CISCO-STUN-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 1995-08-21

Category: Cisco Devices, SNA and Legacy Protocols

Description: Manages Serial Tunnel (STUN) encapsulation for transporting SNA and BISYNC traffic over IP networks.

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What Is CISCO-STUN-MIB?

CISCO-STUN-MIB is a Cisco enterprise MIB for Serial Tunnel (STUN), a legacy Cisco feature that encapsulates SNA and BISYNC serial protocol traffic for transport over an IP network between two Cisco routers acting as tunnel endpoints. It exposes configuration and operational data organized into global STUN settings, STUN groups, STUN ports, and STUN routes, including protocol type per group and default peer addressing per port. Its monitoring value lies in the operational status of the serial tunneling relationship: administrators track group and port configuration, peer IP/serial-interface bindings, and route table entries to confirm a STUN tunnel is correctly paired end-to-end and forwarding legacy traffic as expected. It has no significant external MIB dependency beyond standard Cisco enterprise conventions, being a self-contained legacy feature MIB. It is deployed on older Cisco routers bridging legacy SNA/BISYNC serial devices over modern IP backbones. Engineers can download the CISCO-STUN-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-STUN-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 with Serial Tunnel (STUN) feature

Monitoring Examples

An administrator would walk stunGroupTable/stunGroupEntry to check stunProtocolType per stunGroupIndex, confirming the correct legacy protocol (e.g., SDLC/BISYNC) is configured for that tunnel group. Reviewing stunPortTable/stunPortEntry for stunPortDefaultPeerIP and stunPortDefaultPeerSerialInterface would verify a port's default peer is correctly bound to the remote router and serial line, and stunRouteTable entries would show which specific routes are established. A port showing an unreachable or mismatched stunPortDefaultPeerIP would explain a broken serial-over-IP connection between the two Cisco routers.

What Can Be Monitored

STUN group protocol type
STUN port default peer IP/serial interface
STUN route table entries
global STUN IP address configuration

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From IF-MIB

InterfaceIndex
ifIndex	OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

TruthValue

How to Use in IPNetwork Monitor

Example using stunRouteRxPackets OID:

