diff options
Diffstat (limited to 'sdnr/wt/common-yang/ietf-alarms/src/main')
| -rw-r--r-- | sdnr/wt/common-yang/ietf-alarms/src/main/yang/ietf-alarms@2019-09-11.yang | 1526 |
1 files changed, 1526 insertions, 0 deletions
diff --git a/sdnr/wt/common-yang/ietf-alarms/src/main/yang/ietf-alarms@2019-09-11.yang b/sdnr/wt/common-yang/ietf-alarms/src/main/yang/ietf-alarms@2019-09-11.yang new file mode 100644 index 000000000..a1c195faf --- /dev/null +++ b/sdnr/wt/common-yang/ietf-alarms/src/main/yang/ietf-alarms@2019-09-11.yang @@ -0,0 +1,1526 @@ +module ietf-alarms { + yang-version 1.1; + namespace "urn:ietf:params:xml:ns:yang:ietf-alarms"; + prefix al; + + import ietf-yang-types { + prefix yang; + reference + "RFC 6991: Common YANG Data Types."; + } + + organization + "IETF CCAMP Working Group"; + contact + "WG Web: <https://trac.ietf.org/trac/ccamp> + WG List: <mailto:ccamp@ietf.org> + + Editor: Stefan Vallin + <mailto:stefan@wallan.se> + + Editor: Martin Bjorklund + <mailto:mbj@tail-f.com>"; + description + "This module defines an interface for managing alarms. Main + inputs to the module design are the 3GPP Alarm Integration + Reference Point (IRP), ITU-T X.733, and ANSI/ISA-18.2 alarm + standards. + Main features of this module include: + + * Alarm list: + A list of all alarms. Cleared alarms stay in + the list until explicitly purged. + + * Operator actions on alarms: + Acknowledging and closing alarms. + + * Administrative actions on alarms: + Purging alarms from the list according to specific + criteria. + + * Alarm inventory: + A management application can read all + alarm types implemented by the system. + + * Alarm shelving: + Shelving (blocking) alarms according + to specific criteria. + + * Alarm profiles: + A management system can attach further + information to alarm types, for example, + overriding system-default severity + levels. + + This module uses a stateful view on alarms. An alarm is a state + for a specific resource (note that an alarm is not a + notification). An alarm type is a possible alarm state for a + resource. For example, the tuple: + + ('link-alarm', 'GigabitEthernet0/25') + + is an alarm of type 'link-alarm' on the resource + 'GigabitEthernet0/25'. + + Alarm types are identified using YANG identities and an optional + string-based qualifier. The string-based qualifier allows for + dynamic extension of the statically defined alarm types. Alarm + types identify a possible alarm state and not the individual + notifications. For example, the traditional 'link-down' and + 'link-up' notifications are two notifications referring to the + same alarm type 'link-alarm'. + + With this design, there is no ambiguity about how alarm and + alarm clear correlation should be performed; notifications that + report the same resource and alarm type are considered updates + of the same alarm, e.g., clearing an active alarm or changing + the severity of an alarm. The instrumentation can update the + severity and alarm text on an existing alarm. The above alarm + example can therefore look like the following: + + (('link-alarm', 'GigabitEthernet0/25'), + warning, + 'interface down while interface admin state is up') + + There is a clear separation between updates on the alarm from + the underlying resource, like clear, and updates from an + operator, like acknowledging or closing an alarm: + + (('link-alarm', 'GigabitEthernet0/25'), + warning, + 'interface down while interface admin state is up', + cleared, + closed) + + Administrative actions like removing closed alarms older than a + given time is supported. + + This YANG module does not define how the underlying + instrumentation detects and clears the specific alarms. That + belongs to the Standards Development Organization (SDO) or + enterprise that owns that specific technology. + + The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL + NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED', + 'MAY', and 'OPTIONAL' in this document are to be interpreted as + described in BCP 14 (RFC 2119) (RFC 8174) when, and only when, + they appear in all capitals, as shown here. + + Copyright (c) 2019 IETF Trust and the persons identified as + authors of the code. All rights reserved. + + Redistribution and use in source and binary forms, with or + without modification, is permitted pursuant to, and subject to + the license terms contained in, the Simplified BSD License set + forth in Section 4.c of the IETF Trust's Legal Provisions + Relating to IETF Documents + (https://trustee.ietf.org/license-info). + + This version of this YANG module is part of RFC 8632; see + the RFC itself for full legal notices."; + + revision 2019-09-11 { + description + "Initial revision."; + reference + "RFC 8632: A YANG Data Model for Alarm Management"; + } + + /* + * Features + */ + + feature operator-actions { + description + "This feature indicates that the system supports operator + states on alarms."; + } + + feature alarm-shelving { + description + "This feature indicates that the system supports shelving + (blocking) alarms. + + Alarm shelving may have an impact on server processing + resources in order to match alarms against shelf + criteria."; + } + + feature alarm-history { + description + "This feature indicates that the server maintains a history + of state changes for each alarm. For example, if an alarm + toggles between cleared and active 10 times, these state + changes are present in a separate list in the alarm. + + Keeping the alarm history may have an impact on server + memory resources."; + } + + feature