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2.3.8- Efhtb |
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| Next example is implemented by DS on Linux
Distribution with the name Efhtb. This is a very simple implementation of the Expedited Forwarding (EF)
class using a Linux specific queuing discipline called htb. Implementing this example in
Linux is very easy. Let's see how it works on Cisco. |
| The idea is having two classes: EF and BE.
EF packets will be assigned to a priority queue with a
bandwidth availability of 1500 Kbps; rest of packets are
considered BE traffic and will be assigned to a RED queing
discipline using min-threshold of 15 Kb,
max-threshold of 45 Kb and a drop probability of
0.4 (1/2.5) with a
bandwidth availability of 5000 Kbps; because Cisco requires integer
values we will use just 3 as the
mark-probability-denominator for the RED queue. |
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| Using Cisco CLI the implementation is very
easy too; just type in your router: |
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Because BE class will include any traffic not marked as DSCP EF
(46), then we have to use the random-detect precedence command to
implement RED for all packets using the same configuration. |
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Well, fellows!! We are ready with all the examples of the original
Linux Diffserv distribution; our next step in this study will be trying
to configure some typical Differentiated Service implementations
using Cisco. Then, let's go on. |
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Sorry, this work is yet in progress. I
will try to add a little everyday as soon as I can steal some time from my
schedule... |
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