CISCO-GSLB-HEALTH-MON-MIB

All MIBs › CISCO-GSLB-HEALTH-MON-MIB

Organization: Cisco Systems, Inc.

Last Updated: 2007-04-09

Category: Cisco Devices, Web and Application Servers

Description: Provides management objects for configuring and monitoring health probes for backend servers in Cisco global server load balancing deployments.

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What Is CISCO-GSLB-HEALTH-MON-MIB?

CISCO-GSLB-HEALTH-MON-MIB is a Cisco-specific SNMP module for Global Server Load Balancing (GSLB) devices, defining objects for configuring and monitoring keepalive health probes that periodically check whether a backend server resource associated with a DNS answer is still active. It exposes objects for probe configuration (query domain names, HTTP/TCP probe methods and termination behavior, decay parameters) as well as statistics such as the total number of configured probes and dropped keepalive notifications, plus related trap-rate-limiting controls. Its monitoring focus is squarely on the health/availability status of backend application servers behind a GSLB deployment: administrators use it to confirm keepalive probes are actively reaching servers, to see how many probes are configured versus expected, and to catch dropped notifications that could mean the GSLB device's monitoring subsystem is overloaded or misbehaving. It builds on general DNS/GSLB concepts and works alongside Cisco's broader server load-balancing MIB family rather than any single external IETF standard. It is typically deployed on Cisco devices performing global server load balancing across geographically distributed data centers to steer client DNS resolution toward healthy sites. Engineers can download the CISCO-GSLB-HEALTH-MON-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-GSLB-HEALTH-MON-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 Global Server Load Balancing (GSLB) devices

Monitoring Examples

An administrator would poll cghMonKalParameterTable to review cghMonKalParameterMethod for each keepalive, confirming whether a given probe uses cghMonHttpHeadPath (an HTTP HEAD-based check) or a TCP connection check, and check cghMonHttpHeadConnTermMethod/cghMonTcpConnTermMethod to see how the probe closes its connection after checking. Monitoring cghMonTotalConfiguredProbes against an expected baseline would reveal if probes were accidentally removed, while a rising cghMonDroppedKalNotifs count would indicate the GSLB device is dropping keepalive result notifications, possibly due to cghMonKalTrapRateLimit being hit under high probe volume. The cghMonNsQueryDomainName object ties a given probe back to the DNS domain name being load-balanced, useful when diagnosing why a specific hostname is returning an unhealthy server.

What Can Be Monitored

keepalive probe configuration and method (HTTP/TCP)
total configured probes
dropped keepalive notifications
trap rate limiting for keepalive events
DNS query domain name tied to probes

Imported Objects

From CISCO-GSLB-DNS-MIB

cgdAnswerId

OBJECT-TYPE

From CISCO-GSLB-TC-MIB

CiscoGslbKalapType
CiscoGslbKeepaliveMethod
CiscoGslbKeepaliveRate
CiscoGslbKeepaliveStatus
CiscoGslbKeepaliveTargetType
CiscoGslbTerminationMethod

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From INET-ADDRESS-MIB

InetAddress
InetAddressType
InetPortNumber

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-MIB

sysName

OBJECT-TYPE

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

RowStatus
StorageType
TruthValue

How to Use in IPNetwork Monitor

Example using cghMonKalSentProbes OID:

