CISCO-IETF-SCTP-EXT-MIB

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Last Updated: 2001-11-09

Category: Cisco Devices, IP and Core Protocols

Description: Extends the IETF SCTP MIB with Cisco-specific objects for Stream Control Transmission Protocol management.

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What Is CISCO-IETF-SCTP-EXT-MIB?

CISCO-IETF-SCTP-EXT-MIB extends the base CISCO-IETF-SCTP-MIB with additional Cisco-specific objects for managing the Stream Control Transmission Protocol (SCTP, RFC 2960), used where SCTP transports signaling traffic such as SIGTRAN or Diameter. It exposes association-level configuration such as retransmission timeout bounds (RTO min/max/initial), cookie lifetime, and statistics on retransmitted chunks and destination address failures. This makes it useful for monitoring the software/protocol health of SCTP associations, since rising retransmission counts or destination address failures reveal path instability or an unreachable peer endpoint before the association fails outright. It is explicitly an extension to, and dependent on, the base CISCO-IETF-SCTP-MIB for core association objects. It is typically deployed on Cisco platforms acting as signaling gateways or media gateway controllers using SCTP transport. Engineers can download the CISCO-IETF-SCTP-EXT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-IETF-SCTP-EXT-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 signaling gateways
Cisco media gateway controllers

Monitoring Examples

An operator polls cSctpAssocExtTable (cSctpAssocExtEntry rows) for cSctpAssocExtRtoMin, cSctpAssocExtRtoMax, and cSctpAssocExtRtoInitial to confirm retransmission timers are tuned appropriately for the network path, while watching scalar counters cSctpStatRtxChucks and cSctpStatRtxChucksFast for a sudden increase indicating packet loss. A climbing cSctpStatDestAddressFailures count alongside cSctpCtrlMaxHeld approaching its configured limit would signal that a multi-homed SCTP peer's alternate destination address has become unreachable.

What Can Be Monitored

retransmitted chunk counts
destination address failures
RTO min/max/initial timers
cookie lifetime
held association count
address state change notifications

Imported Objects

From CISCO-IETF-SCTP-MIB

cSctpAssocEntry	OBJECT-TYPE
cSctpAssocRemAddressEntry	OBJECT-TYPE
cSctpAssocRemAddressStatus	OBJECT-TYPE

From CISCO-SMI

ciscoExperiment

OBJECT-IDENTITY

From INET-ADDRESS-MIB

InetAddress
InetAddressType

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TimeStamp
TruthValue

How to Use in IPNetwork Monitor

Example using cSctpStatRtxChucks OID:

