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Trust Boundary

Posted on 2011-09-15
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Last Modified: 2012-05-12
In the following setup for a fully configured switch with voice VLAN,

Dist-SW---Access_SW-----IP_PHONE-----PC

Where would the trust boundary get set up, is it IP Phone access port, access switch port or
distribution switch port?? Please explain along with the choice.
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Question by:totaram
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Expert Comment

by:Don Johnston
ID: 36546548
If you're configuring the phone, then you would trust the port on the switch that connects to the phone.

If you're not configuring the phone, then that port would be untrusted and you would classify and mark the traffic at the switch.
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Author Comment

by:totaram
ID: 36547012
You mean Access switch?

Can you please explain what mean by configuring phone? Phone does not need any copnfig...
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Don Johnston earned 125 total points
ID: 36547054
Yes, the access switch.

If you have configured the phone for QOS, then the switch would be configured to trust the QOS marking and act on that marking.

If you don't configure the phone, then the access switch port would be configured as "untrusted" and you would have to configure the switch to classify and mark the traffic.
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Author Comment

by:totaram
ID: 36547089
Thanks DonJ;
Yes, phone is configured for QoS... but PC is connected to the ingress of IP phone, will the access switch port the trust QoS marking from PC too?
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Expert Comment

by:Don Johnston
ID: 36547096
>will the access switch port the trust QoS marking from PC too?

Yes. the switch will trust all traffic entering the port.
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Author Comment

by:totaram
ID: 36547110
I guess the switch config needs to override the CoS priority of PC packets coming at IP Phone ingress... one can have the packets from PC that should really not get priority over the Voice packets.
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Expert Comment

by:Don Johnston
ID: 36548471
>I guess the switch config needs to override the CoS priority of PC packets coming at IP Phone

On phones that allow the marking of data traffic, you would not trust the data port of the phone.
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