Home > Articles > Advanced Features

Advanced Features

Chapter Description

In this sample chapter from Implementing Cisco HyperFlex Solutions, you will review the HyperFlex HX Data Platform disaster recovery feature and configuration steps needed to enable replication between two HyperFlex clusters.

From the Book

Implementing Cisco HyperFlex Solutions

Implementing Cisco HyperFlex Solutions

$47.99 (Save 20%)

Replication Networking Overview

The HyperFlex clusters that will replicate must have TCP/IP connectivity between them, and additional IP addresses must be provided to an internal IP address pool that the HX SCVMs will use. The minimum number of IP addresses required is the number of nodes in the cluster plus 1 additional address. More addresses than are currently needed can be placed into the pool to allow for future growth of the HX cluster. An existing VLAN ID and subnet can be used, although it is more typical to configure a specific VLAN and subnet to carry replication traffic that will traverse the campus or WAN links between the two clusters. The VLANs that will be used for replication traffic must already be trunked to the Cisco UCS fabric interconnects from the Northbound network by the upstream switches, and this configuration step must be done manually prior to beginning the HyperFlex Connect configuration. The bandwidth usage of the replication traffic can be set to a limit to avoid saturation of the interconnecting network links, or it may be left unlimited, in which case the maximum network bandwidth is set as the total available to the network. The bandwidth consumption will be directly affected by the number of VMs being protected and the frequency of their replication. The set bandwidth limit must not exceed the physical bandwidth, and it must be the same on both sites of the disaster recovery environment. The allowed low bandwidth is 10 Mbps, and the maximum latency supported with 10 Mbps is 75 ms.

The interconnection between the two clusters at the two sites can be done in several ways. In most cases, the uplinks from the HX clusters carry all the needed VLAN IDs on the same set of interfaces, including HX management, vMotion, storage traffic, guest VM traffic, and the replication traffic. In some cases, it is desired that the replication traffic traverse a set of independent uplinks, which is referred to as a split L2 topology. However, due to a technical limitation, the configuration of replication networking cannot accommodate a split L2 configuration. Specifically, a single Cisco UCS vNIC cannot carry multiple VLANs that traverse multiple uplink groups. Because the default configuration uses vmnic0 and vmnic1 to carry HX management traffic and replication traffic, both of those VLANs must arrive to UCS across a single set of uplinks. The replication subnets and VLANs used in the two sites can be different routed subnets, or they can be a single subnet if the WAN is using other technologies, such as Overlay Transport Virtualization (OTV). Replication traffic originates and terminates on the SCVMs running on each HX host.

Figure 6-2 shows the network topology of a two-HX cluster.


Figure 6-2 Replication Network

Replication Network Considerations

A replication network must be established between clusters that are expected to use replication for data protection. This replication network is created to isolate inter-cluster replication traffic from other traffic within each cluster and site.

The following is a list of considerations when configuring replication networks and pairing:

  • To support efficient replication, all M nodes of Cluster A have to communicate with all N nodes of Cluster B, as illustrated in Figure 6-3 in the next section.

  • To enable replication traffic between clusters to cross the site boundary and traverse the Internet, each node on Cluster A should be able to communicate with each node on Cluster B across the site boundary and the Internet.

  • The replication traffic must be isolated from other traffic within the cluster and the data center.

  • Creating this isolated replication network for intercluster traffic involves creating a replication network on each cluster and then pairing clusters to associate the clusters and establish M*N connectivity between the clusters.

  • IP addresses, subnet, VLAN, and gateway are associated with each replication network of each cluster. You must configure the corporate firewall and routers on both sites to allow communication between the clusters and the sites on TCP ports 9338, 3049, 9098, 4049, and 4059.


Figure 6-3 M*N Cluster Connectivity

M*N Connectivity Between Clusters

Figure 6-3 shows the connectivity between two clusters: a primary cluster with four nodes and a secondary cluster with four nodes.

Configuring a Replication Network in HX Connect

A replication network can be configured only once. Once a replication network is configured, you can edit the available IP addresses and the networking bandwidth. Here’s how you configure the network:

  • Step 1. Log in to HX Connect as administrator by entering the username and password, as shown in Figure 6-4, and clicking Login.

    FIGURE 6-4

    Figure 6-4 HX Connect Login Page

  • Step 2. In the HyperFlex Connect screen that appears, select the Replication page and then click Replication Configuration > Configure Network (see Figure 6-5).

    FIGURE 6-5

    Figure 6-5 Replication Network Configuration

  • Step 3. In the Configure Replication Network dialog box, on the VLAN Configuration tab, enter the network information:

    • Select an existing VLAN: Click this radio button to add an existing VLAN(see Figure 6-6).

    • Create a new VLAN: If you select this radio button, the following fields become available (see Figure 6-7):

      • VLAN ID: A VLAN that is different from the HX Data Platform management traffic network and data traffic network

      • VLAN Name: The name of the VLAN

    FIGURE 6-6

    Figure 6-6 Existing VLAN Assignment for Replication Network

    FIGURE 6-7

    Figure 6-7 VLAN Creation for Replication Network

    • UCS Manager host IP or FQDN: The host IP address or FQDN for the UCS Manager

    • Username: The administrator username for Cisco UCS Manager

    • Password: The administrator password for Cisco UCS Manager

  • Step 4. Click Next.

  • Step 5. In the IP & Bandwidth Configuration tab, set the network parameters and the replication bandwidth (see Figure 6-8):

    • Subnet: The subnet for the replication network

    • Gateway: The gateway for the replication network

    • IP Range: The range of IP addresses for each converged node in the cluster plus one additional IP address (that is, N+1)

    • Add IP Range: Button for adding the specified IP range

    • Set replication bandwidth limit: The bandwidth that the replication network is allowed to consume

    • Set non-default MTU: MTU other than the default, which is 1500.

    FIGURE 6-8

    Figure 6-8 IP and Bandwidth Replication Settings

  • Step 6. Click Configure.

  • Step 7. In the Test Configuration tab, shown in Figure 6-9, check the replication network configuration.

    FIGURE 6-9

    Figure 6-9 Replication Network Test Configuration

4. Replication Pair Overview | Next Section Previous Section

Cisco Press Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from Cisco Press and its family of brands. I can unsubscribe at any time.


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about Cisco Press products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.


Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites; develop new products and services; conduct educational research; and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.


If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@ciscopress.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.


This site is not directed to children under the age of 13.


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.


Users can always make an informed choice as to whether they should proceed with certain services offered by Cisco Press. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.ciscopress.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020