Implement Disaster Recovery

Overview

Disaster recovery adds another layer of redundancy to safeguard against network downtime. It responds to a cluster failure by handing off network management duties to a connected cluster (referred to as a site going forward). Disaster recovery implementation on Catalyst Center consists of three components: the main site, the recovery site, and the witness site.

At any given time, the main and recovery sites are operating in either the active or standby role. The active site manages your network while the standby site maintains a continuously updated copy of the active site's data and managed services. Whenever an active site goes down, Catalyst Center automatically initiates a failover, completing the tasks necessary to designate the former standby site as the new active site.

These topics provide information about how to set up and use disaster recovery in your production environment.

Key terms

Key terms for understanding disaster recovery implementation on Catalyst Center include:

  • Main Site: The first site you configure when setting up your disaster recovery system. By default, it operates as the active site that manages your network. For information about how to configure the sites in your system, see Set up disaster recovery.

  • Recovery Site: The second site you configure when setting up your disaster recovery system. By default, it acts as your system's standby site.

  • Witness Site: The third site you configure when setting up your disaster recovery system. This site, which resides on a virtual machine or separate server, is not involved with the replication of data or managed services. Its role is to give the current active site the quorum it needs to carry out disaster recovery tasks. This situation is known as a split-brain event, which can occur in a two-member system when the sites cannot communicate with each other. Each site thinks it should become active, which results in two active sites. Catalyst Center uses the witness site to arbitrate between the active and standby sites, allowing only one active site at any given time. For information about witness site requirements, see Prerequisites.

  • Register: To add a site to a disaster recovery system, you must first register it with the system by providing information such as your main site's VIP. When registering your recovery or witness site, you will also need to provide the token that is generated when you register your main site. For more information, see Set up disaster recovery.

  • Configure Active: The process of establishing a site as the active site, which involves tasks such as exposing the appropriate managed service ports.

  • Active site: The site that is currently managing your network. Catalyst Center continuously replicates its data to your standby site.

  • Configure Standby: The process of establishing a site as the standby site, which involves tasks such as configuring the replication of the active site's data and disabling the services which manage the network on the standby site.

  • Standby Ready: When an isolated site meets the prerequisites to become a standby site, Catalyst Center moves it to this state. To establish this site as your system's standby site, click Rejoin in the Action area.

  • Standby site: The site that maintains an up-to-date copy of your active site's data and managed services. If your active site goes down, your system initiates a failover and your standby site takes over as the active site.


    Note

    A message will indicate when you are currently viewing your system's standby site. You need to initiate all disaster recovery tasks from the active site.

  • Failover: Catalyst Center supports two types of failover:

    • System-triggered: As soon as your active site goes down, Catalyst Center detect this and automatically performs the tasks required to establish your standby site as the new active site. You can monitor these tasks from the Event Timeline.

    • Manual: You can initiate a manual failover to designate the current standby site as the new active site. For more information, see Initiate a manual failover.


    Important

    • After a failover, Assurance restarts and processes a fresh set of data on the new active site. Historical Assurance data from the former active site is not migrated over.

    • After a failover, the Catalyst Center inventory service triggers a full device sync. This can take anywhere from a few minutes to a few hours, depending on the number of devices that are managed. As is the case when Catalyst Center's normally scheduled device sync is running, you will not be able to provision devices on the newly activated cluster until the device sync triggered by a failover completes.

  • Isolate: During a failover, the former active site is separated from the disaster recovery system. Catalyst Center suspends its services and stops advertising its virtual IP address (VIP). From here, Catalyst Center completes the tasks necessary to establish the former standby site as the new active site.

  • Pause: Temporarily suspend your disaster recovery system in order to separate the sites that make up your system and stop data and service replication. For more information, see Pause your disaster recovery system.

  • Rejoin: From the Disaster Recovery > Monitoring tab, click this button in the Action area in order to add a Standby Ready or Paused site back into a disaster recovery system as the new standby site (after a failover has taken place). You would also click this button in order to restart a disaster recovery system that is currently paused.

  • Activate DR: User-initiated operation that creates your system's active and standby sites. This operation entails setting up intracluster communication, verifying that the sites meet disaster recovery prerequisites, and replicating data between the two sites.

  • Deregister: Click this button in the Action area to remove the three sites you have configured for your disaster recovery system. You must do so in order to make changes to any of the site settings you have entered previously.

  • Retry: In the Action area, click this button in order to reinitiate any action that failed previously.

  • VIP Promotion: When this option is enabled, the Enterprise interface VIP configured for your Catalyst Center deployment is promoted for use as your system's disaster recovery VIP. For more information, see the "VIP Promotion" section in Main site registration considerations.

Data replication overview

The data replication process syncs data between your disaster recovery system’s main site and recovery site. Its duration depends on a few factors: the amount of data that needs to be replicated, your network’s effective bandwidth, and the amount of latency that exists between the main and recovery sites. When disaster recovery is active for your Catalyst Center deployment, data replication will not impact any operations or application use on the current active site (which is managing your network).


Important

After a failover takes place, Assurance data from the site that failed is not replicated. The site that takes over as your system's active site will collect a new set of Assurance data.

Either a full or incremental replication of data takes place, depending on which of these scenarios is applicable:

  • After initial activation: After the initial configuration and activation of your disaster recovery system, the recovery site does not have any data. In this scenario, a full replication of data between the main and recovery sites happens.

  • After a failover: Whenever the current active site fails, the disaster recovery system triggers a failover. In this scenario, a full data replication between the main and recovery sites occurs after the failed site rejoins the system.

  • During normal operation: This scenario will typically apply to your system. During its day-to-day operation, changes that take place on the current active site are continuously synced with the current standby site.

Navigate the disaster recovery GUI

The table describes the components that make up Catalyst Center's disaster recovery GUI and their function.

Callout Description

1

Monitoring tab: Click to do the following:

  • View a topology of the sites that make up your system.

  • Determine the current status of your system.

  • Perform disaster recovery tasks.

  • View a listing of the tasks that have been completed to date.

2

Show Detail Information link: Click to open the Disaster Recovery System slide-in pane. See View disaster recovery system status for more information.

3

Topology: Displays either a logical or physical topology of your system that indicates the current status of your sites and their members.

  • In both the logical and physical topologies, a blue box indicates the site that's currently acting as your system's active site.

  • In the logical topology, a blue line indicates that the IPSec tunnel connecting two sites is operational, and a red line indicates that the tunnel is currently down.

  • To view a description of the possible site states, see System and site states.

4

Event Timeline: Lists every disaster recovery task that is currently in progress or has been completed for your system. For more information, see Monitor the event timeline.

5

Configure tab: Click to enter the settings necessary to establish a connection between your disaster recovery system's sites. See Set up disaster recovery for more information.

6

Logical and Physical tabs: Click the appropriate tab to toggle between a logical and physical topology of your system.

7

  • Status area: Indicates the current status of your system. To view a description of the possible system states, see System and site states.

  • Ongoing Data Replication area: Indicates the replication status of GlusterFS, MongoDB, and Postgres data between your system's sites. For more information, see Monitor managed services replication.

8

Legend: Indicates what the topology icons represent. To view the legend, click in the bottom right corner of the Disaster Recovery window.

9

Interactive Help button: Click to open a slide-in pane that provides links to walkthroughs that provide on-screen guidance to help you complete specific tasks in Catalyst Center.

10

Action area: Displays the disaster recovery tasks that are currently available for you to initiate. The tasks you can choose from vary, depending on whether you have configured your sites and your system's status.

View disaster recovery system status

The topology provides a graphical representation of your disaster recovery system's current status. If you want to view this information in a tabular format, you can do so in the Disaster Recovery System slide-in pane. To open this pane, do one of these tasks:

  • Click the Show Detail Information link. Then expand the site for which you want to view the status in the slide-in pane.

  • In the topology, place your cursor over a site's Enterprise virtual IP address or a particular node's icon. In the dialog box that opens, click the link in the bottom-right corner.

    The main site dialog box that displays the main site details link in the bottom-right corner.

    The slide-in pane opens and displays the relevant site information.

    The Disaster Recovery System slide-in pane that displays the site information.

Prerequisites

Before you enable disaster recovery in your production environment, ensure that the prerequisites are met.

Witness Prerequisites


Important

General Prerequisites

  • Catalyst Center supports two disaster recovery setups:

    • 1+1+1 setup: One Catalyst Center appliance functions as your Main Site, a second appliance serves as your Recovery Site, and a third system (residing on a virtual machine) acts as your Witness Site. These appliances and versions support this setup:

      • DN2-HW-APL (44-core second-generation appliance): Catalyst Center 2.2.2.x and later

      • DN3-HW-APL (32-core third-generation appliance): Catalyst Center 2.3.7.6 and later

      • DN2-HW-APL-L (56-core second-generation appliance): Catalyst Center 2.2.1.x and later

      • DN3-HW-APL-L (56-core third-generation appliance): Catalyst Center 2.3.7.6 and later

      • DN2-HW-APL-XL (112-core second-generation appliance): Catalyst Center 2.2.1.x and later

      • DN3-HW-APL-XL (80-core third-generation appliance): Catalyst Center 2.3.7.6 and later

    • 3+3+1 setup: One three-node Catalyst Center cluster functions as your Main Site, a second three-node cluster serves as your Recovery Site, and a third system (residing on a virtual machine) acts as your Witness Site. These appliances and versions support this setup:

      • DN2-HW-APL (44-core second-generation appliance): Catalyst Center 2.2.2.x and later

      • DN3-HW-APL (32-core third-generation appliance): Catalyst Center 2.3.7.6 and later

      • DN2-HW-APL-L (56-core second-generation appliance): Catalyst Center 2.1.2.x and later

      • DN3-HW-APL-L (56-core third-generation appliance): Catalyst Center 2.3.7.6 and later

      • DN2-HW-APL-XL (112-core second-generation appliance): Catalyst Center 2.1.2.x and later

      • DN3-HW-APL-XL (80-core third-generation appliance): Catalyst Center 2.3.7.6 and later

  • You have configured a VIP for the Enterprise port interface on your Catalyst Center appliances. This is required because disaster recovery uses the Enterprise network for intrasite communication. In the Catalyst Center Appliance Installation guide, refer to these topics:

    • For more information about the Enterprise port, see the "Interface Cable Connections" topic.

