Processing of Packets Received With 802.1p Priority 6

By default, 802.1p examination is turned on.

Priority 7 is mapped to QoS profile QP8, and priorities 6 through 0 are mapped to QoS profile QP1. You can create other QoS profiles and can change this mapping as needed. Since you cannot create QP7 in stacking mode, 802.1p examination always maps packets with priority 6 to other QoS levels. However, you can use an ACL rule entry to set the 802.1p egress value to 6 without affecting the QoS profile assignment as shown in this example:
entry VoIPinSummitStack { if { IP-TOS 46; } then { replace-dot1p-value 6; } }