Configuring STP Port Parameters Configuring Spanning Tree Parameters
page 7-38 OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008
Restricting Port Roles
By default, all ports are eligible for root port selection. A port in a CIST instance or 1x1 instance can be
retricted from becoming a root port as explained below:
A port in CIST/MSTI instance can be restricted from becoming the root port by using the bridge cist slot/
port restricted-role command. Similarly a port in 1x1 instance can be restricted by using the bridge 1x1
slot/port restricted-role command.
To restrict a port in CIST instance from becoming the root port, enter the following command:
-> bridge cist 15 restricted-role enable
When restricted-role is enabled for a port, it cannot become the root port, even if it is the most likely
candidate for becoming the root port. It will be selected as the alternate port when the root port is selected.
Restricting TCN Propagation
By default, all the ports propagate Topology Change Notifications (TCN) or Topology Changes (TC) to
other ports.
A port in CIST instance can be restricted from propagating Topology Change Notification (TCN) using
the bridge cist slot/port restricted-tcn command. Similarly a port in 1x1 instance can be restricted by
using the bridge 1x1 slot/port restricted-tcn command.
For example, to restrict the port 2/2 from propagating the received TCNs and TCs to the other ports, enter
the following command:
-> bridge cist 2/2 restricted-tcn enable
Limiting BPDU Transmission
The number of BPDUs to be transmitted per port per second can be limited using the bridge cist txhold-
count command for a CIST instance or bridge 1x1 txholdcount commands for a 1x1 instance.
For example, to limit the number of BPDUs to be transmitted by a port in CIST instance to 5, enter the
following command:
-> bridge cist txholdcount 5
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