alarm-summary { + description + "This feature indicates that the server summarizes the number + of alarms per severity and operator state."; + } + + feature alarm-profile { + description + "The system enables clients to configure further information + to each alarm type."; + } + + feature severity-assignment { + description + "The system supports configurable alarm severity levels."; + reference + "ITU-T Recommendation M.3100: + Generic network information model + ITU-T Recommendation M.3160: + Generic, protocol-neutral management information model"; + } + + feature root-cause-analysis { + description + "The system supports identifying candidate root-cause + resources for an alarm, for example, a disk partition + root cause for a logger failure alarm."; + } + + feature service-impact-analysis { + description + "The system supports identifying candidate-impacted + resources for an alarm, for example, an interface state change + resulting in a link alarm, which can refer to a link as being + impacted."; + } + + feature alarm-correlation { + description + "The system supports correlating/grouping alarms + that belong together."; + } + + /* + * Identities + */ + + identity alarm-type-id { + description + "Base identity for alarm types. A unique identification of + the alarm, not including the resource. Different resources + can share alarm types. If the resource reports the same + alarm type, it is considered to be the same alarm. The alarm + type is a simplification of the different X.733 and 3GPP Alarm + IRP correlation mechanisms, and it allows for + hierarchical extensions. + + A string-based qualifier can be used in addition to the + identity in order to have different alarm types based on + information not known at design time, such as values in + textual SNMP Notification varbinds. + + Standards and vendors can define sub-identities to clearly + identify specific alarm types. + + This identity is abstract and MUST NOT be used for alarms."; + } + + /* + * Common types + */ + + typedef resource { + type union { + type instance-identifier { + require-instance false; + } + type yang:object-identifier; + type string; + type yang:uuid; + } + description + "This is an identification of the alarming resource, such as an + interface. It should be as fine-grained as possible to both + guide the operator and guarantee uniqueness of the alarms. + + If the alarming resource is modeled in YANG, this type will + be an instance-identifier. + + If the resource is an SNMP object, the type will be an + 'object-identifier'. + + If the resource is anything else, for example, a distinguished + name or a Common Information Model (CIM) path, this type will + be a string. + + If the alarming object is identified by a Universally Unique + Identifier (UUID), use the uuid type. Be cautious when using + this type, since a UUID is hard to use for an operator. + + If the server supports several models, the precedence should + be in the order as given in the union definition."; + } + + typedef resource-match { + type union { + type yang:xpath1.0; + type yang:object-identifier; + type string; + } + description + "This type is used to match resources of type 'resource'. + Since the type 'resource' is a union of different types, the + 'resource-match' type is also a union of corresponding types. + + If the type is given as an XPath 1.0 expression, a resource + of type 'instance-identifier' matches if the instance is part + of the node set that is the result of evaluating the XPath 1.0 + expression. For example, the XPath 1.0 expression: + + /ietf-interfaces:interfaces/ietf-interfaces:interface + [ietf-interfaces:type='ianaift:ethernetCsmacd'] + + would match the resource instance-identifier: + + /if:interfaces/if:interface[if:name='eth1'], + + assuming that the interface 'eth1' is of type + 'ianaift:ethernetCsmacd'. + + If the type is given as an object identifier, a resource of + type 'object-identifier' matches if the match object + identifier is a prefix of the resource's object identifier. + For example, the value: + + 1.3.6.1.2.1.2.2 + + would match the resource object identifier: + + 1.3.6.1.2.1.2.2.1.1.5 + + If the type is given as an UUID or a string, it is interpreted + as an XML Schema regular expression, which matches a resource + of type 'yang:uuid' or 'string' if the given regular + expression matches the resource string. + + If the type is given as an XPath expression, it is evaluated + in the following XPath context: + + o The set of namespace declarations is the set of prefix + and namespace pairs for all YANG modules implemented by + the server, where the prefix is the YANG module name and + the namespace is as defined by the 'namespace' statement + in the YANG module. + + If a leaf of this type is encoded in XML, all namespace + declarations in scope on the leaf element are added to + the set of namespace declarations. If a prefix found in + the XML is already present in the set of namespace + declarations, the namespace in the XML is used. + + o The set of variable bindings is empty. + + o The function library is the core function library, and + the functions are defined in Section 10 of RFC 7950. + + o The context node is the root node in the data tree."; + reference + "XML Schema Part 2: Datatypes Second Edition, + World Wide Web Consortium Recommendation + REC-xmlschema-2-20041028"; + } + + typedef alarm-text { + type string; + description + "The string used to inform operators about the alarm. This + MUST contain enough information for an operator to be able to + understand