Ip Application Services Configuration Guide, Cisco Ios Xe Release 3S (Cisco Asr - Cisco ASR 1000 Series Configuration Manual

Feature Information for TCP
Feature Name
TCP Congestion Avoidance

IP Application Services Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR 1000)

44
Releases
12.3(7)T
Configuring TCP
Feature Information
The TCP Congestion Avoidance
feature enables the monitoring of
acknowledgment packets to the
TCP sender when multiple packets
are lost in a single window of data.
Before this feature was introduced,
the sender would exit
Fast-Recovery mode, wait for three
or more duplicate acknowledgment
packets before retransmitting the
next unacknowledged packet, or
wait for the retransmission timer
to start slowly. This delay could
lead to performance issues.
Implementation of RFC 2581 and
RFC 3782 addresses the
modifications to the Fast-Recovery
algorithm that incorporates a
response to partial
acknowledgments received during
Fast Recovery, improving
performance in situations where
multiple packets are lost in a single
window of data.
This feature is an enhancement to
the existing Fast Recovery
algorithm. No commands are used
to enable or disable this feature.
The output of the debug ip tcp
transactions command monitors
acknowledgment packets by
displaying the following
conditions:
• TCP entering Fast Recovery
mode.
• Duplicate acknowledgments
being received during Fast
Recovery mode.
• Partial acknowledgments
being received.
The following command was
modified by this feature: debug ip
tcp transactions.