CISCO-DNS-CLIENT-MIB

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Organization: Cisco Systems Inc.

Last Updated: 2004-09-09

Category: Cisco Devices, IP and Core Protocols

Description: Manages DNS client configuration on Cisco devices, including resolver settings, name server lists, and domain search order.

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What Is CISCO-DNS-CLIENT-MIB?

CISCO-DNS-CLIENT-MIB manages the DNS resolver client configuration on Cisco devices, covering enable/disable state, the list of configured name servers, and the domain search order used for name resolution. It exposes a DNS server table (cdcDNSServerTable) with address type/address/row status per configured resolver, a default domain name, and a domain-name search table, all configuration-category data. Its monitoring role is software/service-configuration status — confirming DNS resolution is enabled (cdcDNSConfigEnable) and that the expected name servers are configured and active, since a misconfigured or empty resolver list can cause name-based operations (logging, authentication, software downloads) to fail even though the device itself is otherwise healthy. It's a self-contained Cisco enterprise MIB implementing the client side of the DNS protocol, with its Notifs/Objects/Conformance structure following standard SNMPv2-SMI/CONF conventions. It's deployed across Cisco routers, switches, and other network devices wherever DNS resolution is used for management or operational functions, and administrators typically inspect these objects using a CISCO-DNS-CLIENT-MIB MIB Browser session.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-DNS-CLIENT-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

Monitoring Examples

An operator would poll cdcDNSConfigEnable to confirm DNS resolution is turned on and iterate cdcDNSServerTable/cdcDNSServerEntry to verify the expected cdcDNSServerAddr entries are present with an active cdcDNSServerStatus. If cdcNoOfDNSServerConfig drops to zero or a configured server address goes missing, dependent services relying on hostname resolution would begin failing even though the device's core operation is unaffected.

What Can Be Monitored

DNS resolution enable/disable state
configured name server list
default DNS domain name
domain name search order

