deployments still in service.

IPNetwork Monitor allows you to monitor SNMP objects defined in MPOA-EXT-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

legacy ATM Forum MPOA-capable routers/switches

Monitoring Examples

An administrator would poll cnMpcConfigTable/cnMpcConfigEntry to check cnMpcShareControlVccs and cnMpcShareDataVccs, confirming how many shared VCCs an MPOA client is using for control versus data traffic, and would check cnMpcValidEntryCheckInterval and cnMpcMinFlowPacketCount to verify flow-detection thresholds for triggering MPOA shortcuts. Checking cnMpoaIpVerificationTable/cnMpoaIpVerificationEntry status would reveal whether IP-to-ATM address verification entries are being correctly downloaded and validated, which would explain failed MPOA shortcut connection setup if stale.

What Can Be Monitored

shared VCC control/data connection counts
MPOA flow-detection thresholds
IP address verification table status
MPOA client configuration state

Imported Objects

From CENTILLION-ROOT-MIB

Boolean
extensions	OBJECT-IDENTITY

From MPOA-MIB

mpcIndex

OBJECT-TYPE

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

IpAddress

From SNMPv2-TC-v1

RowStatus
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
cnMpoaExt	1.3.6.1.4.1.930.3.7
cnMpcConfigTable	1.3.6.1.4.1.930.3.7.2		not-accessible	The MPOA Bay Networks proprietary Client Configuration Table. This table contains configuration information for all MPOA Clients which this agent manages.
cnMpcConfigEntry	1.3.6.1.4.1.930.3.7.2.1		not-accessible	MPOA Client Bay Networks Configuration Entry. Each entry contains configuration information for one MPOA Client.
T/F cnMpcShareControlVccs	1.3.6.1.4.1.930.3.7.2.1.1	TruthValue	read-write	This Parameter enables VCC sharing for MPOA Control VCCs if set to true. LLC encapsulation is always signaled, regardless of sharing.
T/F cnMpcShareDataVccs	1.3.6.1.4.1.930.3.7.2.1.2	TruthValue	read-write	This parameter enables VCC sharing for MPOA Data VCCs if set to true. LLC encapsulation is always signaled, regardless of sharing.
INT cnMpcValidEntryCheckInterval	1.3.6.1.4.1.930.3.7.2.1.3	INTEGER	read-write	This parameter specifies the interval in seconds, to check LOCAL IP FDB entries in the Valid state for minimum activity.
INT cnMpcMinFlowPacketCount	1.3.6.1.4.1.930.3.7.2.1.4	INTEGER	read-write	This parameter specifies the minimum number of packets to be forwarded by a Local FDB Entry in the Valid state in cnMpcValidEntryCheckInterval to maintain minimum activity level. If minimum activity is not maintained, the entry is deleted.
cnMpoaIpVerification	1.3.6.1.4.1.930.3.7.3
INT cnMpoaIpVerificationTableType	1.3.6.1.4.1.930.3.7.3.1	INTEGER	read-write	This object controls the type of verification table that is being used. This object is used in combination with the status and download object and the IP verification table. Any change made to this object must be downloaded to the switch cards using the cnMpoaIpVerificationTableDownload object before the settings actually take effect. To enable a verification table, the table type must be set to exclusion or inclusion, enabled using the table status object and then downloaded to the cards using the download object. To delete the IP verification information, you must set the table status object to clear and then downloaded to the cards using the download object. When the information is deleted, the table type is read as unknown. To change the table type between exclusion and inclusion, you must first delete the IP verification information and then recreate it.
INT cnMpoaIpVerificationTableStatus	1.3.6.1.4.1.930.3.7.3.2	INTEGER	read-write	This object is used to enable, disable or clear the IP Verification information. Any change to this object information must be downloaded to the switch cards using the cnMpoaIpVerificationTableDownload object. An empty IP verification table will yield disable on a get.
BOO cnMpoaIpVerificationTableDownload	1.3.6.1.4.1.930.3.7.3.3	Boolean	read-write	Setting this object to true(1) causes the MPOA IP Verification Table information to be downloaded to all of the cards in the switch that support MPOA Clients (MPCs). You must download the IP Verification Table information to the cards before it will become effective when you are dynamically configuring this feature. The IP Verification Table is automatically downloaded to the MPC configured cards at card initialization. When read, this object always returns false(2).
cnMpoaIpVerificationTable	1.3.6.1.4.1.930.3.7.3.4		not-accessible	The MPC IP Verification Table is either an inclusion or exclusion list as indicated by the cnMpoaIpVerificationTableType object. Any change to this table must be downloaded to the switch cards using the cnMpoaIpVerificationTableDownload object.
cnMpoaIpVerificationEntry	1.3.6.1.4.1.930.3.7.3.4.1		not-accessible	Each row of the cnMpoaIpVerificationTable consists of an IP address and IP mask that is used to identify a range of addresses that are included or excluded when creating MPOA IP shortcuts. This cnMpoaIpVerificationStatus object is used to control adding or deleting each row.
IP cnMpoaIpVerificationAddress	1.3.6.1.4.1.930.3.7.3.4.1.1	IpAddress	read-only	This object is one of the two keys used to access the cnMpoaIpVerificationTable entries. This object contains an IP address used in conjunction with the cnMpoaIpVerificationMask to identify a range of one or more IP addresses.
IP cnMpoaIpVerificationMask	1.3.6.1.4.1.930.3.7.3.4.1.2	IpAddress	read-only	This object is one of the two keys used to access the cnMpoaIpVerificationTable entries. This object contains an IP mask used in conjunction with the cnMpoaIpVerificationAddress to identify a range of one or more IP addresses.
ROW cnMpoaIpVerificationStatus	1.3.6.1.4.1.930.3.7.3.4.1.3	RowStatus	read-write	Use this object to add or delete rows in the cnMpoaIpVerificationTable. To create new rows, use createAndGo(4) or createAndWait(5). To delete entries use destroy(6). A valid row will have the status of active(1) on a get.

RFC description

Bay Networks Centillion MPOA client configuration extensions with VCC sharing controls.

Start monitoring Legacy ATM Forum MPOA-capable router/switch (proprietary client extension) 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 MPOA-EXT-MIB

What Is MPOA-EXT-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description