Select a Cisco signaling gateway or media gateway controller 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 cSctpStatRtxChucks into the Find box to locate it in the OID tree, then select it and click OK. It reports the number of SCTP chunks retransmitted due to the T3 timers expiring before the packet is acknowledged. 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 chunks), 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
cSctpExtMIB	1.3.6.1.4.1.9.10.76			An extension to the CISCO-IETF-SCTP-MIB.my used to provide additional information to manage the Stream Control Transmission Protocol (RFC 2960).
cSctpExtNotifications	1.3.6.1.4.1.9.10.76.0
NTF cSctpExtDestAddressStateChange	1.3.6.1.4.1.9.10.76.0.1			The notification is generated when the state transition of cSctpAssocRemAddressStatus has occurred.
cSctpExtObjects	1.3.6.1.4.1.9.10.76.1
cSctpScalarsExt	1.3.6.1.4.1.9.10.76.1.1
C32 cSctpStatRtxChucksEx	1.3.6.1.4.1.9.10.76.1.1.1	Counter32	read-only	Number of SCTP chunks retransmitted due to the T3 timers expiring before the packet is acknowledged.
C32 cSctpStatRtxChucksFast	1.3.6.1.4.1.9.10.76.1.1.2	Counter32	read-only	Number of SCTP chunks retransmitted using the fast-recovery retransmission mechanism specified in [sctp].
C32 cSctpStatDestAddressFailures	1.3.6.1.4.1.9.10.76.1.1.3	Counter32	read-only	The accumulated number of times a destination IP address was marked unavailable since the start of this association. The IP destination address will be marked unavailable when the specified number of retransmissions have failed.
U32 cSctpCtrlPurgeTimeout	1.3.6.1.4.1.9.10.76.1.1.4	Unsigned32	read-write	The amount of time the SCTP protocol software will wait before purging an associations TCB. An association TCB will exist until a management station sets the cSctpAssocState to deleteTCB or is purge by the protocol implementation. The protocol implementation will purge an association TCB using a combination of cSctpCtrlPurgeTimeout and cSctpCtrlMaxHeld. The cSctpCtrlPurgeTimeout ranges from the minimum of one hour to roughly one month. The default value is roughly one day.
U32 cSctpCtrlMaxHeld	1.3.6.1.4.1.9.10.76.1.1.5	Unsigned32	read-write	The maximum number of association TCBS that will be held after they have been marked closed and are no longer providing service. This limit is used to prevent excessive waste of resources.
T/F cSctpAddressStateNotifEnabled	1.3.6.1.4.1.9.10.76.1.1.6	TruthValue	read-write	This object controls the generation of cSctpExtDestAddressStateChange as follows: 'true' Indicates that an address state change notification is to be generated whenever a IP address used by one or more associations becomes available or unavailable. That is, the notification generation is enabled. 'false' Indicates that an address state change notification generation is disabled.
cSctpExtTables	1.3.6.1.4.1.9.10.76.1.2
cSctpAssocExtTable	1.3.6.1.4.1.9.10.76.1.2.1		not-accessible	A table containing SCTP association-specific information.
cSctpAssocExtEntry	1.3.6.1.4.1.9.10.76.1.2.1.1		not-accessible	General common variables and statistics for the whole association.
U32 cSctpAssocExtRtoMin	1.3.6.1.4.1.9.10.76.1.2.1.1.1	Unsigned32	read-only	The minimum value permitted by a SCTP implementation for the retransmission timeout, measured in milliseconds. More refined semantics for objects of this type depend upon the algorithm used to determine the retransmission timeout. Minimum recommended value is 1000 milliseconds. Some telephony applications could require less than 1 second, see [SIGAS] for further information.
