Power. Shell Data Basics: XML - Simple Talk. Introduction As with any high- level language, the data is at the heart of Power. Cisco Nexus 3548x and 3524x Switches. The Cisco Nexus 3548x and 3524x Switches (Figure 4) are the next generation of the Cisco Nexus 3500 platform. Internet Explorer (formerly Microsoft Internet Explorer and Windows Internet Explorer, commonly abbreviated IE or MSIE) is a series of graphical web browsers. Shell. In the case of Power. Shell, this boils down to converting external data into Power. Shell objects and vice versa. This is the second of a series of articles that shows you how to import almost all of the common data formats you are likely to encounter, and how to export to some of them as well. The first article in the series, Power. Shell Data Basics: File- Based Data, covers a variety of text formats, from fixed- width, variable- width, and ragged- right files to CSV, property lists, INI files, and JSON data, and concludes with a treatment of importing and exporting to Excel. Here we concentrate on getting the most from XML. Accessing XML data in Power. Shell. There are two built- in techniques for working with XML data in Power. Shell; the XPath approach and the object dot- notation approach. We’ll describe and compare these two approaches, and try them out on some sample XML. Windows 10 (introduced v10.0.10240.0 - for Xbox, see UWP features that aren't yet supported on Xbox).
Figure 1 shows a representation of the schema underlying the file in a concise format (particularly when compared to reading the raw XSD file!), courtesy of Visual Studio’s XML Schema Explorer. From the figure, you’ll notice that the XML file is a catalog that contains a collection of books. Each book has seven characteristics, six of which are child elements and one which is a child attribute. Figure 1 Schema for Microsoft’s sample XML fileo: p> To load this sample XML file, you can use any of these: $xdoc = new- object System. Xml. Xml. Document $file = resolve- path(“.\sample. Merely define your XML as a string and cast it to XML type as we’ve just done with the Get- Content cmdlet for files. Here’s a portion of the sample XML file with only two books: 1. Microsoft Xml V3 0 Dom Document GetelementsbynameTo select a set of nodes use the Select. Nodes method: $xdoc. Select. Nodes(“//author”) #text —– Gambardella, Matthew Ralls, Kim Corets, Eva Corets, Eva Corets, Eva Randall, Cynthia Thurman, Paula Knorr, Stefan Kress, Peter O’Brien, Tim O’Brien, Tim Galos, Mike Or use Select. Single. Node to return just one node: $xdoc. Select. Single. Node(“//book. Suppose instead that you want a list of unique authors in the catalog. You might think that something like . To understand why that failed, you would need to understand more about the structure of XML documents. The first example actually returned a list of text nodes (i. The result is that only the first is returned. What you are really after is the string value of each author node. From the author node you must first access its text node (its first and only child), then the value of that text node (line A in the next example). One more variation uses the Select- Xml cmdlet which avoids a method call and so is, in some sense, a more distinctively Power. Shell approach (line C). All three lines return the same result. Both support namespaces, which I have not mentioned yet. The two methods both take an Xml. Namespace. Manager as an optional second parameter, while the Select- Xml cmdlet takes an optional Namespace parameter that specifies your namespaces in a hash table. Select- Xml, on the other hand, returns a Select. Xml. Info object (or an array of them) and its Node property provides access to the underlying node. The example just above illustrates these differences. Accessing XML as Objects. With the same Xml. Document object from the last section, Power. Shell also provides dynamic object support for XML data: This allows you to access XML data as first- class Power. Shell objects, requiring neither XPath selector nor familiarity with the details of such things as XML nodes, values or text nodes. Furthermore, you get instant, dynamic Intellisense of your XML schema when you load your XML data! Figure 2 illustrates this for the Power. Shell ISE, where you get both selection choices and word completion, just like with Power. Shell native tokens. Notice particularly in the bottom expansion that it looks for what you have typed anywhere in the property name, not just starting from the first character: Intellisense would find you a date property here