Alloy Computer Products GSM-8T16SFP - Manual (Page 88)

GSM Series User Manual
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Alloy Computer Products Pty Ltd Copyright ©2006
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.