Internet Draft Network Working Group J. Pastor INTERNET-DRAFT M. Belinchon Ericsson expires in six months June 07,2000 Stream Control Transmission Protocol Management Information Base using SMIv2 <draft-ietf-sigtran-sctp-mib-01.txt> Status of This Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC 2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. Abstract The Stream Control Transmission Protocol (SCTP) a reliable transport protocol operating on top of a connectionless packet network such as IP, designed to transport PSTN signaling messages over the connectionless packet network, but is capable of broader applications. This memo defines the Management Information Base (MIB) module which describes managed objects for implementation of the SCTP. Open Issues - Remove this section. - Remove Revision History - Decide under which object identifier branch of the SNMP tree, SCTP will be placed (value obtained when submitted to the IETF editor). - The MIB cannot be compiled because new textual convention for Internet Network Address (draft-ops-endpoint-mib-08.txt) is work in progress, not an RFC. - Update references to drafts. - Format draft accoring to the IETF rules. Table of Contents 1. Introduction ................................................ 1.1 Abbreviations .............................................. 2. The SNMP framework .......................................... 3. Structure of the MIB ........................................ 3.1 Protocol General Variables ................................. 3.2 Statistics for Traffic Measurements ........................ 3.2.1 State-Related Statistics ................................. 3.2.2 Other Statistics ......................................... 3.3 Association Tables ......................................... 4. Definitions ................................................. 4.1 Conformance Information .................................... 4.1.1 Compliance Statements .................................... 4.1.2 Units of Conformance ..................................... 5. References .................................................. 6. Security Considerations ..................................... 7. Acknowledgements ............................................ 8. Authors' Addresses .......................................... 9. Revision History ............................................ 1. Introduction This memo defines the Management Information Base (MIB) module which describes managed objects for implementations of the SCTP. The document starts with a brief description of the SNMP framework and continues with the MIB explanation and security consideration among others. The managed objects in this MIB module have been based on RFC 2012: "SNMPv2 Management Information Base for the Transmission Control Protocol using SMIv2" [2]. Terms related to the SCTP architecture are explained in [1]. Other especific abbreviations are listed below. 1.1 Abbreviations MIB - Management Information Base SCTP - Stream Control Transmission Protocol SMI - Structure of Management Information SNMP - Simple Network Management Protocol 2. The SNMP Framework The SNMP Management Framework presently consists of five major components: - An overall architecture, described in RFC 2271 [SNMPArch]. - Mechanisms for describing and naming objects and events for the purpose of management. The first version of this Structure of Management Information (SMI) is called SMIv1 and described in RFC 1155 [SMIv1], RFC 1212 [SNMPv1MIBDef] and RFC 1215 [SNMPv1Traps]. The second version, called SMIv2, is described in RFC 1902 [SMIv2], RFC 1903 [SNMPv2TC] and RFC 1904 [SNMPv2Conf]. - Message protocols for transferring management information. The first version of the SNMP message protocol is called SNMPv1 and described in RFC 1157 [SNMPv1]. A second version of the SNMP message protocol, which is not an Internet standards track protocol, is called SNMPv2c and described in RFC 1901 [SNMPv2c] and RFC 1906 [SNMPv2TM]. The third version of the message protocol is called SNMPv3 and described in RFC 1906 [SNMPv2TM], RFC 2272 [SNMPv3MP] and RFC 2574 [SNMPv3USM]. - Protocol operations for accessing management information. The first set of protocol operations and associated PDU formats is described in RFC 1157 [SNMPv1]. A second set of protocol operations and associated PDU formats is described in RFC 1905 [SNMPv2PO]. - A set of fundamental applications described in RFC 2273 [SNMPv3App] and the view-based access control mechanism described in RFC 2575 [SNMPv3VACM]. Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the mechanisms defined in the SMI. This memo specifies a MIB module that is compliant to the SMIv2. A MIB conforming to the SMIv1 can be produced through the appropriate translations. The resulting translated MIB must be semantically equivalent, except where objects or events are omitted because no translation is possible (use of Counter64). Some machine-readable information in SMIv2 will be converted into textual descriptions in SMIv1 during the translation process. However, this loss of machine-readable information is not considered to change the semantics of the MIB. 3. Structure of the MIB The MIB is structured in the following way: sctpMib / \ sctpObjects sctpConformance / \ sctpScalars sctpTables where the following sections are described : - sctpObjects, where all the SCTP objects are defined under this branch. - sctpScalars, where scalars values are placed. It is divided in: - General variables, where the main SCTP initial variables are listed. - Statistics for traffic measurements. - state related - other statistics - sctpTables, to hold data from each association together with the main statistics (per association or transport address). Local and remote tables are included into the general association table to allow multiples IP addresses in order to support the multihome feature. - sctpConformance, for the Unit of Conformance. 