The IP Precedence bits, like 802.1p CoS bits, allow for only the following 8 values of marking (0–7):
– IPP values 6 and 7 are generally reserved for network control traffic such as routing.
– IPP value 5 is recommended for voice.
– IPP value 4 is shared by videoconferencing and streaming video.
– IPP value 3 is for voice control.
– IPP values 1 and 2 can be used for data applications.
– IPP value 0 is the default marking value.
That’s not right, Routing should be prioritized before anything else, otherwise routing protocols might fail. From highest to lowest, this is a more preferred order:
PHB: Application:
CS6 Routing
EF Voice
AF41 Video Interactive
CS4 Video Streaming
CS3 Call-Signaling
CS2 Network MGMT
William is right.
The IP Precedence bits, like 802.1p CoS bits, allow for only the following 8 values of marking (0–7):
– IPP values 6 and 7 are generally reserved for network control traffic such as routing.
– IPP value 5 is recommended for voice.
– IPP value 4 is shared by videoconferencing and streaming video.
– IPP value 3 is for voice control.
– IPP values 1 and 2 can be used for data applications.
– IPP value 0 is the default marking value.
That’s not right, Routing should be prioritized before anything else, otherwise routing protocols might fail. From highest to lowest, this is a more preferred order:
PHB: Application:
CS6 Routing
EF Voice
AF41 Video Interactive
CS4 Video Streaming
CS3 Call-Signaling
CS2 Network MGMT
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/QoS-SRND-Book/QoSIntro.html