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NE40E V800R010C00 Feature Description - NAT and IPv6 Transition 01

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NAT64 Backup

NAT64 Backup

NAT64 backup is used to back up service information on service processing boards (namely, service boards) equipped on a NAT64 device. The information backup helps prevent network or service interruptions resulted from device or link faults. NAT64 backup helps improve device availability and service reliability, which improves the stability of carrier networks.

Backup Between Boards on a Single Device

The location of a NAT64 device on the network is important and does not allow network interruption due to a single point of failure (on a board). Services on the NAT64 device must run properly.

In most cases, two boards are configured for a NAT64 instance for high reliability. The CPU on one board is the active CPU, while the CPU on the other board is the standby CPU. Hot standby is implemented. The active board processes NAT64 services from users. If a fault occurs on the active board, the standby board takes over the services processing on the active boards.

The hot standby mechanism ensures data consistency between the active and standby boards. If a fault occurs on the active board, the system automatically performs an active/standby switchover and the standby board takes over services on the active boards. This ensures proper running of services and users cannot detect the fault.

Backup Between Device Chassis

All hosts on an internal network are configured with the same default route destined for an egress gateway (NAT64 device). This default route allows the hosts to communicate with external networks. If a single point of failure (on a device) occurs on the egress gateway, the hosts fail to communicate with external networks.

To prevent network interruption due to the fault on a device, perform the active/standby redundancy design. The active and standby devices are determined after VRRP is configured between the devices. After users get online from the active device, the device processes NAT64 services. If a fault occurs on the active device or its link, the standby device quickly becomes the active device and processes NAT64 services. When BFD is deployed between the active and standby devices, the speed of VRRP fault detection is improved, implementing millisecond-level switchover so that users cannot detect the fault.

Updated: 2018-07-04

Document ID: EDOC1100027155

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