[nsp] CAR

[Duane de Witt]

Hi

Have you considered running WRED?

Regards
Duane
-----Original Message-----
From: Volodymyr Yakovenko [mailto:vovik at dumpty.org] 
Sent: Thursday, February 20, 2003 7:30 PM
To: cisco-nsp at puck.nether.net
Subject: [nsp] CAR

Hello!

 I have had an argument with Cisco engineer (sorry, no names) concerning
 shaping issues recently. 

 The engineer states that applying CAR-limits to transit IP traffic is
enough 
 good to effectively slow down TCP sessions speed.

 According to

http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a0080
0a3a25.shtml

 and RFCs such point of view is questionable.

 Does anyone know any good information sources which investigate current TCP

 stack's ability to recover after sudden packet loss (caused by CAR) without
 explicit congestion notification (ICMP source quench)?

 I would be most grateful for some numbers which show channel usage
efficiency 
 with and without explicit congestion notification in different situations.

 Could someone familiar with CSS comment - does CSS support any new kind of
 shaping/limiting capabilites comparatively to traditional IOSes?  

-- 
Regards,
Volodymyr.

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