From: Dufour, Andre (Andre.Dufour@PAETEC.com)
Date: Fri Mar 27 2009 - 13:34:10 ART
Hello,
The TX-ring is the hardware queue. For most devices, it is essentially the last "queue" before a packet is sent. QoS is done before a packet reaches this hardware queue.
Here are some general notes that I have:
Key Points on HW Queues in relation to their effect on software queuing:
1. The HW queue always performs FIFO scheduling and cannot be changed.
2. The HW Queue uses a single queue per interface.
3. IOS shortens the interface HW queue automatically when a software queuing method is configured.
4. The HW queue length can be configured to a different value.
5. The software queue (interface output queue) is only used if the HW queue (TX Ring) is full.
Again, some Cisco devices will have queuing is specific solely to them. The above notes is for general IOS.
Regards,
Andre
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of ??? ?????
Sent: Friday, March 27, 2009 12:11 PM
To: asequeira@internetworkexpert.com; ccielab@groupstudy.com
Subject: Question regard output of data from router TX-Ring and qos
Thanks for the advice in multicast, I Will try that.
I have Problem to send my questions to ccielab@groupstudy.com I Don't know why.
its says that I need to confirm my e-mails which I have done for about 4 times by repling to their e-mail.
Anyway
I am probably missing something regard True Output of Data from Router.
and regarding Tx-Ring and output queue and true line bandwidth.
Lets say This is the topology:
Router 100 Mbits -> Adsl Modem 100 Mbits -> Service Provider equipment 4 Mbits Line.
If I have a router with 100 Mbits Output and Modem with 100 mbits, and the SP line is 4 mbits From What I Understand The Router doesn't know of the existance of the line with 4 mbits and sending in 100mbits per second to the adsl modem .
And I am doing only Qos LLQ to Voip trafiic. which put the voice traffic first out from the interace.
Tx-ring is 15.
I Dont understand how much packets will be out from the router in per ms ?
If the router will really send 100 Mbits per second.
And if there is a possible that the Service provider will receive more then
4 Mbits per second and will drop packets in his side.
Which means that my only LLQ is not a good solution - and I need to use a Parent Qos with Shaping 4 Mbits and child with LLQ.
What is the job of the Tx-ring in all this ?
Please assist to understand this subject better.
Thanks, Eshed.
Blogs and organic groups at http://www.ccie.net
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