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Cisco connect montreal 2018 saalvare md-program-xr-v2
1.
Cisco Connect Montreal Canada
• 20 November 2018 Global vision. Local knowledge.
2.
Santiago Álvarez saalvare@cisco.com Model-Driven Programmability
for Cisco IOS XR @111pontes
3.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Confidential Agenda • Introduction • Data Models • Management Protocols • Model-Driven SDK • Telemetry • Demonstration
4.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Introduction
5.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Speed and scale demand software automation and data analytics • Rapid innovation as competitive advantage • One network operator per 1000s / 10000s of complex network devices Motivations for Network Programmability
6.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Cisco IOS XR Device Programmability Data Plane Control Plane Management Plane App Controller Orchestrator Controller Orchestrator Data Plane Control Plane App Model-Driven Manageability Service Layer API
7.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Model-Driven Manageability Controller Orchestrator Network Device Model-Driven Configuration Model-Driven Telemetry Closed-loop automation Encoding Protocol Models SDK Apps XML JSON GPB NETCONF gRPC Model-Driven SDKs YANG Development Kit (YDK) YANG Models (native, open) App App App SSH HTTPTransport TCP
8.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Model based, structured, computer friendly • Multiple model types (native, OpenConfig, IETF, etc.) • Models decoupled from transport, protocol and encoding • Choice of transport, protocol and encoding • Model-driven SDKs for abstraction and simplification • Wide standard support while leveraging open source Benefits of Model-Driven Manageability
9.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Data Models
10.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Data (config and operational) and actions/commands (RPCs) in a tree structure • Self-documented and shipped with devices • Native (XR specific) and open (vendor neutral) models • Native models provide most coverage • Open (OpenConfig and IETF) provide reduced coverage • Open models internally mapped to native models Data Models in Cisco IOS XR Native Open (OpenConfig / IETF)
11.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Provide most comprehensive coverage for device functionality • Approximately 365+ models in XR 6.5.1 (780+ YANG files) • A single model defines either configuration (cfg), operational state (oper) or an action/command (act) • Cisco-IOS-XR-ipv4-bgp-cfg • Cisco-IOS-XR-ipv4-bgp-oper • Cisco-IOS-XR-ipv4-bgp-act • Models posted at • https://github.com/YangModels/yang/tree/master/vendor/cisco/xr Cisco IOS XR Native Data Models
12.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Operator group pursuing more dynamic and programmable networks • Vendor-neutral data models (YANG) • Models designed by operators for operators • Model coverage still limited, but model development rapidly evolving • New models in active development • Actions/commands (RPCs) not defined using YANG • gRPC network management interface (gNMI) • gRPC network operations interface (gNOI) OpenConfig Data Models
13.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Comprehensive support in Cisco IOS XR (6.0.0 and later) OpenConfig Data Models In Cisco IOS XR Cisco IOS XR Native acl network-instance aft isis bgp, bgp-policy interfaces, if-aggregate, if- ethernet, if-ip lacp lldp local-routing mpls platform rib-bgp routing-policy telemetry vlan channel_monitor, terminal_device, optical_amplifier, transport_line_common, transport_line_protection
14.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Native data models provide most configuration and operational coverage • Open models mapped to native data models • Departures from open models specified as deviation module Native vs Open Data Models Native Model Open Model Native device config/oper data Mapped config/oper data Deviations
15.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Management Protocols
16.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential XML NETCONF • Rich functionality to manage configuration and operational (state) data • Operations defined as RPCs (request / reply) in XML • Client/app initiate request towards server/device • Supports running, candidate and startup configurations • Capability exchange during session initiation NETCONF Protocol Overview YANG SSH
