From: Vincent Mashburn (vmashburn@fedex.com)
Date: Fri Nov 24 2006 - 15:03:04 ART
Congestion occurs when the hardware queue (tx-ring) is full. When you
enable QoS on a Serial interface, the tx-ring is automatically lowered
to 2, but this is not so for an Ethernet interface. What I do to
simulate congestion is police the traffic at the remote end to a low
rate. That simulates a large pipe flowing to a small pipe, hence
congestion. You can then get a good idea of what your configuration
will do in a congested environment.
Vince Mashburn
Sr. Voice / Data Engineer
901-263-5072
CCVP, CCNP
Cisco IP Telephony Support Specialist
Cisco IP Telephony Operations Specialist
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jay Hanke
Sent: Friday, November 24, 2006 10:16 AM
To: ccielab@groupstudy.com
Subject: LLQ and bandwidth on ethernet interface
[demime could not interpret encoding quoted-printable - treating as
plain text]
When defining bandwidth percentages in LLQ setting the bandwidth on a
given Ethernet interface will adjust the calculated bandwidth
proportionally. LLQ doesn't do anything until there is congestion. So
when does congestion occur if the bandwidth is set below the interface
rate? Does it occur when the interface utilization exceeds the
provisioned bandwidth or does congestion occur at the interface line
rate?
This is the scenario that I have in mind:
Router1 Ethernet port =3D=3D> 1 mb/s Ethernet bridge =3D=3D> Router 2
Ethern=
et
port
Jay
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