Figure 12-5: Gslb Proximity Tables: How They Work - Nortel Web OS Switch Software Application Manual

Figure 12-5
which is forwarded to the master switch. The master switch looks through its proximity table
and returns the request to the DNS server with the virtual server IP address of the preferred
site. The DNS server sends a new request through the Internet and connects the client to the
preferred site.
4.CLIENT REQUEST FORWARDED
TO NEAREST LOCATION
1. CLIENT SENDS REQUEST
TO LOCAL DNS SERVER
Figure 12-5 GSLB Proximity Tables: How They Work
The following example illustrated in
GSLB proximity table. Two client networks, A and B, are configured in the proximity table on
the master switch at Site 4. Client A with a subnet address of 205.178.13.0 is configured with
static entries for preferred Sites 1 and 3. Client B, with a subnet address of 204.165.0.0, is con-
figured with static entries for preferred Sites 2 and 4.
212777-A, February 2002
illustrates GSLB proximity tables. The client sends a request to the DNS server,
2. DNS REQUEST
SENT TO MASTER
SWIT CH
DATABASE FIELDS
<IP ADDRESS> <NETMASK> <VIP>
Figure 12-6 on page 310
Chapter 12: Global Server Load Balancing
Web OS 10.0 Application Guide
3.MASTER
SWIT CH LOOKS AT
DATABASE AND RESPONDS
shows how to add entries into a
n
309