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New Member

End-to-End QoS Campus Design Limitation?

Hi all,

Design question here. Please look at the attached picture.

Can you support end-to-end QoS from IP Phone 1 to IP Phone 2 if the backbone to distribution links are not trunks? If so, how does this work, as a ported link (non-trunk) cannot carry a priority field as there is no ISL or dot1q header on the frame passing from distribution to core?

Kindest regards,

Ken

1 ACCEPTED SOLUTION

Accepted Solutions

Re: End-to-End QoS Campus Design Limitation?

The description of the required commands is in the switch command reference:

http://www.cisco.com/en/US/products/hw/switches/ps646/products_configuration_guide_chapter09186a0080476087.html

There are some pictures showing the QoS domain. Might not be exactly what you are looking for but this document describes what you should configure.

The command sequence may be slightly different depending on the type of core-switch that you have.

Regards,

Leo

4 REPLIES

Re: End-to-End QoS Campus Design Limitation?

End-End Qos still remains possible.

You can also realize QoS by looking at the DSCP field in the IP header. On the core switches and the links to the distribution layer, this would require configuring the interface command:

mls qos trust dscp

instead of: mls qos trust cos

The switches are able to link DSCP value X to CoS value Y and vice-versa. This funtionality elimiates the need to have 802.1p CoS info in the layer2 header.

Regards,

Leo

New Member

Re: End-to-End QoS Campus Design Limitation?

thats brill thx.

just wondering if there is a good cisco or other vendor tech note to describe QoS on trunk and non-trunks etc, with some nice pretty pictures?

many th indeed,

Ken

Re: End-to-End QoS Campus Design Limitation?

The description of the required commands is in the switch command reference:

http://www.cisco.com/en/US/products/hw/switches/ps646/products_configuration_guide_chapter09186a0080476087.html

There are some pictures showing the QoS domain. Might not be exactly what you are looking for but this document describes what you should configure.

The command sequence may be slightly different depending on the type of core-switch that you have.

Regards,

Leo

New Member

Re: End-to-End QoS Campus Design Limitation?

cheers Leo?

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