Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 100)

84 Brocade Virtual ADX Server Load Balancing Guide
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Disabling or deleting VIPs and real ports
2
Table 9 describes the behavior of the Brocade Virtual ADX for a specified action when it is
configured with the server force-delete command, with a port hold-down timer configured and in a
normal scenario without either configured.
Behavior with flapping ports
If a port keeps flapping within the configured port holddown timeout period, the port is held down
until the port stops flapping for the configured timeout. In practice this means that the port must
be available for a time interval greater than the configured timeout period for it to come back up.
NOTE
If a port that was disabled when the holddown timer is started is enabled within the timeout period,
the port is held down until the timeout period has passed.
The port hold down timer can be configured globally, per real server port and per port-profile.
Changing the default port holddown timer value
The default holddown timeout is 2 minutes. The following command allows you to configure this
global timeout value or reset the timeout to the default.
Virtual ADX(config)#server port-holddown-timeout 240
Syntax: [no] server port-holddown-timeout timeout-value
The timeout-value variable specifies the length of the port holddown timer in seconds. Acceptable
values are 1 second to 86400 seconds (1 day). The default value is 120 seconds (2 minutes).
The value set by this command applies to all port holddown configurations.
Enabling the port holddown timer globally
You can configure the port holddown timer globally to enable port hold down for all ports on all real
servers. This setting overrides any configurations for individual ports.
Virtual ADX(config)#server port-holddown
Syntax: [no] server port-holddown
TABLE 9 Behavior with server force-delete command
Action Normal Scenario With Force-Delete With Port Hold-down
Delete Real Server Sessions deleted within 2
minutes. Sessions deleted
within 2 minutes. If real server is re-added, it is
treated as a new server addition
and port isn’t held down.
Unbind Port Sessions deleted within 2
minutes. Sessions deleted
within 2 minutes. If re-bound, the port is not held
down.
Disable Real Server
Port Existing sessions continue to
exist through their lifetime. Sessions deleted
within 2 minutes. If enabled quickly (within the
timeout) the port is held down.
Real Port Fails Existing sessions continue to
exist through their lifetime. Sessions deleted
within 2 minutes. If the port comes up quickly, the
port is held down.