    • For more information about Enterprise port configuration, see either the "Configure the Primary Node Using the Maglev Wizard" or "Configure the Primary Node Using the Advanced Install Configuration Wizard" topic.

  • You have assigned a super-admin user to carry out disaster recovery tasks. Only users with this privilege level can access this functionality.

  • You have confirmed that the links connecting the following sites are 1 Gbps with at most 350 ms RTT latency.

    • Main and recovery sites

    • Main and witness sites

    • Recovery and witness sites


    Note

    Although a one Gbps link is recommended for connections with the witness site, the actual bandwidth the witness site uses is 50 Mbps. As long as the link speed is faster than this, you should not encounter any issues.

  • You have generated one third-party certificate and installed the same certificate on both the main and recovery sites. Otherwise, site registration fails.


    Note

    Catalyst Center copies this certificate to the witness site automatically during the registration process.

    Ensure that all of the IP addresses (especially the Enterprise port virtual IP address) and fully qualified domain names (FQDN) that the main and recovery sites use are included in this certificate. Also ensure that digitalSignature is specified for the certificate keyUsage parameter. For a description of how to generate a third-party certificate, see Generate a Certificate Request Using Open SSL in the Catalyst Center Security Best Practices Guide.

  • You have opened all of the ports listed in the Catalyst Center Security Best Practices Guide's "Disaster Recovery Ports" topic.

  • If you are using an FQDN-only certificate, ensure that the same cluster_hostname—that is, the FQDN for Catalyst Center (set in the Catalyst Center configuration wizard)—is configured on both the main and recovery sites, as well as Disaster Recovery VIP.

  • If your network resides behind a firewall, enable ICMP on the firewall. Catalyst Center periodically sends an ICMP ping to track connectivity between a disaster recovery system main, recovery, and witness sites.

Main and Recovery Site Prerequisites

  • Both your main and recovery site must consist of the same number of nodes. Catalyst Center does not allow you to register and activate a disaster recovery system that does not meet this requirement.

  • Both your main and recovery site must consist of Catalyst Center appliances that have the same hardware profile. For example, a site can consist of second-generation 112-core and third-generation 80-core appliances. This table lists the appliances that support disaster recovery and their corresponding Cisco part number:

    Table 1. Supported Catalyst Center appliances

    Machine Profile

    Machine Profile Alias

    		 Cisco Part Number Number of Cores

    medium

    medium

    First-generation:

    • DN1-HW-APL

    • DN1-HW-APL-U (promotional)

    44

    Second-generation:

    • DN2-HW-APL

    • DN2-HW-APL-U (promotional)

    Third-generation: DN3-HW-APL

    32

    t2_large

    large

    Second-generation:

    • DN2-HW-APL-L

    • DN2-HW-APL-L-U (promotional)

    56

    Third-generation: DN3-HW-APL-L

    t2_2xlarge

    extra large

    Second-generation:

    • DN2-HW-APL-XL

    • DN2-HW-APL-XL-U (promotional)

    112

    Third-generation: DN3-HW-APL-XL

    80

    Also ensure that your main and recovery site are running the same Catalyst Center version.

  • Catalyst Center 2.3.7.9 and later support mixed three-node clusters that have HA enabled. A valid mixed cluster meets these requirements:

    • It consists of second- and third-generation Catalyst Center appliances. First-generation appliances are not supported.

    • Its three appliances have the same machine profile. For example, a cluster with two second-generation large appliances and one third-generation large appliance is a valid mixed cluster.

  • You have configured and enabled high availability (HA) on both your main and recovery site. Otherwise, the registration of these sites fails. For more information, see the latest Catalyst Center High Availability guide.


    Important

    This is applicable to three-node setups only.

  • Ensure that the main and recovery site have the same Federal Information Processing Standards (FIPS) mode setting. If FIPS mode is enabled on one site and disabled on the other, the registration of your disaster recovery system fails because of a validation error. For more information on FIPS mode, see the description of the IP addressing mode used for the services screen (located in the Catalyst Center Appliance Installation guide's "Configure the Primary Node Using the Maglev Wizard" topic).

  • If you want to use Border Gateway Protocol (BGP) to advertise your system's virtual IP address routes, you need to configure your system's Enterprise virtual IP address on each of the main and recovery site's neighbor routers. The configuration you need to enter will look similar to one the following examples:

    Interior BGP (iBGP) Configuration Example

    router bgp 64555
 bgp router-id 10.30.197.57
 neighbor 172.25.119.175 remote-as 64555
 neighbor 172.25.119.175 update-source 10.30.197.57
 neighbor 172.25.119.175 next-hop-self

    where:

    • 64555 is the neighbor router local and remote AS number.

    • 10.30.197.57 is the neighbor router IP address.

    • 172.25.119.175 is your system Enterprise virtual IP address.

    Exterior BGP (eBGP) Configuration Example

    router bgp 62121
 bgp router-id 10.30.197.57
 neighbor 172.25.119.175 remote-as 64555
 neighbor 172.25.119.175 update-source 10.30.197.57
 neighbor 172.25.119.175 next-hop-self
 neighbor 172.25.119.175 ebgp-multihop 255

    where:

    • 62121 is the neighbor router local AS number.

    • 64555 is the neighbor router remote AS number.

    • 10.30.197.57 is the neighbor router IP address.

    • 172.25.119.175 is your system Enterprise virtual IP address.

  • If you enable BGP route advertisement (as described in the previous bullet), we recommend that you filter routes towards Catalyst Center in order to improve its performance. To do so, enter this configuration: 

    neighbor system's-Enterprise-virtual-IP-address route-map DENY_ALL out
!
ip prefix-list DENY_ALL seq 5 deny 0.0.0.0/0 le 32
!
route-map DENY_ALL permit 10
match ip address prefix-list DENY_ALL

Witness Site Prerequisites

  • You have confirmed that the virtual machine that hosts your witness site is running (at a minimum) VMware ESXi hypervisor version 7.0 or later with a 2.1-GHz core and two virtual CPUs, 4 GB of RAM, and 15 GB of hard drive space.

  • Confirm that the hostname of the witness site's VM contains a maximum of 20 characters. Configuration of the witness site and disaster recovery system might fail if the witness site's hostname exceeds this limit.

  • Witness site deployment in a public cloud is not supported.

  • You have set up your witness site in a different location than your main and recovery sites and confirmed that it is reachable from both of these sites.

  • You have configured an NTP server that is accessible by the witness site. You must synchronize this NTP server with the NTP servers that are used by the main and recovery sites.

  • The witness site utilizes approximately 50 Mbps of actual bandwidth. This bandwidth is used primarily for monitoring the connections (WAN, LAN, private circuits) between the witness site and the primary/standby sites.

Configure disaster recovery on an upgraded Catalyst Center appliance

To successfully configure disaster recovery after upgrading your system to the latest Catalyst Center version, complete these steps:

Procedure

Step 1

Install the witness site.

Step 2

Set up disaster recovery.

Add the disaster recovery certificate

Catalyst Center supports the import and storage of an X.509 certificate and private key into Catalyst Center. The disaster recovery certificate is used for intracluster communications.

You must obtain a valid X.509 certificate that is issued by your internal CA and the certificate must correspond to a private key in your possession.


Note

  • If you want your disaster recovery system to use the same certificate that Catalyst Center uses, you can skip this procedure. When you configure the certificate, make sure that you check the DR IPSec check box (see Update the Catalyst Center server certificate).

  • For more information about the disaster recovery certificate requirements, reference the Security Best Practices Guide.

Procedure

Step 1

From the main menu, choose System > Settings > Certificates > System Certificates.

Step 2

Open the Import Certificate slide-in pane by clicking Import Certificate.

Step 3

In the Add Certificate area, choose the file format type for the certificate that you are importing into Catalyst Center:

  • PEM: Privacy-enhanced mail file format

  • PKCS: Public-Key Cryptography Standard file format

Step 4

If you chose PEM, perform the following tasks:

  1. Import the certificate by dragging and dropping the PEM file into the highlighted area.

    Note

     

    A PEM file must have a valid PEM format extension (.pem). The maximum file size for the certificate is 10 MB.

    After the upload succeeds, the system certificate is validated.

  2. In the Private Key area, import the private key by dragging and dropping it into the highlighted area.

    Note

     

    Private keys must have a valid private key format extension (.key). The maximum file size for the private key is 10 MB.

    After the upload succeeds, the private key is validated.

  3. Specify whether the private key will be encrypted by clicking the appropriate radio button.

  4. If the private key will be encrypted, enter its password in the Password field.

Step 5

If you chose PKCS, do these tasks:

  1. Import the certificate by dragging and dropping the PKCS file into the highlighted area.

    Note

     

    A PKCS file must have a valid PKCS format extension (.pfx or .p12). The maximum file size for the certificate is 10 MB.

    After the upload succeeds, the system certificate is validated.

  2. In the Password field, enter the certificate's password (a PKCS requirement).

  3. Specify whether the private key will be encrypted by clicking the appropriate radio button.

  4. If the private key will be encrypted, enter its password in the Password field.

Step 6

Click Save.

After the Catalyst Center server’s SSL certificate is replaced, you are automatically logged out and you must log in again.

Install the witness site

Complete this procedure to set up the virtual machine to serve as the witness site for your disaster recovery system.

Procedure

Step 1

Download the OVF package that's specific to the Catalyst Center version that the witness site is running:

  1. Open https://software.cisco.com/download/home/286316341/type.

    Note

     

    You need a Cisco.com account to access this URL. See the following page for a description of how to create an account: https://www.cisco.com/c/en/us/about/help/registration-benefits-help.html

  2. In the Select a Software Type area, click the Catalyst Center software link.

    The Software Download page updates, listing the software available for the latest Catalyst Center release.