whether it is named published. Note that you have word completion available in Power. Shell V2 or V3, and in Power. Shell ISE or Power. Shell console. But selection choices are only available in Power. Shell ISE in V3. Figure 2 Automatic Intellisense upon loading an XML document Here are some examples to show that the XML is indeed auto- converted to Power. Shell objects: $xdoc xml catalog — ——- version=”1. Table 1 helps you answer this question. The object approach is usually more concise (e. XPath, however, is more expressive, in that it allows you to specify some selectors that are not possible with object notation (line 7). Modifying or Creating XML Data. Given an appreciation of XML selectors from the previous sections, modifying an XML document is quite straightforward because XML selectors (either XPath or object) are L- values, i. Thus either of these will modify the author of the 6th book: $xdoc. Select. Single. Node(. You’d probably want to read the file, modify the data, and save the file back to the same name. You have seen the first two steps; the third step is done with the Save method on the Xml. Document. Putting these all together, then, yields this basic code: ! This simple bit of code illustrates a seemingly minor but important Power. Shell notion; ignorance of this has led to many blog posts claiming it is a bug in Power. Shell. The problem is that your working directory and your Power. Shell location are not the same thing. The above code reads the file just fine, it modifies the data just fine, but it does not necessarily save the new file where you expect it to. Get- Content, being a Power. Shell cmdlet, sees a file path relative to the Power. Shell location. The Xml. Document. Save method, on the other hand, sees a file path relative to the Power. Shell process’ working directory because that method call is outside of Power. Shell. If you have not executed Set- Location (or its alias cd) in your current Power. Shell session, both point to the same directory. To confirm this, execute these two statements: Get- Location # displays Power. Shell location. See Alex Angelopoulos’ article Why the Power. Shell Working Directory and the Power. Shell Location Aren’t One in the Same for more. One approach I like is from Tobias Weltner’s blog entry Write, Add and Change XML Data: take an existing node of the type that you wish to create, make a copy of that node and modify the copy with your new data, and finally insert the copied node into your XML as a sibling of the original. The method checks to see whether the node you are asking to add is already in the document. If so, it moves it to the new location you specify. Thus, when you do want to copy nodes, you must start with the Clone method as illustrated above.)For further exploration on manipulating XML data with . NET methods, see Process XML Data Using the DOM Model on MSDN. Using XML for Object Serialization. Power. Shell provides an easy way to persist objects by using Export- Clixml to serialize any object and store it in an XML file and Import- Clixml to restore the object from XML. With XML, unlike most other serialization techniques, object integrity is preserved: upon restoring an object from XML all properties are properly typed as is the parent object itself, so all methods on the original object are available on the regenerated object as well. To use Export- Clixml, simply pipe any object collection to it and specify a destination file. Here is a simple example showing that the output from Get- Child. Item, a collection of File. System. Info objects, is regenerated: Get- Child. Item c: \usr\tmp. Cisco Nexus 3. 54. Switches Data Sheet. Cisco Nexus 3. 00. Series Switches Overview. The Cisco Nexus. Introduced in April 2. Layer 2 and 3 performance and is suitable for top- of- the- rack (To. R) architecture. This series of switches has established itself as a leader in high- frequency trading (HFT), high- performance computing (HPC), and big data environments by pairing high performance and low latency with innovations in performance visibility, automation, and time synchronization. Cisco Nexus 3. 50. Platform Overview. The Cisco Nexus 3. Cisco Nexus 3. 