Select a Cisco Global Site Selector (GSS) / GSLB device 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 cghMonKalSentProbes 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. This object specifies the total number of keepalive probes sent to the remote device, identified by cgdAnswerAddress. 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 (in probes), 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
STR cghMonCappHash	1.3.6.1.4.1.9.9.600.1.3.2	SnmpAdminString	read-write	This object specifies the default alphanumeric value used to encrypt CAPP data. A keepalive with cghMonKalMethod as 'kalap' uses CAPP for inter-communication between GSLB devices.
U32 cghMonCraDecay	1.3.6.1.4.1.9.9.600.1.3.6	Unsigned32	read-write	This object is used for a keepalive with cghMonKalMethod as 'cra', to specify how heavily GSLB should weigh recent DNS Round Trip Time (RTT) probe results relative to earlier RTT metrics, with 1 indicating that recent results should not be weighed any more than previous RTT results.
U32 cghMonDroppedKalNotifs	1.3.6.1.4.1.9.9.600.1.3.8	Unsigned32	read-only	The value of this object is the total number of ciscoGslbKalEventStatus notifications dropped since the network management portion of the system was last re-initialized. These notifications are dropped when the limit configured in cghMonKalTrapRateLimit is reached.
CIS cghMonHttpHeadConnTermMethod	1.3.6.1.4.1.9.9.600.1.3.4	CiscoGslbTerminationMethod	read-write	This object specifies the default connection termination method for a keepalive with cghMonKalMethod as 'httphead'.
STR cghMonHttpHeadPath	1.3.6.1.4.1.9.9.600.1.3.3	SnmpAdminString	read-write	This object specifies the default path relative to the server website, for a keepalive with cghMonKalMethod as 'httphead'.
cghMonKal	1.3.6.1.4.1.9.9.600.1.4
U32 cghMonKalAnswerId	1.3.6.1.4.1.9.9.600.1.4.1.1.4	Unsigned32	read-create	This object is used to associate an answer with this keepalive instance. Its value must be same as the value configured in cgdAnswerTable. This object is mandatory for a row creation, the only expection being when cghMonKalTargetType has a value 'shared'.
STR cghMonKalCappHash	1.3.6.1.4.1.9.9.600.1.4.1.1.13	SnmpAdminString	read-create	This object specifies the alphanumeric value used to encrypt interbox communications, which uses CAPP. The same value needs to be the configured on the remote GSLB device, identified by cgdAnswerAddress . This object is valid when cghMonKalMethod is 'kalap' provided cghMonKalCappSecure is 'true'. The default for this object is the value of cghMonCappHash.
T/F cghMonKalCappSecure	1.3.6.1.4.1.9.9.600.1.4.1.1.12	TruthValue	read-create	This object specifies whether or not the keepalive uses CAPP encryption. This object is valid when cghMonKalMethod is 'kalap'.
cghMonKalConfigEntry	1.3.6.1.4.1.9.9.600.1.4.1.1		not-accessible	An entry containing configuration entities for a keepalive instance. Entries can be added/deleted/modified by administrator action. The following objects are mandatory for a row creation: cghMonKalMethod cghMonKalTargetType.
cghMonKalConfigTable	1.3.6.1.4.1.9.9.600.1.4.1		not-accessible	This table is used for configuring keepalives. It consists a list of configuration entries for each keepalive configured.
U32 cghMonKalDelay	1.3.6.1.4.1.9.9.600.1.4.1.1.8	Unsigned32	read-create	This object specifies one-way delay time in milliseconds. This value is used by the GSLB device to calculate a static round-trip time (RTT), with the one-way delay constituting one-half of the round-trip time. This object is valid when cghMonKalMethod is 'cra' provided cghMonKalEnable is 'false'.
INE cghMonKalDestPort	1.3.6.1.4.1.9.9.600.1.4.1.1.11	InetPortNumber	read-create	This object specifies the port on the remote device that is to receive the TCP/HTTPHEAD keepalive probe from the GSLB device. The default value for this object is got from cghMonKalParameterDestPort in the default properties table (cghMonKalParameterTable).
