Specifications

9032294 E2 Application Views

5-23

LinkSwitch 1000 Application

LinkSwitch 1000 Database view

Forwarding Action

Displays what action to takes when the device receives a packet with an

unknown destination address. Possible values are Not Applicable, Forward to

Downlink, and Forward to All. Forward to Downlink forwards the packet to

the downlink (if any) associated with the source port. Forward to All forwards

the packet to all ports.

Forwarding Mode

Displays whether cut-thru is enabled. Enabling cut-thru can help to minimize

the delay experienced by packets before they are forwarded to their

destination. Setting cut-thru to Fast Forward causes frame forwarding to

begin as soon as 32 bytes of the frame have been received. Setting it to

Fragment Free causes frame forwarding to begin when 64 bytes have been

received. This is slower but eliminates the risk of forwarding an illegally short

frame to the destination port, however a valid length frame might still be

forwarded even though it had a CRC error. Setting this object to Store &

Forward disables cut-thru completely, and frames will not be forwarded until

they have been received in their entirety.

Cut-thru cannot operate if the destination port is currently involved in “cut-

thru” from another port. In this case the device will process the frame in Store

& Forward mode.

Pace Mode

Displays the type of backoff algorithm used on the device. A device can use the

standard ethernet algorithm or, for PACE applications, the low latency mode

should be used. This value deﬁnes the setting that a port will use if the port

Pace Mode is set to default.

Possible values are Not Applicable, Use Default, Normal Ethernet, and Low

Latency. This value can be changed by double-clicking the relevant row of the

Conﬁguration Table in the LinkSwitch 1000 Conﬁguration View.

HP Type

Displays how the unit will decide if a packet is high or normal priority. The

priority is determined from the source address of an incoming packet. If HP

Type is set to Local Bit any packets with the local bit set will be considered to

be high priority. If HP Type is set to Use Mask the OUI of the source address

will be compared with Mask Value and, if they are the same, the packet is

considered high priority.

Mask Value

Displays the mask which will be used to determine if a packet is high or

normal priority. If the OUI of the source address matches this mask the

packet is considered to be high priority.

LinkSwitch 1000 Database view

This view contains the Database Table and the following ﬁelds: