Coyote Point Systems Equalizer Especificações descarregar pdf (Página 113)

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Source Based Routing Scenarios

Source routing allows the originator of a packet to partially or completely specify the path that a packet will take

through a network, as well as the return path. In contrast, non-source-routing devices determine that path based on

the packet’s destination. Source routing allows:

l Easier troubleshooting

l Improved traceroute

l Enables a node to discover all the possible routes to a host.

l Allows a source to directly manage network performance by forcing packets to travel over one path to

prevent congestion on another.

Source routing requires careful management by the administrator when building the source address selection and

source routing tables to ensure a coherent overall routing strategy. For this reason, it is often called

policy routing

since routing behavior is determined by a collection of routing tables built by the administrator.

Source Selection

As a load balancing device Equalizer may change the source address in a packet, the destination address in a

packet, or both, before sending a packet on to the next-hop gateway. In doing so, Equalizer will perform source

address selection to determine the appropriate source address to use when a packet is sent out on the network. In

previous Equalizer versions, only a single system-wide default source address was used.

Equalizer is frequently required to choose from a number of possible source addresses when sending packets. An

example is when Equalizer sends a probe to a server behind it. Some servers will be on a network that is local to

Equalizer, and so Equalizer will chose its IP address on the appropriate VLAN to use as the source address in a

probe packet. If the server is not located on a network that is local to Equalizer, then Equalizer will consult the

source address selection table to choose a source address, and route the packet according to the information in

the source routing table.

Refer to "Network Configuration" on page 77for a detailed discussion of VLANs and configuration with Equalizer.

The figure below shows the general flow of a packet through Equalizer, demonstrating the various check points

and destination selection techniques that are used. In "Source Routing Scenarios" on page 115 practical scenarios

are presented in “Road Map” style to demonstrate the routing selection used.

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Equalizer Administration Guide

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