Alloy Computer Products POEGEM12T2SFP Configured Path Cost, 802.1w Rstp recommended values

POEGEM12T2SFP User Manual

Configured Path Cost:

If the path cost is equal to zero, the path cost will be auto-negotiated and displayed in the path cost status field. Otherwise the value that the administrator has set manually will be displayed. Valid range is 0 – 200,000,000

802.1w RSTP recommended values:

10Mbps: 2,000,000

100Mbps: 200,000

1Gbps: 20,000

Default: 0

Priority:

Indicates the port priority, the port priority and port number are mixed to form the port ID. Port ID’s are often compared in order to determine which port of a bridge would become the root port. Valid range is 0 – 240

Default: 128

Admin Edge Port:

If Enabled, this port will be an edge port. An Edge Port is a port connected to a device that knows nothing about STP or RSTP. Usually, the connected device is an end station. Edge Ports will immediately transit to forwarding state and skip the listening and learning state because edge ports cannot create bridging loops in the network. When the link on the edge port toggles, the STP topology stays unchanged. Unlike the designated port or root port, an edge port will transit to a normal spanning-tree port immediately if it receives a BPDU.

Default: No

Admin Point to Point:

We say a port is a point-to-point link, if it is in full-duplex mode but is a shared link if it is in half-duplex mode. RSTP’s fast convergence can only occur on point- to-point links and on edge ports.

There are three parameters, Auto, True and False, used to configure the type of point-to-point link. If this parameter is configured as Auto, it means that RSTP will use the duplex mode resulting from the auto-negotiation. In today’s switched networks, most links are running in full-duplex mode. If the result is half-duplex, then the port will not fast transit to Forwarding state. If it is set as True, the port is treated as a point-to-point link by RSTP and will be unconditionally transited to Forwarding state. If it is set as False, fast transition to Forwarding state will not occur on this port.

Default: Auto

M Check:

Migration Check, forces the port to send out an RSTP BPDU instead of a legacy STP BPDU at the next transmission. The only benefit of this operation is to make the port quickly act as an RSTP port. Click the <M Check> button to send a RSTP BPDU from the port you specified.

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