Select a Cisco router with Serial Tunnel (STUN) feature (legacy) 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 stunRouteRxPackets 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. It reports the count of frames received from the serial interface with this station's address. 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
ciscoStunMIB	1.3.6.1.4.1.9.9.30			The MIB module for serial Tunneling. Overview of STUN MIB MIB description The STUN MIB provides the configuration and operational information on Cisco's serial tunnelling implementation. The following entities are managed: 1) Global STUN information 2) STUN groups 3) STUN ports 4) STUN routes The following example configuration shows how the STUN MIB returns STUN information, from either CISCO A or CISCO B. HOST == SDLC == Cisco A == IP Network == Cisco B == SDLC == SDLC line line device 1) The STUN global entry identifies the IP address by which the router is known to other STUN peers. 2) The STUN group table identifies the STUN group number and protocol type that Cisco A and Cisco B use to route SDLC traffic over the IP network. The table contains an entry for each STUN group defined on the router. 3) The STUN port table identifies the serial interface to the SDLC line for which the router is doing serial tunnelling. The MIB also identifies the STUN group this interface is defined for, and identifies the default routing for unrecognized SDLC addresses. There is a port entry for each STUN-enabled interface on the router. 4) The STUN route table has an entry for each address defined for routing within the STUN group, and an entry for the default routing if the 'stun route all' command is configured. The route entry includes identification of the STUN peer, priority, state, whether local acknowledgment is enabled, and packet and byte counters.
stunObjects	1.3.6.1.4.1.9.9.30.1
stunGlobal	1.3.6.1.4.1.9.9.30.1.1
IP stunIPAddr	1.3.6.1.4.1.9.9.30.1.1.1	IpAddress	read-only	The configured IP address used for all serial tunnelling in this router.
stunGroups	1.3.6.1.4.1.9.9.30.1.2
stunGroupTable	1.3.6.1.4.1.9.9.30.1.2.1		not-accessible	A table of entries representing STUN groups configured on the router. Each STUN-enabled interface is assigned to a STUN group, and packets can only travel between STUN-enabled interfaces in the same group.
stunGroupEntry	1.3.6.1.4.1.9.9.30.1.2.1.1		not-accessible	Status and parameter values for a group.
INT stunGroupIndex	1.3.6.1.4.1.9.9.30.1.2.1.1.1	INTEGER	not-accessible	The configured STUN group number.
INT stunProtocolType	1.3.6.1.4.1.9.9.30.1.2.1.1.2	INTEGER	read-only	The protocol type for this STUN group.
stunPorts	1.3.6.1.4.1.9.9.30.1.3
stunPortTable	1.3.6.1.4.1.9.9.30.1.3.1		not-accessible	A list of STUN-enabled interfaces (ports).
stunPortEntry	1.3.6.1.4.1.9.9.30.1.3.1.1		not-accessible	Status and parameter values for a STUN port.
INT stunPortGroupIndex	1.3.6.1.4.1.9.9.30.1.3.1.1.1	INTEGER	read-only	The group number to which the stun port belongs. Frames will only be routed to other ports (on this or another router) in the same stun group. This group must match a stunGroupIndex in the stunGroupTable.
INT stunPortDefaultPeerType	1.3.6.1.4.1.9.9.30.1.3.1.1.2	INTEGER	read-only	The type of identification of the default partner for unrecognized addresses. If there is no default route then the stunRouteType field of stunPortDefaultRemote is 'other'. If ip then the value is in stunRouteIP; if serial or serialDirect then the value is in stunRouteSerial.
IP stunPortDefaultPeerIP	1.3.6.1.4.1.9.9.30.1.3.1.1.3	IpAddress	read-only	The ip address of the remote default STUN partner, for unrecognized addresses. 0.0.0.0 is returned if the default route type is not ip.
NUM stunPortDefaultPeerSerialInterface	1.3.6.1.4.1.9.9.30.1.3.1.1.4	InterfaceIndex	read-only	If stunRouteType is serial then this is the serial interface index of the point-to-point link to the remote partner; if stunRouteType is serialDirect then the partner is in the local STUN. if stunRouteType is ip then this field is 0.
stunRoutes	1.3.6.1.4.1.9.9.30.1.4
stunRouteTable	1.3.6.1.4.1.9.9.30.1.4.1		not-accessible	A table containing information about specific SDLC addresses. There is one table entry for each SDLC address configured by the STUN ROUTE command.
stunRouteEntry	1.3.6.1.4.1.9.9.30.1.4.1.1		not-accessible	The information regarding a single STUN address.
INT stunRouteStationAddress	1.3.6.1.4.1.9.9.30.1.4.1.1.1	INTEGER	not-accessible	The poll address of the station. 256 indicates the ALL parameter on the STUN ROUTE command, which is the route for all unrecognized addresses.
INT stunRouteType	1.3.6.1.4.1.9.9.30.1.4.1.1.2	INTEGER	read-only	The type of identification of the remote partner.
IP stunRouteRemoteIP	1.3.6.1.4.1.9.9.30.1.4.1.1.3	IpAddress	read-only	The ip address of the remote STUN partner. 0.0.0.0 if partner type is not ip.
NUM stunRouteSerialInterface	1.3.6.1.4.1.9.9.30.1.4.1.1.4	InterfaceIndex	read-only	The local interface index to the remote partner. 0 is returned if the partner type is not direct or frameRelay.
INT stunRoutePriority	1.3.6.1.4.1.9.9.30.1.4.1.1.5	INTEGER	read-only	The priority with which this station's traffic will be routed across the network.
INT stunRoutePeerState	1.3.6.1.4.1.9.9.30.1.4.1.1.6	INTEGER	read-only	The state of the peer connection through the STUN tunnel.
T/F stunRouteLocalAck	1.3.6.1.4.1.9.9.30.1.4.1.1.7	TruthValue	read-only	Indicates if the STUN connection is locally acknowledged. TRUE-> STUN connection is locally acknowledged FALSE-> STUN connection is not locally acknowledged
C32 stunRouteRxPacketsEx	1.3.6.1.4.1.9.9.30.1.4.1.1.8	Counter32	read-only	Count of frames received from the serial interface with this station's address.
C32 stunRouteTxPackets	1.3.6.1.4.1.9.9.30.1.4.1.1.9	Counter32	read-only	Count of frames transmitted at the serial interface with this station's address.
C32 stunRouteRxBytes	1.3.6.1.4.1.9.9.30.1.4.1.1.10	Counter32	read-only	Count of bytes received from the serial interface with this station's address.
C32 stunRouteTxBytes	1.3.6.1.4.1.9.9.30.1.4.1.1.11	Counter32	read-only	Count of bytes transmitted at the serial interface with this station's address.
stunNotificationPrefix	1.3.6.1.4.1.9.9.30.2
stunNotifications	1.3.6.1.4.1.9.9.30.2.0
NTF stunPeerStateChangeNotification	1.3.6.1.4.1.9.9.30.2.0.1			This notification indicates that the state of a STUN route has transitioned to active (connected or direct) or inactive (dead or closed).
stunMibConformance	1.3.6.1.4.1.9.9.30.3
stunMibCompliances	1.3.6.1.4.1.9.9.30.3.1
stunMibCompliance	1.3.6.1.4.1.9.9.30.3.1.1			The compliance statement for STUN.
stunMibGroups	1.3.6.1.4.1.9.9.30.3.2
stunGlobalGroup	1.3.6.1.4.1.9.9.30.3.2.1			A collection of objects providing global STUN information.
stunGroupGroup	1.3.6.1.4.1.9.9.30.3.2.2			A collection of objects providing information about STUN groups .
stunPortGroup	1.3.6.1.4.1.9.9.30.3.2.3			A collection of objects providing information about STUN enabled interfaces.
stunRouteGroup	1.3.6.1.4.1.9.9.30.3.2.4			A collection of objects providing information about STUN defined routes.

RFC description

Serial Tunneling (STUN) MIB for Cisco routers, managing SDLC traffic tunneling over IP networks with group and routing configuration.

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Download CISCO-STUN-MIB