PLANET CS-2001 User Manual
Page 719
708
As seen from table 24-7, it can be inferred that when browsing www.nu.net.tw,
visitors are directed to different servers according to their browsing sequence.
The 1st user accesses the server via 61.11.11.11.
The 2nd user accesses the server via 211.22.22.22.
The 3rd user accesses the server via 211.22.22.22.
(Round-Robin priority distribution cycle finished)
The 4th user accesses the server via 61.11.11.11.
(Round-Robin priority distribution cycle has restarted)
The 5th user accesses the server via 211.22.22.22.
The 6th user accesses the server via 211.22.22.22.
When the 3rd user enters
and the weight priority of server 61.11.11.11
exceeds the original setting “1”, then the Inbound Load Balance will distribute the 3rd
user to the server 211.22.22.22 with weight priority of 2. When finished all the weight
priority allocation, the system will restart the weight priority distribution again. This
is how the load balancing mechanism can allocate the visitors to the web server
www.nu.net.tw in a round robin fashion according to the weighted and priority values.
As seen from table 24-8, the lower the priority value, the higher priority it gets. For
example, the user A wants to send an email to [email protected], a mail server
(hinet.net.tw) served as a SMTP server decides where and how to send the email by
inquiring the target DNS server. The MX record obtain from querying email.nu.net.tw
is shown below:
（Table 24-8）
Domain Name
Type
Address
Reverse
Weight
Priority
mail.nu.net.tw
MX
smtp1.nu.net.tw
X
--
1
mail.nu.net.tw
MX
smtp2.nu.net.tw
X
--
2
Table 24-8 MX Record of mail.nu.net.tw
A priority number of “1” represents the highest level of priority, therefore the server
will first try to deliver emails to smtp1.nu.net.tw. If the delivery fails, then the emails
will be directed to smtp2.nu.net.tw as it is the next highest priority.