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NE40E V800R010C00 Feature Description - NAT and IPv6 Transition 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
NAT Load Balancing Applications

NAT Load Balancing Applications

Typical Scenarios of Centralized NAT Load Balancing

In centralized NAT scenarios, the performance and bandwidth of a VSUF-80/160 cannot meet the processing requirements of a NAT instance. Therefore, another VSUF-80/160 needs to be added on the CR to support more bandwidth and session resources for the NAT instance. In Figure 3-32, after PC1 and PC2 go online successfully through CPE1 and CPE2 respectively, PC1 and PC2 use VSUF1 and VSUF2 respectively, on the CR to implement NAT during Internet access. This implementation achieves NAT load balancing.

In the centralized load balancing scenario, if the CPU of a VSUF fails and inter-chassis or inter-board backup is not deployed, user traffic is interrupted when it passes through the faulty CPU, and another load balancing member that is available takes over and performs NAT. When the faulty CPU recovers, some user traffic may be interrupted temporarily and then recover automatically.

Figure 3-32  NAT load balancing in centralized mode

Typical Scenarios of Distributed NAT Load Balancing

In distributed NAT scenarios, the performance and bandwidth of a VSUF-80/160 cannot meet the processing requirements of a NAT instance. Therefore, another VSUF-80/160 needs to be added on the BRAS to support more bandwidth and session resources for the NAT instance. In Figure 3-33, after PC1 and PC2 go online through the BRAS, PC1 and PC2 use VSUF1 and VSUF2 on the BRAS to implement NAT load balancing during Internet access.

In the distributed load balancing scenario, if the CPU of a VSUF fails and inter-chassis hot backup or inter-board backup is not deployed, users on the faulty CPU are logged out, and user traffic is interrupted. When the users redial up, they go online through another load balancing member that is available and NAT is performed.

Figure 3-33  NAT load balancing in distributed mode
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Updated: 2018-07-04

Document ID: EDOC1100027155

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