From: Chuck Church (cchurch@xxxxxxxxxxxx)
Date: Tue Aug 07 2001 - 23:44:27 GMT-3
At some point won't the router respond to the source with an ICMP source
quench? I've had many installations of 56kb WANs connecting 100mb LANs,
both IP and IPX. Almost never any queue drops. Since the hosts don't have
a problem with the relatively slow rate of packets coming in, something (one
of the routers) must be telling the sending host to throttle back, right?
Chuck
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Curtis Phillips
Sent: Tuesday, August 07, 2001 9:09 AM
To: Daniel C. Young; ccielab@groupstudy.com
Subject: RE: qos: reducing output buffer accumulation
While I suppose process switching the packets would result in a slower
output rate of packets, I have to say that I would never have thought of
that as a solution. Seems like a sort of non-sensical question. All of the
qos solutions to my knowledge would tend to buffer to avoid dropping
packets. With sliding windows and the tcp/ip stack working to cause
restransmission when necessary.
"Daniel C. Young" <danyoung99@mediaone.net> wrote:
>Group,
>
>Question #2 on Fatkid Lab 461:
>R4 and R2 are used to support WAN connections only for the Ethernet
network.
>Take corrective steps to limit the amount of packets that will accumulate
in
>the serial port output buffers, if the Ethernet segment is sending a great
>deal of traffic to R1.
>
>Solution:
>'no ip route-cache
>
>Explanation:
>Normally a Cisco router will do fast switching on an interface after
>processing the first packet in a data stream. Fast switching a type of
layer
>three switching, that allows Cisco routers to achieve very high performance
>without extremely high speed processors.? If you disable fast switching you
>slow the router down because every packet must be inspected by the CPU and
>routed conventionally.
>
>Isn't there a better way to do this? I was thinking of configuring CAR on
>the ethernet interface for incoming traffic, which will limit the rate of
>incoming traffic thereby reducing the amount of packets that will
accumulate
>on the slow link's serial interface buffers, such as:
>
>Interface Ethernet0
> traffic-rate input 64000 10000000
>
>Can I get any yeas or neas?
>
>Daniel C. Young
>Sr. Network Engineer
>CCNP (ATM, Security & Voice Specialist),
>CCDP, CCSE, MCSE+I
>
>SBC Internet Data Center
>(949) 221-1928 Work
>(714) 350-8945 Cell
>young@pobox.com
>**Please read:http://www.groupstudy.com/list/posting.html
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