CISCO-VOICE-ENABLED-LINK-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 1999-05-07

Category: Telephony and VoIP, Vendor: Cisco Devices

Description: Manages Cisco voice-enabled WAN links, tracking voice call capacity and usage on data interfaces.

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What Is CISCO-VOICE-ENABLED-LINK-MIB?

CISCO-VOICE-ENABLED-LINK-MIB manages Cisco's proprietary Voice Enabled ATM and Frame Relay link feature, which allows Cisco Switched Voice Protocol to discover voice network topology over data links by exchanging node MAC addresses in call setup and keepalive messages. It exposes a table of voice-enabled links per interface, including link type, the VPI/DLCI or VCI identifying the underlying ATM/FR circuit, and the remote node's MAC address learned via keepalives. Its monitoring value is primarily topology and link-health verification: confirming a link's remote MAC address is being learned/updated (evidence the keepalive protocol is functioning) helps detect a down or misconfigured voice trunk before calls fail to route. It depends on the underlying ATM/Frame Relay interface and Cisco Switched Voice Protocol topology-discovery mechanism. It is deployed on legacy Cisco voice gateways/switches using ATM or Frame Relay links to carry inter-node voice signaling, and the CISCO-VOICE-ENABLED-LINK-MIB MIB Browser view lets administrators inspect these voice-enabled link objects directly.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-VOICE-ENABLED-LINK-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 voice gateways/switches using ATM or Frame Relay links (Cisco Switched Voice Protocol)

Monitoring Examples

cvEnabledLinkTable/cvEnabledLinkEntry exposes cvEnabledLinkType, cvEnabledLinkVpiDlci, cvEnabledLinkVci, and cvEnabledLinkRemoteMacAddr for each voice-enabled circuit. An admin can confirm cvEnabledLinkRemoteMacAddr is populated and matches the expected remote node, and a link that fails to learn a remote MAC (staying blank or stale) signals a broken keepalive/topology-discovery exchange, indicating the voice trunk over that ATM/FR PVC is down.

What Can Be Monitored

voice-enabled link type
VPI/DLCI or VCI circuit identifiers
remote node MAC address (topology discovery)
default MAC address of local node
link keepalive/topology health

Imported Objects

From CISCO-SMI

ciscoExperiment

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

DisplayString
MacAddress

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoVoiceEnabledLinkMIB	1.3.6.1.4.1.9.10.53			This MIB module provides information about Voice Enabled ATM and Frame Relay Links used by the Cisco Switched voice protocol. The Cisco Switched voice protocol passes the default MAC address for its node to the next node in the path, in both call setup messages and keepalive requests and responses. This MAC address is stored at the remote node to identify where the incoming pvc originates. This information is then used by the Cisco Voice Manager Application to determine the voice network topology.
cvenabledlinkMIBObjects	1.3.6.1.4.1.9.10.53.1
cvEnabledLink	1.3.6.1.4.1.9.10.53.1.1
MAC cvEnabledDefaultMacAddr	1.3.6.1.4.1.9.10.53.1.1.1	MacAddress	read-only	This item defines the Default MAC Address used by this node in call set up messages, keepalive requests and responses.
cvEnabledLinkTable	1.3.6.1.4.1.9.10.53.1.1.2		not-accessible	This table contains information about ATM and Frame Relay Links used by voice over ATM and voice over Frame Relay calls.
cvEnabledLinkEntry	1.3.6.1.4.1.9.10.53.1.1.2.1		not-accessible	The information regarding a single ATM or Frame Relay Link. An entry of this table is created when its associated pvc is enabled for carrying Cisco Switched voice traffic. The entry is deleted when its associated pvc is no longer enabled for Cisco Switched voice traffic.
INT cvEnabledLinkIndex	1.3.6.1.4.1.9.10.53.1.1.2.1.1	INTEGER	read-only	A monotonically increasing number, starting from zero, that is assigned to each link that is currently configured to carry Cisco Switched voice traffic. If a link is later unconfigured for voice traffic, the number assigned to it will not be reused. When the maximum value is reached, the value will wrap to zero and use a currently unassigned value.
INT cvEnabledLinkType	1.3.6.1.4.1.9.10.53.1.1.2.1.2	INTEGER	read-only	The object defines the type of link, either ATM or Frame Relay.
STR cvEnabledLinkInterfaceName	1.3.6.1.4.1.9.10.53.1.1.2.1.3	DisplayString	read-only	The object specifies the iFName of the peer interface that is used for the voice over ATM/FR call. A zero length string indicates that the value is unavailable.
INT cvEnabledLinkVpiDlci	1.3.6.1.4.1.9.10.53.1.1.2.1.4	INTEGER	read-only	The VPI or DLCI used for this ATM/Frame Relay connection.
INT cvEnabledLinkVci	1.3.6.1.4.1.9.10.53.1.1.2.1.5	INTEGER	read-only	The VCI used, if it is an ATM connection.
MAC cvEnabledLinkRemoteMacAddr	1.3.6.1.4.1.9.10.53.1.1.2.1.6	MacAddress	read-only	The default MAC address of the node at the other end of the link.
ciscoVoiceEnabledLinkMIBNotificationPrefix	1.3.6.1.4.1.9.10.53.2
ciscoVoiceEnabledLinkMIBNotifications	1.3.6.1.4.1.9.10.53.2.0
ciscoVoiceEnabledlinkMIBConformance	1.3.6.1.4.1.9.10.53.3
ciscoVoiceEnabledlinkMIBCompliances	1.3.6.1.4.1.9.10.53.3.1
ciscoVoiceEnabledlinkMIBCompliance	1.3.6.1.4.1.9.10.53.3.1.1			The compliance statement for entities which implement the CISCO VOICE ENABLED LINK MIB
ciscoVoiceEnabledlinkMIBGroups	1.3.6.1.4.1.9.10.53.3.2
cvEnabledMacAddrGroup	1.3.6.1.4.1.9.10.53.3.2.1			A collection of objects providing the Default Mac Address capability.
cvEnabledLinkGroup	1.3.6.1.4.1.9.10.53.3.2.2			A collection of objects providing the Voice Enabled Link entry capability.

RFC description

Tracks voice call topology by storing peer MAC addresses on Cisco voice ATM/Frame Relay links.

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Download CISCO-VOICE-ENABLED-LINK-MIB

What Is CISCO-VOICE-ENABLED-LINK-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description