Cisco Cisco IOS Software Release 12.4(9)T

This document assumes that you already understand how to configure an IP access list and have one 
configured. 

Plan your network carefully so that no more than one Cisco IOS router in a given routing path has the 
Access List-Based RBSCP feature enabled. You do not want to recursively ACK split traffic.

The Access List-Based RBSCP feature will process only IPv4 packets, not IPv6 packets.

The feature will process only standalone TCP packets. Encapsulated (encrypted or tunneled) TCP 
packets will be left unprocessed.

This feature is available only on non-distributed platforms.

Before you configure an access list-based RBSCP, you should understand the following concepts:

The Access List-Based Rate-Based Satellite Control Protocol (RBSCP) feature provides the following 
benefits:

It allows you to selectively apply the TCP ACK splitting feature of RBSCP to any outgoing 
interface. TCP ACK splitting is a benefit because it reduces the effect of long latencies characteristic 
of satellite links. Applying this feature selectively by using an access list is a benefit because you 
control which packets are subject to TCP ACK splitting.

It has no tunneling or queueing overhead that is associated with RBSCP tunnels.

It provides more interoperability with other Cisco IOS features (such as TCP/IP header 
compresssion, DMVPN, and QoS) because the TCP and Stream Control Transmission Protocol 
(SCTP) packets are no longer encapsulated with an RBSCP/IP header. 

This feature works on process switched forwarding, fast switching, or CEF.

It preserves the internet end-to-end principle.