RuggedCom RS400 Spanning Tree Enabled, Priority, STP Cost, Rstp Cost, Edge Port, Point to Point

Spanning Tree

Enabled

Synopsis: { Disabled, Enabled }

Default: Enabled

Enabling STP activates the STP or RSTP protocol for this port per the configuration in the STP Configuration menu. STP may be disabled for the port ONLY if the port does not attach to an STP enabled bridge in any way. Failure to meet this requirement WILL result in an undetectable traffic loop in the network. A better alternative to disabling the port is to leave STP enabled but to configure the port as an edge port. A good candidate for disabling STP would be a port that services only a single host computer.

Priority

Synopsis: { 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 194, 208, 224, 240 }

Default: 128

Selects the STP port priority. Ports of the same cost that attach to a common LAN will select the port to be used based upon the port priority.

STP Cost

Synopsis: 0 to 65535 or { Auto }

Default: Auto

Selects the cost to use in cost calculations, when the Cost Style parameter is set to STP in the Bridge RSTP Parameters configuration. Setting the cost manually provides the ability to preferentially select specific ports to carry traffic over others. Leave this field set to "auto" to use the standard STP port costs as negotiated (4 for 1Gbps, 19 for 100 Mbps links and 100 for 10 Mbps links).

For MSTP, this parameter applies to both external and internal path cost.

RSTP Cost

Synopsis: 0 to 2147483647 or { Auto }

Default: Auto

Selects the cost to use in cost calculations, when the Cost Style parameter is set to RSTP in the Bridge RSTP Parameters configuration. Setting the cost manually provides the ability to preferentially select specific ports to carry traffic over others. Leave this field set to "auto" to use the standard RSTP port costs as negotiated (20,000 for 1Gbps, 200,000 for 100 Mbps links and 2,000,000 for 10 Mbps links).

For MSTP, this parameter applies to both external and internal path cost.

Edge Port

Synopsis: { False, True, Auto }

Default: Auto

Edge ports are ports that do not participate in the Spanning Tree, but still send configuration messages. Edge ports transition directly to frame forwarding without any listening and learning delays. The MAC tables of Edge ports do not need to be flushed when topology changes occur in the STP network. Unlike an STP disabled port, accidentally connecting an edge port to another port in the spanning tree will result in a detectable loop. The "Edgeness" of the port will be switched off and the standard RSTP rules will apply (until the next link outage).

Point to Point

Synopsis: { False, True, Auto }

Default: Auto

RSTP uses a peer to peer protocol that provides for rapid transitioning on point-to-point links.

RS400 151 ROS™ v3.5