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From INET-ADDRESS-MIB

InetAddress
InetAddressType

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

RowStatus

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoDNSClientMIB	1.3.6.1.4.1.9.9.436			The MIB module for entities implementing the client side of the Domain Name System (DNS) protocol.
ciscoDNSClientMIBNotifs	1.3.6.1.4.1.9.9.436.0
ciscoDNSClientMIBObjects	1.3.6.1.4.1.9.9.436.1
cdcConfigGroup	1.3.6.1.4.1.9.9.436.1.1
INT cdcDNSConfigEnable	1.3.6.1.4.1.9.9.436.1.1.1	INTEGER	read-write	This object indicates whether the DNS configuration is enabled or disabled in the local system.
U32 cdcNoOfDNSServerConfig	1.3.6.1.4.1.9.9.436.1.1.2	Unsigned32	read-only	This object represents the current number of entries in the 'cdcDNSServerTable'. Indicates the number of DNS Server entries that are configured in the system.
U32 cdcDNSServerNextAvailIndex	1.3.6.1.4.1.9.9.436.1.1.3	Unsigned32	read-only	This object contains the next available value for the object 'cdcDNSServerIndex'. If all values are exhausted, then this object will contain a 0 value. A management application should read this object, get the (non-zero) value and use same for creating an entry in the 'cdcDNSServerTable'. If two network management applications read this object at the same time and try to create an entry in the 'cdcDNSServerTable', only one of them will succeed. The network management application which failed, will need to re-read this object and try the SET again.
cdcDNSServerTable	1.3.6.1.4.1.9.9.436.1.1.4		not-accessible	This table contains information about the Domain Name System (DNS) Server configurations in the system. When the DNS configuration is disabled in the system, i.e., 'cdcDNSConfigEnable' object is set to 'disabled', all entries of this table will be removed automatically. The index of this table is not persistent upon system reboot.
cdcDNSServerEntry	1.3.6.1.4.1.9.9.436.1.1.4.1		not-accessible	An Entry representing the information about a DNS Server configuration. The entries are contacted in turn by the system for DNS services. The first entry in this table will be contacted first, and so on.
U32 cdcDNSServerIndex	1.3.6.1.4.1.9.9.436.1.1.4.1.1	Unsigned32	not-accessible	This object represents the index corresponding to the particular DNS Server configuration in the system. For creation of new entry, the value of this object should be same as that of the value of 'cdcDNSServerNextAvailIndex' object. If this is not the case, then the entry creation will fail.
IPt cdcDNSServerAddrType	1.3.6.1.4.1.9.9.436.1.1.4.1.2	InetAddressType	read-create	This object represents the Inet Address type of the 'cdcDNSServerAddr' object. An attempt to modify this object will fail with an 'inconsistentValue' error, if the value of the corresponding instance of 'cdcDNSServerStatus' object is active(1).
IP cdcDNSServerAddr	1.3.6.1.4.1.9.9.436.1.1.4.1.3	InetAddress	read-create	This object represents the address of the DNS Server. This object is a mandatory object for row creation. An attempt to modify this object will fail with an 'inconsistentValue' error, if the value of the corresponding instance of 'cdcDNSServerStatus' object is active(1).
ROW cdcDNSServerStatus	1.3.6.1.4.1.9.9.436.1.1.4.1.4	RowStatus	read-create	The Status of this row.
STR cdcDefaultDNSDomainName	1.3.6.1.4.1.9.9.436.1.1.5	SnmpAdminString	read-write	This object represents the Default DNS domain name of the system. When this object is set to a non empty string value, the domain name part of the fully qualified name represented by the 'sysName' object is updated by the value of this object. When there is no entry in the 'cdcDNSDomainNameTable', the value of this object is used for the domain name configuration of the system. When there is an entry in the 'cdcDNSDomainNameTable', the value of this object is not used.
cdcDNSDomainNameTable	1.3.6.1.4.1.9.9.436.1.1.6		not-accessible	This table contains the list of DNS Domain Names defined for the system. Each domain name to be tried in turn, for the domain name configuration of the system.
cdcDNSDomainNameEntry	1.3.6.1.4.1.9.9.436.1.1.6.1		not-accessible	An entry (conceptual row) in the 'cdcDNSDomainNameTable'. Each row represents a DNS Domain name defined for the system.
U32 cdcDNSDomainNameIndex	1.3.6.1.4.1.9.9.436.1.1.6.1.1	Unsigned32	not-accessible	An arbitrary integer value, greater than zero, which uniquely identifies a DNS Domain Name defined for the system.
STR cdcDNSDomainName	1.3.6.1.4.1.9.9.436.1.1.6.1.2	SnmpAdminString	read-create	This object represents a DNS Domain Name defined for the system. When this object is set to a non empty string value, the domain name part of the fully qualified name represented by the 'sysName' object is updated by the value of this object. This object is a mandatory object for row creation. An attempt to modify this object will fail with an 'inconsistentValue' error, if the value of the corresponding instance of 'cdcDNSDomainNameStatus' object is active(1).
ROW cdcDNSDomainNameStatus	1.3.6.1.4.1.9.9.436.1.1.6.1.3	RowStatus	read-create	The status of this conceptual row. Once value of this object is set to 'active', the associated entry can not be modified except destroyed by setting this object to destroy(6).
ciscoDNSClientMIBConformance	1.3.6.1.4.1.9.9.436.2
ciscoDNSClientMIBCompliances	1.3.6.1.4.1.9.9.436.2.1
ciscoDNSClientMIBCompliance	1.3.6.1.4.1.9.9.436.2.1.1			The compliance statement for entities which implement the CISCO-DNS-CLIENT-MIB.
ciscoDNSClientMIBGroups	1.3.6.1.4.1.9.9.436.2.2
ciscoDNSServerConfigGroup	1.3.6.1.4.1.9.9.436.2.2.1			A collection of objects for DNS Server address Configuration.
ciscoDNSDomainNameConfigGroup	1.3.6.1.4.1.9.9.436.2.2.2			A collection of objects for DNS Domain Name Configuration.

RFC description

Manages DNS client configuration on Cisco devices including DNS server settings and resolver enablement.

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Download CISCO-DNS-CLIENT-MIB

What Is CISCO-DNS-CLIENT-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description