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CFIP PhoeniX C Series TDM/IP Split Mount System Technical Description and Configuration Guide
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Rev. 1.0
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© SAF Tehnika JSC 2013
Priority abbreviations
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FPRI
initial frame priority 0 up to 7 (bits [2:0])
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QPRI
queue priority 0 up to 3 (bits [1:0])
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IQPRI
initial queue priority 0 up to 3 (bits [1:0])
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OQPRI
queue override priority 0 up to 3 (bits [2:1] from QOS PRI value)
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PRI_T
PRI bits from 802.ac VLAN tag
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PRI_IP
hex value of IP v4/6 frame's TOS/DiffServ/TC bits [7:2]
Port default priority
–
FPRI_D
= port default frame priority, defined with Port Priority value
–
QPRI_D = port default queue priority, defined with next mapping table
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QPRI_D = 0 when FPRI_D=0/1
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QPRI_D = 1 when FPRI_D=2/3
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QPRI_D = 2 when FPRI_D=4/5
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QPRI_D = 3 when FPRI_D=6/7
IEEE Tag priority
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FPRI_T = IEEE Tag frame priority, defined with value of PRI bits from VLAN tag
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QPRI_T = IEEE Tag queue priority, defined with next mapping table
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QPRI_T = 0 when FPRI_T=0/1
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QPRI_T = 1 when FPRI_T=2/3
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QPRI_T = 2 when FPRI_T=4/5
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QPRI_T = 3 when FPRI_T=6/7
IP v4/6 priority
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FPRI_IP = IPv4/6 frame priority, defined with following figure
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FPRI_IP = QPRI_IP*2 + FPRI_D[0]
or defined in another way
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FPRI_IP[2:1] =QPRI_IP[1:0]
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FPRI_IP[0] = FPRI_D[0]
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QPRI_IP = IPv4/6 queue priority, defined with next mapping table (hex values)
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QPRI_IP = 0 when PRI_IP=00/04/08/0c/10/14/18/1c/20/24/28/2c/30/34/38/3c
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QPRI_IP = 1 when PRI_IP=40/44/48/4c/50/54/58/5c/60/64/68/6c/70/74/78/7c
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QPRI_IP = 2 when PRI_IP=80/84/88/8c/90/94/98/9c/a0/a4/a8/ac/b0/b4/b8/bc
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QPRI_IP = 3 when PRI_IP=c0/c4/c8/cc/d0/d4/d8/dc/e0/e4/e8/ec/f0/f4/f8/fc
There is a detailed explanation of all possible QOS modes in the following description:
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QOS Modes
– This drop-down menu defines egress queue policy function. The function is
independent of any other QOS configurations. Each egress frame is assigned with such queue
whose number is identical to frame's QPRI identifier.
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weighted
– In the weighted scheme an 8, 4, 2, 1 round robin weighting is applied to the four
priorities (8 frames from Q3, 4 frames from Q2, 2 frames from Q1 and 1 frame from Q0).
This approach prevents the lower priority frames from being starved out with only a slight
delay to the higher priority frames.
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strict 3xxx –
Strict priority for queue 3 and weighted round robin for queues 2,1 and 0.
Queues 2,1,0 are served only when Q3 is empty.
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strict 32xx –
Strict priority for queues 3,2 and weighted round robin for queues 1 and 0.
Queues 1,0 are served only when Q3 and Q2 are empty.
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strict 3210 –
Strict priority for all queues. Lower priority queues are served only when higher