PM3350-SW datasheet(93/224 Pages) PMC

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ELAN 8X10

PM3350 ELAN 8 X10

DATA SHEET

PMC-970109

ISSUE 3

8 PORT ETHERNET SWITCH

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND PMC-SIERRA, INC. CUSTOMERS ONLY

Hash Buckets

Hash buckets are created to store frame handling and statistics information for all MAC

addresses that are discovered to be directly reachable via a local MAC channel on the

ELAN 8x10 device. Each hash bucket contains, in addition to the IEEE 802.3 MAC

address with which it is associated, various fields used in forwarding the incoming

frame, controlling the aging process, and maintaining per-host statistics. The format of

a 64-byte hash bucket is given below:

24 23

16 15

8 7

0 Byte Offset

reserved

NextHB

MACAddr[23:16]

MACAddr[31:24]

MACAddr[7:0]

MACAddr[15:8]

MulticastMask

MACAddr[39:32]

MACAddr[47:40]

HBFlags

LPDPtr

TXFrames

TXOctets

RXErrorFrames

RXMcstFrames

RXFloodFrames

RXBcstFrames

RXUcstFrames

RXOctets

AgeControl

CreateTime

Reserved

NextHB:

24-bit pointer to next hash bucket or forwarding tag in linked-list; NULL if

none.

MACAddr:

48-bit IEEE 802.3 MAC address associated with this hash bucket.

MulticastMask:

16-bit mask used to restrict multicasts directed to this MAC address to a

subset of the ports on this ELAN 8x10 and a subset of the devices in the

system. Only valid for multicast MAC addresses, as indicated by the proper

setting of the HBFlags field.

PM3350-SW Datasheet(PDF) 93 Page - PMC-Sierra, Inc

PM3350-SW Datasheet(HTML) 93 Page - PMC-Sierra, Inc

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