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determine which port of a bridge would become the Root Port. The
range is 0 – 240. Default is 128.
Admin Edge Port:
If user selects "Yes", 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 imme-
diately transit to forwarding state and skip the listening and learning
state because the edge ports cannot create bridging loops in the net-
work. This will expedite the convergence. When the link on the edge
port toggles, the STP topology keeps unchanged. Unlike the designate
port or root port though, an edge port will transit to a normal span-
ning-tree port immediately if it receives a BPDU. Default: No
Admin Point To Point:
Say a port is a point-to-point link, from RSTP's view, if it is in full-dup-
lex mode but is shared link if it is in half-duplex mode. RSTP fast con-
vergence can only happen on point-to-point links and on edge ports.
This can expedite the convergence because this will have the port fast
transited to forwarding state.
There are three parameters, Auto, True and 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 resulted from the auto-
negotiation. In today's switched networks, most links are running in
full-duplex mode. For sure, the result may be half-duplex, in this case,
the port will not fast transit to Forwarding state. If it is set as True, the
port is treated as point-to-point link by RSTP and unconditionally
transited to Forwarding state. If it is set as False, fast transition to For-
warding state will not happen on this port. Default: Auto
M Check:
Migration Check. It forces the port sending 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 get back to act as an RSTP port.
Click <M Check> button to send a RSTP BPDU from the port you spe-
cified.
4.15
Configuration: MSTP
The implementation of MSTP is according to IEEE 802.1Q 2005 Clause 13 -
Multiple Spanning Tree Protocol. MSTP allows frames assigned to different
Chapter 4: Operation of Web- based Management
LANCOM GS-2124
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