From: Keane, James (James.Keane@agriculture.gov.ie)
Date: Thu Jun 23 2005 - 11:42:07 GMT-3
Thats for that informative explanation, I think my terminology is flawed, I
should use the term 'Congestion' rather than 'a queue'
So if you have congestion on an interface bandwidth will kick in, but you do
not need congestion for police (within MQC) to kick in and start dropping
packets
The reason for seeking clarity is due to the fact that I have implemented MQC
and police and it seems to be doing jack diddley squat (nothing), but I am
running old code.
-----Original Message-----
From: Bob Sinclair [mailto:bsinclair@netmasterclass.net]
Sent: 23 June 2005 15:29
To: Keane, James; ccielab@groupstudy.com
Subject: Re: QoS - MQC
James,
Policing does not rely on queuing techniques. For example, subinterfaces do
not have queues, but you can apply a policing policy to them directly.
Policing does not require congestion in order to operate.
Regarding the bandwidth statement: there is a difference between "not having
a queue" and "not queueing". Subinterfaces do not have queues, and you
cannot apply a queueing technique to them directly. If there is a queue, and
you have applied a bandwidth statement to reserve bandwidth, but there is no
congestion, then, as you say, the packet bypasses the queue and goes directly
to the interface TX ring.
Shaping techniques create software queues that can then be managed with via
custom/priority/wfq/mqc techniques. Remember, however, that shaping techniques
create a kind of artificial congestion. You can shape to 64K, and fill a
queue, even though the physical interface is a T3 with 5% utilization.
HTH,
Bob Sinclair
CCIE #10427, CCSI 30427, CISSP
www.netmasterclass.net
----- Original Message -----
From: Keane, James <mailto:James.Keane@agriculture.gov.ie>
To: ccielab@groupstudy.com
Sent: Thursday, June 23, 2005 7:27 AM
Subject: QoS - MQC
I have a question regarding MQC and queues
Am I correct in thinking that if you dont have a queue and you implement a
'bandwidth' statement, it wont get used as the packets will be put directly
onto the transmit ring of the interface.
now what about police ?
If I dont have any queues and I want to limit a conversation out a
fastethernet interface to 64k using a police under the MQC
will this work ?
Does MQC only work on the queue on the interface ?? even for police ??
Is the old fashioned rate-limit better in this instance ?
Any thoughts ??
James
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