3.1 Scalars 3.1.1 Protocol General Variables The first section of the MIB contains the general variables for the SCTP protocol. Parameters as the RTO related variables, streams, timers and heartbeat are described. Maximum and Minimum values can be found here. SCTP RTO mechanism is the same as defined in TCP. So, the variable is based on the one defined in RFC 2012. In SCTP protocol, only options 'other' and 'vanj' remain because SCTP protocol defines Van Jacobson's algorithm as the one to be used to calculate RTO. 'Other' is left for future use ('rsre' algorithm was eliminated because MIL-STD-1778 is Cancelled-No Superseding Document according to the Military Standard library and 'constant' option doesn't fulfill the SCTP protocol description). Cookies and heartbeat values have been added acording to the SCTP protocol. Timers for initialization and shutdown procedures have been included, so the operator can check them and take the proper actions when required. Since SCTP is based on the transmission through streams, it's interesting to know the maximum number of streams allowed in a given association. The number of used streams will be negotiated at initialization time. 3.1.2 Statistics for traffic Measurements 3.1.2.1 State-Related Statistics These measures are considered important and are also based in the TCP model, but adapted to the SCTP states. They allow to check how easy is to init an association, how many association connection attempts become established associations or how many associations terminate, amongst others. 3.1.2.2 Other Statistics Other statistics are specified based on the data unit of SCTP: the chunk. In this way, we have the whole picture of the bytes flow. Also, there are statistics related to the SCTP packets. I.e., the number of out of the blue packets received by the host (SCTP packets correctly formed, i.e. rigth checksum, whose receiver is not able to identify the association to which this packet belongs). And the number of SCTP packets received with an invalid checksum. 3.2 Association Tables The part of the MIB to define each association is structured according to a expanded table. There is a main table, indexed by the association identification. This main table contains information common for a given association (association id, SCTP user ports, primary address, negotiated number of inbound/outbound streams, retransmited chunks and statistics). This main table (for the association) contains two other tables : a) Table for local IP address/-ess information: This table stores information related to the local IP address/-ess reserved for the association. It's indexed by the IP address/-ess. b) Table for remote IP address/-ess information: This table stores information related to the remote IP address/-ess reserved for the association. It's indexed by the IP addresses. It includes statistics, heartbeat issues, retransmissions counters and the state of the reachibility of the referenced IP address. Note that the IP address indexing the tables is valid for IPv4, IPv6 and DNS [ConvIETF]. Therefore, IP address is defined by the Internet address type and the value of the IP address, according to the Textual Conventions for Internet Network Address. However, DNS value is not being used to identify an IP address since it is only valid during initialization (once init is finished, both sides only use IP addresses). To keep the name of the remote peer, an entry has been created (sctpAssocRemHostName) in the association table. When no DNS name is provided by the remote endpoint at init time, this value will be NULL. Otherwise, the received DNS name will be stored. The variable RowStatus allows creating and deleting rows in the table. Creation will be performed after the four handshake protocol at association start up phase (when the association is considered established). Deletion will be performed when the association is terminated either in a graceful or ungraceful way [ConvSMIv2]. sctpAssocTable +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocId (index) / ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocRemHostName \ ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocLocalSCTPPort / ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocRemSCTPPort \ ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocRemPrimaryAddressType / ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocRemAddressPrimary \ ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocState / ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocInStreams \ ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocOutStreams / ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocT1expired \ ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocT2expired / ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocRtxChunks \ ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocRowStatus / ... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocLocalAddressTable \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocLocalAddressIPType(index)\ ...