From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Sat Nov 25 2006 - 00:07:03 ART
Hi Jay,
The LLQ or "priority" statment in the MQC is in effect 100% of the time. This is due to the fact that even if the output queue is not full priority packets can experience delay while waiting for large packets to be admitted to the transmit ring. To prevent this the LLQ send all packets that "match" to the front of the queue, preempting any non-priority packets on their path to the transmit ring. Also congestion is a function of the size of the output queue of the interface and is not directly related to the provisioned rate or access rate of an interface.
HTH,
Brian McGahan, CCIE #8593 (R&S/SP)
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com <https://webmail.123together.com/exchweb/bin/redir.asp?URL=http://www.InternetworkExpert.com>
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
24/7 Support: http://forum.internetworkexpert.com <https://webmail.123together.com/exchweb/bin/redir.asp?URL=http://forum.internetworkexpert.com>
Live Chat: http://www.internetworkexpert.com/chat/ <https://webmail.123together.com/exchweb/bin/redir.asp?URL=http://www.internetworkexpert.com/chat/>
________________________________
From: nobody@groupstudy.com on behalf of Jay Hanke
Sent: Fri 11/24/2006 10:15 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
----------------------------------------------------------------------------=
---------=0A=
=0A=
The information contained in this e-mail message may contain privileged, con=
fidential, and/or proprietary information intended to be protected from publ=
ic disclosure. If you are not the intended recipient, any further disclosure=
, use, dissemination, distribution, or copying of this message or any attach=
ment is strictly prohibited. Unauthorized interception or disclosure of this=
e-mail may violate certain laws and/or regulations, resulting in criminal a=
nd/or civil prosecution. If you think that you have received this e-mail mes=
sage in error, please delete it and notify the sender immediately.
This archive was generated by hypermail 2.1.4 : Fri Dec 01 2006 - 08:05:48 ART