Internet Draft Differentiated Services Configuration MIB November 2003 Internet Engineering Task Force H. Hazewinkel INTERNET-DRAFT I.Net Expires May 2004 D. Partain Ericsson November 2003 The Differentiated Services Configuration MIB draft-ietf-snmpconf-diffpolicy-09.txt November 2003 Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. 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. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet- Drafts as reference material or to cite them other than as "work in progress." 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. This document is a product of the IETF's Configuration Management with SNMP Working Group. Comments should be addressed to WG's mailing list at snmpconf@snmp.com. The charter for the Working Group may be found at http://www.ietf.org/html.charters/snmpconf- charter.html Distribution of this memo is unlimited. SNMPCONF WG Expires May 2004 [Page 1] Internet Draft Differentiated Services Configuration MIB November 2003 Copyright Notice Copyright (C) The Internet Society (2003). All Rights Reserved. Abstract This memo describes a MIB module that provides a conceptual layer between high-level "network-wide" policy definitions that effect configuration of the Differentiated Services (diffserv) subsystem and the instance-specific information that would include such details as the parameters for all the queues associated with each interface in a system. This essentially provides an interface for configuring differentiated services at a conceptually higher layer than that of the Differentiated Services MIB. SNMPCONF WG Expires May 2004 [Page 2] Internet Draft Differentiated Services Configuration MIB November 2003 Table of Contents 1 The Internet-Standard Management Framework ................... 4 2 Introduction ................................................. 4 3 Other Documents .............................................. 5 4 Relationship to other MIBs ................................... 5 4.1 The Policy-based Management MIB Module ..................... 5 4.2 The Differentiated Services MIB Module ..................... 5 5 The Differentiated Services Configuration MIB Module Design ........................................................... 6 6 Template Cloning ............................................. 8 6.1 An Approach to Template Cloning ............................ 8 6.2 Example .................................................... 9 6.2.1 The Initial Situation .................................... 11 6.2.2 The Configuration Template ............................... 12 6.2.3 Applying the Template .................................... 14 6.2.4 Applying the Template Using SNMP Messages ................ 17 7 Managed Objects Definitions (MIB Module) ..................... 18 8 Security Considerations ...................................... 25 9 Acknowledgments .............................................. 26 10 Editors' Addresses .......................................... 26 11 Full Copyright Statement .................................... 26 12 Intellectual Property ....................................... 27 13 Informative References ...................................... 28 14 Normative References ........................................ 29 SNMPCONF WG Expires May 2004 [Page 3] Internet Draft Differentiated Services Configuration MIB November 2003 1. The Internet-Standard Management Framework For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of RFC 3410 [RFC3410]. Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP). Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580 [RFC2580]. 2. Introduction This memo defines a MIB module that can be used to convey management information about desired network-wide Differentiated Services based policy behavior. This module is designed to integrate with the Differentiated Services MIB module [RFC3289] in order to provide template configurations for the Differentiated Services MIB module. The MIB module defined in this memo (the DIFFSERV-CONFIG-MIB) may be used in combination with the Policy-based Management MIB module [PMMIBDR], but that is not a requirement. Without the Policy-based Management MIB module, a management application must emulate behavior provided by the Policy-based Management MIB using equivalent "low- level" SNMP operations in normal manager/agent communication. Together, this memo and [RFC3289] and [PMMIBDR] represent an instance of an integrated architecture for both device-specific and network- wide policy (configuration) management which is fully integrated with the Internet Standard Management Framework. The Differentiated Services MIB module [RFC3289] operates on a device level. The MIB module in this memo, the DIFFSERV-CONFIG-MIB, creates a coherent configuration management view as an umbrella over [RFC3289]. That is, the DIFFSERV-CONFIG-MIB provides a conceptual API for configuration of Differentiated Services parameters. Since the Differentiated Services MIB module is able to maintain configuration information, the DIFFSERV-CONFIG-MIB configuration API consists only of configuration template information and the start of the so-called functional datapath. SNMPCONF WG Expires May 2004 [Page 4] Internet Draft Differentiated Services Configuration MIB November 2003 3. Other Documents It is assumed that the reader is familiar with Differentiated Services ([RFC2474] and [RFC2475]), the Policy-based Management MIB ([PMMIBDR]) and "Configuring Networks and Devices With SNMP" ([RFC3512]). These documents include all of the necessary terminology for understanding this memo. Note, though, that use of the MIB module in this memo does not require the use of [PMMIBDR]. [RFC3512] also provides an example MIB module which may help in understanding the relationship between DIFFSERV-CONFIG-MIB and the Differentiated Services MIB in [RFC3289]. 