CISCO-ATM-DUAL-PHY-MIB

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Category: ATM

Description: Manages dual PHY redundancy configuration for ATM physical interfaces on Cisco devices.

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What Is CISCO-ATM-DUAL-PHY-MIB?

This is a Cisco enterprise MIB for managing dual-PHY redundant ATM physical interfaces, used on Cisco routers/switches that support redundant physical-layer ATM transport (e.g. SONET/SDH-based ATM line cards). It exposes a statistics table per physical interface covering line/section/path error counters (BIP-8, FEB errors), signal-loss and far-end-receive-failure indicators, HCS error counts, and which PHY is currently active. Its core purpose is hardware health monitoring: it lets an operator detect physical-layer degradation via rising bit-error counters, loss-of-signal conditions, and confirm which of the redundant PHYs is actively carrying traffic, essential for a functioning failover setup. As an ATM PHY extension, it complements the standard ATM-MIB and Cisco's broader interface MIBs rather than replacing them. It is typically deployed on Cisco ATM edge/aggregation platforms with SONET/SDH-protected dual PHY line cards in carrier or enterprise WAN environments. Engineers can download the CISCO-ATM-DUAL-PHY-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-ATM-DUAL-PHY-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 router/switch with redundant ATM PHY line cards

Monitoring Examples

An engineer would poll cadpStatTable/cadpStatEntry for a given interface and watch cadpStatSectionBIP8Errors, cadpStatLineBIP824Errors, and cadpStatPathBIP8Errors for rising error counts indicative of physical-layer degradation. cadpStatLossOfSignal and cadpStatFarEndReceiveFailure flag hard failures, while cadpStatActive shows which of the two redundant PHYs is currently in service. A jump in cadpStatUncorrectableHCSErrors alongside a PHY switchover in cadpStatActive would indicate the standby PHY had to take over due to line degradation.

What Can Be Monitored

active PHY selection
loss of signal
far-end receive failure
section/line/path BIP-8 error counts
correctable/uncorrectable HCS errors

