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NE40E V800R010C00 Feature Description - NAT and IPv6 Transition 01

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NAT Backup

NAT Backup

Backup Between Service Boards on a Single NAT Device

When a NAT device has multiple service boards, active and standby service boards can be configured on the NAT device for backup. The standby service board synchronizes data from the active service board so that it can take over services immediately when the active service board fails. Services are not interrupted during the switchover, and users do not know the fault. The active/standby status of the members in an HA backup group on a single NAT device is statically configured.

NE40Es implement single-device inter-board hot backup.

Inter-board hot backup enables the primary and secondary service boards to back up NAT user entries and session entries for each other. If the primary board fails, a primary/secondary service board switchover can be performed to reestablish NAT session entries, preventing NAT service interruptions.

Inter-chassis Backup

If multiple NAT devices equipped with VSUF-80s or VSUF-160s exist on a network, you can configure a service board on a master device and a service board on a backup device to implement inter-chassis backup. Currently, NE40Es support inter-chassis cold backup and inter-chassis warm backup and hot backup. For details, see NAT Reliability - Inter-chassis hot Backup..

NAT cold backup supports fault association to fit high reliability requirements. In the event of a NAT board fault, NE40Es can get aware of the fault and automatically switches services to the backup device

As shown in Figure 3-18, NAT cold backup is deployed on NAT device A and NAT device B, and NAT services are running on NAT device A in normal situations. In the event of a NAT board fault, NAT device A gets aware of the fault and switches traffic to NAT device immediately.

Figure 3-18  NAT inter-chassis cold backup
Updated: 2018-07-04

Document ID: EDOC1100027155

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