4. Relationship to other MIBs In this section we describe the relationship of this MIB module to other MIB modules. The overall architecture used for policy configuration management is described in [PMMIBDR]. 4.1. The Policy-based Management MIB Module [PMMIBDR] defines a MIB module that enables policy-based configuration management of infrastructure using the Internet Standard Management Framework. The document includes a table for configuring policies to be implemented, tables for storing the roles of elements on a particular device, a table for representing the capabilities of a device with respect to policy management, a table for referencing elements affected by a policy, as well as other infrastructure. There is no requirement that [PMMIBDR] be used in conjunction with the MIB module defined in this memo. See [PMMIBDR] for a full description of the policy-based configuration framework it provides. 4.2. The Differentiated Services MIB Module The Differentiated Services MIB module [RFC3289] provides a common set of managed objects useful for configuring Differentiated Services parameters on a Differentiated Services capable device. This is what is referred to as instance-level configuration. It is the alteration of the instance-level information in that MIB module which may be done via the objects provided by the Differentiated Services Configuration MIB module defined in this memo. SNMPCONF WG Expires May 2004 [Page 5] Internet Draft Differentiated Services Configuration MIB November 2003 It is recognized that vendors may include additional managed objects in their devices (via vendor-specific MIB modules) for configuring Differentiated Services parameters. If a vendor chooses to use the objects defined in this memo for configuration, the vendor should provide additional managed objects in a similar approach as defined for the Differentiated Services MIB module. Since the managed objects of the Differentiated Services MIB [RFC3289] are not directly associated with an instance (interface and interface direction), the same managed objects can be used for traffic treatment configuration templates in a Differentiated Services capable device and can then be applied on multiple instances. Therefore, the tables as defined in the Differentiated Services MIB can directly be used for template configuration purposes. Those tables are: - diffServClfrTable - diffServClfrElementTable - diffServMultiFieldClfrTable - diffServMeterTable - diffServTBParamTable - diffServActionTable - diffServDscpMarkActTable - diffServCountActTable - diffServAlgDropTable - diffServRandomDropTable - diffServQTable - diffServSchedulerTable - diffServMinRateTable - diffServMaxRateTable Readers familiar with the Differentiated Services MIB will notice that these are all templates. Only the diffServDataPathTable defines a managed instance for Differentiated Services traffic treatment by its indexes of the interface and its interface direction. This also allows the tables mentioned above to be used as a configuration template without defining anything directly related to a managed instance. 5. The Differentiated Services Configuration MIB Module Design The Differentiated Services Configuration MIB module (in this memo) of the SNMP-based configuration management framework is positioned between the Policy-based Management MIB module and the instance- SNMPCONF WG Expires May 2004 [Page 6] Internet Draft Differentiated Services Configuration MIB November 2003 specific Differentiated Services MIB module as described above. The MIB module found in this memo is designed to maintain configuration templates for the Differentiated Services MIB [RFC3289] module. The module only has a template table that describes a Differentiated Services traffic treatment by providing the starting pointer of the functional datapath. The templates represent a specific configuration of traffic treatment in a functional datapath of a Differentiated Services capable device. To avoid duplication of managed objects, the actual templates defining the functional datapath are defined in the Differentiated Services MIB module. These are also used for the management of the instances. Therefore, the implementation of the DIFFSERV-CONFIG-MIB module uses the tables defined in the Differentiated Services MIB. As soon as a configuration is made active via the POLICY-MANAGEMENT-MIB or using normal SNMP operations, the configuration defined within this MIB module will be instantiated in the DIFFSERV-MIB. Note that this is a conceptual process. That is, the configuration may not actually go through an API available in the subsystem which implements the DIFFSERV-MIB module. However, configuration via the DIFFSERV-CONFIG-MIB module will alter the same instrumentation as the DIFFSERV-MIB module whether it does it via the DIFFSERV-MIB module or not. The Differentiated Services Configuration MIB module only needs to define a starting point of a traffic treatment