the problem and how to resolve it. If this string + contains structure, this format should be clearly documented + for programs to be able to parse that information."; + } + + typedef severity { + type enumeration { + enum indeterminate { + value 2; + description + "Indicates that the severity level could not be + determined. This level SHOULD be avoided."; + } + enum warning { + value 3; + description + "The 'warning' severity level indicates the detection of a + potential or impending service-affecting fault, before any + significant effects have been felt. Action should be + taken to further diagnose (if necessary) and correct the + problem in order to prevent it from becoming a more + serious service-affecting fault."; + } + enum minor { + value 4; + description + "The 'minor' severity level indicates the existence of a + non-service-affecting fault condition and that corrective + action should be taken in order to prevent a more serious + (for example, service-affecting) fault. Such a severity + can be reported, for example, when the detected alarm + condition is not currently degrading the capacity of the + resource."; + } + enum major { + value 5; + description + "The 'major' severity level indicates that a service- + affecting condition has developed and an urgent corrective + action is required. Such a severity can be reported, for + example, when there is a severe degradation in the + capability of the resource and its full capability must be + restored."; + } + enum critical { + value 6; + description + "The 'critical' severity level indicates that a service- + affecting condition has occurred and an immediate + corrective action is required. Such a severity can be + reported, for example, when a resource becomes totally out + of service and its capability must be restored."; + } + } + description + "The severity level of the alarm. Note well that the value + 'clear' is not included. Whether or not an alarm is cleared + is a separate boolean flag."; + reference + "ITU-T Recommendation X.733: Information Technology + - Open Systems Interconnection + - System Management: Alarm Reporting Function"; + } + + typedef severity-with-clear { + type union { + type enumeration { + enum cleared { + value 1; + description + "The alarm is cleared by the instrumentation."; + } + } + type severity; + } + description + "The severity level of the alarm including clear. This is used + only in notifications reporting state changes for an alarm."; + } + + typedef writable-operator-state { + type enumeration { + enum none { + value 1; + description + "The alarm is not being taken care of."; + } + enum ack { + value 2; + description + "The alarm is being taken care of. Corrective action not + taken yet or has failed"; + } + enum closed { + value 3; + description + "Corrective action taken successfully."; + } + } + description + "Operator states on an alarm. The 'closed' state indicates + that an operator considers the alarm being resolved. This is + separate from the alarm's 'is-cleared' leaf."; + } + + typedef operator-state { + type union { + type writable-operator-state; + type enumeration { + enum shelved { + value 4; + description + "The alarm is shelved. Alarms in /alarms/shelved-alarms/ + MUST be assigned this operator state by the server as + the last entry in the 'operator-state-change' list. The + text for that entry SHOULD include the shelf name."; + } + enum un-shelved { + value 5; + description + "The alarm is moved back to 'alarm-list' from a shelf. + Alarms that are moved from /alarms/shelved-alarms/ to + /alarms/alarm-list MUST be assigned this state by the + server as the last entry in the 'operator-state-change' + list. The text for that entry SHOULD include the shelf + name."; + } + } + } + description + "Operator states on an alarm. The 'closed' state indicates + that an operator considers the alarm being resolved. This is + separate from the alarm's 'is-cleared' leaf."; + } + + /* Alarm type */ + + typedef alarm-type-id { + type identityref { + base alarm-type-id; + } + description + "Identifies an alarm type. The description of the alarm type + id MUST indicate whether or not the alarm type is abstract. + An abstract alarm type is used as a base for other alarm type + ids and will not be used as a value for an alarm or be present + in the alarm inventory."; + } + + typedef alarm-type-qualifier { + type string; + description + "If an alarm type cannot be fully specified at design time by + 'alarm-type-id', this string qualifier is used in addition to + fully define a unique alarm type. + + The definition of alarm qualifiers is considered to be part of + the instrumentation and is out of scope for this module. An + empty string is used when this is part of a key."; + } + + /* + * Groupings + */ + + grouping common-alarm-parameters { + description + "Common parameters for an alarm. + + This grouping is used both in the alarm list and in the + notification representing an alarm-state change."; + leaf resource { + type resource; + mandatory true; + description + "The alarming resource. See also 'alt-resource'. This could + be, for example, a reference to the alarming interface"; + } + leaf alarm-type-id { + type alarm-type-id; + mandatory true; + description + "This leaf and the leaf 'alarm-type-qualifier' together + provide a unique identification of the alarm type."; + } + leaf alarm-type-qualifier { + type alarm-type-qualifier; + description + "This leaf is used when the 'alarm-type-id' leaf cannot + uniquely identify the alarm type. Normally, this is