| \ ... | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocLocalAddressIP (index) \ ...| \ ... | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocLocalAddressRowStatus \ ...| \ ... | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | sctpAssocRemAddressTable \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocRemAddressIPType (index) \ ...| \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocRemAddressIP (index) \ ...| \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocRemAddressStatus \ ...| \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocRemAddressRTO \ ...| \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocRemAddressHeartBeatFlag \ ...| \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocRemAddressRetransCount \ ...| \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocRemAddressPathMaxRx \ ...| \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocRemAddressHBTimer \ ...| \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocRemAddressT3expired \ ...| \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | | | sctpAssocRemAddressRowStatus \ ...| \ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-/+-+-+ / | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Every entry is explained when defining the MIB. 4. Definitions SCTP-MIB DEFINITIONS ::= BEGIN IMPORTS MODULE-IDENTITY, OBJECT-TYPE, INTEGER, Integer32, Unsigned32, Counter32, Counter64, Gauge32, mib-2 FROM SNMPv2-SMI MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF TEXTUAL-CONVENTION, RowStatus, InetAddressType, InetAddress FROM SNMPv2-CONF ; sctpMIB MODULE-IDENTITY LAST-UPDATED "0004300000Z" ORGANIZATION "IETF SIGTRAN Working Group" CONTACT-INFO " Maria-Carmen Belinchon-Vergara Jose-Javier Pastor-Balbas Postal: Ericsson Espana S. A. C/Retama 7 28045 Madrid Spain Phones: +34 91 339 3535 +34 91 339 3819 Emails: Maria.C.Belinchon@ericsson.com J.Javier.Pastor@ericsson.com" DESCRIPTION "The MIB module for managing SCTP implementation." REVISION "00007030000Z" DESCRIPTION "MIB module developed for the SIGTRAN IETF group. Based on SCTPv10" ::= { xxxx } -- IANA needs to choose this value -- when sent to the RFC editor -- Top-level structure of the MIB sctpObjects OBJECT IDENTIFIER ::= { sctpMIB 1 } sctpConformance OBJECT IDENTIFIER ::= { sctpMIB 2 } sctpScalars OBJECT IDENTIFIER ::= { sctpObjects 1 } sctpTables OBJECT IDENTIFIER ::= { sctpObjects 2 } -- PROTOCOL GENERAL VARIABLES -- ************************** sctpRtoAlgorithm OBJECT-TYPE SYNTAX INTEGER { other(1) -- Other new one. Future use vanj(2), -- Van Jacobson's algorithm } MAX-ACCESS read-only STATUS current DESCRIPTION "The algorithm used to determine the timeout value used for retransmitting unacknowledged chunks" ::= { sctpScalars 1 } sctpRtoMin OBJECT-TYPE SYNTAX Unsigned32 UNITS "milliseconds" MAX-ACCESS read-write STATUS current DESCRIPTION "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. Recommended value is 1000 milliseconds". ::= { sctpScalars 2 } sctpRtoMax OBJECT-TYPE SYNTAX Unsigned32 UNITS "milliseconds" MAX-ACCESS read-write STATUS current DESCRIPTION "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". ::= { sctpScalars 3 } sctpRtoInitial OBJECT-TYPE SYNTAX Unsigned32 UNITS "milliseconds" MAX-ACCESS read-write STATUS current DESCRIPTION "Initial value for the Retransmission timer. Recommended value is 3000 milliseconds" ::= { sctpScalars 4 } sctpValCookieLife OBJECT-TYPE SYNTAX Unsigned32 UNITS "milliseconds" MAX-ACCESS read-write STATUS current DESCRIPTION "Valid cookie life in the 4-way start-up handshake procedure. Recommended value: 5000 milliseconds" ::= { sctpScalars 5 } sctpMaxInitRetr OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-write STATUS current DESCRIPTION "The maximum number of retransmissions at the start-up phase. Recommended value: 8 attempts" ::= { sctpScalars 8 } sctpInitialT1 OBJECT-TYPE SYNTAX Unsigned32 UNITS "milliseconds" MAX-ACCESS read-write STATUS current DESCRIPTION "Initial value for the Start-up-T1 timer." ::= { sctpScalars 9 } sctpInitialT2 OBJECT-TYPE SYNTAX Unsigned32 UNITS "milliseconds" MAX-ACCESS read-write STATUS current DESCRIPTION "Initial value for the Shutdown-T2 timer." ::= { sctpScalars 10 } sctpMaxInStreams OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-write STATUS current DESCRIPTION "The maximum number of inbound streams that an SCTP implementation allows. This value will be used to negotiate at start-up phase the outbound streams number." ::= { sctpScalars 11 } sctpMaxAssoc OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-write STATUS current DESCRIPTION "The maximum total number of associations that an SCTP implementation allows including all possible hosts to connect to." ::= { sctpScalars 12 } -- STATE-RELATED STATISTICS sctpCurrEstab OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of SCTP associations for which the current state is either ESTABLISHED or SHUTDOWN-RECEIVED." ::= { sctpScalars 13 } sctpActiveEstab OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of times that SCTP associations have made a direct transition to the ESTABLISH state from the COOKIE-ECHOED state: COOKIE-ECHOED -> ESTABLISHED. This upper layer has been the starter of the communication." ::= { sctpScalars 14 } sctpPassiveEstab OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of times that SCTP associations have made a direct transition to the ESTABLISHED state from the CLOSED state: CLOSED -> ESTABLISHED. This