U32 cghMonKalDynamicLoad	1.3.6.1.4.1.9.9.600.1.4.3.1.7	Unsigned32	read-only	This object speifies the dynamic load value on the remote device, identified by cgdAnswerAddress object, associated with this keepalive.
T/F cghMonKalEnable	1.3.6.1.4.1.9.9.600.1.4.1.1.7	TruthValue	read-create	This object is used to activate/deactivate a keepalive by setting the state to either 'true'/'false' respectively.
U32 cghMonKalFastRetries	1.3.6.1.4.1.9.9.600.1.4.1.1.19	Unsigned32	read-create	This object specifies the number of times the GSLB device retransmits a keepalive probe before declaring the target, identified by cgdAnswerAddress, offline. The value of this object is by default got from the default properties table (cghMonKalParameterTable), from the row identified by cghMonKalMethod.
U32 cghMonKalFastSuccessfulProbes	1.3.6.1.4.1.9.9.600.1.4.1.1.20	Unsigned32	read-create	This object specifies the number of consecutive successful keepalive attempts that must be recognized by the GSLB device before bringing an answer back online. The value of this object is by default got from the default properties table (cghMonKalParameterTable), from the row identified by cghMonKalMethod.
cghMonKalGeneralConfig	1.3.6.1.4.1.9.9.600.1.3
STR cghMonKalHostTag	1.3.6.1.4.1.9.9.600.1.4.1.1.16	SnmpAdminString	read-create	This object specifies an optional domain name that is sent to the VIP as part of the HTTPHEAD query. This tag allows an SLB to resolve the keepalive request to a particular website even when multiple sites are represented by the same VIP. This is object is valid when cghMonKalMethod is 'httphead'.
U32 cghMonKalId	1.3.6.1.4.1.9.9.600.1.4.1.1.1	Unsigned32	not-accessible	This object uniquely identifies a keepalive.
CIS cghMonKalKalapType	1.3.6.1.4.1.9.9.600.1.4.1.1.9	CiscoGslbKalapType	read-create	This object specifies the type of kalap for a keepalive. This object is valid when cghMonKalTargetType is 'kalap'.
CIS cghMonKalMethod	1.3.6.1.4.1.9.9.600.1.4.1.1.3	CiscoGslbKeepaliveMethod	read-create	This object specifies the keepalive method.
C32 cghMonKalNegativeProbes	1.3.6.1.4.1.9.9.600.1.4.3.1.5	Counter32	read-only	This object specifies the total number of keepalive probes sent to the remote device, identified by cgdAnswerAddress object, that resulted in a negative response.
T/F cghMonKalNotifEnable	1.3.6.1.4.1.9.9.600.1.1.1	TruthValue	read-write	This object defines the administrative state of sending notifications to signal the transition of the status of keepalives.
INE cghMonKalParameterDestPort	1.3.6.1.4.1.9.9.600.1.3.10.1.7	InetPortNumber	read-create	This object specifies the port on the remote device, identified by cgdAnswerAddress, to which the keepalive is sent. This object is valid when cghMonKalParameterMethod is 'tcp' or 'httphead'.
cghMonKalParameterEntry	1.3.6.1.4.1.9.9.600.1.3.10.1		not-accessible	An entry in cghMonKalParameterTable. Each entry contains default values for a keepalive probe method, identified by cghMonKalParameterMethod. Entries can be added/modified/deleted by administrator action. If the value of cghMonKalParameterStorageType is 'permanent' then the corresponding entry cannot be deleted.
U32 cghMonKalParameterFastRetries	1.3.6.1.4.1.9.9.600.1.3.10.1.5	Unsigned32	read-create	This object specifies the number of times that the GSLB device retransmits a packet before declaring an answer offline. This object is valid when cghMonKalParameterRate is 'fast'.
U32 cghMonKalParameterFastSuccessfulProbes	1.3.6.1.4.1.9.9.600.1.3.10.1.6	Unsigned32	read-create	This object specifies the number of consecutive successful keepalive attempts (probes) that must be recognized by the GSLB device before bringing an answer back online (and reintroducing it into the GSLB network). This object is valid when cghMonKalParameterRate is 'fast'.