configuration template. This table is similar to the diffServDataPathTable [RFC3289]. However, it has a semantic difference in that the diffServDataPathTable is associated with an instance (interface and interface direction), whereas the diffServConfigTable in this memo is not. Unlike most MIB modules, changes to the managed objects in this MIB module do not cause a change in the external/traffic behavior of the device. This MIB module is used to set up per-hop-behavior configurations. As soon as configurations are made active via the POLICY-MANAGEMENT-MIB or SNMP operations, the configurations defined within this MIB module will be instantiated in the DIFFSERV-MIB. The only table in this MIB module is the diffServConfigTable, which provides managed objects for registering traffic treatment configurations used in differentiated services. The sole purpose of this table is to provide the starting point for a traffic treatment configuration template. The traffic treatment itself is performed by SNMPCONF WG Expires May 2004 [Page 7] Internet Draft Differentiated Services Configuration MIB November 2003 functional datapath elements [RFC3289]. 6. Template Cloning The concept of the DIFFSERV-CONFIG-MIB is based on having traffic treatment configuration templates. The templates provide a set of configuration values that provide a particular behavior, such as Expedited Forwarding traffic treatment, in the functional datapath. The template (or functional datapath) is similar to a linked list from a starting point and each (functional datapath) element is connected to the next element via a so-called the element. The moment a template is activated (instantiated) on an interface and its interface direction, the template needs to be copied/cloned, so that the template remains as a template. Note that the template is logically "locked" through the cloning process. That is, the template cannot be changed part way through the cloning process. With the exception of the indices, the cloned template will be identical to the source template. A literal copy/clone of the template would not be possible, since the same indexes inside the element tables cannot be re-used. The instantiation process must therefore generate a new index for each element. As a result of this, the 'NEXT' pointers also need to be updated. Otherwise, those will point to the template. 6.1. An Approach to Template Cloning What should a system containing Differentiated Services capabilities and Differentiated Services configuration capabilities do conceptually at the moment a template is activated on an interface? The following approach should not be considered implementation guidelines, but rather a conceptual explanation of what should be done. 1) Get the index of the template to be activated 2) Get RowPointer (current) from diffServConfigStart.index of the diffServConfigTable 3) Check if RowPointer (current) exists 4) Logically "lock" the entry pointed to by RowPointer so that its values are not changed part way through the cloning process. SNMPCONF WG Expires May 2004 [Page 8] Internet Draft Differentiated Services Configuration MIB November 2003 5) Copy/Clone the entry pointed to by RowPointer a) Get a new index for the entry b) Configure the new entry with the values of the entry to be cloned c) Update the NEXT pointer with a new RowPointer that pointed to the previous entry that was copied part of this template 6) Store RowPointer of cloned entry as previous 7) Get the RowPointer of the next element in the template as current 8) If current RowPointer does not equal zeroDotZero go to 4 9) "Unlock" the entry pointed to by RowPointer If a configuration/template is activated via a means other than a direct SNMP SET request, such as via the Policy-based Management MIB, the handling of the activation and potential error response code must be provided via that mechanism. If a configuration/template is activated using SNMP SET requests, an accurate error response value must be returned. For example, if a configuration/template has inconsistent values, the SNMP SET should return an the configuration is already finished is not of direct influence, since the SNMP SET response must be accurate. On systems where the activation may take a long time, a response may be given prior to completion, but extra mechanisms must be provided to detect any errors. 6.2. Example This section provides an example of the process described in the previous section. This example will show a Differentiated Services capable incoming (ingress) interface that only counts the traffic stream. Then, with the policy-based configuration concept as defined in this document and in [PMMIBDR], a traffic marking configuration will be applied. The example will walk the reader through all of the steps involved in this process. Again, the use of [PMMIBDR] is simply as an example and is not required. NOTE WELL: For brevity and clarity, the example does not always show the complete entry (row) of a table. The only objects shown are those needed for creating the row pointers to the next functional datapath element or needed to provide information about the specific parameters of the functional datapath elements. The column named 'INDEX' always defines the complete index as defined for the associated entry. In some cases this is a combined index SNMPCONF WG Expires May 2004 [Page 9] Internet Draft Differentiated