PM3350-SW datasheet(141/224 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

139

descriptor counter structure for that MAC channel. The per-port statistics maintained in

the port descriptor counter structures may be retrieved at any time by direct accesses to

these structures via the PCI bus interface; however, the statistics in the port descriptors

themselves are cached by the Switch Processor, and hence can only be retrieved via

the message interface.

The ELAN 8x10 device also maintains counters on a per-MAC-address (or per-host)

basis, with a separate set of counters being maintained for each MAC address that has

been learned by the system. These counters are held in the hash bucket associated

with the learned MAC address. (Note that forwarding tags do not contain any counters;

hence only one set of counters will be maintained for each MAC address in a multi-

device system, rendering retrieval of the per-host statistics relatively straightforward.)

These counters are described in the following table:

Per-host Counters

Name

Description

RXHUcstFrames

Valid unicast frames received from this host

RXHBcstFrames

Valid broadcast frames received from this host

RXHMcstFrames

Valid multicast frames received from this host

RXHFloodFrames

Valid frames received from this host and then flooded

RXHErrorFrames

Errored frames received from this host

RXHOctets

Octets received from this host, valid or invalid

TXHFrames

Valid unicast frames transmitted to this host

TXHOctets

Valid unicast octets transmitted to this host

LastRX (AgeControl)

Time at which frame was last received from this host

CreateTime

Creation time of hash bucket

The per-host statistics may be retrieved at any time via direct accesses to the hash

buckets in the address table through the PCI bus interface, or using the message

interface.

NOTES pertaining to statistics collection:

• the maximum number of octets that can be counted for any received frame (whether

erred or received without error) is decimal 65,535 (which is 0xffff). This limits the

number of bytes that will be counted if receiving a long or jabber frame and

maintained as variable “RXErrorOctets” in the above table.

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