not the + case, and this leaf is the empty string."; + } + leaf-list alt-resource { + type resource; + description + "Used if the alarming resource is available over other + interfaces. This field can contain SNMP OIDs, CIM paths, or + 3GPP distinguished names, for example."; + } + list related-alarm { + if-feature "alarm-correlation"; + key "resource alarm-type-id alarm-type-qualifier"; + description + "References to related alarms. Note that the related alarm + might have been purged from the alarm list."; + leaf resource { + type leafref { + path "/alarms/alarm-list/alarm/resource"; + require-instance false; + } + description + "The alarming resource for the related alarm."; + } + leaf alarm-type-id { + type leafref { + path "/alarms/alarm-list/alarm" + + "[resource=current()/../resource]" + + "/alarm-type-id"; + require-instance false; + } + description + "The alarm type identifier for the related alarm."; + } + leaf alarm-type-qualifier { + type leafref { + path "/alarms/alarm-list/alarm" + + "[resource=current()/../resource]" + + "[alarm-type-id=current()/../alarm-type-id]" + + "/alarm-type-qualifier"; + require-instance false; + } + description + "The alarm qualifier for the related alarm."; + } + } + leaf-list impacted-resource { + if-feature "service-impact-analysis"; + type resource; + description + "Resources that might be affected by this alarm. If the + system creates an alarm on a resource and also has a mapping + to other resources that might be impacted, these resources + can be listed in this leaf-list. In this way, the system + can create one alarm instead of several. For example, if an + interface has an alarm, the 'impacted-resource' can + reference the aggregated port channels."; + } + leaf-list root-cause-resource { + if-feature "root-cause-analysis"; + type resource; + description + "Resources that are candidates for causing the alarm. If the + system has a mechanism to understand the candidate root + causes of an alarm, this leaf-list can be used to list the + root-cause candidate resources. In this way, the system can + create one alarm instead of several. An example might be a + logging system (alarm resource) that fails; the alarm can + reference the file system in the 'root-cause-resource' + leaf-list. Note that the intended use is not to also send + an alarm with the 'root-cause-resource' as an alarming + resource. The 'root-cause-resource' leaf-list is a hint and + should not also generate an alarm for the same problem."; + } + } + + grouping alarm-state-change-parameters { + description + "Parameters for an alarm-state change. + + This grouping is used both in the alarm list's status-change + list and in the notification representing an alarm-state + change."; + leaf time { + type yang:date-and-time; + mandatory true; + description + "The time the status of the alarm changed. The value + represents the time the real alarm-state change appeared in + the resource and not when it was added to the alarm + list. The /alarm-list/alarm/last-changed MUST be set to the + same value."; + } + leaf perceived-severity { + type severity-with-clear; + mandatory true; + description + "The severity of the alarm as defined by X.733. Note that + this may not be the original severity since the alarm may + have changed severity."; + reference + "ITU-T Recommendation X.733: Information Technology + - Open Systems Interconnection + - System Management: Alarm Reporting Function"; + } + leaf alarm-text { + type alarm-text; + mandatory true; + description + "A user-friendly text describing the alarm-state change."; + reference + "ITU-T Recommendation X.733: Information Technology + - Open Systems Interconnection + - System Management: Alarm Reporting Function"; + } + } + + grouping operator-parameters { + description + "This grouping defines parameters that can be changed by an + operator."; + leaf time { + type yang:date-and-time; + mandatory true; + description + "Timestamp for operator action on the alarm."; + } + leaf operator { + type string; + mandatory true; + description + "The name of the operator that has acted on this alarm."; + } + leaf state { + type operator-state; + mandatory true; + description + "The operator's view of the alarm state."; + } + leaf text { + type string; + description + "Additional optional textual information provided by the + operator."; + } + } + + grouping resource-alarm-parameters { + description + "Alarm parameters that originate from the resource view."; + leaf is-cleared { + type boolean; + mandatory true; + description + "Indicates the current clearance state of the alarm. An + alarm might toggle from active alarm to cleared alarm and + back to active again."; + } + leaf last-raised { + type yang:date-and-time; + mandatory true; + description + "An alarm may change severity level and toggle between + active and cleared during its lifetime. This leaf indicates + the last time it was raised ('is-cleared' = 'false')."; + } + leaf last-changed { + type yang:date-and-time; + mandatory true; + description + "A timestamp when the 'status-change' or + 'operator-state-change' list was last changed."; + } + leaf perceived-severity { + type severity; + mandatory true; + description + "The last severity of the alarm. + + If an alarm was raised with severity 'warning' but later + changed to 'major', this leaf will show 'major'."; + } + leaf alarm-text { + type alarm-text; + mandatory true; + description + "The last reported alarm text. This text should contain + information for an operator to be able to understand the + problem