Figure 12-6 Configuring Client Proximity Table - Nortel Web OS Switch Software Application Manual

Web OS 10.0 Application Guide
Client A, with a source IP address of 205.178.13.10, initiates a request that is sent to the local
DNS server. The local DNS server is configured to forward requests to the DNS server at Site
4. The Web switch at Site 4 looks up its proximity table and finds Client A prefers to connect
to Sites 1 or 3. Similarly, Client B's requests are always forwarded to Sites 2 or 4.
Client Site A
Prefers
Sites 1 and 3
Request
Site 1
Web Switch
IF: 1.1.1.1 / 24
Web
Servers
VIP: 1.1.1.100
Site 2
Web
Servers

Figure 12-6 Configuring Client Proximity Table

You can add static entries in the proximity table for up to 128 client networks.
N
OTE
can configure up to two preferred sites.
The Web switch forwards the client request based on the minimum available sessions and
response time between the two preferred sites.
n
310 Chapter 12: Global Server Load Balancing
205.178.13.0
Sites 2 and 4
DNS
DNS
Internet
DNS
Web Switch
IF: 2.2.2.2 / 24
VIP: 2.2.2.100
– Web OS allows you to configure a single domain only and for each client subnet you
Client Site B
204.165.0.0
Prefers
DNS
Request
DNS
Web Switch
IF: 4.4.4.4 / 24
VIP: 4.4.4.100
Site 3
DNS
Web Switch
IF: 3.3.3.3 / 16
VIP: 3.3.3.100
1. Client sites A and B send requests to
their DNS servers which are forwarded
to the master switch at Site 4.
2. The master switch looks through its
proximity table and responds to the
DNS request by providing the virtual
IP address of the preferred site.
3. The client sends out a new request
and connects to the preferred site.
Site 4
Web
Servers
Master switch returns
Client's request with the
VIP of the preferred site
Web
Servers
212777-A, February 2002