  3. Do one of these:

    • If the OVF package (*.ova) you need is already listed, click its Download icon.

    • Enter the relevant version number in the Search field, click its link in the navigation pane, and then click the Download icon for that version's OVF package.

Step 2

Copy this package to a local machine running VMware vSphere 7.0 or later.

Step 3

From the vSphere client, choose File > Deploy OVF Template.

Step 4

Complete the Deploy OVF Template wizard:

  1. Follow the instructions in the Source screen:

    1. Click Browse.

    2. Navigate to the witness site OVF package (.ova).

    3. Click Open.

    4. In the Deploy from a file or URL field, verify that the package path displays and then click Next.

      The OVF Template Details screen opens.

  2. Click Next >.

  3. Following the instructions in the Name and Location screen:

    • In the Name field, enter the name you want to set for the package.

    • In the Inventory Location field, select the folder that you want the package to reside in.

    • Click Next >.

    The Host/Cluster screen opens.

  4. Click the host or cluster on which you want to run the deployed template and then click Next >.

    The Storage screen opens.

  5. Click the storage drive for the virtual machine files to reside on and then click Next >.

    The Disk Format screen opens.

  6. Click the Thick Provision radio button and then click Next.

  7. Follow the instructions in the Network Mapping screen and then click Next:

    1. Click the IP address that is listed in the Destination Networks column.

    2. In the resulting drop-down list, choose the network that the deployed template should use.

    The Ready to Complete screen opens, displaying all of the settings that you have entered.

  8. Check the Power on after deployment check box and then click Finish.

  9. When the Deployment Completed Successfully dialog box opens, click Close.

Step 5

Enter the network settings for your witness site:

  1. Open a console to the virtual machine you just created by doing one of these tasks:

    • Right-click the virtual machine from the vSphere Client list and choose Open Console.

    • Click the Open Console icon in the vSphere Client menu.

    The Witness User Configuration window opens.

  2. Enter and confirm the desired password for the admin user (maglev), then press N to proceed.

  3. Enter these settings, then press N to proceed:

    • Its IP address

    • The netmask associated with the virtual machine IP address

    • The IP address of your default gateway

    • (Optional) The IP address of the preferred DNS server

  4. Enter one or more NTP server addresses or hostnames (separated by spaces), then press S to submit your settings and begin the configuration of the witness site.

    At least one NTP address or hostname is required.

  5. Verify that configuration has completed by using SSH port 2222 to log in to the IP address you configured for the witness site.

Note

 

Later, if you need to change the password configured for the maglev user on the witness site's VM, use the standard Linux passwd utility. You don't need to pause the disaster recovery system before doing this, and the password change will have no functional impact on disaster recovery operation.

Set up disaster recovery

Setting up disaster recovery in your Catalyst Center deployment is a two-step process. The first step is to register the sites that will comprise your disaster recovery system. The second step is to activate your system, enabling disaster recovery. Refer to this section's topics for a description of the steps you need to complete, as well as information on the errors you may encounter during this process and how to deal with them.

Main site registration considerations

Before you register your disaster recovery system's main site, you'll need to decide how to make use of the following features.

VIP Promotion

You'll need to decide whether you want to use the Enterprise interface VIP configured for your Catalyst Center deployment as your system's disaster recovery VIP. VIP promotion is suitable only if all of these items are applicable:

  • You have a brownfield deployment, where an existing Catalyst Center instance is managing the network and all devices are configured with the instance's Enterprise VIP. This instance will act as your disaster recovery system's main site.

  • The existing Enterprise interface VIP address is allowed to float between the two data centers where your main and recovery sites will reside. This is usually applicable in the case of an extended L2 network that spans multiple data centers.

  • You don't want the existing devices to be reconfigured when the new disaster recovery system's Enterprise interface VIP.

If you want to use VIP promotion, complete Steps 2b through 2e in Register the main site, clicking the Yes radio button in Step 2b.

Route Advertisement Options

You'll then need to decide the route advertisement option your deployment will use. One of disaster recovery's main objectives is to enable continuous network operation after a failover takes place without the need for device reprovisioning. This is achieved by specifying a floating VIP that's automatically configured on the disaster recovery system's current active site. Whenever a failover occurs, this VIP (referred to as the disaster recovery VIP in this chapter) is cleared from the previous active site and set on the new active site. This ensures that your network's devices can continue to communicate with Catalyst Center, regardless of which site is currently active. There are three route advertisement option to choose from when you complete Step 2g in Register the main site:

  • Border Gateway Protocol (BGP): This option, which is recommended for most disaster recovery systems, is selected by default. BGP route advertisement ensures that you can access your system's current active site, which is critical after a failover takes place.


    Important

    If you want to use this option, first complete the steps described in the last two bullets of the "Main and Recovery Site Prerequisites" section (which can be found in the Prerequisites topic).

  • Disaster recovery VIPs without route advertisement: Choose this option if you want to configure virtual IP addresses for your system whose routes are not advertised using BGP. This option is suitable for data centers where both the main and recovery sites can access the subnet that the system's global virtual IP addresses reside within.

  • No disaster recovery VIPs: When this option is selected, the virtual IP address that's configured for a site is automatically configured on the devices that belong to that site. Each time a failover takes place, this virtual IP address is reconfigured on the devices.

Register the main site

Complete this procedure to register your system's main site.

Before you begin

  • Ensure that you've reviewed Main site registration considerations.

  • On the Catalyst Center appliances or clusters where your disaster recovery system's main and recovery site will reside, do these tasks:

    • Configure the same backup schedule and proxy server. If you don't take care of this before you activate your system, you'll need to specify these two settings again after a failover occurs and the recovery site becomes the active site.

    • Configure an NFS backup configuration where each site points to a different NFS device.

Procedure

Step 1

From the main menu, choose System > Disaster Recovery to open the Disaster Recovery page.

On the Disaster Recovery window, the Monitoring tab is selected and the Disaster Recovery Topology is displayed with the status of Unconfigured.

The Monitoring tab is selected, by default.

Step 2

Register your main site:

  1. Click the Configure tab.

    The Main Site radio button should already be selected.

    On the Disaster Recovery window, the Configure tab is selected and the main site configuration options are displayed.

  2. In the Convert the cluster VIPs to the disaster recovery VIPs area, click one of these radio buttons:

    • Click Yes to set up a cluster as the main site and automatically propagate virtual IP address changes to the devices that are connected to this cluster. This is accomplished by promoting the virtual IP addresses that are currently configured for the cluster and assigning them as your disaster recovery system's global virtual IP addresses. We recommend choosing this option if you are enabling disaster recovery on a cluster that has a lot of connected devices. Otherwise, these devices will need to be reconfigured to communicate with the new disaster recovery virtual IP address. If you choose this option:

      1. In the New main site enterprise VIP field, enter a new virtual IP address for the site's Enterprise network. This will replace the address that is going to be promoted. Ensure that it is a unique address that is not already used and that it resides in the same subnet as the previous virtual IP address.

      2. (Optional) Check the Turn the cluster management VIP, <IP-address>, to the disaster recovery management VIP check box.

      3. (Optional) In the New main site management VIP field, enter a new virtual IP address for the site's Management network. This will replace the address that is going to be promoted. Ensure that it is a unique address that is not already used and that it resides in the same subnet as the previous virtual IP address.

    • Click No to set up a cluster as the main site without propagating virtual IP address changes to connected devices. We recommend this option for a brand-new cluster that isn't connected to any devices yet or is only connected to a few devices. If you choose this option, skip ahead to Step 2f.

  3. In the Action area, click Promote.

    The Disaster Recovery VIP Promotion dialog opens.

  4. Click Continue.

    Catalyst Center validates the virtual IP addresses you entered.

  5. In the Details area, view the validation status:

    • If any of the addresses you entered are invalid (likely because it doesn't reside in the same subnet as the address it's replacing), make the necessary corrections and repeat Step 2c.

    • If the addresses you entered are successfully validated, the Details area lists all of the virtual IP addresses that will be configured for your disaster recovery system. Proceed to the next step.

  6. Enter this information in the Site VIP/IPs area:

    • Main Site VIP: The virtual IP address that manages traffic between the active site's cluster nodes and your Enterprise network. Catalyst Center prepopulates this field, based on your system's information.

    • Recovery Site VIP: The Enterprise virtual IP address that manages traffic between the recovery site's cluster nodes and your Enterprise network.

    • Witness Site IP: The IP address that manages traffic between the witness site's virtual machine and your Enterprise network.

    Important

     

    Ensure that the addresses that you enter are currently reachable. Otherwise, the registration of your system's sites will fail.

    Note

     

    At any point between Steps 2f and Step 2j, you can click Reset to clear all of the settings that you have entered. You will then need to repeat Step 2f and enter the correct settings before you register the main site.

  7. Click one of these radio buttons in the Route advertisement area:

    • Border Gateway Protocol (BGP): This is the recommeded option.

    • Disaster recovery VIPs without route advertisement

    • No disaster recovery VIPs: Skip ahead to Step 2k if you click this radio button.

  8. If you clicked either of the first two radio buttons in the previous step, enter a value in the Enterprise VIP for Disaster Recovery field.

    When configured, this floating virtual IP address automatically moves to and operates on the site that is currently acting as your network's active site. This address manages traffic between your disaster recovery system and your Enterprise network.

    Note

     

    • If you clicked the Border Gateway Protocol (BGP) radio button and don't want to configure a Management virtual IP address, skip ahead to Step 2j.

    • If you clicked the Disaster recovery VIPs without route advertisement radio button and don't want to configure a Management virtual IP address, skip ahead to Step 2k.

  9. (Optional) Enter a value in the Management VIP for Disaster Recovery field.

    When configured, this floating virtual IP address automatically moves to and operates on the site that is currently acting as your network's active site. This address manages traffic between your disaster recovery system and your Management network.

  10. If you clicked the Border Gateway Protocol (BGP) radio button, enter the information required to enable route advertisement:

    • In the Border Gateway Protocol Type area, specify whether your BGP peers will establish exterior (Exterior BGP (eBGP)) or interior (Interior BGP (iBGP)) sessions with one another.

