DevNet Technical Breakout: Introduction to ACI Programming and APIs.
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2 DevNet Technical Breakout: Introduction to ACI Programming and APIs. Michael Cohen
3 Agenda Introduction to ACI ACI Policy ACI APIs REST API Python API L4-7 Scripting Opflex 3
4 Application Centric Infrastructure APIC CONTROLLER POLICY MODEL NEXUS 9300 and 9500 Building Blocks of ACI
5 ACI: Rapid deployment of applications onto networks with Scale, Security and Full Visibility Detailed Telemetry and Visibility Enabled by Physical and Virtual Integration 5
6 ACI Vision: Rapid Deployment of Applications with Scale, Security, and Full Security Physical Networking Hypervisors and Virtual Networking Compute L4 L7 Services Storage Multi DC WAN and Cloud Cloud AUTOMATION / REALTIME APPLICATION AGILITY IMPROVED TCO AVAILABLE / VISIBLE SECURE / SCALE ANY EDGE 6
7 Ecosystem READ / WRITE ALL FABRIC INFO APIC TENANT AND APPLICATION AWARE PUBLISHED DATA MODEL OPEN SOURCE Industry Standard Compliant and Certified 7
8 Fabric Overview APIC Web P App P DB Application Network Profile Abstracted, Stateless Fabric 8
9 Current Network Challenges Layer 4-7 Security Services Routing Layer 3 Web Subnet App Subnet Database Subnet Layer 2 Web VLAN App VLAN DB VLAN Layer 1 9
10 Value of Abstraction Security Load Balancing App 1 App 2 App 3 Other Services Abstraction Complexity Tier A L2/L3 Tier B L2/L3 Tier n Addressing Forwarding Topology Network 10
11 Policy-Driven Architecture Security Load Balancing Other Services Tier A Policy Tier B Policy Tier n Addressing Forwarding Topology 11
12 Elements Control System Admin Imperative Model of Computation Manager pushes configuration changes to devices. Manager must be aware of state and capabilities of each device. Deploy Application X With Scale: System complexity increases Controller processing intensity increases Margin of error increases Code requirement increases Configure a,b,c Perform d,e,f Construct g,h,i Management system must know everything about every device. 12
13 Faults Elements Control System Admin ACI Model: Based on Promise Theory I want things to look like x Do X Will Do With Scale: Model remains intact Scales linearly with object driven model Objects are responsible for requested configuration No assumptions are made about current object state Applicable changes made Relies on trust relationships and end-device ownership of configuration change. 13
14 End Point Groups (EPGs) HTTPS Service HTTPS Service HTTP Service HTTP Service EPG HTTPS Service HTTPS Service HTTP Service HTTP Service All endpoints in an EPG share the same policy: Connectivity Security QoS Services EPGs are a grouping of application or application components independent of other network identifiers or location. 14
15 EPGs, Subnets, and Policy EPG A Policy/Security enforcement occurs at the EPG level HTTPS Service HTTPS Service HTTPS Service HTTPS Service x HTTP Service HTTP Service x HTTP Service HTTP Service EPGs separate the addressing of an application from it s mapping and policy enforcement on the network. 15
16 Application Network Profiles Application Network Profile Inbound/Outbound Policies Inbound/Outbound Policies Application Network profiles are a group of EPGs and the policies that define the communication between them. 16
17 Tenant Model Tenant Customer/ BU/ Group Context Context VRF Bridge Domain Bridge Domain Bridge Domain L2 Boundary Subnet A Subnet B Subnet D Subnet B Subnet F IP Space(s) EPG A EPG B EPG C EPG A EPG C EPG B Groups of endpoints and the policies that define their connection 17
18 Contracts Application Network Profile EPG MGMT Contracts define what an EPG exposes to other app tiers and how C C Contract C EPG Web C EPG App C EPG DB Contracts are reusable for multiple EPGs and EPGs can inherit multiple contracts C EPG NFS 18
19 Defining EPG Relationships Via Contracts EPG Web EP 1 EP 2 Contract Subject 1 Filter Action Label EP 1 EPG App EP 2 Subject 2 EPG communication is defined by mapping EPGs to one another via contracts. 19
20 Summary: Network Profiles Entity Tenant Application Network Profile Description Tenant represents a policy owner in the virtual fabric. Application Profile is the definition of tenant's policy representing a set of requirements that given application instance has on virtualizable fabric. Such policy regulates connectivity and visibility amongst end-points in-scope. End Point Group (EPG) End point groups represent groups of elements (virtual machines, physical servers, etc.) essentially identified by port on a network. EPG s essentially capture groups of machines with the same policies. This is highly efficient as policy changes are propagated from higher level orchestration systems Contracts Contracts represent policies between EPGs. Contracts are provided by one EPG and consumed by another. Filters Bridge Domain Context Filters encode specific rules within a contract Bridge domain is a L2 context (may or may not include broadcast semantics) L3 context, essentially a VRF 20
21 ACI Programmability Overview Python SDK DevOps Libraries Coming soon REST API APIC Designed around Open APIs & Open Source ACI-enabled Fabric devices L4-7 Scripting APIs 21