Services Configuration MIB November 2003 of multiple components. Therefore, the names of the columns are omitted. Also note that the values Assured Forwarding and Expedited Forwarding are abstracted as DSCP(AF) and DSCP(EF) (respectively) or simply as AF and EF. For the actual values refer to [RFC3289]. SNMPCONF WG Expires May 2004 [Page 10] Internet Draft Differentiated Services Configuration MIB November 2003 6.2.1. The Initial Situation The initial configuration is the existing configuration of an ingress interface. +------------------------------------------------------------+ | ingress functional datapath | | +----------+ | -->|----------->----------->| count |----------->----------->|--> | +----------+ | +------------------------------------------------------------+ This figure depicts a simple traffic treatment functional datapath for an ingress interface. The functional datapath only consists of a count action. Within the DIFFSERV-MIB this would be instantiated as follows. Note that RowPointer objects must point to the first accessible columnar object in the conceptual row. Thus, while perhaps more instructive to use the index value for the RowPointer object's value (e.g., diffServCountActId.1) in the example, it would nonetheless be incorrect, and the first accessible columnar object has been used as should be done (e.g., diffServCountActOctets.1). diffServDataPathTable +-----------------+-----------------------------+-- | INDEX | diffServDataPathStart | +-----------------+-----------------------------+-- | ifIndex.ingress | diffServActionNext.1 | +-----------------+-----------------------------+-- diffServActionTable +-------+--------------------+-------------------------+-- | INDEX | diffServActionNext |diffServActionSpecific | +-------+--------------------+-------------------------+-- | 1 | 0.0 |diffServCountActOctets.1 | +-------+--------------------+-------------------------+-- diffServCountActTable +-------+------------------------+-- | INDEX | diffServCountActOctets | +-------+------------------------+-- | 1 | | +-------+------------------------+-- SNMPCONF WG Expires May 2004 [Page 11] Internet Draft Differentiated Services Configuration MIB November 2003 6.2.2. The Configuration Template The following provides an example of a policy configuration in which traffic is classified by a specific IP filter. That results in two classifiers (1 for the IP filter and the match all). Both streams are then metered, marked and counted. This is an example of usage on the edge (an ingress interface) of a Differentiated Services domain that wants to have Expedited Forwarding and Assured Forwarding marked traffic within the Differentiated Services domain. +------------------------------------------------------------+ | ingress functional datapath | | +------------+ +-------+ +---------+ +---------+ | | | | | | | action: | | action: | | -->|-->| classifier |-->| meter |-->| mark EF |-->| count |-->|-----> | | match | | | | | | | | | +------------+ +-------+ +---------+ +---------+ | | | \ | | | \ +---------+ | | | \ | action: | |routing | | * -->| dropper | |core | | / | | | | | / +---------+ | | V / | | +------------+ +-------+ +---------+ +---------+ | | | | | | | action: | | action: | | | | classifier |-->| meter |-->| mark AF |-->| count |-->|-----> | | match all | | | | | | | | | +------------+ +-------+ +---------+ +---------+ | +------------------------------------------------------------+ This figure depicts a policy configuration for ingress traffic treatment in a Differentiated Services capable device. The configuration is represented as follows in DIFFSERV-CONFIG-MIB module and the DIFFSERV-MIB module. Note that the original (existing) traffic treatment of 1) is also in the tables of section 6.2.1. Note also that in the diffServDscpMarkActTable that DSCP(EF) represents the DSCP value for Expedited Forwarding and DSCP(AF) represents the DSCP value for Assured Forwarding. SNMPCONF WG Expires May 2004 [Page 12] Internet Draft Differentiated Services Configuration MIB November 2003 diffServConfigTable (in the MIB module in this memo) +-------+-------------------------+---------------------------+-- | INDEX | diffServConfigStart | diffServConfigDescr | +-------+-------------------------+---------------------------+-- | "foo" | diffServClfrStorage.1 | Example traffic treatment | +-------+-------------------------+---------------------------+-- diffServClfrTable +-------+---------------------+--------------------+ | INDEX | diffServClfrStorage | diffServClfrStatus | +-------+---------------------+--------------------+ | 1 | | | +-------+---------------------+--------------------+ diffServClfrElementTable (shares index with diffServClfrTable) +-------+---------------------------+-------------------------------+-- | INDEX | diffServClfrElementNext | diffServClfrElementPrecedence | +-------+---------------------------+-------------------------------+-- | 1.1 |diffServMeterSucceedNext.1 | 1 | | 1.2 |diffServMeterSucceedNext.2 | 2 | +-------+---------------------------+-------------------------------+-- diffServMeterTable +-------+--------------------------+-----------------------+-- | INDEX | diffServMeterSucceedNext |diffServMeterFailNext | +-------+--------------------------+-----------------------+-- | 1 | diffServActionNext.2 | diffServAlgDropType.1 | | 2 | diffServActionNext.3 | diffServAlgDropType.1 | +-------+--------------------------+-----------------------+-- diffServActionTable +-------+----------------------+----------------------------+-- | INDEX | diffServActionNext | diffServActionSpecific | +-------+----------------------+----------------------------+-- | 1 | 0.0 | diffServCountActOctets.1 | | 2 | diffServActionNext.4 | diffServDscpMarkActDscp.EF | | 3 | diffServActionNext.5 | diffServDscpMarkActDscp.AF | | 4 | 0.0 | diffServCountActOctets.2 | | 5 | 0.0 | diffServCountActOctets.3 | +-------+----------------------+----------------------------+-- SNMPCONF WG Expires May 2004 [Page 13] Internet Draft Differentiated Services Configuration MIB November 2003 diffServCountActTable +-------+------------------------+-- | INDEX | diffServCountActOctets | +-------+------------------------+-- | 1 | | | 2 | | | 3 | | +-------+------------------------+-- diffServAlgDropTable +-------+---------------------+-------------------------+-- | INDEX | diffServAlgDropType | diffServAlgDropSpecific | +-------+---------------------+-------------------------+-- | 1 | alwaysDrop(5) | 0.0 | +-------+---------------------+-------------------------+-- diffServDscpMarkActTable +-------------------------+ | diffServDscpMarkActDscp | +-------------------------+ | DSCP(EF) | | DSCP(AF) | +-------------------------+ 6.2.3. Applying the Template Now we have the original ingress interface configuration and the policy configuration we want to apply to the actual interface. The example policy must provide to all interfaces used by system administrators the required Differentiated Services traffic treatment. The traffic treatment required is described in 6.2.2 above. Therefore, we have the following example policy which is configured via the POLICY-BASED-MANAGEMENT-MIB module (see [PMMIBDR]): if ( roleMatch("Administrator") ) then /* * The $0 gets the "element" returned from the previous * statement. the .1 at the end is the ingress interface * This sets, for example, diffServDataPathStart.3.1 to be * "diffServConfigStart.3.f.o.o" if interface 3 has the role SNMPCONF WG Expires May 2004 [Page 14] Internet Draft Differentiated Services Configuration MIB November 2003 * "Administrator". */ setVar("diffServDataPathStart.$0.1", "diffServConfigStart.3.f.o.o", Oid) For our purposes, we only apply this on the inbound (ingress) direction on the interface. Note that although object descriptors are used in this PolicyScript example, the object identifiers must be used in the running script. For more information on policies and their syntax refer to [PMMIBDR]. The following tables of this section provide the cloned entries in the tables of the DIFFSERV-MIB module. All tables may have columns that contain contents or entry administration objects. Since these do not determine a function datapath that are not added for clarity of the cloning mechanism and space. Note that the original (existing) traffic treatment of 6.2.1 and 6.2.2 are also in the tables. diffServConfigTable +-------+-------------------------+---------------------------+-- | INDEX | diffServConfigStart | diffServConfigDescr | +-------+-------------------------+---------------------------+-- | "foo" | diffServClfrStorage.1 | Example traffic treatment | +-------+-------------------------+---------------------------+-- diffServDataPathTable +-----------------+-----------------------------+-- | INDEX | diffServDataPathStart | +-----------------+-----------------------------+-- | ifIndex.ingress | diffServActionNext.2 | +-----------------+-----------------------------+-- diffServClfrTable +-------+---------------------+--------------------+ | INDEX | diffServClfrStorage | diffServClfrStatus | +-------+---------------------+--------------------+ | 1 | | | | 2 | | | +-------+---------------------+--------------------+ SNMPCONF WG Expires May 2004 [Page 15] Internet Draft Differentiated Services Configuration MIB November 2003 diffServClfrElementTable +-------+----------------------------+-------------------------------+-- | INDEX | diffServClfrElementNext | diffServClfrElementPrecedence | +-------+----------------------------+-------------------------------+-- | 1.1 | diffServMeterSucceedNext.1 | 1 | | 1.2 | diffServMeterSucceedNext.2 | 2 | | 2.3 | diffServMeterSucceedNext.3 | 1 | | 2.4 | diffServMeterSucceedNext.4 | 2 | +-------+----------------------------+-------------------------------+-- diffServMeterTable +-------+--------------------------+-----------------------+-- | INDEX | diffServMeterSucceedNext | diffServMeterFailNext | +-------+--------------------------+-----------------------+-- | 1 | diffServActionNext.2 | diffServAlgDropType.1 | | 2 | diffServActionNext.3 | diffServAlgDropType.1 | | 3 | diffServActionNext.6 | diffServAlgDropType.2 | | 4 | diffServActionNext.7 | diffServAlgDropType.2 | +-------+--------------------------+-----------------------+-- diffServActionTable +-------+----------------------+----------------------------+-- | INDEX | diffServActionNext | diffServActionSpecific | +-------+----------------------+----------------------------+-- | 1 | 0.0 | diffServCountActOctets.1 | | 2 | diffServActionNext.4 | diffServDscpMarkActDscp.EF | | 3 | diffServActionNext.5 | diffServDscpMarkActDscp.AF | | 4 | 0.0 | diffServCountActOctets.2 | | 5 | 0.0 | diffServCountActOctets.3 | | 6 | diffServActionNext.8 | diffServDscpMarkActDscp.EF | | 7 | diffServActionNext.9 | diffServDscpMarkActDscp.AF | | 8 | 0.0 | diffServCountActOctets.4 | | 9 | 0.0 | diffServCountActOctets.5 | +-------+----------------------+----------------------------+-- diffServCountActTable +-------+------------------------+-- | INDEX | diffServActCountOctets | +-------+------------------------+-- | 1 | | | 2 | | | 3 | | | 4 | | | 5 | | +-------+------------------------+-- SNMPCONF WG Expires May 2004 [Page 16] Internet Draft Differentiated Services Configuration MIB November 2003 diffServAlgDropTable +-------+---------------------+-------------------------+-- | INDEX | diffServAlgDropType | diffServAlgDropSpecific | +-------+---------------------+-------------------------+-- | 1 | alwaysDrop(5) | 0.0 | +-------+---------------------+-------------------------+-- diffServDscpMarkActTable +-------------------------+ | diffServDscpMarkActDscp | +-------------------------+ | DSCP(EF) | | DSCP(AF) | +-------------------------+ As one can see in the example, the main elements from which a functional datapath are constructed are duplicated/copied/cloned. That process is needed in order to preserve the policy configuration for reuse at a later time. It is up to the SNMP agent to keep track of which network interfaces are under policy control and which policy rules are being used. This avoids duplication of policy enforcement. How the agent does this is an implementation issue. One can see that the old functional datapath configurations stay in the MIB module tables. It is up to the SNMP agent implementation to decide whether to delete stale entries or keep them. Garbage collection of stale entries is an implementation issue. 6.2.4. Applying the Template Using SNMP Messages In this section the above example is explained by using SNMP communication between the SNMP "manager" and the SNMP "agent". In order to apply the the template to all interfaces that have a role match of "Administrator" the SNMP manager must have a list of the roles of the interface. This means the SNMP manager must do an SNMP- SET for all those interfaces. This is expressed in the following pseudo code function. set_template_if_administrator_interface( SNMPCONF WG Expires May 2004 [Page 17] Internet Draft Differentiated Services Configuration MIB November 2003 , ) { template_oid = SNMP-GET("diffServConfigStart."); foreach interface () { if (interface.role == "Administrator") { SNMP-SET("diffServDataPathStart.$interface.1", Oid, template_oid); } } } For example, on a system with 3 interfaces, the following list would be known to the manager. The first value indicates the interface number (ifIndex) and the second value is its role. interface_list IF_LIST = { { 1, ... , "Administrator", ... }, { 2, ... , "User", ... }, { 3, ... , "Administrator", ... } } This will result in the communication between a manager and agent of 1 SNMP-GET and 2 SNMP-SETs: - SNMP-GET("diffServConfigStart.3.f.o.o") - SNMP-SET("diffServDataPathStart.1.1", Oid, "diffServActionNext.1") - SNMP-SET("diffServDataPathStart.3.1", Oid, "diffServActionNext.1") 7. Managed Objects Definitions (MIB Module) DIFFSERV-CONFIG-MIB DEFINITIONS ::= BEGIN IMPORTS OBJECT-TYPE, MODULE-IDENTITY, zeroDotZero, mib-2 FROM SNMPv2-SMI RowStatus, StorageType, RowPointer, DateAndTime FROM SNMPv2-TC MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF SnmpAdminString FROM SNMP-FRAMEWORK-MIB; diffServConfigMib MODULE-IDENTITY SNMPCONF WG Expires May 2004 [Page 18] Internet Draft Differentiated Services Configuration MIB November 2003 LAST-UPDATED "200311240000Z" -- 24 November 2003 ORGANIZATION "SNMPCONF WG" CONTACT-INFO "SNMPCONF Working Group http://www.ietf.org/html.charters/snmpconf-charter.html WG mailing list: snmpconf@snmp.com Editors: Harrie Hazewinkel I.Net v. Darwin, 85 20019 - Settimo Milanese (MI), Italy EMail: harrie@inet.it David Partain Ericsson AB P.O. Box 1248 SE-581 12 Linkoping Sweden E-mail: David.Partain@ericsson.com" DESCRIPTION "This MIB module contains differentiated services specific managed objects to perform higher-level configuration management. This MIB allows policies to use 'templates' to instantiate Differentiated Services functional datapath configurations to be assigned (associated with an interface and direction) when a policy is activated. Copyright (C) The Internet Society (2003). This version of this MIB module is part of RFC yyyy; see the RFC itself for full legal notices." -- RFC Ed.: replace yyyy with actual RFC number & remove this note REVISION "200311240000Z" -- 24 November 2003 DESCRIPTION "Initial version publish as RFC yyyy" -- RFC Ed.: replace yyyy with actual RFC number & remove this note ::= { mib-2 xxx } -- RFC Ed.: replace xxx with IANA-assigned number & remove this note diffServConfigMIBObjects OBJECT IDENTIFIER ::= { diffServConfigMib 1 } diffServConfigMIBConformance OBJECT IDENTIFIER ::= { diffServConfigMib 2 } -- -- The Differentiated Services configuration objects SNMPCONF WG Expires May 2004 [Page 19] Internet Draft Differentiated Services Configuration MIB November 2003 -- diffServConfigTable OBJECT-TYPE SYNTAX SEQUENCE OF DiffServConfigEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table which defines the various per-hop-behaviors for which the system has default 'templates'." ::= { diffServConfigMIBObjects 2 } diffServConfigEntry OBJECT-TYPE SYNTAX DiffServConfigEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry defining a per-hop-behavior. Each entry in this table combines the