00. Series by including the innovative Cisco. Algo Boost technology, built into the switch application- specific integrated circuit (ASIC), allows the Cisco Nexus 3. Layer 2 and 3 switching latencies of less than 2. In addition, Algo Boost offers several innovations in latency, forwarding, and performance visibility capabilities. In this mode, latencies as low as 2. Layer 2 and 3 scaling values listed later in this document, in Table 6 and 7. In this mode, latencies as low as 1. Layer 2 and 3 scaling values listed later in this document, in Table 6 and 7. The Cisco Nexus 3. SPAN capability allows all traffic entering a single port on the switch to be replicated to any number of destination ports at latencies as low as 5. The Cisco Nexus 3. NAT for IPv. 4 unicast routed packets without incurring any additional latency. The Cisco Nexus 3. NAT to the platform’s capability. Customers hosting co- locations will find this feature useful in simplifying their network topologies and concealing details of their data centers. The Cisco Nexus 3. Customers can identify latency on a specific egress port through the command- line interface (CLI) and export this information to a file. The programmability of the Cisco Nexus 3. Today’s switches do not adequately inform administrators about the presence of this congestion, leaving them unaware and hindered in their ability to address the conditions causing suboptimal performance. Previous buffer utilization monitoring techniques were based entirely on software polling algorithms with polling intervals higher than 1. In contrast, Algo Boost accelerates the collection of buffer utilization data in hardware, allowing sampling intervals of 1. Using IEEE 1. 58. PTP, Cisco Nexus 3. Series Switches can deliver highly accurate precision time synchronization to applications within existing network infrastructure with no need to invest in and deploy a separate timing network. To assist in this effort, the Cisco Nexus 3. With Cisco Nexus 3. These fixed switches are compact one- rack- unit (1. RU) form- factor 1. Gigabit Ethernet switches that provide line- rate Layer 2 and 3 switching with ultra- low latency. Both software licenses run the industry- leading Cisco. NX- OS Software operating system, providing customers with comprehensive features and functions that are deployed globally. The Cisco Nexus 3. PHY) chips, allowing low latency and low power consumption. Port- side exhaust airflow is useful when the port side of the switch sits on a hot aisle and the power supply side sits on a cold aisle. Port- side intake airflow is useful when the power supply side of the switch sits on a hot aisle and the port side sits on a cold aisle. Colored handles on each fan or power supply clearly indicate the airflow direction, as seen in Figures 2 and 3. Figure 2. Like the previous generation, these switches are compact 1. RU form- factor 1. Gigabit Ethernet switches and provide line- rate Layer 2 and 3 switching with ultra- low latency. In addition, they consume 2. This new generation introduces powerful hardware- based multicast NAT and latency monitoring capabilities and a second USB port for easier manageability. Figure 4. Port- side exhaust airflow is useful when the port side of the switch sits on a hot aisle and the power supply side sits on a cold aisle. Port- side intake airflow is useful when the power supply side of the switch sits on a hot aisle and the port side sits on a cold aisle. Colored handles on each fan or power supply clearly indicate the airflow direction, as seen in Figures 5 and 6. Figure 5. Cisco NX- OS helps ensure continuous availability and sets the standard for mission- critical data center environments. The self- healing and highly modular design of Cisco NX- OS makes zero- impact operations a reality and provides exceptional operational flexibility. Focused on the requirements of the data center, Cisco NX- OS provides a robust and comprehensive feature set that meets the networking requirements of present and future data centers. With an XML interface and a command- line interface (CLI) like that of Cisco IOS. Cisco NX- OS modular processes are instantiated on demand, each in a separate protected memory space. Thus, processes are started and system resources allocated only when a feature is enabled. The modular processes are governed by a real- time preemptive scheduler that helps ensure timely processing of critical functions. Cisco Smart Call Home and Cisco Online Health Management System (OHMS) are some of the features that enhance the serviceability of Cisco NX- OS. The Cisco NX- OS XML interface provides a consistent API for devices. Cisco NX- OS also provides support for Simple Network Management Protocol (SNMP) Versions 1, 2, and 3 MIBs. This approach replaces the traditional purpose- built matrix switches with these switches. You can interconnect these switches to build a multilayer topology for tap or SPAN aggregation infrastructure. Administrators can