The Packet Velocity ASIC (PVA) is a hardware acceleration chip that delivers high performance L4 throughput and Denial of Service (DoS) protection.

Full Acceleration (Full)

All traffic is load balanced using Layer 4 features, such as virtual servers that operate only on IP addresses and ports of incoming traffic. The Full acceleration mode is not compatible with Layer 7 features, such as cookie persistence, header insertion, and rules that operate on data payload content.

Partial Acceleration (Assisted)

The first packets in each connection are processed in software, and each packet thereafter is accelerated. This process allows the software to make decisions based on Layer 4 content, but accelerates the traffic once the load balancing or persistence determination has been made.

No Acceleration (None)

No traffic is accelerated.

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作者: reistlin
来源: http://www.reistlin.com/blog/273
更新时间: 2009.03
版权声明: 原创文章.转载请保留作者信息和原文完整.谢绝任何方式的摘要

[F5] 多链路负载均衡设备主要采用以下几种技术来处理 Outbound 流出流量。

Default Gateway Pool

在 Default Gateway Pool 中，定义相应的 ISP 对端路由器地址，作为负载均衡的对象，并且可以捆绑健康检查，负载均衡算法以及会话保持等属性。Default Gateway Pool 中 的Nodes 定义为多个 F5 多链路负载均衡设备的缺省路由。

For Example：

pool default_gateway_pool {
lb_method dynamic_ratio
member 100.1.1.1:0
member 200.1.1.1:0
}

Default Gateway Pool 中的 Nodes 为若干个下一跳路由器（Next Hop Router）的地址，用作 Outbound 负载均衡，可以通过三种方式生成。

1、Setup Utility 中配置多个 Gateway IP，用空格分开；
2、在 Configuration Utility 中 Link Configuration 下增加多个 Links；
3、在 Pool 中定义一个 Default Gateway Pool。

将 Default Gateway Pool 中的 Nodes 配置为 F5 多链路负载均衡器的 Default Gateway，可以通过 netstat -rn 命令查看路由表。

Destination  Gateway    Flags  MTU   If
default        100.1.1.1   UGS    1500  vlan2
default        200.1.1.1   UGS    1500  vlan3

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