QoS on each device in the path network?

Hello

Apologies, as I'm new to QoS, but it's something I can't find a clear answer too,

I understand the notion of quality of service on the routers, it's usually the field I see QoS easally passing in the form of WAN links tend to be 10 MB/20 MB etc., so we need to prioritize the traffic as these links can congested bandwidth.

I understand the use of the class / political cards to identify traffic and bandwidth priority, and then apply the service policy to the output interface on the interface that connects to the WAN link.

We need quality of service on the local network that connects to the Wan? Even switches layer 2? ... is by port, how to identify traffic at the switch level and give priority to it?

Help, please!

Thank you

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I'm not a supporter of QoS from end to end, just because you can, either that's what suggests '' the book. ''  There is a cost for their maintenance and QoS implementations, and if done correctly, QoS can degrade service.

Where you should have QoS is on any interface where forms of congestion it is unfavourable to of the application serve the needs and which may be updated by QoS.  (Sometimes the 'right' solution is more bandwidth, although often more bandwidth is achieved when the quality of service could be a more optimal).

Often, there are undesirable congestion on WAN interfaces, because as you note, they provide less bandwidth LAN interfaces.  (Also WAN bandwidth is also often more expensive to provide than the LAN bandwidth).

Placing the QoS on the interfaces that don't really need, it's a bit like buying insurance.  It adds to your "cost", but offers "protection" for the unexpected.  Once again, as if you must buy insurance, for which coverage and cost, QoS implementations should also take into account coverage and expected benefit vs cost.

So...

We need quality of service on the local network that connects to the Wan?

Maybe, maybe not, but also again, often if you do not need effective QoS, LAN to WAN is a common place.

Even switches layer 2?

Another maybe, maybe not.

... is by port, how to identify traffic at the switch level and give priority to it?

In fact how depends on the device.

Often, you have a policy of penetration which examines the traffic, and based on what it "sees" could allow the self marked traffic to go markedly or brand/note traffic according to the needs.

Device can have the exit policy that determines how the traffic is processed, including priorities, when there is congestion.

The thing to understand about QoS is to respond to the needs of your traffic, made service by managing the queuing traffic and lozenges.

QoS often becomes a point of discussion when dealing with VoIP.  However, not all needs of VoIP QoS in all cases and even cases such as data transfers in bulk, could be improved in QoS.

Unfortunately, QoS corresponds with the old cliché, "can't see the forest for the trees".  Most hardware QoS explains how to treat the 'trees', but does not explain how the forest should be managed.

Tags: Cisco Network

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