CIS cghMonKalParameterMethod	1.3.6.1.4.1.9.9.600.1.3.10.1.1	CiscoGslbKeepaliveMethod	not-accessible	This object specifies the method used for the keepalive.
U32 cghMonKalParameterMinimumFrequency	1.3.6.1.4.1.9.9.600.1.3.10.1.3	Unsigned32	read-create	This object specifies the minimum interval with which the GSLB device attempts to schedule keepalives. It is valid when cghMonKalParameterMethod is 'cra' or 'ns'. And also, it is valid when cghMonKalParameterMethod is 'tcp', 'icmp', 'httphead' or 'kalap', provided cghMonKalParameterRate is 'standard'.
CIS cghMonKalParameterRate	1.3.6.1.4.1.9.9.600.1.3.10.1.2	CiscoGslbKeepaliveRate	read-create	This object specifies the global rate setting for a keepalive method, identified by cghMonKalParameterMethod. It is not valid when cghMonKalParameterMethod is 'ns' or 'cra'.
U32 cghMonKalParameterResponseTimeout	1.3.6.1.4.1.9.9.600.1.3.10.1.4	Unsigned32	read-create	This object specifies the length of time allowed before retransmission of data to a device that is not responding to a request. This object is valid when cghMonKalParameterMethod is 'tcp' or 'httphead', provided cghMonKalParameterRate is 'standard'.
ROW cghMonKalParameterRowStatus	1.3.6.1.4.1.9.9.600.1.3.10.1.9	RowStatus	read-create	This object is used to create/delete an entry in the cghMonKalParameterTable.
STO cghMonKalParameterStorageType	1.3.6.1.4.1.9.9.600.1.3.10.1.8	StorageType	read-create	This object specifies the storage type for this conceptual row. If the value of this object in the row is 'permanent', then that corresponding row cannot be deleted, it can only be modified.
cghMonKalParameterTable	1.3.6.1.4.1.9.9.600.1.3.10		not-accessible	This table is used to configure the default parameters associated with each keepalive method, identified by cghMonKalParameterMethod.
STR cghMonKalPath	1.3.6.1.4.1.9.9.600.1.4.1.1.15	SnmpAdminString	read-create	This object specifies the server website queried in HTTPHEAD keepalive. The default for this object is the value of cghMonHttpHeadPath.
C32 cghMonKalPositiveProbes	1.3.6.1.4.1.9.9.600.1.4.3.1.4	Counter32	read-only	This object specifies the total number of keepalive probes sent to the remote device, identified by cgdAnswerAddress object, that resulted in a positive response.
CIS cghMonKalPrevStatus	1.3.6.1.4.1.9.9.600.1.2.1	CiscoGslbKeepaliveStatus	accessible-for-notify	This object is used for sending the value of cghMonKalStatus before transitioning to new state.
IP cghMonKalPrimaryTarget	1.3.6.1.4.1.9.9.600.1.4.1.1.6	InetAddress	read-create	This object specifies the primary target device IP address used by this keepalive. The type of IP address is identified by cghMonKalPrimaryTargetType. This object is mandatory provided cghMonKalTargetType is 'shared'.
IPt cghMonKalPrimaryTargetType	1.3.6.1.4.1.9.9.600.1.4.1.1.5	InetAddressType	read-create	This object specifies the primary target device IP address type used by this keepalive.
STR cghMonKalQueryDomainName	1.3.6.1.4.1.9.9.600.1.4.1.1.14	SnmpAdminString	read-create	This object specifies the name of the domain name server to which an ns keepalive is sent. The default for this object is the value of cghMonNsQueryDomainName.
C32 cghMonKalReceivedProbes	1.3.6.1.4.1.9.9.600.1.4.3.1.3	Counter32	read-only	This object specifies the total number of keepalive probes received from the remote device, identified by cgdAnswerAddress object.
ROW cghMonKalRowStatus	1.3.6.1.4.1.9.9.600.1.4.1.1.22	RowStatus	read-create	This object is used to create/delete an entry in the cghMonKalConfigTable.
IP cghMonKalSecondaryTarget	1.3.6.1.4.1.9.9.600.1.4.1.1.18	InetAddress	read-create	This object specifies the secondary target device IP address used by this keepalive. The type of IP address is identified by cghMonKalSecondaryTargetType object. Secondary target is used when the primary target is not available. This object is valid when cghMonKalMethod is 'kalap'.
