CISCO-CAT6k-NAT-STAT-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2019-06-11

Category: Cisco Devices, IP and Core Protocols

Description: Monitors Network Address Translation (NAT) statistics on Cisco Catalyst 6000 series switches.

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What Is CISCO-CAT6k-NAT-STAT-MIB?

CISCO-CAT6k-NAT-STAT-MIB provides platform-specific statistics for Network Address Translation (NAT) processing on Cisco Catalyst 6000/6500 series switches. It exposes NAT type and NetFlow type in use, per-category (dynamic, static, other) NAT entry table utilization, total NAT entry counts, and overall NAT resource utilization. Its monitoring value is centered on software/hardware resource capacity: tracking ciscoCat6kNatDynamicEntryUtilization and ciscoCat6kNatResourceUtilization against platform limits reveals when the NAT translation table is nearing exhaustion, which can cause new connections to fail. It is a Cisco-proprietary companion MIB, closely tied to the standard NAT-MIB concepts but tailored to Catalyst 6000 hardware-assisted NAT/NetFlow forwarding. It is deployed on Catalyst 6500/6000 series switches performing hardware-accelerated NAT in enterprise or service provider edge networks. Engineers can download the CISCO-CAT6k-NAT-STAT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-CAT6k-NAT-STAT-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 Catalyst 6000/6500 series switch

Monitoring Examples

An admin would poll ciscoCat6kNatDynamicEntryUtilization and ciscoCat6kNatStaticEntryUtilization alongside ciscoCat6kNatTotalEntryCount to see how close the switch is to its NAT table capacity limit. A rising ciscoCat6kNatResourceUtilization value approaching 100% would explain new translated sessions failing to establish. Checking ciscoCat6kNatType and ciscoCat6kNatNetFlowType confirms which NAT/NetFlow mode the switch is currently operating in.

What Can Be Monitored

NAT entry utilization by type
total NAT entry count
overall NAT resource utilization
NAT/NetFlow type configuration

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using ciscoCat6kNatTotalEntryCount OID:

Select a Cisco Catalyst 6000/6500 series switch 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 ciscoCat6kNatTotalEntryCount into the Find box to locate it in the OID tree, then select it and click OK. This object gives consolidated count of static as well as dynamic entries present in the system. 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, 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
ciscoCat6kNatStatMIB	1.3.6.1.4.1.9.9.861			The cisco catalyst 6000 Nat stat mib provides information about NAT platform specific statistics in the system
ciscoCat6kNatStatMIBObjects	1.3.6.1.4.1.9.9.861.1
ciscoCat6kNatStatus	1.3.6.1.4.1.9.9.861.1.2
NAT ciscoCat6kNatType	1.3.6.1.4.1.9.9.861.1.2.1	NatType	read-only	NAT type can be Static, Dynamic, Mixed and other. Static should be displayed when static rules are hit. Dynamic should be displayed when dynamic rules are hit. If traffic hits rmap/pat rules, it should display as Other.
NET ciscoCat6kNatNetFlowType	1.3.6.1.4.1.9.9.861.1.2.2	NetFlowType	read-only	Netflow type will be Layer-3 or Mixed. If the rules are hit based only on Layer 3 information, it should display as Layer-3.For static/dynamic nat it is L3,rmap and Pat uses L4 info and it is considered as Mixed.
NAT ciscoCat6kNatFlowRecord	1.3.6.1.4.1.9.9.861.1.2.3	NatBool	read-only	This object shows whether ip nat create flow config is enabled or not. By default it will be in enabled state only.
OCT ciscoCat6kNatDynamicEntryUtilization	1.3.6.1.4.1.9.9.861.1.2.4	OCTET STRING	read-only	This object gives total utilization of dynamic NAT entries present in the system.
OCT ciscoCat6kNatStaticEntryUtilization	1.3.6.1.4.1.9.9.861.1.2.5	OCTET STRING	read-only	This object gives total utilization of static NAT entries present in the system.
OCT ciscoCat6kNatOtherEntryUtilization	1.3.6.1.4.1.9.9.861.1.2.6	OCTET STRING	read-only	This object gives total utilization of other NAT (PAT,RMAP,Etc.) entries present in the system.
C32 ciscoCat6kNatTotalEntryCountEx	1.3.6.1.4.1.9.9.861.1.2.7	Counter32	read-only	This object gives consolidated count of static as well as dynamic entries present in the system.
OCT ciscoCat6kNatResourceUtilization	1.3.6.1.4.1.9.9.861.1.2.8	OCTET STRING	read-only	Total system resource used by the system
ciscoCat6kNatStatMIBConformance	1.3.6.1.4.1.9.9.861.2
ciscoCat6kNatStatMIBCompliances	1.3.6.1.4.1.9.9.861.2.1
ciscoCat6kNatStatMIBComplianceVer1	1.3.6.1.4.1.9.9.861.2.1.1			The compliance statement for CISCO-CAT6k-NAT-STAT-MIB
ciscoCat6kNatStatMIBGroups	1.3.6.1.4.1.9.9.861.2.2
ciscoCat6kNatStatGroup	1.3.6.1.4.1.9.9.861.2.2.1			A collection of objects providing status of NAT statistics

RFC description

Provides NAT (Network Address Translation) statistics and platform-specific information for Cisco Catalyst 6000 switches.

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Download CISCO-CAT6k-NAT-STAT-MIB