means that the peer has started the dialogue" ::= { sctpScalars 15 } sctpAborted OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of times that SCTP associations have made a direct transition to the CLOSED state from any state using the primitive 'ABORT': AnyState --Abort--> CLOSED." ::= { sctpScalars 16 } sctpShutdowns OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of times that SCTP associations have made a direct transition to the CLOSE state from either the SHUTDOWN- SENT state or the SHUTDOWN-ACK-SENT state." ::= { sctpScalars 17 } -- OTHER LAYER STATISTICS sctpStatAssocOutOfBlue OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of out of the blue packets (SCTP packet correctly formed -rigth checksum- but the receiver is not able to identify the association to which this packet belongs) received by the host." ::= { sctpScalars 18 } sctpStatSentChunks OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of SCTP chunks, control and data chunks, sent to the peers (no retransmissions included)." ::= { sctpScalars 19 } sctpStatRecChunks OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of SCTP chunks, control and data chunks, received from the peers (no retransmissions included)." ::= { sctpScalars 20 } sctpStatRetransChunks OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of SCTP chunks, control and data chunks, retransmited to the peers." ::= { sctpScalars 21 } sctpStatOutOfOrderSentChunks OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of unordered chunks (chunks in which the U bit is set to 1) sent to the peers." ::= { sctpScalars 22 } sctpStatOutOfOrderRecChunks OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of unordered chunks (chunks in which the U bit is set to 1) received from the peers." ::= { sctpScalars 23 } sctpStatChecksumErrorCounter OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of SCTP packets received from the peers with an invalid checksum." ::= { sctpScalars 24 } -- SCTP ASSOCIATION DESCRIPTION PARAMETERS -- *************************************** -- the SCTP Association TABLE -- ************************** -- The SCTP association table contains information about each -- association that the local endpoint has established. sctpAssocTable OBJECT-TYPE SYNTAX SEQUENCE OF SctpAssocEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table containing SCTP association-specific information." ::= { sctpTables 1 } sctpAssocEntry OBJECT-TYPE SYNTAX SctpAssocEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "General common variables and statistics for the whole association" INDEX { sctpAssocId } ::= { sctpAssocTable 1 } SctpAssocEntry ::= SEQUENCE { sctpAssocId Unsigned32, sctpAssocRemHostName OCTECT STRING, sctpAssocLocalSCTPPort Integer32, sctpAssocRemSCTPPort Integer32, sctpAssocRemPrimaryAddressType InetAddressType, sctpAssocRemPrimaryAddress InetAddress, sctpAssocState INTEGER, sctpAssocInStreams Unsigned32, sctpAssocOutStreams Unsigned32, sctpAssocMaxRetr Unsigned32, sctpAssocT1expired Counter32, -- Statistic sctpAssocT2expired Counter32, -- Statistic sctpAssocRtxChunks Counter32, -- Statistic sctpAssocRowStatus RowStatus } sctpAssocId OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS not-accessible STATUS current DESCRIPTION "Association Identification. Value identifying the association (tipically the Initiate Verification Tag)." ::= { sctpAssocEntry 1 } sctpAssocRemHostName OBJECT-TYPE SYNTAX OCTECT STRING (SIZE(0..255)) MAX-ACCESS read-create STATUS current DESCRIPTION "Peer's DNS name. If no DNS domain name was received at init time from the peer, this entry will be meaningless, therefore it will store a NULL value. Otherwise, the remote host name received at init time will be stored." ::= { sctpAssocEntry 2 } sctpAssocLocalSCTPPort OBJECT-TYPE SYNTAX Integer32(0..65535) MAX-ACCESS read-create STATUS current DESCRIPTION "Local Port number used for this association." ::= { sctpAssocEntry 3 } sctpAssocRemSCTPPort OBJECT-TYPE SYNTAX Integer32(0..65535) MAX-ACCESS read-create STATUS current DESCRIPTION "The destination SCTP port number used to communicate with the remote peer for this association. Each value is defined by the IANA organization." ::= { sctpAssocEntry 4 } sctpAssocRemPrimaryAddressType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-create STATUS current DESCRIPTION "Internet type of primary destination IP address. unknown (0) An unknown address type. This value MUST be used if the value of the corresponding InetAddress object is a zero-length string. It may also be used to indicate an IP address which is not one of the formats defined below. This value is used in this MIB for error conditions. ipv4 (1) An IPv4 address as defined by the InetAddressIPv4 textual convention. ipv6 (2) An IPv6 address as defined by the InetAddressIPv6 textual convention." ::= { sctpAssocEntry 5 } sctpAssocRemPrimaryAddress OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "Primary destination IP address. An InetAddress value is always interpreted within the context of an InetAddressType value. This value will be filled in after INIT or INIT ACK messages have been received (when the primary path is selected by SCTP). ::= { sctpAssocEntry 6 } sctpAssocState OBJECT-TYPE SYNTAX INTEGER { closed(1), cookieWait(2), cookieEchoed(3), established(4), shutdownPending(5), shutdownSent(6), shutdownReceived(7), shutdownAckSent(8), deleteTCB(9) } MAX-ACCESS read-only STATUS current DESCRIPTION "The state of this SCTP