    • In the Main Site Router Settings for Enterprise Network and Recovery Site Router Settings for Enterprise Network areas, enter the IP address of the remote router that Catalyst Center will use to advertise the Enterprise virtual IP address that's configured for the disaster recovery system's Main and Recovery sites. Also enter the router's remote and local AS numbers.

      Note these points:

      • Click the Add (+) icon if you want to configure an additional remote router. You can configure a maximum of two routers for each site.

      • When entering an AS number, ensure that it's a 32-bit unsigned number that falls within the 1–4,294,967,295 range.

      • When the iBGP option is selected, Catalyst Center will automatically set the local AS number to the value you enter as the remote AS number.

      • If you configured a Management virtual IP address in the previous step, the Main Site Router Settings for Management Network and Recovery Site Router Settings for Management Network areas are also displayed. Enter the appropriate information for the remote router that Catalyst Center will use to advertise this virtual IP address.

  11. From the Action area, click Register.

    The Disaster Recovery Registration dialog opens.

  12. Click Continue.

    The token that your recovery and witness sites need to use in order to register with your main site is generated.

Step 3

In the Details area, click Copy Token.

On the Disaster Recovery window, the Monitoring tab is selected and the Disaster Recovery Topology is displayed with the status of Registering.

Main site registration errors

You may encounter errors when registering your system's main site. This topic describes these errors and how to deal with them.

Validation Type Validation Made Error Resolution

VIP reachability

Checks whether a TCP socket can be opened on the recovery site's port 443.

Make sure the recovery site's VIP matches the Enterprise VIP configured for the recovery site's Catalyst Center instance and that it's reachable from the main site.

Checks whether a TCP socket can be opened on the witness site's port 2222.

Make sure the witness site's IP address is configured correctly and reachable from the main site.

Enterprise and Management interface VIP reachability

Confirms whether the disaster recovery system's VIP can be reached via the Enterprise interface by looking for these items:

  • A static route defined on the Enterprise interface for the disaster recovery system's VIP

  • A default gateway configured on the Enterprise interface

If neither of these items are present, the validation fails.

Define either a static route on the Enterprise interface for the disaster recovery system's Enterprise VIP or a default gateway on the Enterprise interface.

Confirms whether the disaster recovery system's VIP can be reached via the Management interface by looking for these items:

  • A static route defined on the Management interface for the disaster recovery system's VIP

  • A default gateway configured on the Management interface

If neither of these items are present, the validation fails.

Define either a static route on the Management interface for the disaster recovery system's Management VIP or a default gateway on the Management interface.

Certificate upload

Confirms whether a third-party certificate has been uploaded. If so, Catalyst Center also confirms that the certificate is not self-signed.

In the System Certificates page (System > Settings > Certificates > System Certificates), checks that one of these is true:

  • The Use System Certificate for Disaster Recovery as well option is selected.

  • A certificate that's specific to disaster recovery has been uploaded.

In both cases, the certificate must have a nonwildcard DNS name specified as the first entry in its SAN field.

For errors not described above, their cause will be identified in the Status area. Make the necessary corrections and proceed by choosing one of these options from the Action area:

  • Retry: If the cause of the error is fixed or the error was caused by an intermittent issue (such as the restart of a dependent service during the registration process), try this option to continue registration.

  • Deregister: If you want to change any configuration or start over with the registration, use this option so that you can enter the details and options from the beginning.

Register the recovery site

Complete these steps to register the recovery site.


Note

At any point before Step 4, you can click Reset to clear all of the settings that you have entered. You will then need to repeat this procedure from the beginning and enter the correct settings before you register the recovery site.

Before you begin

View the Prerequisites topic and ensure that the requirements described in the "Main and Recovery Site Prerequisites" section have been met.

Procedure

Step 1

From the Details area, right-click the Recovery Site link and open the resulting page in a new browser tab.

Step 2

If necessary, enter the appropriate username and password to log in to your recovery site.

The Disaster Recovery page's Configure tab opens, with the Recovery Site radio button already selected.

On the Disaster Recovery window, the Configure tab and the Recovery Site radio button are selected.

Step 3

Enter this information:

  • Main Site VIP: The virtual IP address that manages traffic between the active site's cluster nodes and your Enterprise network.

  • Recovery Site VIP: The virtual IP address that manages traffic between the recovery site's cluster nodes and your Enterprise network. Catalyst Center prepopulates this field, based on your system's information.

    Note

     

    After a IPSec tunnel has been configured between the main and recovery sites, Enterprise traffic on the node(s) hosting the VIP will be sourced via the Enterprise VIP (UDP/TCP/ICMP).

  • The registration token that you generated while registering the main site.

  • The username and password configured for your active site's super-admin user.

Step 4

From the Action area, click Register.

The Disaster Recovery Registration dialog opens.

Step 5

Click Continue.

The topology updates the status for the main and recovery sites after they have been connected.

Register the witness site

Complete these steps to register the witness site.

Before you begin

Ensure that these conditions are true before you register your disaster recovery system's witness site:

  • The witness site is reachable from both the main and recovery site.

  • The VIPs configured for the main and recovery site are reachable from the witness site.

Procedure

Step 1

Return to the main site's browser tab.

On the Disaster Recovery window, the Monitoring tab is selected and the Disaster Recovery Topology is displayed with the Registering status.

Step 2

From the Details area, click Copy Witness Login Cmmd.

Step 3

Open an SSH console to the witness site, paste the command you just copied, and then run it to log in.

Step 4

When prompted, enter the default (maglev) user's password.

Step 5

Return to the Details area and click Copy Witness Register Cmmd.

Step 6

In the SSH console, paste the command you just copied.

Step 7

Replace <main_admin_user> with the super-admin user's username and then run the command.

Step 8

When prompted, enter the super-admin user's password.

Witness site registration errors

This topic describes errors you may encounter when registering the witness site and how to deal with them.

Error Type Validation Made Resolution

IP validation

Validates that the witness site IP address entered during main site registration matches the IP address entered during witness site registration.

Ensure that you enter the same IP address for the witness site when registering the main and witness sites.

Version validation

Validates that the witness site's OVA package is the correct version for the Catalyst Center version that's installed on your system's main and recovery sites. Each Catalyst Center version supports only one OVA version.

Deploy the witness site OVA package version listed in the error message.

For errors that don't involve validation checks, their cause is identified in the Status area. Make the necessary corrections and proceed by doing one of these tasks:

  • After logging in to the witness site, run the witness reset command.

  • To make any registration setting changes or restart the process from the beginning, click Deregister from the Action area.

Activate your disaster recovery system

After registering your system's sites, complete this procedure to activate the system for use in your Catalyst Center deployment.

Procedure

Step 1

Verify that your main, recovery, and witness sites registered successfully:

  1. Return to the main site's browser tab and click Monitoring to view the Disaster Recovery Monitoring tab.

    On the Disaster Recovery window, the Monitoring tab is selected and the Disaster Recovery Topology is displayed with the Registered status.

  2. In the Logical Topology area, confirm that the three sites are displayed and their status is Registered.

  3. In the Event Timeline area, confirm that the registration of each site is listed as an event and that each task completed successfully.

    The Event Timeline displays the witness site registration, recovery site registration, and main site registration details.

Step 2

In the Action area, click Activate.

A dialog box opens, indicating that all the data that currently resides in your recovery site will be erased.

Step 3

To begin the configuration of your disaster recovery system and the replication of your main site's data to the recovery site, click Continue.

Note

 

The activation process may take some time to complete. View the Event Timeline in order to monitor its progress.

Step 4

After Catalyst Center has completed the necessary tasks, verify that your system is operational:

  1. View its topology and confirm that the following status is displayed for your respective sites:

    The main site, recovery site, and witness site are displayed in the topology.

  2. View the Event Timeline and confirm that the Activate Disaster Recovery System task completed successfully.

    The Event Timeline displays the activate disaster recovery system details.

  3. Verify that your sites are reachable by pinging them from the main site.

Disaster recovery system validations

This table describes the validations that the disaster recovery system makes after the Activate and Rejoin operations have been initiated.

Validation Description
Package match

Confirms whether the packages installed on both the main and recovery sites are the same version.
Key services health

Checks the health of managed services and other key services that are critical for disaster recovery operations.
IPsec status and transmission

Confirms whether the IPSec tunnel is up for all of the disaster recovery system's sites.
Consul connectivity

Determines if the consul (the distributed database shared by the main, recovery and witness sites) is able to communicate with all of the sites.

Pause your disaster recovery system

By pausing your main and recovery sites, you are effectively breaking up your disaster recovery system. The sites will no longer be connected and instead will act as standalone clusters. You would want to pause your system to temporarily disable the replication of data from the active site to the standby site if you plan to break up your system for an extended period of time. You would also pause the disaster recovery system to do one of these tasks:

  • Complete any administrative tasks, such as upgrade the clusters or install additional packages.

  • Replace the system or disaster recovery certificate.

  • Perform maintenance on the main, recovery, or witness site clusters.

  • Prepare for a planned network or power outage.

Place your system on pause

To pause your disaster recovery system temporarily, which you would typically do before performing maintenance on a system component, complete this procedure:

Procedure

Step 1

From the main menu, choose System > Disaster Recovery to open the Disaster Recovery page.

The Monitoring tab is selected, by default, and displays your disaster recovery system's topology.

Step 2

In the Action area, click and then click Pause.

Step 3

In the resulting dialog, click Continue to proceed.

A message is displayed in the bottom-right corner of the page, indicating that the process to pause your system has started. To pause your system, Catalyst Center disables data and service replication. It also reinstates the services that were suspended on your recovery site. As this is taking place, the status for your main and recovery sites is set to Pausing in the topology.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the system topology. The main and recovery sites are in Pausing state.

After Catalyst Center completes the necessary tasks, the topology updates and sets the status for your main, recovery, and witness sites as Paused.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the system topology. The main and recovery sites are in Paused state.

