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NE20E-S V800R012C00SPC300 Configuration Guide - Network Reliability 04
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Configuring Manually Triggered Dual-Device ARP Hot Backup in VRRP Scenarios

Configuring Manually Triggered Dual-Device ARP Hot Backup in VRRP Scenarios

This section describes how to configure manually triggered dual-device ARP hot backup in VRRP scenarios.

Pre-configuration Tasks

Before configuring manually triggered dual-device ARP hot backup in VRRP scenarios, configure link layer protocol parameters for interfaces and ensure that the link layer protocol on each interface is Up.

Establishing a Dual-Device Backup Platform

This section describes how to establish a dual-device backup platform to back up user information between devices. This allows fast service switching if a network node or link fails, enhancing service reliability.

Prerequisites

Before binding an SSL policy to a TCP connection, configure an SSL policy and load a digital certificate. For detailed configuration procedure, see Configuring and Binding an SSL Policy.

Context

Dual-device backup provides a unified platform for backing up user information between devices in a VRRP group through a remote backup service (RBS) channel. This facilitates flexible control and management of user services and improves service continuity. Establishing a dual-device backup platform includes configuring basic Virtual Router Redundancy Protocol (VRRP) group functions, a remote backup service (RBS), and a remote backup profile (RBP).

Perform the following steps on both the master and backup devices:

Procedure

  • Configure basic VRRP group functions.
    1. Run system-view

      The system view is displayed.

    2. Run interface {interface-name | interface-type interface-number }

      The interface view is displayed.

    3. Run vrrp vrid virtual-router-id virtual-ip virtual-address

      A VRRP group is created on the interface, and a virtual IP address is assigned to the VRRP group.

    4. Run vrrp vrid virtual-router-id preempt-mode timer delay delay-value

      A preemption delay is set for devices in the VRRP group.

      In ARP dual-device hot backup scenarios, to ensure that the master device can completely back up ARP entries to the backup device, set a preemption delay greater than or equal to 600s for the devices in the VRRP group.

    5. Run admin-vrrp vrid virtual-router-id [ ignore-if-down ]

      The VRRP group is configured as an mVRRP group.

    6. Run vrrp vrid virtual-router-id priority priority-value

      A priority is configured for a device in the VRRP group.

    7. Run commit

      The configuration is committed.

  • Configure an RBP.
    1. Run system-view

      The system view is displayed.

    2. Run remote-backup-profile profile-name

      An RBP is created, and the RBP view is displayed.

    3. Run peer-backup hot

      A backup mode is configured for user information backup.

      The NE20E supports only dual-device hot backup for ARP services.

    4. Run vrrp-id vrrpId interface interface-type interface-number [ odd-mac | even-mac ]

      The RBP is bound to a specified VRRP group.

      The vrid parameter specifies the ID of a VRRP group. The ID must be the same as the VRRP group's ID configured using the vrrp vridvirtual-router-id [ virtual-ipvirtual-address ] command in the interface view.

    5. Run backup-id backup-id remote-backup-service service-name

      A backup ID is configured for the RBP, and the RBP is associated with a specified RBS.

      The backup-id parameter specifies a backup ID for an RBP. You can use a backup ID and an RBS to determine an RBP. The backup IDs configured for the same RBP must be the same on the master and backup devices and can no longer be configured for other RBPs.

    6. Run commit

      The configuration is committed.

  • Configure an RBS.
    1. Run system-view

      The system view is displayed.

    2. Run remote-backup-service service-name

      An RBS is created, and the RBS view is displayed.

    3. (Optional) Run bind ssl-policy ssl-policy-name

      An SSL policy is bound to a TCP connection.

      No security authentication mechanism is available for RBSs by default. It is recommended that you bind an SSL policy to a TCP connection to enhance RBS security.

    4. Run peer peer-ip-address source source-ip-address port port-id

      TCP connection parameters are set for the RBS.

      The source-ip-address and peer-ip-address parameters specify the IP addresses of the master and backup devices respectively. The IP addresses must have been configured on their own interfaces, sub-interfaces, or logical interfaces (such as loopback interfaces) and can ping each other.

      The port-id parameter specifies a TCP port number. The TCP port numbers configured on the master and backup devices must be the same.

    5. Run batch-backup service-type { arp | all | ipsec| bras | l2tp | multicast | igmp-snooping | dhcp-server | nd } now

      The device is enabled to immediately back up user services on the RBS.

      The multicast, l2tp, and bras parameters are supported only by the admin VS.

    6. Run commit

      The configuration is committed.

  • Configure a delay for disabling the forwarding function when the master device becomes the backup device.
    1. Run system-view

      The system view is displayed.

    2. Run peer-backup download-vrrp-table delay-timedelay-time-value

      A delay for disabling the forwarding function when the master device becomes the backup device is configured.

    3. Run commit

      The configuration is committed.

Enabling Remote Backup for ARP Services

This section describes how to enable remote backup for Address Resolution Protocol (ARP) services.

Context

Dual-device ARP hot backup prevents downlink traffic from being interrupted because the backup device does not learn ARP entries from a device on the user side during a master/backup VRRP switchover, which improves network reliability. After you establish a dual-device backup platform, enable remote backup for ARP services to ensure that ARP entries and host routing information are the same on the master and backup devices.

Perform the following steps on both the master and backup devices:

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run remote-backup-profile profile-name

    A remote backup profile (RBP) is created, and the RBP view is displayed.

  3. Run service-type arp

    Remote backup is enabled for ARP services.

  4. Run commit

    The configuration is committed.

Follow-up Procedure

Perform the following steps to bind the RBP to a specified interface or sub-interface so that remote backup can take effect for ARP services:

  1. Run the system-view command to enter the system view.

  2. Run the interface interface-type interface-number [.subinterface-number ] command to enter the interface or sub-interface view.

  3. Run the remote-backup-profile profile-name command to bind the RBP to the interface or sub-interface.

  4. Run the commit command to commit the configuration.

Verifying the Configuration of Manually Triggered Dual-Device ARP Hot Backup in VRRP Scenarios

After configuring dual-device ARP hot backup, verify the configurations.

Prerequisites

Dual-device ARP hot backup has been configured.

Procedure

  • Run the display remote-backup-profile [ profile-name ] command to check information about a specified remote backup profile (RBP).
  • Run the display remote-backup-service [ service-name [ verbose ] ] command to check information about a specified remote backup service (RBS).
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Updated: 2020-07-02

Document ID: EDOC1100146989

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