U32 cSctpAssocExtRtoMax	1.3.6.1.4.1.9.10.76.1.2.1.1.2	Unsigned32	read-only	The maximum value permitted by a SCTP implementation for the retransmission timeout, measured in milliseconds. More refined semantics for objects of this type depend upon the algorithm used to determine the retransmission timeout. Recommended value is 60000 milliseconds.
U32 cSctpAssocExtRtoInitial	1.3.6.1.4.1.9.10.76.1.2.1.1.3	Unsigned32	read-only	Initial value for the Retransmission timer. Recommended value is 3000 milliseconds.
U32 cSctpAssocExtValCookieLife	1.3.6.1.4.1.9.10.76.1.2.1.1.4	Unsigned32	read-only	Valid cookie life in the 4-way start-up handshake procedure. Recommended value: 60000 milliseconds.
U32 cSctpAssocExtMaxInitRetr	1.3.6.1.4.1.9.10.76.1.2.1.1.5	Unsigned32	read-only	The maximum number of retransmissions at the start-up phase (INIT and COOKIE ECHO chunks). Recommended value: 8 attempts.
U32 cSctpAssocExtMTU	1.3.6.1.4.1.9.10.76.1.2.1.1.6	Unsigned32	read-only	The Maximum Transmission Size to be used by this association. The size will the smallest MTU size supported by any of the IP Addresses used by the association.
U32 cSctpAssocExtLocRecWnd	1.3.6.1.4.1.9.10.76.1.2.1.1.7	Unsigned32	read-only	The current local receive window size for this association.
G32 cSctpAssocExtLocRecWndLowMark	1.3.6.1.4.1.9.10.76.1.2.1.1.8	Gauge32	read-only	Low water mark for Local Receive Window Size.
C32 cSctpAssocExtLocRecWndZeroCnt	1.3.6.1.4.1.9.10.76.1.2.1.1.9	Counter32	read-only	Number of times the Local Receive window reached zero bytes.
U32 cSctpAssocExtRemRecWnd	1.3.6.1.4.1.9.10.76.1.2.1.1.10	Unsigned32	read-only	The Remote Receive Window Size for this association.
G32 cSctpAssocExtRemRecWndLowMark	1.3.6.1.4.1.9.10.76.1.2.1.1.11	Gauge32	read-only	Low water mark for Remote Receive Window Size.
C32 cSctpAssocExtRemRecWndZeroCnt	1.3.6.1.4.1.9.10.76.1.2.1.1.12	Counter32	read-only	Number of times the Remote Receive window reached zero bytes.
G32 cSctpAssocExtUlpQueued	1.3.6.1.4.1.9.10.76.1.2.1.1.13	Gauge32	read-only	Current number of IP datagrams waiting to be sent.
G32 cSctpAssocExtUlpQueuedHW	1.3.6.1.4.1.9.10.76.1.2.1.1.14	Gauge32	read-write	High water mark for data grams waiting to be sent. Resetting this object is achieved by setting this object to 0. Attempting to set this object to any other value will result in a wrongValue error.
TIM cSctpAssocExtUlpQueuedRT	1.3.6.1.4.1.9.10.76.1.2.1.1.15	TimeStamp	read-only	The time when cSctpAssocUlpQueuedHW was set to 0.
C32 cSctpAssocExtChunksRecControl	1.3.6.1.4.1.9.10.76.1.2.1.1.16	Counter32	read-only	Number of control Chucks received by this association.
C32 cSctpAssocExtChunksRecOrdered	1.3.6.1.4.1.9.10.76.1.2.1.1.17	Counter32	read-only	Number of Chucks received by this association where order is required.
C32 cSctpAssocExtChunksRecUnOrdered	1.3.6.1.4.1.9.10.76.1.2.1.1.18	Counter32	read-only	Number of Chucks received by this association where order is not required.
C32 cSctpAssocExtChunksSentControl	1.3.6.1.4.1.9.10.76.1.2.1.1.19	Counter32	read-only	Number of control Chucks sent by this association.
C32 cSctpAssocExtChunksSentOrdered	1.3.6.1.4.1.9.10.76.1.2.1.1.20	Counter32	read-only	Number of Chucks sent by this association where order is required.
C32 cSctpAssocExtChunksSentUnOrdered	1.3.6.1.4.1.9.10.76.1.2.1.1.21	Counter32	read-only	Number of Chucks sent by this association where order is not required.
C32 cSctpAssocExtDatagramsRec	1.3.6.1.4.1.9.10.76.1.2.1.1.22	Counter32	read-only	Number of IP datagrams received by this association.
C32 cSctpAssocExtDatagramsSent	1.3.6.1.4.1.9.10.76.1.2.1.1.23	Counter32	read-only	Number of IP datagrams sent by this association.
IPt cSctpAssocExtEffectiveAddrType	1.3.6.1.4.1.9.10.76.1.2.1.1.24	InetAddressType	read-only	Internet type of effective destination IP address. This is the type of IP address to which traffic is currently sent for this association.