various parameters (entries) into a specific per-hop-behavior. Entries in this table might be defined by a vendor (pre-configured) or defined by a management application." INDEX { diffServConfigId } ::= { diffServConfigTable 1 } DiffServConfigEntry ::= SEQUENCE { diffServConfigId SnmpAdminString, diffServConfigDescr SnmpAdminString, diffServConfigOwner SnmpAdminString, diffServConfigLastChange DateAndTime, diffServConfigStart RowPointer, diffServConfigStorage StorageType, diffServConfigStatus RowStatus } diffServConfigId OBJECT-TYPE SYNTAX SnmpAdminString (SIZE(1..116)) MAX-ACCESS not-accessible STATUS current DESCRIPTION "A unique id for the per-hop-behavior policy for at least the SNMP agent. For ease of administration the value may be unique within an administrative domain, but this is not required. The range of up to 116 octets is chosen to stay within SNMPCONF WG Expires May 2004 [Page 20] Internet Draft Differentiated Services Configuration MIB November 2003 the SMI limit of 128 sub-identifiers in an object identifier." ::= { diffServConfigEntry 1 } diffServConfigDescr OBJECT-TYPE SYNTAX SnmpAdminString MAX-ACCESS read-create STATUS current DESCRIPTION "A human-readable description to identify this defined per-hop-behavior. Note that this is an SnmpAdminString, which permits UTF-8 strings. An administratively assigned identifier for a template that would be unique within an administrative domain. It is up to the management applications to agree how these are assigned within the administrative domain. Once a description, such as 'EF' is assigned, that has a certain set of parameters that achieve 'EF' from box to box, so management application code or Script code can easily scan the table to find the proper template and then easily assign it." ::= { diffServConfigEntry 2 } diffServConfigOwner OBJECT-TYPE SYNTAX SnmpAdminString MAX-ACCESS read-create STATUS current DESCRIPTION "The owner who created this entry." ::= { diffServConfigEntry 3 } diffServConfigLastChange OBJECT-TYPE SYNTAX DateAndTime MAX-ACCESS read-only STATUS current DESCRIPTION "The date and time when this entry was last changed." ::= { diffServConfigEntry 4 } diffServConfigStart OBJECT-TYPE SYNTAX RowPointer MAX-ACCESS read-create STATUS current DESCRIPTION "The pointer to a functional datapath configuration template as SNMPCONF WG Expires May 2004 [Page 21] Internet Draft Differentiated Services Configuration MIB November 2003 set up in the DIFFSERV-MIB. This RowPointer should point to an instance of one of: diffServClfrEntry diffServMeterEntry diffServActionEntry diffServAlgDropEntry diffServQEntry A value of zeroDotZero in this attribute indicates no further Diffserv treatment is performed on traffic of this functional datapath. This also means that the template described by this row is not defined. If the row pointed to does not exist, the treatment is as if this attribute contains a value of zeroDotZero." REFERENCE "Differentiated Services MIB module" DEFVAL { zeroDotZero } ::= { diffServConfigEntry 5 } diffServConfigStorage OBJECT-TYPE SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "The type of storage used for this row. Since an entry in this tables serves as a starting point for a configuration, it is recommended that all entries comprising the configuration started by diffServConfigStart follow the storage type of this entry. Otherwise, after agent reboots a configuration may differ. It may very well be that the agent is not capable of detecting such changes and therefore, the management application should verify the correct configuration after a reboot. Rows with a StorageType of 'permanent' do not need to allow write access to any of the columnar objects in that row." DEFVAL { nonVolatile } ::= { diffServConfigEntry 6 } diffServConfigStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current SNMPCONF WG Expires May 2004 [Page 22] Internet Draft Differentiated Services Configuration MIB November 2003 DESCRIPTION "RowStatus object used for creation and deletion of rows in this table. All writable objects in this row may be modified at any time." DEFVAL { notInService } ::= { diffServConfigEntry 7 } -- -- MIB Compliance statements. -- diffServConfigMIBCompliances OBJECT IDENTIFIER ::= { diffServConfigMIBConformance 1 } diffServConfigMIBGroups OBJECT IDENTIFIER ::= { diffServConfigMIBConformance 2 } diffServConfigMIBFullCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "The full compliance for this MIB module. For this compliance level the 'diffServMIBFullCompliance' must be met, since this MIB module depends on it in order to provide the configuration entries. " MODULE -- This module MANDATORY-GROUPS { diffServConfigMIBConfigGroup } OBJECT diffServConfigStatus SYNTAX RowStatus { active(1) } WRITE-SYNTAX RowStatus { createAndGo(4), destroy(6) } DESCRIPTION "Support for createAndWait and notInService is not required." ::= { diffServConfigMIBCompliances 1 } diffServConfigMIBConfigGroup OBJECT-GROUP OBJECTS { diffServConfigDescr, diffServConfigOwner, diffServConfigLastChange, diffServConfigStart, diffServConfigStorage, diffServConfigStatus } STATUS current SNMPCONF WG Expires May 2004 [Page 23] Internet Draft Differentiated Services Configuration MIB November 2003 DESCRIPTION "The per-hop-behavior Group defines the MIB objects that describe the configuration template for the per-hop-behavior." ::= { diffServConfigMIBGroups 1 } END