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VSC7440 数据表(PDF) 39 Page - Microsemi Corporation

部件名 VSC7440
功能描述  L2/L3 Enterprise Gigabit Ethernet Switch with 10 Gbps Links
PDF  444 Pages
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制造商  MICROSEMI [Microsemi Corporation]
网页  http://www.microsemi.com
标志 MICROSEMI - Microsemi Corporation

VSC7440 数据表(HTML) 39 Page - Microsemi Corporation

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Functional Descriptions
VMDS-10492 VSC7440 Datasheet Revision 4.2
22
The following table describes each field in the VStaX header.
Table 3 •
VStaX Header Fields
Field Category
Field Name
Bit
Width
Description
Reserved
RSV
79
1 bit
Reserved field. Must be set to 1 when injecting
frames and must be checked on extraction.
MISC when
ANA_AC:PS_COMMO
N.VSTAX2_MISC_ISD
X_ENA=1
COSID
78:76
3 bits
Class of service.
ISDX
75:64
12 bits
Ingress service index.
MISC when
ANA_AC:PS_COMMO
N.VSTAX2_MISC_ISD
X_ENA=0
RSV
78:68
11 bits
Reserved field. Must be set to 0 when injecting
frames from CPU and ignored on extraction.
AC
67:64
4 bits
GLAG aggregation code
Reserved
RSV
63:62
2 bits
Reserved field. Must be set to 0.
QOS
CL_DP
60:61
2 bits
Classified drop precedence level.
SP
59
1 bit
Super priority.
Identifies frames to be forwarded between CPUs
of neighboring units, using egress and ingress
super priority queues in the assembler and
disassembler.
CL_QOS (IPRIO)
58:56
3 bits
Classified quality of service value (internal
priority).
INGR_DROP_MOD
E
55
1 bit
Congestion management information.
0: Ingress front port is in flow control mode.
1: Ingress front port is in drop mode.
Reserved
RSV
54
1 bit
Reserved field. Must be set to 0.
General
RSV
53
1 bit
Reserved field. Must be set to 0.
TTL
52:48
5 bits
Time to live.
LRN_MODE
47
1 bit
0: Normal learning. SMAC and VID of the frame is
subject to learning.
1: Skip learning. Do not learn SMAC and VID of
the frame.
FWD_MODE
46:44
3 bits
Forward mode.
Encoding:
0x0: FWD_LLOOKUP: Forward using local lookup
in every unit.
0x1: FWD_LOGICAL: Forward to logical front port
at specific UPS.
0x2: FWD_PHYSICAL: Forward to physical front
port at specific UPS.
0x3: FWD_MULTICAST: Forward to ports part of
multicast group.
0x4: FWD_GMIRROR: Forward to global mirror
port.
0x5: FWD_GCPU_UPS: Forward to GCPU of
specific UPS.
0x6: FWD_GCPU_ALL: Forward to all GCPUs.
0x7: Reserved.
Reserved
RSV
43
1 bit
Reserved field. Must be set to 0.



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