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From CISCO-TC

InterfaceIndexOrZero

From IF-MIB

InterfaceIndex
ifIndex	OBJECT-TYPE

From RFC-1212

OBJECT-TYPE

From RFC-1215

TRAP-TYPE

From SNMPv2-SMI-v1

Counter32

From SNMPv2-TC-v1

TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoAtmDualPhyMIB	1.3.6.1.4.1.9.9.60
ciscoAtmDualPhyMIBObjects	1.3.6.1.4.1.9.9.60.1
cadpStatistics	1.3.6.1.4.1.9.9.60.1.1
cadpStatTable	1.3.6.1.4.1.9.9.60.1.1.1		not-accessible	A table of status information about ATM phy.
cadpStatEntry	1.3.6.1.4.1.9.9.60.1.1.1.1		not-accessible	An Atm Phy table entry, containing information about a phy on this ATM module.
T/F cadpStatLossOfSignal	1.3.6.1.4.1.9.9.60.1.1.1.1.1	TruthValue	read-only	Set to true if the phy is currently experiencing a loss of signal (LOS) from its connected port. Set to false if the phy is not experiencing a loss of signal.
T/F cadpStatFarEndReceiveFailure	1.3.6.1.4.1.9.9.60.1.1.1.1.2	TruthValue	read-only	Set to true if the phy is currently experiencing a far end receive failure (FERF) with its connected port. Set to false if the phy is not experiencing a far end receive failure.
T/F cadpStatActive	1.3.6.1.4.1.9.9.60.1.1.1.1.5	TruthValue	read-only	Set to true when this phy is currently the active phy. Set to false when this phy is not the currently active phy.
C32 cadpStatSectionBIP8Errors	1.3.6.1.4.1.9.9.60.1.1.1.1.6	Counter32	read-only	The Bit Interleaved Parity 8 is an error checking code applied for quick isolation of faults. Each bit in the B octets is set to 1 or 0 as necessary to obtain even parity over the previous frame. The calculated BIP-8 code for frame N is compared with the BIP-8 code extracted from the B1 byte of frame N+1. Differences indicate that a section level bit error has occurred. Count of Section BIP-8 (Bit Interleaved Parity) errors that have been detected on this phy.
C32 cadpStatLineBIP824Errors	1.3.6.1.4.1.9.9.60.1.1.1.1.7	Counter32	read-only	The Bit Interleaved Parity 8/24 is an error checking code based on even parity. The calculated BIP code for frame N is compared with the BIP-8/24 code extracted from the B2 byte(s) of frame N+1. Any differences indicate that a line layer bit error has occurred. Count of line bit interleaved partiy (BIP-8/24) errors on this phy.
C32 cadpStatLineFEBErrors	1.3.6.1.4.1.9.9.60.1.1.1.1.8	Counter32	read-only	The number of bits (binary 000 to 1000) in the previous BIP-8 that didn't match the even parity check are inserted by the transmitter. The receiver checks for this in the M0/M1 byte of the frame. A non-zero value (legal range is binary 0000 - 1000) indicates a line layer error in the remote end. Any other value is treated as no error. Count of Line Far End Bit Errors (FEBE) on this phy.
C32 cadpStatPathBIP8Errors	1.3.6.1.4.1.9.9.60.1.1.1.1.9	Counter32	read-only	The Bit Interleaved Parity 8 is an error checking code applied for quick isolation of faults. Each bit in the B octets is set to 1 or 0 as necessary to obtain even parity over the previous frame. The calculated BIP-8 code for frame N is compared with the BIP-8 code extracted from the B3 byte of frame N+1. Differences indicate that a Path level bit error has occurred. Count of Path BIP-8 (Bit Interleaved Parity) errors that have been detected on this phy.
C32 cadpStatPathFEBErrors	1.3.6.1.4.1.9.9.60.1.1.1.1.10	Counter32	read-only	The number of B3 errors in the previous frame inserted by the transmitter. The receiver checks for this in the G1 byte of the frame. A non-zero value (legal range is binary 0000 - 1000) indicates a line layer error in the remote end. Any other value is treated as no error. Count of Path Far End Bit Errors (FEBE) on this phy.
C32 cadpStatCorrectableHCSErrors	1.3.6.1.4.1.9.9.60.1.1.1.1.11	Counter32	read-only	The Header Checksum (HCS) is a CRC-8 calculation over the first 4 octets of the ATM cell header. The received HCS is verified using the polynomial x^8 + x^2 + x + 1. The coset polynomial x^6 + x^4 + x^2 + 1, is added (modulo 2) to the received HCS octet before comparison with the calculated result. Cells with single bit error in the HCS byte are corrected. Cells with more than one bit error in the HCS byte are uncorrectable. Count of incoming cells on this phy with single bit error in the Header Checksum (HCS) byte
C32 cadpStatUncorrectableHCSErrors	1.3.6.1.4.1.9.9.60.1.1.1.1.12	Counter32	read-only	The Header Checksum (HCS) is a CRC-8 calculation over the first 4 octets of the ATM cell header. The received HCS is verified using the polynomial x^8 + x^2 + x + 1. The coset polynomial x^6 + x^4 + x^2 + 1, is added (modulo 2) to the received HCS octet before comparison with the calculated result. Cells with single bit error in the HCS byte are corrected. Cells with more than one bit error in the HCS byte are uncorrectable. Count of uncorrectable Header Checksum (HCS) errors on this phy.
NUM cadpStatOperActivePhy	1.3.6.1.4.1.9.9.60.1.1.2	InterfaceIndexOrZero	read-only	Returns the ifIndex of the phy which is currently the active phy. A value of 0 indicates that no phy is currently active.
NUM cadpStatAdminActivePhy	1.3.6.1.4.1.9.9.60.1.1.3	InterfaceIndex	read-write	Returns the ifIndex of the phy which is the preferred active phy. A value of 0 indicates that no phy is currently active. Setting this object to a value different from its current value causes the ATM module to make the indicated phy active, and the active phy inactive. Setting this object to its current value has no effect. After performing the phy change, the agent will update all phy information (including cadpStatOperActivePhy) and send a ciscoAtmDualPhyChange trap.
ciscoAtmDualPhyMIBTrapPrefix	1.3.6.1.4.1.9.9.60.2
ciscoAtmDualPhyMIBTraps	1.3.6.1.4.1.9.9.60.2.0
NTF ciscoAtmDualPhyChange	1.3.6.1.4.1.9.9.60.2.0.1			A ciscoAtmDualPhyChange trap is sent when the active phy changes either because of a failure or because of user intervention (setting cadpStatAdminActivePhy, for example).
ciscoAtmDualPhyMIBConformance	1.3.6.1.4.1.9.9.60.3
ciscoAtmDualPhyMIBCompliances	1.3.6.1.4.1.9.9.60.3.1
ciscoAtmDualPhyMIBCompliance	1.3.6.1.4.1.9.9.60.3.1.1
ciscoAtmDualPhyMIBGroups	1.3.6.1.4.1.9.9.60.3.2
ciscoAtmDualPhyMIBGroup	1.3.6.1.4.1.9.9.60.3.2.1

RFC description

Cisco Systems MIB for ATM dual-PHY (physical layer) interface management, supporting concurrent multi-PHY configurations on Cisco ATM network devices.

Start monitoring Cisco router/switch with redundant ATM PHY line cards 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 CISCO-ATM-DUAL-PHY-MIB

What Is CISCO-ATM-DUAL-PHY-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description