| Author |
Message |
Kevin
Guest
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 Posted:
Wed Dec 15, 2004 10:57 pm Post subject:
Asymetric Ethernet - ADSL - Queueing |
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Hi,
I'm using an ADSL modem connected to the Ethernet interface of the cisco.
Due to ADSL technology the bandwith is asymetrical, (ie. 8MB/s input - 1MB/s
outpout)
I would like to be able to use queuing strategy to give priority to packets
over others regarding criteria on the output of that interface.
Is there a way to tell the cisco that the output bandwith limit is 1MB/s on
the ethernet interface ? (the interface bandwith command only support
symetrical syntax)
How can I set up a queueing strategy that would take place at 1MB/s output
rate ?
As far as I tested queuing strategy using
class-map/policy-map/service-policy will not trigger until the interface
maximum output rate is reached (which is ethernet 10MB/s) ...
Thanks ! |
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Walter Roberson
Guest
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| Posted:
Wed Dec 15, 2004 11:21 pm Post subject:
Re: Asymetric Ethernet - ADSL - Queueing |
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In article <41c07ae0$0$6434$79c14f64@nan-newsreader-07.noos.net>,
Kevin <Kevin@hotmail.com> wrote:
:I'm using an ADSL modem connected to the Ethernet interface of the cisco.
:Due to ADSL technology the bandwith is asymetrical, (ie. 8MB/s input - 1MB/s
:outpout)
This gives us marginally more information about what your Cisco device
is than your previous posting on much the same topic did -- we can
eliminate from the list the routers that can only have one ethernet
interface, the routers that have built-in ADSL, and the routers that
cannot handle 8 megabits/s. That only leaves a few thousand
hardware and software combinations for us to guess against. I figure
we could probably get it down to the right model and minor IOS release
number if we played "20 Questions" with you, but I'm not sure that
we could get it down to the proper recompile in only 20; you might
have to allow us 23 questions or so.
:I would like to be able to use queuing strategy to give priority to packets
:over others regarding criteria on the output of that interface.
:Is there a way to tell the cisco that the output bandwith limit is 1MB/s on
:the ethernet interface ? (the interface bandwith command only support
:symetrical syntax)
The interface bandwidth statement controls nothing other than
the calculation of some routing metrics for -some- of the routing
protocols; that and the display of % bandwidth usage in programs
such as MRTG that suppose the assigned bandwidth value to be accurate.
The interface 'bandwidth' should be thought of as much closer to
a remark than to anything active.
:How can I set up a queueing strategy that would take place at 1MB/s output
:rate ?
:As far as I tested queuing strategy using
:class-map/policy-map/service-policy will not trigger until the interface
:maximum output rate is reached (which is ethernet 10MB/s) ...
Don't use percentages, use absolute bandwidth figures, and ensure
that you have a catch-all route-map entry that covers the rest of
the packets and assigns a limit to that class.
--
"The human genome is powerless in the face of chocolate."
-- Dr. Adam Drewnowski |
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Kevin
Guest
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| Posted:
Thu Dec 16, 2004 3:46 am Post subject:
Re: Asymetric Ethernet - ADSL - Queueing |
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Hi,
Thanks for your reply.
| Quote: | This gives us marginally more information about what your Cisco device
is than your previous posting on much the same topic did
|
The router is a 1721 , IOS 12.3 ...
The only way I found to set up a queueing strategy at 1MB/s on the output
ethernet 0 interface
is to use traffic shaping at 1MB/s which enables WFQ and then tweak the TOS
of the ip packets using
priority-list / interface priority-group to give higher priority to certain
ip packets.
I would like to know if there is a better way to do it...
| Quote: | Don't use percentages, use absolute bandwidth figures, and ensure
that you have a catch-all route-map entry that covers the rest of
the packets and assigns a limit to that class.
|
Can you give me a quick config example on how to have all the output
bandwith (1MB/s and not 10MB/s)
on ethernet 0 used for every ip packets, but to set ip gre packets have
higher priority over the rest without
using traffic shaping to force WFQ at 1MB/s ?
Thanks. |
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