QoS question

Answered Question
Jan 30th, 2008
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Hi,


I would like to enable the QoS on the router. Do I config both routers (send and receive)


e.g.

one IPLC between HK and TW. the routers are HKR1, TWR1


do we config QoS on both routers HKR1 and TWR1?


rdgs

Correct Answer by a.cruea1980 about 9 years 5 months ago

If you only configure the outgoing on one side, you'll only have QoS coming out of that site. The reason for configuring outbound on both sites is to have QoS conformity for your entire enterprise to the highest extent possible.


Let's say you only configure QoS on HKR1, and not TWR1. The packets coming out of HKR1 to TWR1 would be properly queued, classified, and QoS'd, and data/voice/video would be smooth coming out of HKR1 when it's headed outbound.


However, anything coming out of TWR1 would be FIFO queued, and your voice/video/data could be choppy for HKR1 to receive.


Without proper configuration on both sides, while QoS isn't totally useless, you won't see the best benefits from it.

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a.cruea1980 Wed, 01/30/2008 - 06:56
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You can really only QoS outgoing packets (minus a few exceptions).


So, you'd configure both routers for QoS on send only.

Wilson Samuel Wed, 01/30/2008 - 06:58
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Hi Anita,


Yes, to achieve effective QoS it has to be uniform across the enterprise. The way you classify and mark a packet needs to be in uniformity across the network or else there is little or no achievement for using QoS


Regards,

Wilson Samuel

anitachoi3 Wed, 01/30/2008 - 07:34
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Hi,


If I config one side, the QoS should not work. is it correct?


rgds

Correct Answer
a.cruea1980 Wed, 01/30/2008 - 07:43
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If you only configure the outgoing on one side, you'll only have QoS coming out of that site. The reason for configuring outbound on both sites is to have QoS conformity for your entire enterprise to the highest extent possible.


Let's say you only configure QoS on HKR1, and not TWR1. The packets coming out of HKR1 to TWR1 would be properly queued, classified, and QoS'd, and data/voice/video would be smooth coming out of HKR1 when it's headed outbound.


However, anything coming out of TWR1 would be FIFO queued, and your voice/video/data could be choppy for HKR1 to receive.


Without proper configuration on both sides, while QoS isn't totally useless, you won't see the best benefits from it.

Joseph W. Doherty Wed, 01/30/2008 - 17:39
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Also keep in mind that traffic flows are not always symmetrical. So, the best QoS configuration might not be symmetrical either. I.e. The outbound QoS configurations on HKR1 and TWR1 could be validly different.


If your link is not physically point-to-point of the same bandwidth, QoS technique sometimes can also be used to assist.

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