Step 4

Confirm that your disaster recovery system has been paused:

  1. Verify that your system's status is listed as Paused in the Status area.

  2. In the Event Timeline, verify that the Pause Disaster Recovery System task completed successfully.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the Even Timeline with the Pause Disaster Recovery System task completed successfully.

Rejoin your system

Complete this procedure to restart a disaster recovery system that is currently on pause.

Procedure

Step 1

From the main menu, choose System > Disaster Recovery to open the Disaster Recovery page.

The Monitoring tab is selected, by default, and displays your disaster recovery system topology.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the system topology. The main and recovery sites are in Paused state.

Step 2

In the Action area, click Rejoin.

A dialog opens, indicating that all the data on your standby site will be erased.

Step 3

Click Continue to proceed.

A message is displayed in the bottom-right corner of the page, indicating that the process to reconnect your main, recovery, and witness sites has started. As this is taking place, the status for your main and recovery sites is set to Configuring in the topology.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the system topology. The main and recovery sites are in Configuring state.

After Catalyst Center completes the necessary tasks, the topology updates the status for your main, recovery, and witness sites.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the system topology after rejoining.

Step 4

Confirm that your disaster recovery system is operational again by verifying that its status is listed as Up and Running in the Status area.

Failovers: an overview

A failover takes place when your disaster recovery system's standby site takes over the responsibilities of the former active site and becomes the new active site. Catalyst Center supports two types of failover:

  • System-triggered: Occurs when your system's active site experiences an issue that brings it offline (such as a hardware failure or network outage). When Catalyst Center recognizes that the active site has not been able to communicate with the rest of the Enterprise network (and the standby and witness sites) for seven minutes, it completes the tasks necessary for your standby site to assume its role so that network operations can continue without interruption.

  • Manual: Occurs when a super-admin user instructs Catalyst Center to swap the roles that are currently held by your system's active and standby sites. You would typically do this before you update the Catalyst Center software that is installed on a site's appliances or perform routine site maintenance.

After either type of failover has taken place and the former active site has come back online, your disaster recovery system automatically moves the site to the Standby Ready state. To establish this site as the new standby site, click Rejoin in the Action area of the Monitoring tab.

Initiate a manual failover

When you manually initiate a failover, you instruct Catalyst Center to swap the roles that are currently assigned to your disaster recovery system's main and recovery site. Manual failover is useful if you know that the current active site is experiencing issues and you want to proactively designate the standby site as the new active site. Complete this procedure to initiate a manual failover.


Note

You cannot initiate a manual failover from your witness site. You can only do so from the current active site.

Procedure

Step 1

From the main menu, choose System > Disaster Recovery to open the Disaster Recovery page.

The Monitoring tab is selected, by default, and displays your disaster recovery system's topology. In this example, the user is logged in to the current active site.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the system topology.

Step 2

In the Action area, click Manual Failover.

The Disaster Recovery Manual Failover dialog opens, indicating that the standby site will assume the Active role.

Step 3

Click Continue to proceed.

A message is displayed in the bottom-right corner of the page, indicating that the failover process has started. The site previously acting as the active site is isolated from the system and enters the Standby Ready state.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the site previously acting as the active site in the Standby Ready state.

At this point, the main and recovery sites are not connected and data replication is not taking place. If the former active site is experiencing issues, now is a good time to resolve those issues.

A subsequent failover (initiated by either the system or a user) cannot take place until you add the former active site back to your disaster recovery system.

Step 4

Reconnect the main and recovery sites and reconfigure your disaster recovery system:

  1. Log in to your recovery site.

  2. In the Action area, click Rejoin.

A dialog opens, indicating that data on the standby site will be erased.

Step 5

Click Continue to proceed and restart data replication.

After Catalyst Center completes the relevant workflows, the manual failover completes. The main site, which was currently serving as the active site, is now the standby site.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the site previously acting as the active site in the standby state.

Step 6

Confirm that your disaster recovery system is operational again:

  1. In the top-right corner of the Monitoring tab, verify that its status is listed as Up and Running.

  2. In the Event Timeline, verify that the Rejoin task completed successfully.

    The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the Event Timeline with the Rejoin task completed successfully.

Deregister your system

After your disaster recovery system is activated, you may need to update the settings that you entered for a particular site. If you find yourself in this situation, complete this procedure.


Note

When you deregister your system, the settings that are currently set for all the sites in your system will be cleared.

Procedure

Step 1

From the Action area, click Pause to suspend the operation of your system.

For more information, see Place your system on pause.

Step 2

From the Action area, click Deregister.

Catalyst Center deletes all the settings that you configured previously for your system's sites.

Step 3

Complete the tasks described in Set up disaster recovery to enter the appropriate settings for your sites, reregister them, and reactivate your system.

Disaster recovery system considerations

This section describes things to be aware of when managing your disaster recovery system.

Backup and restore considerations

  • A backup can only be scheduled from your system's active site.

  • You cannot restore a backup file when disaster recovery is enabled. You must first pause your system temporarily. For more information, see Place your system on pause.

  • You should only restore a backup file on the site that was the active site prior to pausing your system. After you restore the backup file, you then need to rejoin your system's sites. Doing so will reinstate disaster recovery and initiate the replication of the active site's data to the standby site. For more information, see Rejoin your system.

  • You can only restore a backup file on cluster nodes that have the same Catalyst Center version installed as the other nodes in your system.

  • After a failover takes place, your deployment's backup and restore settings and schedule are not replicated to the new active site. You will need to configure them again.

  • If applicable to your deployment, we recommend that you upgrade the TLS version for incoming TLS connections to Catalyst Center. In the Catalyst Center Security Best Practices Guide, see the "Change the Minimum TLS Version and Enable RC4-SHA (Not Secure)" topic. If you have already upgraded your main site, we recommend that you also upgrade your recovery site (ideally before you activate your disaster recovery system or after a failover occurs).

Node or cluster replacement considerations

You cannot do either of these replacements without breaking your disaster recovery system's configuration:

  • Replace one of the nodes in a 1+1+1 setup.

  • Replace all of one site's nodes in a 3+3+1 setup.

If you need to do so, ensure that you then complete the steps described in Deregister your system to get your system up and running again.

Reconfiguration considerations

  • Any data present on the appliances that reside at the recovery site will be deleted in these scenarios:

    • When setting up your disaster recovery system for the first time and you activate the system.

    • When the recovery site is the current active site, you pause your system, deregister it, and then reregister it as the recovery site.

  • When you reconfigure an existing disaster recovery system, make sure you know which site is the current active site and register it as your system's main site. Alternatively, you can make a backup of the recovery site's data (if it's currently active) and restore this data on your system's main site prior to the system's reconfiguration.

  • These changes cannot be made without reconfiguring your system:

    • Changing the IP addresses and static/default routes configured for your disaster recovery system's Enterprise and Management interfaces.

    • Changing the witness site's IP address.

    • Updating a site's cluster_hostname setting.

    Complete the steps described in Deregister your system to configure new IP addresses and routes. If you updated the cluster_hostname value, complete these same steps after doing so.

HA considerations

You cannot convert the main and recovery sites from single-node clusters to HA clusters without breaking your disaster recovery system's configuration. If you need to do so:

  1. Deregister your system.

  2. Convert both sites to HA clusters.

  3. Reregister and reactivate disaster recovery (see Set up disaster recovery).

Site failure considerations

By default, the disaster recovery system waits seven minutes before recognizing that a site has failed and taking one of these actions:

  • When the active site goes down, it starts the failover process.

  • When either the standby or witness site goes down, the system marks that site as down and disables the ability to start any tasks from the Action area.

If you try to initiate a task before the seven minutes have passed, the Details area will display a message that indicates why it cannot be completed.

Certificate replacement considerations

The Status area indicates when the certificate configured for your disaster recovery system is set to expire. If the certificate will expire within 90 days, a warning message is displayed:

If the certificate will expire in 30 days or less, an error message is displayed instead:

If the certificate is set to expire in a day, and the disaster recovery system is operational, Catalyst Center automatically pauses your system:

To configure a new certificate and restore the operation of your system, you'll need to do these tasks:

  1. Place your disaster recovery system on pause (unless Catalyst Center has already done so).

  2. Replace your system's certificate by completing the steps described in the Add the disaster recovery certificate topic.

  3. Rejoin your system to restart it.

VLAN mode considerations

  • For a description of VLAN mode, see Steps 7 and 8 in the Cisco Catalyst Center Installation Guide's "Configure the Primary Node Using the Maglev Wizard" topic.

  • VLAN mode:

    • Can only be enabled when you configure a Catalyst Center appliance using the Maglev Configuration wizard.

    • Can't be enabled using any of the browser-based configuration wizards.

    • Can't be disabled without reimaging the appliance.

  • These items are not supported by Catalyst Center deployments that have VLAN mode enabled:

    • Catalyst Center in an ACI fabric

    • Disaster recovery

Administer your disaster recovery system

This section describes how to complete the various tasks you may need to carry out while managing your deployment's disaster recovery system.

Replace the current witness site

Complete this procedure to replace your disaster recovery system's current witness site with a new site.

Procedure

Step 1

Log in to the current witness site:

  1. Open an SSH console to the witness site and run the ssh -p 2222 maglev@witness-site's-IP-address command.

  2. Enter the default (maglev) user's password.

Note

 

Before you proceed to the next step, note the witness site's IP address. You'll need to configure the same address after you replace the witness site. Otherwise, the witness site won't work as expected.

Step 2

Run the witness reset command.

Step 3

Delete the current witness site's virtual machine.

Step 4

Install the new witness site's virtual machine, as described in Install the witness site.

Step 5

Log in to the new witness site:

  1. Open an SSH console to the witness site and run the ssh -p 2222 maglev@witness-site's-IP-address command.

  2. Enter the default (maglev) user's password.

Step 6

Run the witness reconnect -w witness-site's-IP-address -m main-site's-Enterprise-virtual-IP-address -u admin-username command.

Note these points:

  • Regardless of the main site's current disaster recovery status, use the main site's Enterprise VIP when reconnecting the witness site.

