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C H A P T E R 18 Server Load Balancing (SLB)
355
routing switch automatically changes the IP address and port
address on incoming packets to that of the load balanced servers. As
with any server load balancing application, the content must be
duplicated on all physical servers.
Configure port translation mode using this command:
create slb vip <vipname> pool <poolname> mode
port-translation <ipaddress>-
{<upper_ipaddress>}:<L4Port> {unit <number>}
GoGo Mode
As with any server load
balancing application, the
content must be duplicated
on all physical servers.
GoGo mode is considered a fast (line rate) method of server load
balancing. GoGo mode forwards traffic without manipulating
packet content. Session persistence is maintained using IP source
address persistence information.
Traffic is optimally
balanced across groups of
two, four, or eight directly
attached servers. Because
servers are always directly
attached, there is no need
to configure nodes, pools,
or VIPs.
To use GoGo mode, all servers are configured with the same MAC
and IP addresses. In GoGo mode, the load balancing method is
fixed, and is based on a hashing of the client IP address. All GoGo
mode traffic exhibits persistence based on source IP information.
That is, a given source address is mapped to one and only one
physical server.
Figure 18.3 shows GoGo mode.
Figure 18.3: GoGo mode
480T_040R
3421
7865
11 12109
13 161514
87654321
161514131211109
Rx TxRx TxRx TxRx Tx
Servers configured to use
same IP and MAC addresses
Server 1 192.168.200.1
MAC 00-00-00-CO-FF-EE
Server 2 192.168.200.1
MAC 00-00-00-CO-FF-EE
SLB switch Gogo-Mode configured
for ports 29-32
No other configuration necessary
Clients Servers
®