17.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Main NETCONF Protocol Operations Operation Description get-config Retrieve all or part of a specified configuration edit-config Loads all or part of a specified configuration (merge, replace, create, delete, remove) copy-config Create or replace an entire configuration datastore get Retrieve all or part of running configuration and device operational data get-schema Retrieve device schema (model) lock Lock entire configuration datastore (e.g. candidate) unlock Remove lock on entire configuration datastore (e.g. candidate) close-session Request graceful session termination
18.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential NETCONF Edit-Config Operations Operation Description Merge Merge configuration with existing configuration (default) Replace Replace configuration with existing configuration Create Create configuration if non-existent. Otherwise, return error. (non-idempotent*) Delete Delete configuration if existent. Otherwise, return error. (non-idempotent) Remove Remove configuration. Ignore if configuration non- existent. * Cannotbe applied multiple times without changingthe result beyond the initial application
19.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Cisco gRPC CLIJSON YANG HTTP/2 • Google RPC provides a general (open source) RPC framework • Interface definition in Cisco IOS XR specifies device operations • Functional subset of NETCONF • Simple client development • High performance Overview of gRPC on Cisco IOS XR GPB
20.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Protocol Operations in Cisco IDL Operation Description GetConfig Retrieve configuration MergeConfig Merge configuration DeleteConfig Delete configuration ReplaceConfig Replace configuration CommitReplace Replace entire configuration GetOper Retrieve operational data CliConfig Merge configuration data in CLI format ShowCmdTextOutput Retrieves CLI show-command output data
21.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Protocol Operations in gNMI IDL Operation Description capabilities Discover device capabilities (models, encodings, version, extensions) get Retrieve device state set Modify device state (delete, replace, update) subscribe Subscribe to device update
22.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Based on gNMI v0.4.0 • Introduced in release 6.5.1 • Set and Get RPCs use JSON_IETF (RFC 7951) and ASCII (CLI) encoding • Subscribe RPC • Paths must consider data aggregation points (no arbitrary paths) • No aliases gNMI Implementation in Cisco IOS XR
23.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Model-Driven SDK ydk.io
24.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Simplify app development • One-to-one correspondence between model and class hierarchy • Abstract protocol, transport, encoding, modeling language • SDK generated from YANG models • Automatic data validation • Multi-language (Python, C++, Go, etc.) Model-Driven SDK: YANG Development Kit (YDK) YANG Model Class Hierarchy (Python, C++, Go)
25.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Models group Python APIs created for each YANG model • Services perform operations on model objects (interface) • Providers implement services (implementation) YDK API Structure Models (BGP, IS-IS, etc) Services (CRUD, NETCONF, Codec, Executor, etc.) Providers (NETCONF, RESTCONF, OpenDaylight, Codec, etc.)
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© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Client will automatically perform local validation based on model constraints • Check between type of data: config (read-write) and state (read-only) • Type check (enum, string, etc.) • Value check (range, pattern, etc.) • Semantic check (key uniqueness/presence, mandatory leafs, etc.) • Model deviation check (unsupported leafs, etc.) YDK Client-Side Validation Application (client) Device (server)
27.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential A YDK-Py “Hello World” Using OpenConfig BGP # Cisco YDK-Py OC-BGP “Hello world” from ydk.services import CRUDService from ydk.providers import NetconfServiceProvider from ydk.models.openconfig import openconfig_bgp as oc_bgp if __name__ == "__main__": provider = NetconfServiceProvider(address=10.0.0.1, port=830, username=“admin”, password=“admin”, protocol=“ssh”) crud = CRUDService() # create CRUD service bgp = oc_bgp.Bgp() # create oc-bgp object bgp.global_.config.as_ = 65000 # set local AS number crud.create(provider, bgp) # create on NETCONF device exit() # End of script module: openconfig-bgp +--rw bgp +--rw global | +--rw config | | +--rw as | | +--rw router-id? | +--ro state | | +--ro as | | +--ro router-id? | | +--ro total-paths? | | +--ro total-prefixes? ...