association. As in TCP, the only value which may be set by a management station is deleteTCB. Accordingly, it is appropriate for an agent to return a 'badValue' response if a management station attempts to set this object to any other value. If a management station sets this object to the value deleteTCB(9), then this has the effect of deleting the TCB (as defined in SCTP) of the corresponding association on the managed node, resulting in immediate termination of the association. As an implementation-specific option, an ABORT chunk may be sent from the managed node to the other SCTP endpoint." ::= { sctpAssocEntry 7 } sctpAssocInStreams OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "Inbound Streams according to the negotiation at association start up. This parameter has to be read-only by the manager. If the local application acts as the server, the sctpAssoc table will be created when the COOKIE chunk arrives, at the same time the association becomes ESTABLISHED. If the local node acts as the client, this table will be created just before sending the INIT chunk. At that time, there is no fixed value for this parameter as the negotiation has not taken part. Initial value is set and modified locally to the negotiated one at the same time the association becomes ESTABLISHED or when the INIT_ACK chunk is received." ::= { sctpAssocEntry 8 } sctpAssocOutStreams OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "Outbound Streams according to the negotiation at association start up. This parameter has to be read-only by the manager. When the local application acts as the server, the sctpAssoc table will be created when the COOKIE chunk arrives, at the same time the association becomes ESTABLISHED. If the local node acts as the client, this table will be created just before sending the INIT chunk. At that time, there is no fixed value for this parameter as the negotiation has not taken part. Initial value is set and modified locally to the negotiated one at the same time the association becomes ESTABLISHED or when the INIT_ACK chunk is received." ::= { sctpAssocEntry 9 } sctpAssocMaxRetr OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-create STATUS current DESCRIPTION "The maximum number of retransmissions for data sending. Recommended value: 10 attempts. This value is specific for each association and the upper layer can be able to change it calling the appropiates primitives." ::= { sctpAssocEntry 10 } -- Association Statistics sctpAssocT1expired OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of times that T1 timer expired (timer for sending INIT message and receiving an acknowledgment)." ::= { sctpAssocEntry 11} sctpAssocT2expired OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of times that T2 timer expired (shutdown timer)." ::= { sctpAssocEntry 12} sctpAssocRtxChunks OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of control and data chunks retransmited to the peer in the current association." ::= { sctpAssocEntry 13} sctpAssocRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "An object that allows entries in this table to be created and deleted using the RowStatus convention. A row in this table will be created after the endpoint sends or receives the COOKIE_ECHOED message, i.e., when the initialization start-up phase is completed (the association is fully established).The creation of this row implies the creation of at least another row (depending on the number of local and remote addresses) in the tables sctpAssocLocalAddressTable and sctpAssocRemAddressTable. A row is deleted in sctpAssocTable when an association turns down. The deletion of a row in sctpAssocTable implies the deletion of the tables related to this asociation (sctpAssocLocalAddressTable and sctpAssocRemAddressTable). Also, a row is deleted in sctpAssocTable when a set operation is received from the manager with destroy option." ::= { sctpAssocEntry 14 } -- Expanded tables: Including Multihome feature -- Local Address TABLE -- ******************* sctpAssocLocalAddressTable OBJECT-TYPE SYNTAX SEQUENCE OF SctpAssocLocalAddressEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Expanded table of sctpAssocTable based on the AssocId index. It shows different interesting data for each local address which takes part in this association." ::= { sctpTables 2 } sctpAssocLocalAddressEntry OBJECT-TYPE SYNTAX SctpAssocLocalAddressEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Local information about the available addresses." INDEX { sctpAssocId, -- shared index sctpAssocLocalAddressIPType, sctpAssocLocalAddressIP } ::= { sctpAssocLocalAddressTable 1 } SctpAssocLocalAddressEntry ::= SEQUENCE { sctpAssocLocalAddressIPType InetAddressType, sctpAssocLocalAddressIP InetAddress, sctpAssocLocalAddressRowStatus RowStatus } sctpAssocLocalAddressIPType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS not-accessible STATUS current DESCRIPTION "The type of a local IP address available for this association. unknown (0) An unknown address type. This value MUST be used if the value of the corresponding InetAddress object is a zero-length string. It may also be used to indicate an IP address which is not one of the formats defined below. This value is used in this MIB for error conditions. ipv4 (1) An IPv4 address as defined by the InetAddressIPv4 textual convention. ipv6 (2) An IPv6 address as defined by the InetAddressIPv6 textual convention." ::= { sctpAssocLocalAddressEntry 1 } sctpAssocLocalAddressIP OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS not-accessible STATUS current DESCRIPTION "The value of a local IP address available for this association. An InetAddress value is always interpreted within the context of an InetAddressType value If SCTP are using DNS names, the mapping to IP address/-ess will be done at reception of INIT or INIT_ACK messages." ::= { sctpAssocLocalAddressEntry 2 } sctpAssocLocalAddressRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "An object that allows entries in this table to be created and deleted using the RowStatus convention. A row in this table will be created per local IP address to be used in this association. The creation takes part when a new row in the sctpAssocTable is created. A row in this table will be deleted per local IP address used in this association when the corresponding row in sctpAssocTable is deleted." ::= { sctpAssocLocalAddressEntry 3 } -- Remote Addresses TABLE -- ********************** sctpAssocRemAddressTable OBJECT-TYPE SYNTAX SEQUENCE OF SctpAssocRemAddressEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Expanded table of sctpAssocTable based on the AssocId index It shows different interesting data for each remote peer IP address which is used in this association." ::= { sctpTables 3 } sctpAssocRemAddressEntry OBJECT-TYPE SYNTAX SctpAssocRemAddressEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Information about the remote IP address most important variables" INDEX { sctpAssocId, -- shared index sctpAssocRemAddressIPType, sctpAssocRemAddressIP } ::= { sctpAssocRemAddressTable 1 } SctpAssocRemAddressEntry ::= SEQUENCE { sctpAssocRemAddressIPType InetAddressType, sctpAssocRemAddressIP InetAddress, sctpAssocRemAddressStatus INTEGER, sctpAssocRemAddressRTO Unsigned32, sctpAssocRemAddressHeartBeatFlag INTEGER, sctpAssocRemAddressHBTimer Unsigned32, sctpAssocRemAddressRetransCount Counter64, sctpAssocRemAddressMaxPathRetrans Counter64, sctpAssocRemAddressRowStatus RowStatus } sctpAssocRemAddressIPType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS not-accessible STATUS current DESCRIPTION "The type of a remote IP address available for this association. unknown (0) An unknown address type. This value MUST be used if the value of the corresponding InetAddress object is a zero-length string. It may also be used to indicate an IP address which is not one of the formats defined below. This value is used in this MIB for error conditions. ipv4 (1) An IPv4 address as defined by the InetAddressIPv4 textual convention. ipv6 (2) An IPv6 address as defined by the InetAddressIPv6 textual convention." ::= { sctpAssocRemAddressEntry 1 } sctpAssocRemAddressIP OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS not-accessible STATUS current DESCRIPTION "The value of a remote IP address available for this association. An InetAddress value is always interpreted within the context of an InetAddressType value." ::= { sctpAssocRemAddressEntry 2 } sctpAssocRemAddressStatus OBJECT-TYPE SYNTAX INTEGER { active(0), inactive(1) } MAX-ACCESS read-only STATUS current DESCRIPTION "The current status of the remote transport address. Active means that the threshold of no anwer received from this IP address has not been reached. Inactive means that either no heartbeat was received from this address, or any other message, reaching the threshold defined by the protocol." ::= { sctpAssocRemAddressEntry 3 } sctpAssocRemAddressRTO OBJECT-TYPE -- T3-Rtx Timer SYNTAX Unsigned32 UNITS "milliseconds" MAX-ACCESS read-only STATUS current DESCRIPTION "The current Retransmision Time-Out. Timer T3 as defined in the protocol SCTP." ::= { sctpAssocRemAddressEntry 4 } sctpAssocRemAddressHeartBeatFlag OBJECT-TYPE SYNTAX INTEGER { active(0), inactive(1) } MAX-ACCESS read-write STATUS current DESCRIPTION "The optional Heartbeat associated to one destination transport address could be actived or not (value equal to 1 or 0, respectively). An active destination transport address is is a transport address on a peer endpoint which a transmitting endpoint considers available for receiving user messages, as it is described in [sctp]." ::= { sctpAssocRemAddressEntry 5 } sctpAssocRemAddressHBTimer OBJECT-TYPE SYNTAX Unsigned32 UNITS "milliseconds" MAX-ACCESS read-only STATUS current DESCRIPTION "The current heartbeat time-out. The initial default value is RTO. It may be change by the user in a per address basis." ::= { sctpAssocRemAddressEntry 6 } -- Remote Address Statistics sctpAssocRemAddressRetransCount OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-write STATUS current DESCRIPTION "Number of retransmissions as defined in [sctp]." ::= { sctpAssocRemAddressEntry 7 } sctpAssocRemAddressMaxPathRetrans OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-write STATUS current DESCRIPTION "Maximum number of retransmissions allowed to a remote IP address before it is considered inactive, as defined in [sctp]." ::= { sctpAssocRemAddressEntry 8 } sctpAssocRemAddressRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "An object that allows entries in this table to be created and deleted using the RowStatus conventionn. A row in this table will be created per remote IP address defined for the association when a row in sctpAssocTable is created. A row in this table will be deleted per remote IP address defined for the association when a row in sctpAssocTable is deleted." ::= { sctpAssocRemAddressEntry 9 } -- 4.1 Conformance Information