22 REST API Deep Dive APIC Simulator Virtual machine + mininet to simulate leaf-spine Supports all APIC configuration Does not include a datapath APIC is based on a hierarchical object model. EVERYTHING is represented as an object and every object can be manipulated via REST. REST operations: POST, GET, DELETE Support for JSON and XML 22
23 REST API Deep Dive (2) Format: class}/{dn classname}.{json/xml}[?options] /api/ Specifies that the message is directed to the API. mo class Specifies whether the target of the operation is a managed object (MO) or an object class. dn Specifies the distinguished name (DN) of the targeted MO. classname Specifies the name of the targeted class. This name is a concatenation of the package name of the object queried and the name of the class queried in the context of the corresponding package. For example, the class aaa:user results in a classname of aaauser in the URI. json xml Specifies whether the encoding format of the command or response HTML body is JSON or XML. 23
24 REST API Example - Authenticate Authenticate a user for API Operation POST: Body (XML): <aaauser name="georgewa" pwd="password1" /> 24
25 Creating a Tenant REST XML REST JSON HTTP Method: POST HTTP Method: POST Request URL: Request URL: Payload: <fvtenant name='tenant1' status='created,modified'> </fvtenant> Payload: {"fvtenant": {"attributes": {"name": {"value": "MrT"}}}} Where to find these examples: 25
26 Creating an App Network Profile REST XML REST JSON HTTP Method: POST HTTP Method: POST Request URL: Request URL: Payload: <fvtenant name='tenant1' status='created,modified'> <fvap name='webapp'> </fvap> </fvtenant> Payload: {"fvtenant": {"attributes": {"name": {"value": "Tenant1"}}, "children": [{"fvrstenantmonpol": {}}, {"fvap": {"attributes": {"name": {"value": "WebApp"}}}}, {"fvrsresmonepgpol": {}}]}} 26
27 Creating an App Network Profile REST XML REST JSON HTTP Method: POST HTTP Method: POST Request URL: Request URL: Payload: <fvtenant name="t1" status="created,modified"> <fvap name=" status="created,modified"> <fvaepg name="web" status="created,modified">. Payload: {"fvtenant": {"attributes": {"name": {"value": "T1"}}, "children": [{"fvap": {"attributes": {"name": {"value": " "children": [{"fvaepg":. 27
28 L4-7 Scripting API APIC interfaces with the device using python scripts APIC calls device specific python script function on various events APIC APIC uses device configuration model provided in the package to pass appropriate configuration to the device scripts Device script handlers interface with the device using its REST or CLI interface Device Script (Python / CLI) Device Spec (XML) Uses Device s native API
29 Device Packages Adding a new Device type to the APIC is done by uploading a DevicePackage. The DevicePackage is a zip file containing all the information needed for the APIC to integrate with any type of Service Devices. Two files are relevant in this context: DeviceSpecification: A Device type is defined by a tree of MOs with a Meta Device (MDev) at the root. Device Package Device Specification <dev type= f5 > <service type= slb > <param name= vip > <dev ident= <validator= ip <hidden= no > <locked= yes > APIC DeviceScript: The integration between the APIC and a Device is performed by a DeviceScript, which maps APIC events to Device interactions. DeviceScript DeviceSpec The DevicePackage can be created by a 3 rd party vendor, Cisco, or by customers directly. Its ntended to be easy to do through existing APIs. Partne Rest/CLI r Partner Device 29
30 Device Package Example Device Specification Device Script omation/sampledevice 30
31 ACI Fabric Attached Device API Open API between a controller and a set of network devices designed to natively support ACI Policy Supported over TCP/SSL/HTTP APIC Logical policy model is pushed directly from controller (Policy Authority) to device (Policy Element), which renders it in sw / hw Policy Elements could be leaf switches in a network fabric, hypervisor switches, or L4-7 devices Open source C based agent will be released ACI Agent* ACI Agent* ACI Agent* ACI Agent* Hypervisor Hypervisor Hypervisor Hypervisor
32 Example: Hypervisor Switches Two key functions: Fabric Attached Entity Transition Sent from network device to the controller Endpoint attach / detach, faults, events, etc. Policy Update Sent from controller to the network device when policy is changed User driven policy changes pushed to the network 32
33 Conclusion ACI is based on policy model abstraction that models application semantics ACI supports a number of open northbound and southbound APIs that are easy to use: REST API Python API L4-7 Scripting Opflex (native ACI Policy API) 33
34 Key Links Github Devnet 34
35 Cisco DevNet Cisco s New Developer Program All of the developer resources you need are finally in one central location Comprehensive API Index Forums Developer Sandbox FAQs Access to support, and more The interactive new portal makes finding the information and support faster and easier. Register at 35
36 Call to Action Visit the World of Solutions:- Cisco Campus Walk-in Labs Technical Solutions Clinics Meet the Engineer Lunch Time Table Topics, held in the main Catering Hall Recommended Reading: For reading material and further resources for this session, please visit 36
37 Complete Your Online Session Evaluation Complete your online session evaluation Complete four session evaluations and the overall conference evaluation to receive your Cisco Live T-shirt 37
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