  • To verify that the witness site is operational after running this command:

    1. From the Disaster Recovery Topology, click the Show Detail Information link to open the Disaster Recovery System slide-in pane.

    2. In the Witness Site section, confirm that the status for the witness site and configured IPSec links is Up.

  • To view all of the available options for this command, run the witness reconnect --help command.

Upgrade the current witness site

Complete this procedure to upgrade the witness site that's currently configured for your disaster recovery system.


Important

This procedure is supported in Catalyst Center 2.3.7.5 onwards.

Procedure

Step 1

Download the witness site upgrade bundle that's specific to the Catalyst Center version that the witness site is running:

  1. Open https://software.cisco.com/download/home/286316341/type.

    Note

     

    You need a Cisco.com account to access this URL. See this page for a description of how to create an account: https://www.cisco.com/c/en/us/about/help/registration-benefits-help.html

  2. In the Select a Software Type area, click the Catalyst Center software link.

    The Software Download page updates, listing the software that's available for the latest Catalyst Center release.

  3. Do one of these tasks:

    • If the upgrade bundle you need is already listed (CatC-witness-2.3.7.10-upgrade.tar.gz, for example) , click its Download icon.

    • Enter the relevant version number in the Search field, click its link in the navigation pane, and then click the Download icon for that version's upgrade bundle.

Step 2

In an SCP client, copy the upgrade bundle from the host on which it was downloaded to the current witness site's virtual machine by running this command: scp -P 2222 upgrade-bundle-filename witness-site's-admin-username

Refer to this example:

$ scp -P 2222 CatC-witness-2.3.7.10-upgrade.tar.gz
maglev@10.30.197.96:/tmp/CatC-witness-2.3.7.10-upgrade.tar.gz
maglev@10.30.197.96's password:
CatC-witness-2.3.7.10-upgrade.tar.gz     100%  242MB 138.4MB/s  00:01

Step 3

In an SSH client, log in to the witness site's virtual machine and run the witness upgrade command, supplying values for these arguments:

  • -p, --password (TEXT): Admin password for the main system

  • -u, --username (TEXT): Admin username for the main system (required)

  • -m, --main_ip (IPV4_ADDRESS): Virtual IP address of the main system (required)

  • -w, --witness_ip (IPV4_ADDRESS): Witness site's IP address (required)

  • -b, --upgrade-bundle (TEXT): File system path to the upgrade bundle (required)

Refer to this example of what you'll see during an upgrade:

Note

 

If you're viewing this example in a browser window, you may need to press the Right Arrow key a few times to view the entire example. 

$ witness upgrade -b CatC-witness-2.3.7.10-upgrade.tar.gz -m 10.30.199.53 -w 10.30.197.96 -u admin
password for admin:
Retrieving information from the Disaster Recovery service on 10.30.199.53...
Inspecting upgrade bundle CatC-witness-2.3.7.10-upgrade.tar.gz...
Launching upgrade process in tmux session 'upgrade'...
Tailing the upgrade log /var/log/witness_upgrade.log...
upgrade_witness INFO witness upgrade process starting
[snip]
upgrade_witness INFO ***** Witness upgraded from version 2.1.714.837023 to 2.1.714.837024 *****
upgrade_witness INFO ***** Please reboot the witness VM
($ sudo reboot) to insure all updates are applied *****
upgrade_witness INFO ***** Then use the 'witness reconnect' command to re-establish witness connectivity *****
upgrade_witness INFO witness upgrade process completed successfully
Terminated
Witness upgrade invocation succeeded

Step 4

Do one of these tasks:

  • If the upgrade completes successfully, reboot the witness site's virtual machine to pick up all of the updated packages that were applied by running the sudo reboot command.

  • If you get an error during the upgrade, retry the operation.

Step 5

Log in to the new witness site:

  1. Open an SSH console to the witness site and run the ssh -p 2222 maglev@witness-site's-IP-address command.

  2. Enter the default (maglev) user's password.

Step 6

Run the witness reconnect -w witness-site's-IP-address -m main-site's-Enterprise-virtual-IP-address -u admin-username command.

Note these points:

  • Regardless of the main site's current disaster recovery status, use the main site's Enterprise VIP when reconnecting the witness site.

  • To verify that the witness site is operational after running this command:

    1. From the Disaster Recovery Topology, click the Show Detail Information link to open the Disaster Recovery System slide-in pane.

    2. In the Witness Site section, confirm that the status for the witness site and configured IPSec links is Up.

  • To view all of the available options for this command, run the witness reconnect --help command.

Monitor the event timeline

From the event timeline, you can track the progress of disaster recovery tasks that are currently running and confirm when these tasks have completed. To view the timeline:

  1. From the main menu, choose System > Disaster Recovery to open the Disaster Recovery page.

    The Monitoring tab is selected, by default.

  2. Scroll to the bottom of the page.

Every task that is in progress or has completed for your system is listed here (in descending order based on their completion timestamp), starting with the most recent task. Catalyst Center indicates whether each task was initiated by the system (Icon to indicate a task initiated by the system) or a user (Icon to indicate that the task was initiated by a user).

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the Event Timeline with the list of tasks that are in progress or complete.

Say you want to monitor the restoration of your system after it was paused. Catalyst Center updates the Event Timeline as each task in the restoration process is started and then completed. To view a summary of what took place during a particular task, click >.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the Event Timeline with the summary of changes in a particular task.

If the View Details link is displayed for a task, click it to view a listing of the relevant subtasks that were completed.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the Event Timeline with the View Details link clicked.

As with tasks, you can click > to view summary information for a particular subtask.

The Monitoring tab of the Cisco DNA Center Disaster Recovery window displays the Event Timeline with the summary of changes in a particular subtask.

See Troubleshoot your disaster recovery system for a description of the issues that you may encounter while monitoring the event timeline and how to remedy them.

Monitor managed services replication

After you activate your disaster recovery system, Catalyst Center begins monitoring the data replication status of the GlusterFS, MongoDB, and Postgres services. Whenever the replication of these services is taking place, the Status area displays one of these four messages:

  • Replication is completing as expected.

  • Replication is completing, but the data sync lag between your system's main and recovery site is currently 20 minutes or more.

  • Replication is completing, but the data sync lag between your system's main and recovery site is 30 minutes or more.

  • Replication has stopped.

These messages allow you to keep tabs on the replication of managed services, pointing out when network or system issues are impacting the sync of these services' data between your system's sites.

System and site states

In the disaster recovery GUI, the Status area indicates the current state of your system. This tables explain the various states that you may see for the individual sites in your system Topology.

Table 2. Active site states
State Description

Unregistered

Newly installed site. Disaster recovery information is not available yet.

Initializing

The site is preparing to transmit the data required by the other sites in order to set up the disaster recovery cluster during the registration process.

Initialized

The site has successfully prepared the data that it will transmit to the other sites in order to set up the disaster recovery cluster during the registration process.

Failed to Initialize

The site encountered an error while preparing to transmit the data required by the other sites in order to set up the disaster recovery cluster during the registration process.

Connecting Recovery

The main site is contacting the recovery site to retrieve the initialized data required to set up secure communication with the main site.

Connecting Witness

The main site is contacting the witness site to retrieve the initialized data required to set up secure communication with the main site.

Recovery Site Connected

The main site successfully established secure communication with the recovery site.

Failed to Connect Recovery

The main site encountered an error while establishing a secure channel with the recovery site.

Failed to Connect Witness

The main site encountered an error while establishing a secure channel with the witness site.

Registered

The active site successfully established secure communication with the other two sites.

Deregistering

Removing the current disaster recovery configuration from the system.

Deregister Failed

An error occurred while removing the current disaster recovery configuration from the system.

Validating

Validating the state of the system before starting the disaster recovery configuration.

Validated

Successfully validated the state of the system before starting the disaster recovery configuration.

Validation Failed

An error occurred while validating the state of the system before starting the disaster recovery configuration.

Configuring Active

Executing the workflows to establish this site as the active site.

Failed to Configure

An error occurred while running the workflows to enable disaster recovery on this site.

Syncing Config Data

Syncing the data required from the other sites to set up the disaster recovery system.

Config Data Synced

Successfully synced the data required from the other sites to set up the disaster recovery system.

Active Sync Failed

An error occurred while the pending active site was syncing the data required from the other sites to set up the disaster recovery system.

Waiting Standby Configuration

Successfully completed the workflows to establish this site as the active site; waiting for the standby site's workflows to complete.

Active

The site is successfully managing the network as the active site.

Failed to Configure

The site failed to execute some of the workflows that would enable itself as the active site in the disaster recovery cluster.

Isolating

The site is executing the workflows to isolate itself because it either lost connectivity with the other two sites or is preparing to become standby-ready (as part of a manual failover).

Isolated

The site has successfully executed the workflows to isolate itself because it either lost connectivity with the other two sites or is preparing to become standby-ready (as part of a manual failover).

Failed to Isolate

The site encountered an error while executing the workflows to isolate itself because it either lost connectivity with the other two sites or is preparing to become standby-ready (as part of a manual failover).

Configuring Active

Configuring a previous standby site as the active site (as part of a system-triggered or manual failover).

Failed during Failover

An error occurred while executing the workflows to establish this site as the active site (as part of a failover or recovery from a two-system failure).

Pausing Active

Executing the workflows that disable disaster recovery operations on the active site (in order to prepare for an administrative operation or a planned outage).

Active Paused

Successfully disabled disaster recovery operations on the active site.

Failed to Pause Active

An error occurred while disabling disaster recovery operations on the active site.

Active Stand Alone

Executing the workflows to establish a previous active site that lost connectivity with the other two sites as an independent system by removing all disaster recovery configurations.

Down

The active site has lost connectivity with the other two sites.
Table 3. Standby site states
State Description

Unregistered

Newly installed site. Disaster recovery information is not available yet.

Initializing

The site is preparing to transmit the data required by the other sites in order to set up the disaster recovery cluster during the registration process.