customize access and restrict it to only the users who require it. The default system software has a comprehensive Layer 2 feature set with extensive security and management features. To enable certain Layer 3 IP unicast and multicast routing functions, NAT, warp mode, and warp SPAN, additional licenses must be installed, as described in Table 2. See Table 9 later in this document for a complete software feature list. Table 2. Cisco DCNM is designed for the Cisco Nexus hardware platforms, which are enabled for Cisco NX- OS. Cisco DCNM is a Cisco management solution that increases overall data center infrastructure uptime and reliability, improving business continuity. Focused on the management requirements of the data center network, Cisco DCNM provides a robust framework and comprehensive feature set that can meet the routing, switching, and storage administration needs of present and future data centers. Cisco DCNM automates the provisioning process, proactively monitors the LAN by detecting performance degradation, secures the network, and simplifies the diagnosis of dysfunctional network elements. Cisco Nexus Data Broker. The Cisco Nexus 3. Cisco Nexus Data Broker can be used to build a scalable and cost- effective traffic monitoring infrastructure using network taps and SPAN. This approach replaces the traditional purpose- built matrix switches with one or more Open. Flow- enabled Cisco Nexus switches. You can interconnect these switches to build a scalable tap or SPAN aggregation infrastructure. You also can combine tap and SPAN sources to bring the copy of the production traffic to this tap or SPAN aggregation infrastructure. In addition, you can distribute these sources and traffic monitoring and analysis tools across multiple Cisco Nexus switches. For more details, visit http: //www. Transceiver and Cabling Options. The Cisco Nexus 3. Megabit Ethernet and 1, 1. Gigabit Ethernet connectivity options. For in- rack or adjacent- rack cabling, the Cisco Nexus 3. SFP+ direct- attach copper cabling, an innovative solution that integrates transceivers with Twinax cables into an energy- efficient and low- cost solution. For longer cable runs, multimode and single- mode optical SFP+ transceivers are supported. Table 3 lists the supported 4. Gigabit Ethernet transceiver options. Gigabit Ethernet is achieved on the Cisco Nexus 3. SFP+ interfaces into a logical 4. Gigabit Ethernet port. The resulting interface is fully compliant with the IEEE standard for 4. Gigabit Ethernet and thus is interoperable with any other 4. Gigabit Ethernet device, regardless of interface form factor, including Quad SFP (QSFP). Table 3. Both the uplink and downlink 1. Gigabit Ethernet interfaces can also operate in 1. Megabit Ethernet and 1 Gigabit Ethernet modes. Table 5 lists the Gigabit Ethernet SFP transceivers that are supported. Megabit Ethernet connectivity can be achieved by using copper- based SFP transceivers (GLC- T). Table 5. Table 8 lists hardware specifications common to all four switches, and Table 9 lists software features common to all four switches. Table 1. 0 lists management standards and support. Table 6. Cisco NX- OS interoperates with any networking OS, including Cisco IOS Software, that conforms to the networking standards mentioned in this data sheet. Regulatory Standards Compliance. Table 1. 1 summarizes regulatory standards compliance for the Cisco Nexus 3. Series. Table 1. 1. Second Edition. The warranty includes hardware replacement with a 1. RMA). Service and Support. Cisco offers a wide range of services to help accelerate your success in deploying and optimizing the Cisco Nexus 3. Series in your data center. The innovative Cisco Services offerings are delivered through a unique combination of people, processes, tools, and partners and are focused on helping you increase operation efficiency and improve your data center network. Cisco Advanced Services uses an architecture- led approach to help you align your data center infrastructure with your business goals and achieve long- term value. Cisco SMARTnet. With this service, you can take advantage of the Cisco Smart Call Home service capability, which offers proactive diagnostics and real- time alerts on your Cisco Nexus 3. Series Switches. Spanning the entire network lifecycle, Cisco Services helps increase investment protection, optimize network operations, support migration operations, and strengthen your IT expertise. Cisco Capital. Financing to Help You Achieve Your Objectives.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
August 2017
Categories |