SNMPCONF WG Expires May 2004 [Page 24] Internet Draft Differentiated Services Configuration MIB November 2003 8. Security Considerations There are a number of management objects defined in this MIB module with 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. These managed objects are: - The diffServConfigDescr, diffServConfigOwner and diffServConfigStatus are not security sensitive since these three object do not affect any direct operational behavior of a diffserv capable device. - Unauthorized change of the diffServConfigStart could lead to a different configuration and the 'changed' configuration could lead to different traffic treatment for the diffserv capable device than desired. - Unauthorized change of the diffServConfigStorage could lead to unknown behavior of the diffserv capable device after a reboot of the SNMP agent. This may be caused by 'not having saved changes of the configuration' or unavailable configurations. In addition, the managed objects of the DIFFSERV-MIB are also security sensitive, since unauthorized changes may cause configuration changes. For more detail, refer to [RFC3289]. Allowing read access to objects in this MIB module is generally not considered sensitive, as read access only provides information that a template exists. This is due to the fact that the managed objects that actually instantiate the template are in the DIFFSERV-MIB [RFC3289]. However, in environments where the template description (diffServConfigDescr) or owner (diffServConfigOwner) is considered sensitive information, appropriate access control should be exercised for these objects. SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPSec), there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB module. It is RECOMMENDED that implementers consider the security features as SNMPCONF WG Expires May 2004 [Page 25] Internet Draft Differentiated Services Configuration MIB November 2003 provided by the SNMPv3 framework (see [RFC3410], section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy). Further, deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED. Instead, deployment of SNMPv3 with cryptographic security enabled is RECOMMENDED. It is then a customer/operator responsibility to ensure that the SNMP entity giving access to an instance of this MIB module is properly configured to give access to the objects only to those principals (users) that have legitimate rights to GET or SET (change/create/delete) them. 9. Acknowledgments The editors gratefully acknowledge the significant contributions to this work made by several members of both the SNMPCONF and DiffServ working groups. 10. Editors' Addresses Harrie Hazewinkel I.Net v. Darwin, 85 20019 - Settimo Milanese (MI), Italy EMail: harrie@inet.it David Partain Ericsson AB P.O. Box 1248 SE-581 12 Linkoping Sweden EMail: David.Partain@ericsson.com 11. Full Copyright Statement Copyright (C) The Internet Society (2003). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are SNMPCONF WG Expires May 2004 [Page 26] Internet Draft Differentiated Services Configuration MIB November 2003 included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE." 12. Intellectual Property The IETF takes no position regarding the validity or scope of any intellectual property or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; neither does it represent that it has made any effort to identify any such rights. Information on the IETF's procedures with respect to rights in standards-track and standards-related documentation can be found in BCP-11. Copies of claims of rights made available for publication and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementors or users of this specification can be obtained from the IETF Secretariat. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights which may cover technology that may be required to practice this standard. Please address the information to the IETF Executive Director. SNMPCONF WG Expires May 2004 [Page 27] Internet Draft Differentiated Services Configuration MIB November 2003 13. Informative References [RFC3410] Case, J., Mundy, R., Partain, D. and B. Stewart, "Introduction and Applicability Statements for Internet- Standard Management Framework", RFC 3410, December 2002. [RFC2474] Nichols, K., Blake, S., Baker, F., and D. Black, "Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers", RFC 2474, December 1998. [RFC2475] Blake, S., Black, D., Carlson, M., Davies, E., Wang, Z., and W. Weiss, "An Architecture for Differentiated Services", RFC 2475, December 1998. [RFC3512] MacFaden M., Partain D., Saperia J., and W. Tackabury, "Configuring Networks and Devices with Simple Network Management Protocol (SNMP)," RFC 3512, April 2003. [PMMIBDR] Waldbusser, S., J. Saperia, and T. Hongal, "Policy-based Management MIB", draft-ietf-snmpconf-pm-13.txt, Work in Progress, March 2003. SNMPCONF WG Expires May 2004 [Page 28] Internet Draft Differentiated Services Configuration MIB November 2003 14. Normative References [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. [RFC3289] Baker, F., K. Chan, and A. Smith, "Management Information Base for the Differentiated Services Architecture", RFC 3289, May 2002. [RFC3411] Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture for Describing Simple Network Management Protocol (SNMP) Management Frameworks", STD 62, RFC 3411, December 2002. SNMPCONF WG Expires May 2004 [Page 29]