Initialized

The site has successfully prepared the data that it will transmit to the other sites in order to set up the disaster recovery cluster during the registration process.

Failed to Initialize

The site encountered an error while preparing to transmit the data required by the other sites in order to set up the disaster recovery cluster during the registration process.

Connecting Main

The recovery site is contacting the main site to retrieve the initialized data required to set up secure communication with the main site.

Connecting Witness

The recovery site is contacting the witness site to retrieve the initialized data required to set up secure communication with the main site.

Main Site Connected

The recovery site successfully established secure communication with the main site.

Failed to Connect Main

The recovery site encountered an error while establishing a secure channel with the main site.

Failed to Connect Witness

The recovery site encountered an error while establishing a secure channel with the witness site.

Registered

The standby site successfully established secure communication with the other two sites.

Deregistering

Removing the current disaster recovery configuration from the system.

Deregister Failed

An error occurred while removing the current disaster recovery configuration from the system.

Validating

Validating the state of the system before starting the disaster recovery configuration.

Validated

Successfully validated the state of the system before starting the disaster recovery configuration.

Validation Failed

An error occurred while validating the state of the system before starting the disaster recovery configuration.

Configuring Standby

Executing the workflows to establish this site as the standby site.

Failed to Configure

An error occurred while running the workflows to enable disaster recovery on this site.

Syncing Config Data

Syncing the data required from the other sites to set up the disaster recovery system.

Config Data Synced

Successfully synced the data required from the other sites to set up the disaster recovery system.

Standby Sync Failed

An error occurred while the pending standby site was syncing the data required from the other sites to set up the disaster recovery system.

Waiting Active Configuration

Successfully completed the workflows to establish this site as the standby site; waiting for the active site's workflows to complete.

Standby

The site is successfully configured as the standby site in the disaster recovery cluster.

Failed to Configure

The site failed to execute some of the workflows that would enable itself as the standby site in the disaster recovery cluster.

Isolating

The site is executing the workflows to isolate itself because it lost connectivity with the other two sites.

Isolated

The site has successfully executed the workflows to isolate itself because it lost connectivity with the other two sites.

Failed to Isolate

The site encountered an error while executing the workflows to isolate itself because it lost connectivity with the other two sites.

Configuring Standby

Configuring a previous active site as the standby-ready site (as part of a manual failover).

Standby Ready

A previous active system is ready to be configured as a standby system (as a result of a failover).

Pausing Standby

Executing the workflows that disable disaster recovery operations on the standby site (in order to prepare for an administrative operation or a planned outage).

Standby Paused

Successfully disabled disaster recovery operations on the standby site.

Failed to Pause Standby

An error occurred while disabling disaster recovery operations on the standby site.

Standby Stand Alone

Executing the workflows to establish a previous standby site that lost connectivity with the other two sites as an independent system by removing all disaster recovery configurations.

Down

The site has lost connectivity with the other two sites.
Table 4. Witness site states
State Description

Unregistered

Newly installed site. Disaster recovery information is not available yet.

Registered

This site has been designated as the witness site and the validation checks have completed successfully.

Up

Configuration of the witness site has completed successfully.

Down

The site has lost connectivity with the other two sites.

Upgrade a disaster recovery system

In this scenario, the first Catalyst Center version installed on your appliances was an earlier 2.1.x version and now you want to upgrade to the latest version. Also, disaster recovery is enabled and operational on these appliances. Complete these steps to complete the upgrade:

Procedure

Step 1

Place your system on pause.

Step 2

Upgrade the appliances at your main and recovery sites to the latest Catalyst Center version (see the Cisco Catalyst Center Upgrade Guide).

Step 3

Do one of these tasks:

Step 4

Rejoin your system.

Note

 

After upgrading to Catalyst Center 2.3.7 from version 2.3.4 or earlier, data migration takes place the first time a Rejoin operation is initiated. As a result, it will take longer for this operation to complete. The migration may add minutes or even hours to the completion time, depending on the amount of Catalyst Center data that's present. Keep in mind that this data migration only happens after an upgrade. This will not impact subsequent Rejoin operations.

During this one-time data migration from MongoDB to fileservice, you can ignore high disk utilization critical alerts for MongoDB. These alerts are temporary. After the Rejoin operation completes, the disk consumption decreases to expected values.

Disaster recovery event notifications

You can configure Catalyst Center to send a notification whenever a disaster recovery event takes place. See the "Work with Event Notifications" topic in the Cisco Catalyst Center Platform User Guide for a description of how to configure and subscribe to these notifications. When completing this procedure, ensure that you select and subscribe to the SYSTEM-DISASTER-RECOVERY-v2 event in the Platform > Developer Toolkit > Events table.


Important

Disaster recovery supports IPsec up/down notifications on a best-effort basis. When network disruptions prevent writing to the distributed store, some up/down notifications may be dropped. Event notifications resume after network communication is restored.

After you subscribe, Catalyst Center sends a notification indicating that the IPsec session is down because the system's certificate has expired. To update this certificate:

  1. Place your system on pause.

  2. On both your main and recovery site, replace the current system certificate. From the main menu, choose System > Settings > Certificates > System Certificates.

  3. Rejoin your system.

Supported events

This table lists the disaster recovery events that Catalyst Center generates notifications for when they take place.

System health status

Event

Notification

OK

The disaster recovery system is operational.

 Activate DR (Disaster Recovery Setup Successful)

OK

Failover to either the main or recovery site has completed successfully.

 Failover Successful

OK

Registration of the main site has completed successfully.

 Successfully Registered Main Site

OK

Registration of the recovery site has completed successfully.

 Successfully Registered Recovery Site

OK

Registration of the witness site has completed successfully.

 Successfully Registered Witness Site

OK

The disaster recovery system has been paused successfully.

 DR Pause Success

OK

The standby site is operational.

 Standby Site Up

OK

The witness site is operational.

 Witness Site Up

OK

The disaster recovery system has been unregistered successfully.

 Unregister Success

Degraded

Failover to either the main or recovery site has failed.

 Failover Failed

Degraded

Automated failover is not available because the standby site is currently down.

 Standby Cluster Down

Degraded

Automated failover is not available because the witness site is currently down.

 Witness Cluster Down

Degraded

Unable to place the disaster recovery system on pause.

 Pause Failure

Degraded

BGP route advertisement failed.

 BGP Failure

Degraded

The IPsec tunnel connecting your system's sites is operational.

 IPsec Up

Degraded

The IPsec tunnel connecting your system's sites is currently down.

 IPsec Down

NotOk

Disaster recovery system configuration failed.

 Activate DR Failure

NotOk

The site that is currently in the Standby Ready state is unable to rejoin the disaster recovery system.

Activate DR Failure

NotOk

Unregistration of the disaster recovery system failed.

 Unregistration Failed

NotOk

Registration of the main site failed.

 Main Registration Failed

NotOk

Registration of the recovery site failed.

 Recovery Registration Failed

NotOk

Registration of the witness site failed.

 Witness Registration Failed

Troubleshoot your disaster recovery system

This table describes issues that your disaster recovery system may present and ways to address them.


Note

If a disaster recovery operation fails or times out, click Retry to repeat the operation. If the problem persists and its solution is not provided in this table, contact Cisco TAC for assistance.

Table 5. Disaster recovery system issues
Error Code Message Solution

SODR10007

 Token does not match.

The token provided during recovery site registration does not match the token generated during main site registration. From the main site's Disaster Recovery > Configuration tab, click Copy Token to ensure that you copy the correct token.

SODR10048

 Packages (package names) are mandatory and not installed on the main site.

Install the listed packages before registering the system.

SODR10056

 Invalid credentials.

Confirm that you entered the correct credentials for the main site during recovery and witness site registration.

SODR10062

 () site is trying to () with invalid IP address. Expected is (); actual is ().

The main site IP address provided during recovery and witness site registration is different from the IP address that was provided during main site registration.

SODR10067

 Unable to connect to (recovery or witness site).

Verify that the main site is up.

SODR10072

 All the nodes are not up for (main or recovery site).

Check whether all three of the site's nodes are up.

SODR10076

 High availability should be enabled on (main or recovery) site cluster.

Enable high availability (HA):

  1. Log in to the site you need to enable HA on.

  2. From the main menu, choose System > Settings > System Configuration > High Availability.

  3. Click Activate High Availability.

SODR10100

 (Main or recovery) site has no third party certificate.

Replace the default certificate that Catalyst Center is currently using with a third-party certificate. See Update the Catalyst Center server certificate for more information.

SODR10113

 Save cluster metadata failed.

Contact Cisco TAC for help with completing the appropriate recovery procedure.

SODR10118

 Appliance mismatch between main () and recovery ().

The main and recovery sites use different appliances. To successfully register disaster recovery, both sites must use the same 56 or 112 core appliance.

SODR10121

 Failed to advertise BGP. Reason: ().

See Troubleshoot BGP route advertisement issues for more information.

SODR10122

 Failed to stop BGP advertisement. Reason: ().

See Troubleshoot BGP route advertisement issues for more information.

SODR10123

 Failed to establish secure connection between main () and ()().

No solution is available for this issue. Contact Cisco TAC for assistance.

SODR10124

 Cannot ping VIP: (main, recovery, or witness site's VIP or IP address).

Perform these actions:

  • Verify that the address specified is correct.

  • Check whether the address is reachable from the other addresses.

SODR10129

 Unable to reach main site. ()

Check whether the Enterprise virtual IP address configured for the main site is reachable from the recovery and witness sites.

SODR10132

 Unable to check IP addresses are on the same interface. Retry the operation. ()

Retry the operation you just attempted.

SODR10133

 The disaster recovery enterprise VIP () and the IP addresses () are not configured or reachable via the same interface. Check the gateway or static routes configuration.

The disaster recovery system's sites communicate over the Enterprise network. The main and recovery site's Enterprise virtual IP address and the witness site's IP address must be reachable through the Enterprise interface.

This error means that at least one site configures its IP address or virtual IP address with an interface other than the Enterprise interface.

