Layer-4 Switch. You enable Layer 4 switch (or server load-balancers) support when you have multiple HP EFS WAN Accelerators in your network to manage large bandwidth requirements.
Hybrid. A hybrid deployment is a deployment in which the HP EFS WAN Accelerator is both in-path and out-of-path. A hybrid deployment is useful where the HP EFS WAN Accelerator must be referenced from remote sites as an out-of- path device (for example, to avoid mistaken auto-discovery or to bypass intermediary HP EFS WAN Accelerators). For detailed information, see Chapter 4, “Out-of-Path Network Deployments.”
WCCP. WCCP was originally implemented on Cisco routers, multi-layer switches, and Web caches to redirect HTTP requests to local Web caches (Version 1). Version 2, which is implemented on HP EFS WAN Accelerators, can redirect any type of connection from multiple routers or Web caches. For example, if you have multiple routers or it there is not a virtual place for the HP EFS WAN Accelerator, you can place the HP EFS WAN Accelerator to be virtually in-path through the router so that they work together. Typically, you configure WCCP on the client-side HP EFS WAN Accelerator. For detailed information, see Chapter 7, “WCCP Deployments.”
Policy-Based Routing (PBR). PBR enables you to redirect traffic to an HP EFS WAN Accelerator that is configured as an out-of-path device. PBR allows you to define policies to route packets instead of relying on routing protocols. You define policies to redirect traffic to the HP EFS WAN Accelerator and policies to avoid loop-back. For detailed information, see Chapter 6, “Policy-Based Routing Deployments.”
In-Path, Load Balanced, Layer-4 Switch
An in-path, load-balanced, Layer-4 switch deployment serves high traffic environments or environments with large numbers of active Transmission Control Protocol (TCP) connections. It handles failures, scales easily, and supports all protocols.
When you configure the HP EFS WAN Accelerator using a Layer-4 switch, you define the HP EFS WAN Accelerators as a pool where the Layer-4 switch redirects client and server traffic.
Only one WAN interface on the HP EFS WAN Accelerator is connected to the Layer-4 switch and the HP EFS WAN Accelerator is configured to send and receive data through that interface.
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