sctpMIBGroups OBJECT IDENTIFIER ::= { sctpMIBConformance 1 } sctpMIBCompliances OBJECT IDENTIFIER ::= { sctpMIBConformance 2 } -- 4.1.1 Compliance Statements sctpMIBCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for SNMPv3 entities which implement SCTP." MODULE -- this module MANDATORY-GROUPS { sctpGeneralVariablesGroup sctpAssocTablesVariablesGroup } GROUP sctpStateStatGroup DESCRIPTION "The sctp group of objects to control state changes in the SCTP protocol." GROUP sctpOtherStatGroup DESCRIPTION "The sctp group of objects providing for management of SCTP general statistics." GROUP sctpAssocStatGroup DESCRIPTION "The sctp group of objects to manage SCTP statistics related to the remote endpoint." OBJECT sctpAssocRemPrimaryAddressType OBJECT-TYPE SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "It is only required to have IPv4 and IPv6 addresses to be stored since the use of the host names is limited to first stage, when the association is being established." OBJECT sctpAssocRemPrimaryAddress OBJECT-TYPE SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "It is only required to support OPv4 and globally unique IPv6 addresses." OBJECT sctpAssocLocalAddressIPType OBJECT-TYPE SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "It is only required to have IPv4 and IPv6 addresses to be stored since the use of the host names is limited to first stage, when the association is being established." OBJECT sctpAssocLocalAddressIP OBJECT-TYPE SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "It is only required to support IPv4 and globally unique IPv6 addresses." OBJECT sctpAssocRemAddressIPType OBJECT-TYPE SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "It is only required to have IPv4 and IPv6 addresses to be stored since the use of the host names is limited to first stage, when the association is being established." OBJECT sctpAssocRemAddressIP OBJECT-TYPE SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "It is only required to support IPv4 and globally unique IPv6 addresses." ::= { sctpMIBCompliances 1 } -- 4.1.2 Units of conformance sctpGeneralVariablesGroup OBJECT-GROUP OBJECTS { sctpRtoAlgorithm, sctpRtoMin, sctpRtoMax, sctpRtoInitial, sctpValCookieLife, sctpMaxInitRetr, sctpInitialT1, sctpInitialT2, sctpMaxInStreams, sctpMaxAssoc } STATUS current DESCRIPTION "The sctp group of objects providing for management of SCTP entities. Common parameters for the protocol." ::= { sctpMIBGroups 1 } sctpStateStatGroup OBJECT-GROUP OBJECTS { sctpCurrEstab, sctpActiveEstab, sctpPassiveEstab, sctpAborted, sctpShutdowns } STATUS current DESCRIPTION "The sctp group of objects to control state changes in the SCTP protocol." ::= { sctpMIBGroups 2 } sctpOtherStatGroup OBJECT-GROUP OBJECTS { sctpAssocOutOfBlue, sctpStatSentChunks, sctpStatRecChunks, sctpStatRetransChunks, sctpStatOutOfOrderSentChunks, sctpStatOutOfOrderRecChunks,sctpStatChecksumErrorCounter} STATUS current DESCRIPTION "The sctp group of objects providing for management of SCTP general statistics." ::= { sctpMIBGroups 3 } sctpAssocTablesVariablesGroup OBJECT-GROUP OBJECTS { sctpAssocId, sctpAssocRemHostName, sctpAssocLocalSCTPPort, sctpAssocRemSCTPPort, sctpAssocRemPrimaryAddressType, sctpAssocRemPrimaryAddress, sctpAssocState, sctpAssocInStreams, sctpAssocOutStreams, sctpAssocMaxRetr,sctpAssocT1expired, sctpAssocT2expired, sctpAssocRtxChunks, sctpAssocRowStatus, sctpAssocLocalAddressIPType,sctpAssocLocalAddressIP, sctpAssocLocalAddressRowStatus, sctpAssocRemAddressIPType, sctpAssocRemAddressIP, sctpAssocRemAddressStatus, sctpAssocRemAddressRTO, sctpAssocRemAddressHeartBeatFlag, sctpAssocRemAddressHBTimer, sctpAssocRemAddressRowStatus, } STATUS current DESCRIPTION "The sctp group of objects to manage specific local and remote SCTP variables (local and remote tables)." ::= { sctpMIBGroups 4 } sctpAssocStatGroup OBJECT-GROUP OBJECTS { sctpAssocRemAddressRetransCount, sctpAssocRemAddressMaxPathRetrans, } STATUS current DESCRIPTION "The sctp group of objects to manage SCTP statistics related to the remote endpoint." ::= { sctpMIBGroups 5 } END 5. References [sctp] R. Stewart, Q. Xie, K. Morneault, C. Sharp, H. J. Schwarzbauer, T. Taylor, I. Rytina, M. Kalla, L. Zhang, V. Paxson, "Stream Control Transmission Protocol", Internet Draft, February 2000. [ConvIETF] Textual Conventions for Internet Network Addresses , Internet Draft , April 2000. [MIBMPLS] Cucchiara et al. "Definnitions of Managed Objects for the Multiprotocol Label Switching, Label Distribution Protocol (LDP)", Internet Draf <draft-ietf-mpls-ldp-mib-04.txt>, January 2000. [SecSNMP] Stallings, W., "SNMP3: A Security Enhancement for SNMP", IEEE Communication Surveys, Forth quarter 1998, Vol. 1 No. 1. [Cong] Jacobson, V., "Congestion Avoidance and Control", SIGCOMM 1988, Stanford, California. [RFC2012] K. McCloghrie, "SNMPv2 Management Information Base for the Transmission Control Protocol using SMIv2", RFC 2012, November 1996. [RFC2571] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for Describing SNMP Management Frameworks", RFC 2571, April 1999. [RFC1155] Rose, M., and K. McCloghrie, "Structure and Identification of Management Information for TCP/IP-based Internets", STD 16, RFC 1155, May 1990. [RFC1212] Rose, M., and K. McCloghrie, "Concise MIB Definitions", STD 16, RFC 1212, March 1991. [RFC1215] M. Rose, "A Convention for Defining Traps for use with the SNMP", RFC 1215, March 