SODR10134

 The disaster recovery management VIP (VIP address) and the IPs (IP addresses) are configured/reachable via same interface. It should be configured/reachable via management interface. Check the gateway or static routes' configuration.

Configure the disaster recovery system's management virtual IP address on the management interface. This error means the virtual IP address is currently set on an interface that does not have the management cluster's virtual IP address.

Add a /32 static route to the management virtual IP address configured on the management interface.

SODR10136

 Certificates required to establish IPsec session not found.

From the System Certificate page (System > Settings > Certificates > System Certificates), try uploading the third-party certificate again and then retry registration. If the problem persists, contact Cisco TAC for assistance.

SODR10138

 Self-signed certificate is not allowed. Upload a third-party certificate and retry.

—

SODR10139

 Disaster recovery requires first non-wildcard DNS name to be same in main and recovery. {} in {} site certificate is not same as {} in {} site certificate.

The third-party certificate installed on your main and recovery sites has different DNS names specified for your disaster recovery system. Generate a third-party certificate that specifies a DNS name for your system and upload this certificate to both sites.

Note

 

Ensure that the DNS name does not use a wildcard.

SODR10140

 Disaster recovery requires at least one non-wildcard DNS name. No DNS name found in certificate.

The third-party certificate installed on your main and recovery sites does not specify a DNS name for your disaster recovery system. Catalyst Center uses this name to configure the IPsec tunnel that connects your system's sites. Generate a third-party certificate that specifies a DNS name for your system and upload this certificate to both sites.

Note

 

Ensure that the DNS name does not use a wildcard.

—

—

When all three of your system's sites are not connected due to network partitioning or another condition, Catalyst Center sets the status of the sites to Isolated. Contact Cisco TAC for help with completing the appropriate recovery procedure.

—

 External postgres services does not exists to check service endpoints.

Perform these actions:

  1. Log in to the site that the error occurred on.

  2. Run the following commands:

    • Kubectl get sep -A

    • kubectl get svc -A | grep external

  3. In the resulting output, search for external-postgres.

  4. If present, run the following command: kubectl delete sep external-postgres -n fusion

  5. Retry the operation that failed previously.

—

 Success with errors.

If you see this message after initiating a failover or pausing your disaster recovery system, it indicates that the operation completed successfully even though one or multiple services encountered minor errors. You can go ahead and click Rejoin to restart your system. These errors will be resolved after you do so.

—

 Failed.

This message indicates that a disaster recovery operation failed because one or multiple services encountered a critical error. To troubleshoot the failure, we recommend that you view the Event Timeline and drill down to the relevant error. When you see this message, click Retry to perform the operation again.

—

 Cannot ping VIP: (VIP address).

Verify that the Enterprise VIP address configured for your system is reachable.

—

 VIP drop-down list is empty.

Confirm that your system's VIP addresses and intracluster link are configured properly.

—

 Cannot perform (disaster recovery operation) due to ongoing workflow: BACKUP. Please try again at a later time.

A disaster recovery operation was triggered while a scheduled backup was running. Retry the operation after the backup finishes.

—

 The GUI indicates that the standby site is still down after it has come back online.

If the standby site goes down and Catalyst Center's first attempt to isolate it from your disaster recovery system fails, it may not automatically initiate a second attempt. When this happens, the GUI will indicate that the site is down, even if it is operational again. In addition, you cannot restart your system as the standby site is stuck in maintenance mode.

To restore the standby site, do the following:

  1. In an SSH client, log in to the standby site.

  2. Run the maglev maintenance disable command to take the site out of maintenance mode.

  3. Log in to Catalyst Center.

  4. From the main menu, choose System > Disaster Recovery.

    The Monitoring tab is selected by default.

  5. In the Action area, click Rejoin in order to restart your disaster recovery system.

—

 Multiple services exists for MongoDB to check node-port label.

For debugging, the MongoDB node port is exposed as a service. Run the following commands to identify this port and hide it:

  • kubectl get svc --all-namespaces | grep mongodb

  • magctl service unexpose mongodb <port-number>

—

 Multiple services exist for Postgres to check node-port label.

For debugging, the Postgres node port is exposed as a service. Run the following commands to identify this port and hide it:

  • kubectl get svc --all-namespaces | grep postgres

  • magctl service unexpose postgres <port-number>

Two-site failure scenarios

A two-site failure occurs when at least two of your disaster recovery system's three sites go down at the same time or the sites have been partitioned. Refer to this table for a description of how Catalyst Center responds to the various failure scenarios and any user actions that need to be taken.

Failure scenario System and user response

Scenario 1: Two of your system's sites go down.

  1. The system isolates the site that's still online.

    Important

     

    Even if this operation fails, complete the first task described in Step 3 if you plan to operate this site as a standalone site.

  2. Log in to this site.

  3. If you want the site to operate as a standalone site, click Standalone and then click Continue in the resulting dialog box.

    Note

     

    If you choose this option and want to reestablish your disaster recovery system later:

    1. Reset the witness site by running the witness reset command.

    2. Log in to the other site that failed and click Standalone so that it also operates as a standalone site for the time being.

    3. Log in to the site that's still online and reconfigure your disaster recovery system. When you set this site to operate in standalone mode, the VIP configured for your system is deleted from the sites that went down. This step is key since it will reconfigure your system's VIP on these sites.

    If you don't want the site to operate as a standalone site, first bring the two sites that went down back up. Then do one of these tasks:

    • If the witness site remains offline, refer to the Scenario 3 system and user response.

    • If the standby site remains offline, refer to the Scenario 4 system and user response.

    • If the active site remains offline, refer to the Scenario 5 system and user response.

When a site enters standalone mode, the system automatically configures its virtual IP address for that site. It also advertises its virtual IP address routes to prevent network reprovisioning.

Scenario 2: The active, standby, and witness sites go down and come back online about the same time.

  1. The system isolates the active and standby sites.

  2. The system restores the active site and the standby site enters the Standby Ready state.

  3. You are notified that the system has recovered from a two-system failure.

    For confirmation, refer to the Event Timeline.

  4. Set up disaster recovery.

Scenario 3: The active, standby, and witness sites go down. The active and standby sites come back online while the witness site remains offline.

  1. The system isolates the active and standby sites.

  2. The system restores the active site and the standby site enters the Standby Ready state.

  3. You are notified that the system has recovered from a two-system failure.

    For confirmation, refer to the Event Timeline.

  4. Do one of these tasks:

Scenario 4: The active, standby, and witness sites go down. The active and witness sites come back online while the standby site remains offline.

  1. The system isolates and then restores the active site.

  2. You are notified that the system has recovered from a two-system failure.

    For confirmation, refer to the Event Timeline.

  3. After the former active site comes back online and enters the Standby Ready state, Set up disaster recovery.

    If you've determined that you need to replace the nodes at the standby site, instead:

    1. Log in to the witness site and run the witness reset command.

    2. Log in to the active site, click Standalone, and then click Continue.

    3. Replace the nodes at the standby site.

    4. If the witness site will use a virtual machine that's newer than the one that was used previously, complete the steps described in Install the witness site. Otherwise, proceed to the next step.

    5. Set up disaster recovery.

Scenario 5: The active, standby, and witness sites go down. The standby and witness sites come back online while the active site remains offline.

  1. The system isolates the standby site and then establishes it as the new active site.

  2. You are notified that the system has recovered from a two-system failure.

    For confirmation, refer to the Event Timeline.

  3. After the former active site comes back online and enters the Standby Ready state, Set up disaster recovery.

    If you've determined that you need to replace the nodes at the standby site, instead:

    1. Log in to the witness site and run the witness reset command.

    2. Log in to the active site, click Standalone, and then click Continue.

    3. Replace the nodes at the standby site.

    4. If the witness site will use a virtual machine that's newer than the one that was used previously, complete the steps described in Install the witness site. Otherwise, proceed to the next step.

    5. Set up disaster recovery.

Troubleshoot BGP route advertisement issues

Complete this procedure to troubleshoot the cause of a BGP route advertisement error.

Procedure

Step 1

Validate the BGP session's status on the Catalyst Center cluster:

  1. In the Event Timeline, confirm that the Starting BGP VIP advertisement task completed successfully (Activate Disaster Recovery System > View Details > Configure active > View Details).

    If the task failed, do the these task before going to Step 1b:

    1. Check whether the neighbor router that the error message indicates is up.

    2. Confirm that the neighbor router has connectivity with Catalyst Center. If it doesn't, restore connectivity. Then retry activating the new disaster recovery system or restarting a paused existing system.

  2. In the Catalyst Center GUI, view the disaster recovery system's Logical Topology and determine whether the neighbor router is currently active.

    If it's down, check whether the Catalyst Center cluster is configured as a BGP neighbor from the router's perspective. If it's not, configure the cluster as a neighbor. Then retry activating the new disaster recovery system or restarting a paused existing system.

  3. View the bgpd and bgpmanager log files by running these commands:

    • sudo vim /var/log/quagga/bgpd.log

    • magctl service logs -rf bgpmanager | lql

    When viewing the log files, look for error messages. If you can't find any, this indicates that the BGP session is functioning properly.

  4. Check the status of the BGP session between Catalyst Center and its neighbor router by running the echo admin-password| sudo VTYSH_PAGER=more -S -i vtysh -c 'show ip bgp summary' command.

    In the command output, look for the neighbor router's IP address. At the end of the same line, confirm that the output lists the router's connection state as 0. If so, this indicates that the BGP session is active and functioning properly.

Step 2

Validate the BGP session's status on the neighbor router indicated in the error message:

  1. Run the show ip bgp summary command.

  2. In the command output, look for the Catalyst Center cluster's virtual IP address. At the end of the same line, confirm that the output lists the cluster's connection state as 0. If so, this indicates that the BGP session is active and functioning properly.

  3. Run the show ip route command.

  4. View the command's output and confirm whether Catalyst Center is advertising the disaster recovery system’s Enterprise virtual IP address.

    For example, say your system's Enterprise virtual IP address is 10.30.50.101. If this is the first IP address that you see in the output, this confirms that Catalyst Center is advertising it.