IP cSctpAssocExtEffectiveAddress	1.3.6.1.4.1.9.10.76.1.2.1.1.25	InetAddress	read-only	Effective destination IP address. This is the IP address to which traffic is currently sent for this association. This value can be any of the IP addresses defined in the cSctpAssocRemAddressExtTable Table.
C32 cSctpAssocExtRtxChunksFast	1.3.6.1.4.1.9.10.76.1.2.1.1.26	Counter32	read-only	The accumulated number of SCTP chunks retransmitted using the fast-recovery retransmission mechanism specified in [sctp] since the start of this association.
T/F cSctpAssocExtBundleFlag	1.3.6.1.4.1.9.10.76.1.2.1.1.27	TruthValue	read-only	This objects indicates if the SCTP protocol allows chunks to be bundled into a single datagram as follows: 'true(1)' Indicates that chunks will be bundled. 'false(2)' Indicates that chunks will not be bundled.
U32 cSctpAssocExtBundleTimeout	1.3.6.1.4.1.9.10.76.1.2.1.1.28	Unsigned32	read-only	The amount time to wait to allow data chunks to accumulate so that they can be transmitted in the same datagram. The arrival of the first data chunk will start a timer that will expire in the specified milliseconds. All later chunks will be delayed until the timer expires. When the timer expires the data chunks will be sent out in one or more datagrams.
cSctpAssocRemAddressExtTable	1.3.6.1.4.1.9.10.76.1.2.2		not-accessible	Expanded table of cSctpAssocRemAddressExtTable based on the AssocId index.
cSctpAssocRemAddressExtEntry	1.3.6.1.4.1.9.10.76.1.2.2.1		not-accessible	Additional information about destination IP addresses.
C32 cSctpAssocRemAddressFailedCnt	1.3.6.1.4.1.9.10.76.1.2.2.1.1	Counter32	read-only	Number of times the destination address was marked as failed.
U32 cSctpAssocRemAddressSRTT	1.3.6.1.4.1.9.10.76.1.2.2.1.2	Unsigned32	read-only	The Smoothed Round Trip Time(SRTT) is obtained by averaging the measured Rount trip times(RTT) between the local and remote systems on an IP Network. A value of '0' is reported for SRTT prior to the first successful RTT calculation.
cSctpExtConformance	1.3.6.1.4.1.9.10.76.3
cSctpExtCompliances	1.3.6.1.4.1.9.10.76.3.1
cSctpExtCompliance	1.3.6.1.4.1.9.10.76.3.1.1			The compliance statement for CISCO-IETF-SCTP-EXT-MIB.my.
cSctpExtComplianceRev1	1.3.6.1.4.1.9.10.76.3.1.2			The compliance statement for CISCO-IETF-SCTP-EXT-MIB.my.
cSctpExtGroups	1.3.6.1.4.1.9.10.76.3.2
cSctpExtStatGroup	1.3.6.1.4.1.9.10.76.3.2.1			A collection of objects providing SCTP per system basis statistics for all associations.
cSctpExtCtrlGroup	1.3.6.1.4.1.9.10.76.3.2.2			A collection of objects providing SCTP per system basis control behavior for all associations.
cSctpExtAssocCtrlGroup	1.3.6.1.4.1.9.10.76.3.2.3			Objects used to control the behavior each association.
cSctpExtAssocStatGroup	1.3.6.1.4.1.9.10.76.3.2.4			Objects used to collect information and statistics on each association.
cSctpExtAssocRemAddrGroup	1.3.6.1.4.1.9.10.76.3.2.5			Objects used to collect information and statistics on each destination IP address.
cSctpExtAssocNotificationsGroup	1.3.6.1.4.1.9.10.76.3.2.6			Object used to provide notifications of state changes on destination IP addresses.
cSctpExtCtrlGroupRev1	1.3.6.1.4.1.9.10.76.3.2.7			A collection of objects providing SCTP per system basis control behavior for all associations.
cSctpExtAssocStatGroupRev1	1.3.6.1.4.1.9.10.76.3.2.8			Objects used to collect information and statistics on each association.

RFC description

Cisco extension MIB for Stream Control Transmission Protocol (SCTP) management. Extends IETF SCTP MIB with Cisco-specific monitoring objects for SCTP association statistics and configuration.

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Download CISCO-IETF-SCTP-EXT-MIB