1991. [RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999. [RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999. [RFC1157] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple Network Management Protocol", STD 15, RFC 1157, May 1990. [RFC1901] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Introduction to Community-based SNMPv2", RFC 1901, January 1996. [RFC1906] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1906, January 1996. [RFC2572] Case, J., Harrington D., Presuhn R., and B. Wijnen, "Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)", RFC 2572, April 1999. [RFC2574] Blumenthal, U., and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", RFC 2574, April 1999. [RFC1905] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1905, January 1996. [RFC2573] Levi, D., Meyer, P., and B. Stewart, "SNMPv3 Applications", RFC 2573, April 1999. [RFC2575] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", RFC 2575, April 1999. [RFC2570] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction to Version 3 of the Internet-standard Network Management Framework", RFC 2570, April 1999. 6. Security Consideration There are a number of management objects defined in this MIB that have a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. It is thus important to control even GET access to these objects and possibly to even encrypt the values of these object when sending them over the network via SNMP. Not all versions of SNMP provide features for such a secure environment. SNMPv1 by itself is not a secure environment. Even if security measures are taken (e.g., using IPSEC), there is no per-user control as to who (once an IPSEC association is established between hosts) is allowed to GET or SET the objects in this MIB It is recommended that the implementers consider the security features as provided by the SNMPv3 framework. Specifically, the use of the User-based Security Model RFC 2574 [RFC2574] and the View-based Access Control Model RFC 2575 [RFC2575] is recommended. It is then a customer/user responsibility to ensure that the SNMP entity giving access to an instance of this MIB, is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them. 7. Acknowledgments The authors wish to thank David Partain for his invaluable comments. 8. Authors' Addresses Javier Pastor Tel: +34-91-339-3819 Ericsson Espana S. A. EMail: J.Javier.Pastor@ericsson.com Network Communication Services Retama 7, 5th floor Madrid, 28045 Spain Maria-Carmen Belinchon Tel: +34-91-339-3535 Ericsson Espana S. A. EMail: Maria.C.Belinchon@ericsson.com Network Communication Services Retama 7, 5th floor Madrid, 28045 Spain 9. Revision History 9.1 Changes from o Open issues updated o Section 2: Reference to RFC227x changed to RFC257x o Section 4: Inside the sctpRtoAlgorithm definition has been put "other" first rather than last. That way, it won't end up in the middle of things when new enumerations are added later. 9.2 Changes from o Change of "Simple" word to "Stream" word in SCTP acronyms o Version of the MIB based on SCTPv10 o Section 2: Update SNMP Framework to include the standard explanation o New Structure for the MIB: sctpMIB \- sctpObjects \- sctpScalars \- sctpTables \- sctpConformance o Section 4.1.2: Unit of Conformance updated (functional structure). o MAX-ACCESS clauses reviewed o The general statistics has been re-ordered, placed before the tables. o In SMIv2, indexes should be not-accessible (= the object type is a column in a table used as index and may not be used as an operand in any operation != SMIv1) (pp109-110 in []) o IPv6 compatible: - Change of Primary/Local/Remote addresses - PENDING: check "MODULE-COMPLIANCE" o Row Status included in AssocTable, AssocLocal and AssocRem to create, modify and delete rows in the tables. o SCTP general statistics changed from Counter32 to Counter64 since it supports more data changes. o sctpCurrEstab ("State-related variables and statistics" section) variable changed from Gauge32 to Counter32. o sctpAssocRemAddressT1expired and sctpAssocRemAddressT2expired have been removed from the remote table and added in the general association data since they are variables per association (not per IP address). o sctpAssocDropDatag statistic has been removed from the general association statistics since it had an ambiguous meaning. o Explained the meaning of the unordered chunks (chunks in which the U bit is set to 1) in sctpStatOutOfOrderSentChunks and sctpStatOutOfOrderRecChunks. o Added sctpChecksumErrorCounter to collect information about wrong checksums received from the peer. o Specify that sctpStatSentChunks and sctpStatRecChunks does not contain retransmission chunks. o Reword the Security Considerations chapter pointing out that IPsec does not secure the network but it provides end-to-end security over a network. o sctpAssocRemAddressRtxChunks replaced as a variable per association, meaning the number of chunks retransmited to the peer in the current association. o sctpHeartBeatMisses and sctpMaxRetr have been replaced from the general SCTP statistics to the remote IP address table (sctpHeartBeatMisses) and in the association table (sctpMaxRetr). o Specify that the retransmissions in the general SCTP statistics include control plus data chunks. o Included heartbeat timer for remote IP address. o Removed sctpAssocRemAddressHeartBeatMisses variable from the remote IP address table. o Removed sctpAssocRemAddressT3expired variable from the remote IP address table. o Updated variables to the new SCTP states defined in v10.