28.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential How to Get YDK-Py Native Virtual dCloud Install Python Install YDK Download ydk-py-samples YANG Development Kit Sandbox Install Vagrant Install Virtualbox Download ydk-py-samples * * Releases 0.5.5 and earlier Install docker Download ydk-py-samples
29.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Telemetry
30.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Automatic streaming (push) of remote data for monitoring • Enables publish–subscribe (pub-sub) messaging pattern • Scalable and flexible alternative to traditional device monitoring (SNMP, syslog, CLI) • Leverages operational data models on device Model-Driven Telemetry Collector Publish (Data stream) Subscrib e Operationa l data
31.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Cisco gRPC GPB YANG HTTP/2 • Loosely-coupled stack • Data encoding (JSON vs GPB) • Transport (HTTPv2 vs TCP vs UDP) • Data model (native vs open) • Session initiation • Dial-in (transient destination) • Dial-out (persistent destination) • Flexible data streaming modes (frequency vs event driven) Overview of Telemetry on Cisco IOS XR TCP / UDP JSON GPB JSON
32.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Encoding Options Compact Google Protocol Buffers (GPB) Self-describing (key- value) Google Protocol Buffers (GPB) JSON Most efficient Medium efficiency Least efficient Binary encoding Hybrid text/binary encoding Text-based encoding Data definition required to decode data stream No data definition required to decode data stream No data definition required to decode data stream
33.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Collector for telemetry data • Performs basic encoding transformation • Data producer for Kafka, InfluxDB, Prometheus, etc. • Supports dial-in and dial- out sessions Pipeline - An Open-Source Telemetry Collector Telemetry data (HTTPv2/TCP/UDP ) (JSON/GPB) gRPC dial- in Kafka Fil e InfluxDB Prometheus Pipeline
34.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Demonstration
35.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Peering Use Case Peer Configuration { "asbr": { "name": "asbr1", "address": "198.18.1.11", "as": 65001 }, “peers": [{ "address": "192.168.0.2", "as": 65002 "group": "EBGP", "interface": { "name": "GigabitEthernet0/0/0/0", "description": "Peering with AS65002", "address": "192.168.0.1", "netmask": 24 } }] } ASBR1 (AS65001) ASBR2 (AS65002) Configuration Telemetry Private Peering Config
36.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Open Source Tool Chain • Python/C++/Go bindings for OpenConfig models • Detailed client-side data validation • Protocol / transport / encoding abstraction YDK (ydk.io) Pipeline (git.io/vdnnT) Kafka (kafka.apache.org) • Collector for router streaming telemetry • Performs basic encoding transformation • Data producer for Kafka, InfluxDB, Prometheus, etc. • Distributed streaming platform (message bus) • Producer, consumer, stream and connector APIs • Rich client support (Python, Java, etc)
37.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Resources
38.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Model-driven programmability @ Cloud-Scale Networking • Model-Driven Programmability (http://goo.gl/x3GZDB) Programmability @ XR Docs • Tutorials (https://xrdocs.github.io/programmability/tutorials) • Blogs (https://xrdocs.github.io/programmability/blogs) Configuration guide • Cisco IOS XR programmability configuration guide for ASR 9000 series router (http://goo.gl/8dYUeK) • Cisco IOS XR programmability configuration guide for NCS 5500 series router (http://goo.gl/cnYPw7) Resources
39.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential YDK Portal • YDK at DevNet (http://ydk.io) YDK Sample Apps • YDK-Py sample apps (https://github.com/CiscoDevNet/ydk-py-samples) - Over 700 apps! • YDK-Cpp sample apps (https://github.com/CiscoDevNet/ydk-cpp-samples) - Coming soon Sandboxes • dCloud YANG Development Kit sandbox (https://goo.gl/kaYJ3R) • Ubuntu YDK Vagrant box (https://git.io/vaw1U) • Ubuntu YDK Docker container (https://hub.docker.com/u/ydkdev) Support • Cisco support community (https://communities.cisco.com/community/developer/ydk) Resources (cont.)
40.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential YDK Documentation • YDK-Py docs (http://ydk.cisco.com/py/docs) • YDK-Cpp docs (http://ydk.cisco.com/cpp/docs) GitHub • YDK Python SDK – YDK-Py (https://github.com/CiscoDevNet/ydk-py) • YDK C++ SDK – YDK-Cpp (https://github.com/CiscoDevNet/ydk-cpp) • YDK Go SDK – YDK-Go (https://github.com/CiscoDevNet/ydk-go) • YDK-Py sample apps (https://github.com/CiscoDevNet/ydk-py-samples) - Over 700 apps! • YDK-Cpp sample apps (https://github.com/CiscoDevNet/ydk-cpp-samples) - Coming soon Resources (cont.)
41.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Conferences • MPLS+SDN+NFV World Congress 2018: Getting started with OpenConfig (http://youtu.be/B43PRZV-CD8) • NANOG 68: Ok, We Got YANG Data Models. Now What? (http://youtu.be/2oqkiZ83vAA ) • NANOG 71: Getting started with OpenConfig (https://youtu.be/L7trUNK8NJI) • LinuxCon NA 2016: Simplifying Network Programmability Using Model-Driven APIs (https://goo.gl/W6tH2X) Resources (cont.)
