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C H A P T E R 18 Server Load Balancing (SLB)
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enable slb failover
enable slb fail ping
configure slb vip site1 unit 1
configure slb vip site2 unit 2
configure slb fail ping-check 1.10.0.1 freq 1
The differences between the configurations of these two switches
are the IP addresses, and the designation of the first switch as the
master of the active-active configuration.
Using Manual Fail-Back
In an active-active configuration, fail-back is the action of releasing
the virtual servers that are assigned to a failed switch when that
switch becomes operational again. By default, fail-back occurs
automatically. If the minor disruption of fail-back makes automatic
fail-back undesirable, you can enable manual fail-back. With
manual fail-back, fail-back occurs only when the operator enters the
fail-back command.
To enable manual fail-back, use this command:
enable slb failover manual-failback
To execute a manual fail-back, use this command:
configure slb failover failback-now
Using SLB High Availability
Using SLB High Availability (SLB H/A) provides redundancy in
the case of an SLB service failure. Using SLB H/A, a site is
configured with multiple servers spanning two switches. All servers
are capable of responding to requests for content, but only those
servers connected to the active switch receive requests. The other
servers are idle or are used to serve another site.
Figure 18.7 shows an SLB failover configuration using SLB H/A.