IPt cghMonKalSecondaryTargetType	1.3.6.1.4.1.9.9.600.1.4.1.1.17	InetAddressType	read-create	This object specifies the secondary target device IP address type used by this keepalive. This object is valid when cghMonKalMethod is 'kalap'.
C32 cghMonKalSentProbesEx	1.3.6.1.4.1.9.9.600.1.4.3.1.2	Counter32	read-only	This object specifies the total number of keepalive probes sent to the remote device, identified by cgdAnswerAddress. This value of this object is sum of cghMonKalPositiveProbes & cghMonKalNegativeProbes
ROW cghMonKalShAnsRowStatus	1.3.6.1.4.1.9.9.600.1.4.2.1.2	RowStatus	read-create	This object is used to create/delete an entry in the cghMonKalSharedAnswerTable.
STO cghMonKalShAnsStoragetype	1.3.6.1.4.1.9.9.600.1.4.2.1.1	StorageType	read-create	This object specifies the storage type for this conceptual row.
cghMonKalSharedAnswerEntry	1.3.6.1.4.1.9.9.600.1.4.2.1		not-accessible	An entry containing the per shared keepalive to answer association. Entries can be added/deleted by administrator action. Entries are added when a shared keepalive is required to be associated with an answer.
cghMonKalSharedAnswerTable	1.3.6.1.4.1.9.9.600.1.4.2		not-accessible	This table is used for associating a shared keepalive with an answer.
cghMonKalStatsEntry	1.3.6.1.4.1.9.9.600.1.4.3.1		not-accessible	An entry containing statistics for a keepalive instance. Entries are added/deleted when the corresponding entries in the cghMonKalConfigTable are added/deleted.
cghMonKalStatsTable	1.3.6.1.4.1.9.9.600.1.4.3		not-accessible	This table provides the statistics of each keepalive configured on the device.
CIS cghMonKalStatus	1.3.6.1.4.1.9.9.600.1.4.3.1.1	CiscoGslbKeepaliveStatus	read-only	This object provides the status of the keepalive.
C32 cghMonKalStatusTransitions	1.3.6.1.4.1.9.9.600.1.4.3.1.6	Counter32	read-only	This object specifies the total number of status transitions of cghMonKalStatus, from 'offline' to 'online' and vice versa.
STO cghMonKalStorageType	1.3.6.1.4.1.9.9.600.1.4.1.1.21	StorageType	read-create	This object specifies the storage type for this conceptual row.
STR cghMonKalTagName	1.3.6.1.4.1.9.9.600.1.4.1.1.10	SnmpAdminString	read-create	This object specifies the tag for identifying a specific target, identified by cgdAnswerAddress object, on content switching device. This object is valid when cghMonKalMethod is 'kalap' provided cghMonKalKalapType is 'kalapByTag'.
CIS cghMonKalTargetType	1.3.6.1.4.1.9.9.600.1.4.1.1.2	CiscoGslbKeepaliveTargetType	read-create	This object specifies the answer type to which this keepalive is associated.
U32 cghMonKalTrapRateLimit	1.3.6.1.4.1.9.9.600.1.3.9	Unsigned32	read-only	This object specifies the maximum rate at which the ciscoGslbKalEventStatus notifications can be sent.
C32 cghMonKalVIPFailovers	1.3.6.1.4.1.9.9.600.1.4.3.1.8	Counter32	read-only	This object specifies the number of times the VIP switched from primary to secondary target and vice versa. The primary and secondary targets are identified by cghMonKalSecondaryTarget and cghMonKalPrimaryTarget objects respectively.
cghMonNotifControl	1.3.6.1.4.1.9.9.600.1.1
cghMonNotifObjects	1.3.6.1.4.1.9.9.600.1.2
STR cghMonNsQueryDomainName	1.3.6.1.4.1.9.9.600.1.3.1	SnmpAdminString	read-write	This object specifies the default doman name for a keepalive identified by cghMonKalMethod value of 'ns'.
CIS cghMonTcpConnTermMethod	1.3.6.1.4.1.9.9.600.1.3.5	CiscoGslbTerminationMethod	read-write	This object specifies the default connection termination method for a keepalive with cghMonKalMethod as 'tcp'.
U32 cghMonTotalConfiguredProbes	1.3.6.1.4.1.9.9.600.1.3.7	Unsigned32	read-only	This object specifies the total number of keepalive probes configured on the GSLB device by the administrator. This value corresponds to the number of entries in the cghMonKalConfigTable.
