Filter
Top Products
Configuring IP Services
Configuring TCP Performance Parameters
IPC-112
Cisco IOS IP Configuration Guide
The CEF and fast-switching aspects of the Express TCP Header Compression feature are related to these
documents:
• Cisco IOS Switching Services Configuration Guide
• Cisco IOS Switching Services Command Reference
For information about compressing RTP headers, see the chapter “Configuring IP Multicast Routing” in
this document.
Changing the Number of TCP Header Compression Connections
You also can specify the total number of header compression connections that can exist on an interface.
You should configure one connection for each TCP connection through the specified interface.
When specifying the total number of header compression connections that can exist on an interface, be
aware of the following conditions:
• By default, for Frame Relay encapsulation, there can be 256 TCP header compression connections
(128 calls). The maximum value is fixed, not configurable.
• By default, for PPP or HDLC encapsulation, the software allows 32 TCP header compression
connections (16 calls). This default can be increased to a maximum of 256 TCP header compression
connections.
To specify the number of connections, use the following command in interface configuration mode:
Setting the TCP Connection Attempt Time
You can set the amount of time the Cisco IOS software will wait to attempt to establish a TCP
connection. Because the connection attempt time is a host parameter, it does not pertain to traffic going
through the device, just to traffic originated at the device.
To set the TCP connection attempt time, use the following command in global configuration mode:
Enabling TCP Path MTU Discovery
Path MTU Discovery is a method for maximizing the use of available bandwidth in the network between
the endpoints of a TCP connection, and is described in RFC 1191. By default, this feature is disabled.
Existing connections are not affected when this feature is turned on or off.
Command Purpose
Router(config-if)# ip tcp
compression-connections number
Specifies the total number of TCP header compression connections that
can exist on an interface.
Command Purpose
Router(config)# ip tcp synwait-time seconds
Sets the amount of time the Cisco IOS software will wait to attempt to
establish a TCP connection.The default is 30 seconds.