How Qos Work for untagged traffic in EXOS based switch.

In EXOS, qos based on dot1p value have priority than DSCP value. However, in case of untagged traffic, it does not have tag, so does not have dot1p value.

The QOS logic for those traffic is different per EXOS version.

[Diagram]

Before EXOS version 16.1, it use DSCP value for egress QP.

Slot-1 Stack.3 # show diffserv examination

CodePoint-> QOSProfile mapping:

    00->QP1 01->QP1 02->QP1 03->QP1 04->QP1 05->QP1 06->QP1 07->QP1

    08*>QP1 09*>QP1 10*>QP1 11*>QP1 12*>QP1 13*>QP1 14*>QP1 15*>QP1

    16*>QP1 17*>QP1 18*>QP1 19*>QP1 20*>QP1 21*>QP1 22*>QP1 23*>QP1

    24*>QP1 25*>QP1 26*>QP1 27*>QP1 28*>QP1 29*>QP1 30*>QP1 31*>QP1

    32*>QP1 33*>QP1 34*>QP1 35*>QP1 36*>QP1 37*>QP1 38*>QP1 39*>QP1

    40*>QP1 41*>QP1 42*>QP1 43*>QP1 44*>QP1 45*>QP1 46*>QP1 47*>QP1

    48*>QP1 49*>QP1 50*>QP1 51*>QP1 52*>QP1 53*>QP1 54*>QP1 55*>QP1

    56*>QP5 57->QP8 58->QP8 59->QP8 60->QP8 61->QP8 62->QP8 63->QP8

Slot-1 Stack.5 # show ports 1:1 qosmonitor no-refresh

Port Qos Monitor

Port   QP1      QP2   QP3     QP4   QP5    QP6   QP7   QP8

   Pkt      Pkt   Pkt     Pkt   Pkt    Pkt   Pkt   Pkt

  Xmts     Xmts Xmts    Xmts Xmts   Xmts Xmts Xmts

===========================================================================

1:1 0        0     0       0  88325086   0      0    50

After EXOS version 16.1, it use default dot1p value configured on the port by below commands.

configure ports <ports> dot1p <dot1p_priority>

As a result, traffic with high DSCP ( for example, DSCP 56 also use lowest QP -QP1 )

* Slot-1 Stack.7 # show diffserv examination

CodePoint-> QOSProfile mapping:

       00->QP1 01->QP1 02->QP1 03->QP1 04->QP1 05->QP1 06->QP1 07->QP1

       08*>QP1 09*>QP1 10*>QP1 11*>QP1 12*>QP1 13*>QP1 14*>QP1 15*>QP1

       16*>QP1 17*>QP1 18*>QP1 19*>QP1 20*>QP1 21*>QP1 22*>QP1 23*>QP1

       24*>QP1 25*>QP1 26*>QP1 27*>QP1 28*>QP1 29*>QP1 30*>QP1 31*>QP1

       32*>QP1 33*>QP1 34*>QP1 35*>QP1 36*>QP1 37*>QP1 38*>QP1 39*>QP1

       40*>QP1 41*>QP1 42*>QP1 43*>QP1 44*>QP1 45*>QP1 46*>QP1 47*>QP1

       48*>QP1 49*>QP1 50*>QP1 51*>QP1 52*>QP1 53*>QP1 54*>QP1 55*>QP1

       56->QP8 57->QP8 58->QP8 59->QP8 60->QP8 61->QP8 62->QP8 63->QP8

* Slot-1 Stack.11 # show ports 1:1 qosmonitor no-refresh

Port Qos Monitor

Port           QP1        QP2        QP3        QP4     QP5        QP6        QP7     QP8

              Pkt        Pkt        Pkt        Pkt     Pkt        Pkt     Pkt     Pkt

             Xmts       Xmts       Xmts       Xmts    Xmts       Xmts       Xmts    Xmts

==========================================================================================

1:1     2734132554       0          0        0        0       0          0    76048