42.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Summary
43.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Model-Driven Programmability • Speed and scale through automation • Rich and flexible in terms of models, transports and encodings • Data Models • Native • Open (OpenConfig / IETF) • NETCONF • Rich, mature protocol • Relies on XML encoding • Google RPC • Cisco IOS XR and OpenConfig interface definitions (device operations) • Supports JSON and unstructured data (CLI) • High performance • Model-Driven SDK • Simplify app development • Abstract transport and encoding • Automatic data validation • Telemetry • Loosely-coupled stack • Session initiation (dial-in vs dial-out) • Flexible data streaming modes Let’s Recap
44.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Thank you!
45.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Backup
46.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Modeling language for networking • Defines data hierarchy (config or oper), RPCs and notifications • Main node types • Leaf – node with name, type and value (no children) • Leaf list – sequence of leafs (no children) • Container – node that groups nodes and has no type or value • List – Series of data instances generally with one or more keys • Models extended through augmentations • Unsupported nodes specified as deviations YANG Leaf Node without type/value Node with a type/value Leaf list List key Container
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© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential YANG Model Example container community-sets { description “Container for community sets"; list community-set { key community-set-name; description "Definitions for community sets"; leaf community-set-name { type string; description "name of the community set"; } leaf-list community-member { type string { pattern '([0-9]+:[0-9]+)'; } description "members of the community set"; } } } community-sets community-set C-SET1 65172:1, 65172:2, 65172:3 ! community-set C-SET10 65172:10, 65172:20, 65172:30 ! ! YANG CLI
48.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Model Data Example community-sets community-set C-SET1 65172:1, 65172:2, 65172:3 ! community-set C-SET10 65172:10, 65172:20, 65172:30 ! ! { "community-sets": { "community-set": [ { "community-set-name": "CSET1", "community-member": [ "65172:1", "65172:2", "65172:3" ] }, { "community-set-name": "CSET10", "community-member": [ "65172:10", "65172:20", "65172:30" ] } ] } } JSON CLI
49.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential OpenConfig Major Components Config / oper models YANG gRPC Network Management Interface (gNMI) protobuf gRPC Network Operations Interface (gNOI) protobuf Data Management Protocol Operational Commands gRPC Routing Information Base Interface (gRIBI) RIB Injection protobuf
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© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Native Data Models Model Mapping Open Data Models Internal Datastore Management Protocol Model-Driven SDKs YANG Development Kit (YDK) • Mapping converts open model data to native model data and vice versa • Mapping of config and operational data (including telemetry) • Single view of config and operational data in internal datastore Open Model Mapping in IOS XR
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© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Model Data Example <community-sets> <community-set> <community-set-name>C-SET1</community-set-name> <community-member>65172:1</community-member> <community-member>65172:2</community-member> <community-member>65172:3</community-member> </community-set> <community-set> <community-set-name>C-SET10</community-set-name> <community-member>65172:10</community-member> <community-member>65172:20</community-member> <community-member>65172:30</community-member> </community-set> </community-sets> community-sets community-set C-SET1 65172:1, 65172:2, 65172:3 ! community-set C-SET10 65172:10, 65172:20, 65172:30 ! ! XML CLI
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© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential YANG Development Kit YDK-Py Python YDK-Cpp C++ Services Providers Cisco IOS XR Models OpenConfig Models IETF Models Cisco IOS XE Models ydk (core ) Module bundle s YDK-Go Go
53.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential • Additional providers (e.g. Google RPC, Cisco NSO) • Additional services (e.g. Google RPC) • Additional languages • Additional encodings (e.g. YAML, GPB) • Code generation (e.g. Python, C++) from encoded model data (e.g. JSON, XML) Future Work Items
54.
© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential Telemetry Subscriptions Sensor path Sensor path Sensor Group Destination Group Aggregation point Data Model 1 Data Model 2 Destination 1 (collector) Destination 2 (collector) Encodin g Protocol Subscripti on Encodin g Protocol
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© 2018 Cisco
and/or its affiliates. All rights reserved. Cisco Confidential 1. Load peer configuration 2. Configure interface and validate operation 3. Configure BGP neighbor and validate operation Peering Use Case Configure and Validate Peering on ASBR1 PeeringDB ASBR1 (AS65001) ASBR2 (AS65002) Configuration Telemetry Private Peering Config
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