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LGB5128A User Manual
66
Parameter description:
Port:
The physical port index available value is 1 to 24.
Instance :
Every MRSTP instance must have a unique instance ID.
Path Cost :
Select “Auto” or “Specific.” If you select Specific, then you need to assign the
path cost value. The available range is from 1 to 200,000,000.
The same definition as in the RSTP specification. But in MRSTP, this parameter
can be respectively applied to ports of CIST and ports of any MSTI.
Priority :
The available value: 0 / 16 / 32 / 48 / 64 / 80 / 96 / 112 / 128 / 144 / 160 /
176 / 192 / 208 / 224 / 240
Priority has the same definition as in the RSTP specification. But in MSTP, this
parameter can be respectively applied to ports of CIST and ports of any MSTI.
Admin Edge :
Scroll this parameter to select “Edge/Non-Edge.”
If user selects “Edge,” 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 the edge
ports cannot create bridging loops in the network. This will expedite the
convergence. When the link on the edge port toggles, the STP topology
remains unchanged. Unlike the designated port or root port though, an edge
port will transit to a normal spanning-tree port immediately if it receives a
BPDU.
Default: Edge.
Admin P2P :
Scroll this parameter to select “Auto/Force True/Force False.”
We say a port is a point-to-point link, from RSTP’s view, if it is in full-duplex
mode, but is a shared link if it is in half-duplex mode. RSTP fast convergence
can only happen on point-to-point links and on edge ports. This can expedite
the convergence because this will fast transition the port to forwarding state.
There are three parameters, Auto, Force True, and Force False, used to
configure the type of the point-to-point link. If configure this parameter to be
Auto, it means RSTP will use the duplex mode resulting from the auto-
negotiation. In today’s switched networks, most links are running in full-duplex
mode. The result may be half-duplex, in this case, the port will not fast
transition to Forwarding state. If it is set as True, the port is treated as point-
to-point link by RSTP and unconditionally transitioned to Forwarding state. If it
is set as False, fast transition to Forwarding state will not happen on this port.
Default: Auto
Buttons
Save – Click to save changes.
Reset- Click to undo any changes made locally and revert to previously saved
values.