ciscoGslbGeneralConfigGroup	1.3.6.1.4.1.9.9.600.2.2.1			A collection of objects providing general GSLB keepalive configuration.
ciscoGslbGeneralConfigRateLimitGroup	1.3.6.1.4.1.9.9.600.2.2.8			A collection of objects providing information on notifications dropped and rate limit for notifications.
ciscoGslbHealthMonMIB	1.3.6.1.4.1.9.9.600			The MIB defines objects related to global keepalive properties in GSLB devices. It contains the tables for keep alive configuration and statistics. It also defines related notifications. Acronyms and their description: Keepalive : Keepalive is a method by which the GSLB device periodically checks to see if a resource associated with an answer is still active. The action of checking is known as a keepalive probe. Shared -keepalive : The GSLB device supports the use of shared keepalives to minimize traffic between the GSLB device and the SLBs(Server Load Balancing) that it is monitoring. A shared keepalive identifies a common IP address or resource that provides status for multiple answers. Shared keepalives periodically provide state information (online, offline) of the resources to the GSLB device. VIP : Virtual IP Addresses are used by SLBs to represent content hosted on one or more servers under their control. The use of VIPs is to route content to the proper requesting host without exposing the device's internal IP address. CAPP : Content Application Peering Protocol(CAPP) is a protocol used for intercommunication between content switching devices. Answer : Refers to resources to which the GSLB device resolves DNS requests that it receives. There are three possible types of answers: Virtual IP (VIP) : Addresses associated with a SLB, a web server, a cache, etc. Name Server (NS) : Configured DNS name server on the network that can answer queries that the GSLB device can not resolve. Content Routing : A device which uses a Agent (CRA) resolution process called DNS race to send identical and simultaneous responses back to client D-proxy for proximity determination. HTTPHEAD : The HTTP HEAD keepalive type sends a TCP format HTTP HEAD request to a web server at an address you specify, returning the online status of the device (in the form of a 200 response) as well as information on the web page status and content size.
ciscoGslbHealthMonMIBCompliance	1.3.6.1.4.1.9.9.600.2.1.1			Compliance statement for entities which implement the Cisco GSLB HEALTH MON MIB
ciscoGslbHealthMonMIBCompliances	1.3.6.1.4.1.9.9.600.2.1
ciscoGslbHealthMonMIBConform	1.3.6.1.4.1.9.9.600.2
ciscoGslbHealthMonMIBGroups	1.3.6.1.4.1.9.9.600.2.2
ciscoGslbHealthMonMIBNotifs	1.3.6.1.4.1.9.9.600.0
ciscoGslbHealthMonMIBObjects	1.3.6.1.4.1.9.9.600.1
ciscoGslbKalConfigGroup	1.3.6.1.4.1.9.9.600.2.2.3			A collection of objects providing per keepalive configuration.
NTF ciscoGslbKalEventStatus	1.3.6.1.4.1.9.9.600.0.1			This notification is sent when ever the value of cghMonKalStatus changes.
ciscoGslbKalNotifControlGroup	1.3.6.1.4.1.9.9.600.2.2.5			This group of objects controls the sending of notifications defined in this MIB module.
ciscoGslbKalNotificationGroup	1.3.6.1.4.1.9.9.600.2.2.7			A collection of objects providing GSLB events.
ciscoGslbKalNotifObjectsGroup	1.3.6.1.4.1.9.9.600.2.2.6			This group of objects is used to convey information for notifications defined in this MIB module.
ciscoGslbKalParameterGroup	1.3.6.1.4.1.9.9.600.2.2.2			A collection of objects providing general GSLB keepalive parameter configuration.
ciscoGslbKalStatsGroup	1.3.6.1.4.1.9.9.600.2.2.4			A collection of objects providing per keepalive status and statistics.

RFC description

Global Server Load Balancing keepalive probes and health monitoring for server resources.

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