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Watson-Ethernet-Manual.doc

Version 3.3-01

Watson Ethernet

Operating Manual

Revision: 2010-01-20

3-19

Performance parameters

The operation of the RSTP is controlled by a set of configurable performance pa-

rameters:

 Hello Time: the interval between periodic transmissions of configuration mes-

sages by Designated ports. Configurable with the STP HELLO Monitor com-

mand.

 Maximum Age: maximum age of a BPDU before it is discarded. The age of a

BPDU is incremented by one on each traversal through a bridge.

A bridge port that was disabled (e.g. through a reset or a link integrity failure)

will wait Maximum Age seconds before transiting into Learning state. The

Maximum Age parameter is controlled with the STP MAXAGE Monitor com-

mand.

 Forwarding Delay timer: the delay used by the bridge in STP mode to transi-

tion Root and Designated Ports to Forwarding (this transition will take maxi-

mum Hello Time seconds in RSTP mode). Set with the STP FORWARD Moni-

tor command.

The following relationships are enforced by the Watson Ethernet plug-in:

2 (Forward-Delay-Timer – 1.0 seconds) Maximum-Age-Timer

Maximum-Age-Timer 2 (Hello-Time + 1.0 seconds)

 Transmit Hold Count: the maximum number of bridging protocol data units

(BPDUs) transmitted per second. Controlled with the STP TXHOLD Monitor

command.

3.3 Ethernet (tabletop modem)

3.3.1 Ethernet over DSL

The Watson Ethernet tabletop modem uses the same HDLC procedure to trans-

port Ethernet frames over DSL as the Watson Ethernet plug-in modem. Cf. 3.2.1

3.3.2 VLAN features

The Watson Ethernet tabletop modem is transparent for VLAN tags according to

IEEE 802.1p/q.

A default VLAN tag can be added to packets without VLAN tags.

In double tagging mode a second VLAN tag is supported.

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