and how to resolve it."; + } + list status-change { + if-feature "alarm-history"; + key "time"; + min-elements 1; + description + "A list of status-change events for this alarm. + + The entry with latest timestamp in this list MUST + correspond to the leafs 'is-cleared', 'perceived-severity', + and 'alarm-text' for the alarm. + + This list is ordered according to the timestamps of alarm + state changes. The first item corresponds to the latest + state change. + + The following state changes create an entry in this + list: + - changed severity (warning, minor, major, critical) + - clearance status; this also updates the 'is-cleared' + leaf + - alarm-text update"; + uses alarm-state-change-parameters; + } + } + + grouping filter-input { + description + "Grouping to specify a filter construct on alarm information."; + leaf alarm-clearance-status { + type enumeration { + enum any { + description + "Ignore alarm-clearance status."; + } + enum cleared { + description + "Filter cleared alarms."; + } + enum not-cleared { + description + "Filter not-cleared alarms."; + } + } + mandatory true; + description + "The clearance status of the alarm."; + } + container older-than { + presence "Age specification"; + description + "Matches the 'last-status-change' leaf in the alarm."; + choice age-spec { + description + "Filter using date and time age."; + case seconds { + leaf seconds { + type uint16; + description + "Age expressed in seconds."; + } + } + case minutes { + leaf minutes { + type uint16; + description + "Age expressed in minutes."; + } + } + case hours { + leaf hours { + type uint16; + description + "Age expressed in hours."; + } + } + case days { + leaf days { + type uint16; + description + "Age expressed in days."; + } + } + case weeks { + leaf weeks { + type uint16; + description + "Age expressed in weeks."; + } + } + } + } + container severity { + presence "Severity filter"; + choice sev-spec { + description + "Filter based on severity level."; + leaf below { + type severity; + description + "Severity less than this leaf."; + } + leaf is { + type severity; + description + "Severity level equal to this leaf."; + } + leaf above { + type severity; + description + "Severity level higher than this leaf."; + } + } + description + "Filter based on severity."; + } + container operator-state-filter { + if-feature "operator-actions"; + presence "Operator state filter"; + leaf state { + type operator-state; + description + "Filter on operator state."; + } + leaf user { + type string; + description + "Filter based on which operator."; + } + description + "Filter based on operator state."; + } + } + + /* + * The /alarms data tree + */ + + container alarms { + description + "The top container for this module."; + container control { + description + "Configuration to control the alarm behavior."; + leaf max-alarm-status-changes { + type union { + type uint16; + type enumeration { + enum infinite { + description + "The status-change entries are accumulated + infinitely."; + } + } + } + default "32"; + description + "The 'status-change' entries are kept in a circular list + per alarm. When this number is exceeded, the oldest + status change entry is automatically removed. If the + value is 'infinite', the status-change entries are + accumulated infinitely."; + } + leaf notify-status-changes { + type enumeration { + enum all-state-changes { + description + "Send notifications for all status changes."; + } + enum raise-and-clear { + description + "Send notifications only for raise, clear, and + re-raise. Notifications for severity-level changes or + alarm-text changes are not sent."; + } + enum severity-level { + description + "Only send notifications for alarm-state changes + crossing the level specified in + 'notify-severity-level'. Always send clear + notifications."; + } + } + must '. != "severity-level" or ../notify-severity-level' { + description + "When notify-status-changes is 'severity-level', a value + must be given for 'notify-severity-level'."; + } + default "all-state-changes"; + description + "This leaf controls the notifications sent for alarm status + updates. There are three options: + + 1. Notifications are sent for all updates, severity-level + changes, and alarm-text changes. + + 2. Notifications are only sent for alarm raise and clear. + + 3. Notifications are sent for status changes equal to or + above the specified severity level. Clear + notifications shall always be sent. Notifications + shall also be sent for state changes that make an + alarm less severe than the specified level. + + For example, in option 3, assume that the severity level + is set to major and that the alarm has the following state + changes: + + [(Time, severity, clear)]: + [(T1, major, -), (T2, minor, -), (T3, warning, -), + (T4, minor, -), (T5, major, -), (T6, critical, -), + (T7, major. -), (T8, major, clear)] + + In that case, notifications will be sent at times + T1, T2, T5, T6, T7, and T8."; + } + leaf notify-severity-level { + when '../notify-status-changes = "severity-level"'; + type severity; + description + "Only send notifications for alarm-state changes crossing + the specified level. Always send clear notifications."; + } + container alarm-shelving { + if-feature "alarm-shelving"; + description + "The 'alarm-shelving/shelf' list is used to shelve + (block/filter) alarms. The conditions in the shelf + criteria are logically ANDed. The first matching shelf is + used, and an alarm is shelved only for this first match. + Matching alarms MUST appear in the + /alarms/shelved-alarms/shelved-alarm list, and + non-matching /alarms MUST appear in the + /alarms/alarm-list/alarm list. The server does not send + any notifications for shelved alarms. + + The server MUST maintain states (e.g., severity + changes) for the shelved alarms. + + Alarms that match the criteria shall have an + operator state 'shelved'. When the shelf + configuration removes an alarm from the shelf, the server + shall add the operator state 'un-shelved'."; + list shelf { + key "name"; + ordered-by user; + leaf name { + type string; + description + "An arbitrary name for the alarm shelf."; + } + description + "Each entry defines the criteria for shelving alarms. + Criteria are ANDed. If no criteria are specified, + all alarms will be shelved."; + leaf-list resource { + type resource-match; + description + "Shelve alarms for matching resources."; + } + list alarm-type { + key "alarm-type-id alarm-type-qualifier-match"; + description + "Any alarm matching the combined criteria of + 'alarm-type-id' and 'alarm-type-qualifier-match' + MUST be matched."; + leaf alarm-type-id { + type alarm-type-id; + description + "Shelve all alarms that have an 'alarm-type-id' that + is equal to or derived from the given + 'alarm-type-id'."; + } + leaf alarm-type-qualifier-match { + type string; + description + "An XML Schema regular expression that is used to + match an alarm type qualifier. Shelve all alarms + that match this regular expression for the alarm + type qualifier."; + reference + "XML Schema Part 2: Datatypes Second Edition, + World Wide Web Consortium Recommendation + REC-xmlschema-2-20041028"; + } + } + leaf description { + type string; + description + "An optional textual description of the shelf. This + description should include the reason for shelving + these alarms."; + } + } + } + } + container alarm-inventory { + config false; + description + "The 'alarm-inventory/alarm-type' list contains all possible + alarm types for the system. + + If the system knows for which resources a specific alarm + type can appear, it is also identified in the inventory. + The list also tells if each alarm type has a corresponding + clear state. The inventory shall only contain concrete + alarm types. + + The alarm inventory MUST be updated by the system when new + alarms can appear. This can be the case when installing new + software modules or inserting new card types. A + notification 'alarm-inventory-changed' is sent when the + inventory is changed."; + list alarm-type { + key "alarm-type-id alarm-type-qualifier"; + description + "An entry in this list defines a possible alarm."; + leaf alarm-type-id { + type alarm-type-id; + description + "The statically defined alarm type identifier for this + possible alarm."; + } + leaf alarm-type-qualifier { + type alarm-type-qualifier; + description + "The optionally dynamically defined alarm type identifier + for this possible alarm."; + } + leaf-list resource { + type resource-match; + description + "Optionally, specifies for which resources the alarm type + is valid."; + } + leaf will-clear { + type boolean; + mandatory true; + description + "This leaf tells the operator if the alarm will be + cleared when the correct corrective action has been + taken. Implementations SHOULD strive for detecting the + cleared state for all alarm types. + + If this leaf is 'true', the operator can monitor the + alarm until it becomes cleared after the corrective + action has been taken. + + If this leaf is 'false', the operator needs to validate + that the alarm is no longer active using other + mechanisms. Alarms can lack a corresponding clear due + to missing instrumentation or no logical + corresponding clear state."; + } + leaf-list severity-level { + type severity; + description + "This leaf-list indicates the possible severity levels of + this alarm type. Note well that 'clear' is not part of + the severity type. In general, the severity level + should be defined by the instrumentation based on the + dynamic state, rather than being defined statically by + the alarm type, in order to provide a relevant severity + level based on dynamic state and context. However, most + alarm types have a defined set of possible severity + levels, and this should be provided here."; + } + leaf description { + type string; + mandatory true; + description + "A description of the possible alarm. It SHOULD include + information on possible underlying root causes and + corrective actions."; + } + } + } + container summary { + if-feature "alarm-summary"; + config false; + description + "This container gives a summary of the number of alarms."; + list alarm-summary { + key "severity"; + description + "A global summary of all alarms in the system. The summary + does not include shelved alarms."; + leaf severity { + type severity; + description + "Alarm summary for this severity level."; + } + leaf total { + type yang:gauge32; + description + "Total number of alarms of this severity level."; + } + leaf not-cleared { + type yang:gauge32; + description + "Total number of alarms of this severity level + that are not cleared."; + } + leaf cleared { + type yang:gauge32; + description + "For this severity level, the number of alarms that are + cleared."; + } + leaf cleared-not-closed { + if-feature "operator-actions"; + type yang:gauge32; + description + "For this severity level, the number of alarms that are + cleared but not closed."; + } + leaf cleared-closed { + if-feature "operator-actions"; + type yang:gauge32; + description + "For this severity level, the number of alarms that