Allied Telesis Routers and Switches - Manual
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Table of Contents:
- Page 2 – What information will you find in this document?; As outlined above, the Note first describes; basic load balancer redundancy; Then the Note describes the optional extensions that let you; control server selection; Which products and software version does it apply to?; Rapier i Series switches
- Page 3 – Example of Basic Redundancy; Configure Load Balancer 1; Name the router
- Page 4 – Create a firewall policy.; Add the public and private interfaces to the firewall policy.; Configure the firewall
- Page 5 – Enable load balancing.; Add a resource pool for web traffic.; Configure VRRP
- Page 6 – allow; Configure triggers
- Page 7 – Configure Load Balancer 2; Load balancer 2 is identical to load balancer 1, except for its:
- Page 9 – Create the Scripts; ) and copy and paste the text of the script; load; command to download the files from the server.; Script for when a load balancer becomes the master:
- Page 10 – Extension: Controlling Server Selection; Configure Load Balancing: Extra Commands; affinity
- Page 11 – Configure the Triggers: Extra Commands; healthcheck; Modify the Scripts
- Page 12 – Create New Scripts; Script for when the preferred server goes down:
- Page 13 – Configuration Summary; Commands: Load Balancer 1
- Page 14 – Commands: Load Balancer 2
C613-16088-00 REV A
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How To|
Introduction
In many Server Hosting environments, two requirements are important: maximising
throughput availability to each ser vice, and minimising ser vice downtime. This How To Note
contributes towards both these aims.
The Note is split into two parts. The first part illustrates both redundancy of ser vers and
redundancy of the load balancers themselves. The second part provides an optional
extension that enables you to control ser ver selection without losing redundancy. This is
helpful when you prefer to have customers access a certain server, instead of balancing that
traffic. However, if that server fails, the customers need to use the alternate ser ver instead.
The examples
The network configuration for these examples is shown in the following figure.
The Note’s first example illustrates how to load balance web services, and includes:
•
Load balancing of incoming web traffic to maximise throughput to web servers. It also
provides redundancy if a web ser ver goes down.
•
Redundancy between two load balancing routers. In the unlikely event of a router going
down, a backup router takes over as master and continues the load balancing work for
incoming web connections. Load balancer redundancy and VRRP ensure that clients and
servers access the same public and private addresses no matter which router is the master.
•
A firewall to secure the LAN against attack. The firewall configuration changes
automatically if the backup router takes over the load balancing role.
Web/SFTP server 1
192.168.1.1
Web/SFTP server 2
192.168.1.2
private address
192.168.1.201
private
VLAN 3
with VRRP
virtual
address
192.168.1.202
public
VLAN 2
private address
192.168.1.200
public address
172.214.1.3
public address
172.214.1.4
redundancy
management
VLAN 4
192.168.2.2
redundant
load balancer
virtual address
172.214.1.2
Load Balancer 1
Load Balancer 2
client
redundancy
management
VLAN 4
192.168.2.1
public side
private side
lb-redundancy.eps
Configure Load Balancer Redundancy on Allied Telesis
Routers and Switches
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Summary
Configure Load Balancer Redundancy on Allied Telesis Routers and Switches 2 The Note’s second example extends the first example by showing how to control ser ver selection for SFTP (Secure File Transfer Protocol) traffic, while still providing ser ver redundancy if the preferred ser ver fails. For s...
Configure Load Balancer Redundancy on Allied Telesis Routers and Switches 3 Example of Basic Redundancy Configure Load Balancer 1 Name this router LB-1. set system name=LB-1 Create the three VLANs that this example uses: • VLAN 2 for the public Internet side create vlan=vlan2 vid=2 • VLAN 3 for the ...
Configure Load Balancer Redundancy on Allied Telesis Routers and Switches 4 Enable the firewall. enable firewall Create a firewall policy. create firewall policy=lb Set the firewall session timeouts for TCP, UDP and other packet types, in minutes. set firewall policy=lb tcptimeout=5 udptimeout=5 oth...
