Specifications

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Cisco Wide Area Application Services Command Reference
OL-11817-01
Chapter 3 CLI Commands
(config) tfo auto-discovery
(config) tfo auto-discovery
To configure a WAE to automatically discover origin servers (such as those servers behind firewalls) that
cannot receive TCP packets with setup options and add these server IP addresses to a blacklist for a
specified number of minutes, use the tfo auto-discovery global configuration command. To disable TFO
auto-discovery, use the no form of this command .
tfo auto-discovery blacklist {enable | hold-time minutes}
Syntax Description
Defaults The default TFO auto-discovery blacklist hold time is 60 minutes.
Command Modes global configuration
Device Modes application-accelerator
Usage Guidelines Use the tfo auto-discovery blacklist hold-time command to adjust the blacklist hold time for the TFO
auto-discovery feature. With auto-discovery, the WAE keeps track of origin servers (such as those
servers behind firewalls) that cannot receive optioned TCP packets and learns not to send out TCP
packets with options to these blacklisted servers. When a server IP address is added to the blacklist, it
remains on the blacklist for the configured number of minutes. After the hold time expires, subsequent
connection attempts will again include TCP options so that the WAE can redetermine if the server can
receive them. Resending TCP options periodically is useful because network packet loss could cause a
server to be blacklisted erroneously.
Related Commands show statistics tfo
show tfo status
auto-discovery Specifies the TFO auto-discovery configuration.
blacklist Specifies the TFO auto-discovery blacklist server configuration.
enable Enables the TFO auto-discovery blacklist operation.
hold-time Specifies the maximim time to hold the blacklisted server address in the
cache.
minutes Number of minutes to hold the server blacklist entry. The range is 1–10080
minutes. The default is 60 minutes.