are + cleared and closed."; + } + leaf not-cleared-closed { + if-feature "operator-actions"; + type yang:gauge32; + description + "For this severity level, the number of alarms that are + not cleared but closed."; + } + leaf not-cleared-not-closed { + if-feature "operator-actions"; + type yang:gauge32; + description + "For this severity level, the number of alarms that are + not cleared and not closed."; + } + } + leaf shelves-active { + if-feature "alarm-shelving"; + type empty; + description + "This is a hint to the operator that there are active + alarm shelves. This leaf MUST exist if the + /alarms/shelved-alarms/number-of-shelved-alarms is > 0."; + } + } + container alarm-list { + config false; + description + "The alarms in the system."; + leaf number-of-alarms { + type yang:gauge32; + description + "This object shows the total number of + alarms in the system, i.e., the total number + of entries in the alarm list."; + } + leaf last-changed { + type yang:date-and-time; + description + "A timestamp when the alarm list was last + changed. The value can be used by a manager to + initiate an alarm resynchronization procedure."; + } + list alarm { + key "resource alarm-type-id alarm-type-qualifier"; + description + "The list of alarms. Each entry in the list holds one + alarm for a given alarm type and resource. An alarm can + be updated from the underlying resource or by the user. + The following leafs are maintained by the resource: + 'is-cleared', 'last-change', 'perceived-severity', and + 'alarm-text'. An operator can change 'operator-state' and + 'operator-text'. + + Entries appear in the alarm list the first time an alarm + becomes active for a given alarm type and resource. + Entries do not get deleted when the alarm is cleared. + Clear status is represented as a boolean flag. + + Alarm entries are removed, i.e., purged, from the list by + an explicit purge action. For example, purge all alarms + that are cleared and in closed operator state that are + older than 24 hours. Purged alarms are removed from the + alarm list. If the alarm resource state changes after a + purge, the alarm will reappear in the alarm list. + + Systems may also remove alarms based on locally configured + policies; this is out of scope for this module."; + uses common-alarm-parameters; + leaf time-created { + type yang:date-and-time; + mandatory true; + description + "The timestamp when this alarm entry was created. This + represents the first time the alarm appeared; it can + also represent that the alarm reappeared after a purge. + Further state changes of the same alarm do not change + this leaf; these changes will update the 'last-changed' + leaf."; + } + uses resource-alarm-parameters; + list operator-state-change { + if-feature "operator-actions"; + key "time"; + description + "This list is used by operators to indicate the state of + human intervention on an alarm. For example, if an + operator has seen an alarm, the operator can add a new + item to this list indicating that the alarm is + acknowledged."; + uses operator-parameters; + } + action set-operator-state { + if-feature "operator-actions"; + description + "This is a means for the operator to indicate the level + of human intervention on an alarm."; + input { + leaf state { + type writable-operator-state; + mandatory true; + description + "Set this operator state."; + } + leaf text { + type string; + description + "Additional optional textual information."; + } + } + } + notification operator-action { + if-feature "operator-actions"; + description + "This notification is used to report that an operator + acted upon an alarm."; + uses operator-parameters; + } + } + action purge-alarms { + description + "This operation requests that the server delete entries + from the alarm list according to the supplied criteria. + + Typically, this operation is used to delete alarms that + are in closed operator state and older than a specified + time. + + The number of purged alarms is returned as an output + parameter."; + input { + uses filter-input; + } + output { + leaf purged-alarms { + type uint32; + description + "Number of purged alarms."; + } + } + } + action compress-alarms { + if-feature "alarm-history"; + description + "This operation requests that the server compress + entries in the alarm list by removing all but the + latest 'status-change' entry for all matching alarms. + Conditions in the input are logically ANDed. If no + input condition is given, all alarms are compressed."; + input { + leaf resource { + type resource-match; + description + "Compress the alarms matching this resource."; + } + leaf alarm-type-id { + type leafref { + path "/alarms/alarm-list/alarm/alarm-type-id"; + require-instance false; + } + description + "Compress alarms with this 'alarm-type-id'."; + } + leaf alarm-type-qualifier { + type leafref { + path "/alarms/alarm-list/alarm/alarm-type-qualifier"; + require-instance false; + } + description + "Compress the alarms with this + 'alarm-type-qualifier'."; + } + } + output { + leaf compressed-alarms { + type uint32; + description + "Number of compressed alarm entries."; + } + } + } + } + container shelved-alarms { + if-feature "alarm-shelving"; + config false; + description + "The shelved alarms. Alarms appear here if they match the + criteria in /alarms/control/alarm-shelving. This list does + not generate any notifications. The list represents alarms + that are considered not relevant by the operator. Alarms in + this list have an 'operator-state' of 'shelved'. This + cannot be changed."; + leaf