Specifications

3-543

Cisco Wide Area Application Services Command Reference

OL-16451-01

Chapter 3 CLI Commands

(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}

no 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 TCP packets with options 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.

Examples The following example shows how to enable TFO auto-discovery blacklist using the tfo auto-discovery

command:

WAE(config)# tfo auto-discovery blacklist enable

Related Commands show statistics tfo

blacklist Specifies the TFO auto-discovery blacklist server configuration.

enable Enables the TFO auto-discovery blacklist operation.

hold-time minutes Specifies the maximum time to hold the blacklisted server address in the

cache. The range is 1–10080 minutes. The default is 60 minutes.