Enabling ARP Dual-Device Hot Backup in an E-Trunk Active-Active Scenario

ARP dual-device hot backup is configured. The E-Trunk protocol is configured. Dual-homing PEs on the access side are configured to work in active-active mode.

Usage Scenario

ARP dual-device hot backup is manually triggered to back up ARP entries if a link fails in an E-Trunk backup group, which prevents service interruptions in an E-Trunk active-active scenario.

Figure 1 ARP dual-device hot backup in an E-Trunk active-active scenario

Procedure

Create an RBS.
1. Run system-view
  The system view is displayed.
2. Run remote-backup-service remote-backup-service-name
  An RBS is created, and the RBS view is displayed.
3. Parameters of a TCP connection for the RBS are set.
  - On an IPv4 network, run:
```
peer peer-ip-address source source-ip-address port port-id
```
  - On an IPv6 network, run:
```
peer-ipv6  peerIpv6 source-ipv6 source-ipv6-address port port-id
```
4. Run quit
  Return to the system view.
Configure a dual-device E-Trunk backup platform.
1. Run e-trunk e-trunk-id
  An E-Trunk was created, and the E-Trunk view is displayed.
2. IPv6 addresses are configured for the source and peer ends of an E-Trunk link.
  - On an IPv4 network, run:
```
peer-address peer-ip-address source-address source-ip-address
```
  - On an IPv6 network, run:
```
peer-ipv6 peer-ipv6-address source-ipv6 source-ipv6-address
```
3. Run quit
  Return to the system view.
4. Run interface eth-trunk trunk-id
  An Eth-Trunk interface is created.
5. Run e-trunk e-trunk-id
  The Eth-Trunk interface is added to the E-Trunk interface.
6. Run e-trunk mode force-master
  The E-Trunk member interface is configured to work in the active state.
7. Run quit
  Return to the system view.
Configuring the remote backup profile (RBP).
1. Run remote-backup-profile profile-name
  The RBP view is displayed.
2. Run backup-id backup-id remote-backup-service service-name
  The RBP is associated with the RBS, and the user backup ID in the RBP is set.
  
  backup-id specifies a user backup ID. The user backup ID and RBS together identify an RBP. Note that the same user backup ID must be configured for devices that back up each other in the RBP. The user backup IDs in RBPs cannot be identical.
3. Run service-type arp
  Remote backup is enabled for ARP services.
4. Run e-trunk e-trunk-id eth-trunk eth-trunk-id
  The E-Trunk master/backup protocol is configured, and the E-Trunk link is bound to the RBP.
5. Run quit
  Return to the system view.
Bind the RBP to the Eth-Trunk interface.
1. Run interface eth-trunk trunk-id
  The view of the created Eth-Trunk interface is displayed.
2. Run remote-backup-profile profile-name
  The RBP is bound to the Eth-Trunk interface.
Run commit
The configuration is committed.