number-of-shelved-alarms { + type yang:gauge32; + description + "This object shows the total number of current + alarms, i.e., the total number of entries + in the alarm list."; + } + leaf shelved-alarms-last-changed { + type yang:date-and-time; + description + "A timestamp when the shelved-alarm list was last changed. + The value can be used by a manager to initiate an alarm + resynchronization procedure."; + } + list shelved-alarm { + key "resource alarm-type-id alarm-type-qualifier"; + description + "The list of shelved alarms. Shelved alarms can only be + updated from the underlying resource; no operator actions + are supported."; + uses common-alarm-parameters; + leaf shelf-name { + type leafref { + path "/alarms/control/alarm-shelving/shelf/name"; + require-instance false; + } + description + "The name of the shelf."; + } + uses resource-alarm-parameters; + list operator-state-change { + if-feature "operator-actions"; + key "time"; + description + "This list is used by operators to indicate the state of + human intervention on an alarm. For shelved alarms, the + system has set the list item in the list to 'shelved'."; + uses operator-parameters; + } + } + action purge-shelved-alarms { + description + "This operation requests that the server delete entries from + the shelved-alarm list according to the supplied criteria. + In the shelved-alarm list, it makes sense to delete alarms + that are not relevant anymore. + + The number of purged alarms is returned as an output + parameter."; + input { + uses filter-input; + } + output { + leaf purged-alarms { + type uint32; + description + "Number of purged alarms."; + } + } + } + action compress-shelved-alarms { + if-feature "alarm-history"; + description + "This operation requests that the server compress entries + in the shelved-alarm list by removing all but the latest + 'status-change' entry for all matching shelved alarms. + Conditions in the input are logically ANDed. If no input + condition is given, all alarms are compressed."; + input { + leaf resource { + type leafref { + path "/alarms/shelved-alarms/shelved-alarm/resource"; + require-instance false; + } + description + "Compress the alarms with this resource."; + } + leaf alarm-type-id { + type leafref { + path "/alarms/shelved-alarms/shelved-alarm" + + "/alarm-type-id"; + require-instance false; + } + description + "Compress alarms with this 'alarm-type-id'."; + } + leaf alarm-type-qualifier { + type leafref { + path "/alarms/shelved-alarms/shelved-alarm" + + "/alarm-type-qualifier"; + require-instance false; + } + description + "Compress the alarms with this + 'alarm-type-qualifier'."; + } + } + output { + leaf compressed-alarms { + type uint32; + description + "Number of compressed alarm entries."; + } + } + } + } + list alarm-profile { + if-feature "alarm-profile"; + key "alarm-type-id alarm-type-qualifier-match resource"; + ordered-by user; + description + "This list is used to assign further information or + configuration for each alarm type. This module supports a + mechanism where the client can override the system-default + alarm severity levels. The 'alarm-profile' is also a useful + augmentation point for specific additions to alarm types."; + leaf alarm-type-id { + type alarm-type-id; + description + "The alarm type identifier to match."; + } + leaf alarm-type-qualifier-match { + type string; + description + "An XML Schema regular expression that is used to match the + alarm type qualifier."; + reference + "XML Schema Part 2: Datatypes Second Edition, + World Wide Web Consortium Recommendation + REC-xmlschema-2-20041028"; + } + leaf resource { + type resource-match; + description + "Specifies which resources to match."; + } + leaf description { + type string; + mandatory true; + description + "A description of the alarm profile."; + } + container alarm-severity-assignment-profile { + if-feature "severity-assignment"; + description + "The client can override the system-default severity + level."; + reference + "ITU-T Recommendation M.3100: + Generic network information model + ITU-T Recommendation M.3160: + Generic, protocol-neutral management information model"; + leaf-list severity-level { + type severity; + ordered-by user; + description + "Specifies the configured severity level(s) for the + matching alarm. If the alarm has several severity + levels, the leaf-list shall be given in rising severity + order. The original M3100/M3160 ASAP function only + allows for a one-to-one mapping between alarm type and + severity, but since YANG module supports stateful + alarms, the mapping must allow for several severity + levels. + + Assume a high-utilization alarm type with two thresholds + with the system-default severity levels of threshold1 = + warning and threshold2 = minor. Setting this leaf-list + to (minor, major) will assign the severity levels as + threshold1 = minor and threshold2 = major"; + } + } + } + } + + /* + * Notifications + */ + + notification alarm-notification { + description + "This notification is used to report a state change for an + alarm. The same notification is used for reporting a newly + raised alarm, a cleared alarm, or changing the text and/or + severity of an existing alarm."; + uses common-alarm-parameters; + uses alarm-state-change-parameters; + } + + notification alarm-inventory-changed { + description + "This notification is used to report that the list of possible + alarms has changed. This can happen when, for example, a new + software module is installed or a new physical card is + inserted."; + } +} |