Siemens RUGGEDCOM ROX II User Manual page 690

Chapter 14
Network Redundancy
Section 14.3.5
Configuring STP for Switched Ethernet Ports and Ethernet
Trunk Interfaces
To configure the Spanning Tree Protocol (STP) for a switched Ethernet port, do the following:
1. Make sure the CLI is in Configuration mode.
2. Navigate to:
• For switched Ethernet ports:
interface » switch » {interface} » spanning-tree, where {interface} is the name given to the switched
Ethernet port.
• For Ethernet trunk interfaces:
interface » trunks » {id} » spanning-tree, where {id} is the ID given to the interface.
3. Configure the following parameter(s):
Parameter
enabled
admin-edge { admin-edge }
admin-point-to-point { admin-point-to-
point }
restricted-role
restricted-tcn
rstp-priority { rstp-priority }
stp-cost { stp-cost }
644
Synopsis: { true, false }
Default: true
Enables/disables STP/RSTP on the interface.
Synopsis: { forceTrue, forceFalse, auto }
Default: auto
Edge ports are ports that do not participate in the spanning tree, but still send
configuration messages. Edge ports transition directly to frame forwarding without
any listening and learning delays. The MAC tables of edge ports do not need to be
flushed when topology changes occur in the STP network. Unlike an STP-disabled port,
accidentally connecting an edge port to another port in the spanning tree will result in
a detectable loop. The Edgeness of the port will be switched off and the standard RSTP
rules will apply (until the next link outage).
Synopsis: { forceTrue, forceFalse, auto }
Default: auto
RSTP uses a peer-to-peer protocol that provides for rapid transitioning on point-to-point
links. This protocol is automatically turned off in situations where multiple STP bridges
communicate over a shared (non point-to-point) LAN. The bridge will automatically take
point-to-point to be true when the link is found to be operating in full-duplex mode. The
point-to-point parameter allows this behavior or overrides it, forcing point-to-point to
be true or false. Force the parameter true when the port operates a point-to-point link
but cannot run the link in full-duplex mode. Force the parameter false when the port
operates the link in full-duplex mode, but is still not point-to-point (e.g. a full-duplex link
to an unmanaged bridge that concentrates two other STP bridges).
If enabled, causes the port not to be selected as the root port for the CIST or any MSTI,
even though it has the best spanning tree priority vector. This parameter should be
FALSE by default.
If TRUE, causes the port not to propagate received topology change notifications and
topology changes to other ports. This parameter should be FALSE by default. If set, it can
cause a temporary loss of connectivity after changes in a spanning tree's active topology
as a result of persistent, incorrectly learned station location information.
Synopsis: { 0, 16, 32, 64, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240 }
Default: 128
The STP port priority. Ports of the same cost that attach to a common LAN will select the
port to be used based upon the port priority.
Synopsis: { auto-cost } or a 32-bit unsigned integer between 0 and 65535
Default: auto-cost
Configuring STP for Switched Ethernet Ports and Ethernet
Description
RUGGEDCOM ROX II
CLI User Guide
Trunk Interfaces