
Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 164 of 669
CIST Ports
CIST (Common and Internal Spanning Tree) Port configuration is done from the
Configuration >
Spanning Tree
>
CIST Ports
menu path.
The CIST is the default spanning tree instance of MSTP (i.e. all VLANs that are not members of particular
MSTIs are members of the CIST). Also, an individual MST region can be regarded a single virtual bridge
by other MST regions. The spanning tree that runs between regions is the CIST.
This page lets you view and/or edit the current STP CIST port configurations and contains settings for
physical (Normal) and aggregated ports.
Point-to-Point and Edge Ports selections apply to RSTP only. Part of the task of configuring RSTP is
defining the port types on the bridge, which is directly related to the device(s) connected to the port.
With the port types defined, RSTP can reconfigure a network much quicker than STP when a change in
network topology is detected. The two possible selections are
Non-Edge
(Point-to-point) port or
Edge
port.
If a bridge port is connected to another bridge or router port, it normally operates in full-duplex mode and
is functioning as a point-to-point port.
A port operates as an edge port when it is connected to a network terminal device such as a workstation
or a server. An edge port on a bridge should not have any STP or RSTP devices connected to it either
directly or through another device connected to that port. In this configuration since the port has no STP
or RSTP devices connected to it, it will always forward network traffic.
Port
The S4224 port number of the logical STP port. The
*
in the Port column acts as a ‘wild card’
character which causes the selections in this row to be applied to all other Ports (rows) in the table for
which this selection is valid.
STP Enabled
Controls whether STP is enabled on this S4224 port. Note that STP on MGMT / Port 1 is disabled by
default.