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Geographic Load Balancing with Envoy

Equalizer Installation and Administration Guide 151

Envoy site that sent the geographic probe (Site A). This provides more accurate client location

information to Envoy in the case where a resource is available at more than one site. Envoy will

choose the site that will best serve the client according to the latency information received.

3. The site that sent the geographic probe, Site A, returns the address of the best Envoy site to the

requesting client’s local DNS (see Figure 70).

Figure 70 The client’s local DNS receives the best Equalizer site

4. The selected Equalizer uses the information gathered from probing each site to determine the

site that is best able to process the request for the client and then forwards the request to that

site (see Figure 71). This site then responds to the client and the connection is thereafter

managed by the chosen site (in our example, Site B).

Figure 71 Site B handles the client’s connection

Envoy Site B

(West Coast USA)

Envoy Site A

(East Coast USA)

Internet

Envoy Site C

(Europe)

Client

(California, USA)

Client’s

Local DNS

DNS

Authoritative

DNS

for

coyotepoint.com