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Why using trust at interface ?

eigrpy
Level 4
Level 4

‎10-19-2015 11:54 AM - edited ‎03-17-2019 04:37 AM

Hi It looks like that all interface for voip traffic need to be trusted first. Why using the trust ? I think trust configuration can delete all previous mark and start new mark at the interface ? Am I right ? Any one can confirm it or correct it for me ? Thank you 

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Chris Deren
Hall of Fame
Hall of Fame

‎10-19-2015 12:44 PM

What trust are you talking about? Please elaborate, is this QoS trust, toll-fraud prevention trust, something else?

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eigrpy
Level 4
Level 4
In response to Chris Deren

‎10-19-2015 01:25 PM

Sorry.for example, we use the following command for trust configuration for Qos

3560Switch(config-if)#mls qos trust dscp

 

 

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Chris Deren
Hall of Fame
Hall of Fame
In response to eigrpy

‎10-19-2015 02:23 PM

Well, that is not what you would apply to host switch-port, only router, switch uplink as this creates unconditional trust from the port.  QoS on switches depends on switch model and QoS end to end strategy, which you can learn more about in Cisco medianet SRND:

http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND_40/QoSCampus_40.html

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