A.1. you could use both versions in case the settings are correct for 802.1Q CoS bits as well as for DSCP.
A.2. The command "qos trust extend cos 0" can only be used in conjunction with settings for Cisco phones. Basically the Cisco phone will learn through CDP which CoS value to apply to traffic from the PC. I doubt this will work with Nortel phones. You may need to configure the Nortel phones directly and skip this part in the switch config.
Thanks for the prompt reply. Reg. A2 - 'qos trust extend cos 0'. I want to ensure a connected PC is not able to set cos > 0. How to do that if this command doesnot work ??? If the port is 'trust dscp' then a connected PC may exploit it by assigning a high dscp value.
Nortel phone doc doesnot talk about COS/DSCP. I got another idea. If on access/data vlan int on 4500, I define 'no trust dscp', then the dscp vlaue passed by PC will be reset to zero (qos vlan-based). Is that correct ?
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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