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Configuring Spanning Tree Port Parameters Configuring Spanning Tree Parameters
page 5-26 OmniSwitch 6600 Family Network Configuration Guide April 2006
To change the path cost value for a link aggregate, use the bridge slot/port path cost commands
described above, but specify a link aggregate control number instead of a slot and port. For example, the
following command sets the path cost for link aggregate 10 associated with VLAN 755 to 19:
-> bridge 755 10 path cost 19
For more information about configuring an aggregate of ports, see Chapter 12, “Configuring Static Link
Aggregation,” and Chapter 13, “Configuring Dynamic Link Aggregation.”
Configuring Port Mode
There are two port modes supported: manual and dynamic. Manual mode indicates that the port was set by
the user to a forwarding or blocking state. The port will operate in the state selected until the state is manu-
ally changed again or the port mode is changed to dynamic. Ports operating in a manual mode state do not
participate in the Spanning Tree Algorithm. Dynamic mode indicates that the active Spanning Tree Algo-
rithm will determine port state.
By default, Spanning Tree is enabled on the port and the port operates in the dynamic mode. If the switch
is running in the 1x1 Spanning Tree mode, then the port mode applies to the specified VLAN instance
associated with the port. If the switch is running in the flat Spanning Tree mode, then the port mode
applies across all VLANs associated with the port. The flat mode instance is specified as the port’s
instance, even if the port is associated with other VLANs.
To change the port Spanning Tree mode for a VLAN instance, specify a VLAN ID with the bridge slot/
port mode command when the switch is running in the 1x1 mode. For example, the following command
sets the mode for port 8/1 for VLAN 10 to forwarding.
-> bridge 10 8/1 mode forwarding
The explicit bridge 1x1 slot/port mode command configures the port mode for a VLAN instance when
the switch is running in either mode (1x1 or flat). For example, the following command performs the same
function as the command in the previous example:
-> bridge 1x1 10 8/1 mode forwarding
To change the port Spanning Tree mode for the flat mode instance, use either the bridge slot/port mode
command or the bridge cist slot/port mode command. Note that both commands are available when the
switch is running in either mode (1x1 or flat) and an instance number is not required. For example, the
following commands configure the Spanning Tree mode on port 1/24 for the flat mode instance:
-> bridge 1/24 mode blocking
-> bridge cist 1/24 mode blocking
As in previous releases, it is possible to configure the flat mode instance with the bridge slot/port mode
command by specifying 1 as the instance number (e.g., bridge 1 1/24 mode dynamic). However, this is
only available when the switch is already running in the flat mode and STP or RSTP is the active protocol.
16 5
1 Gbps N/A 3
10 Gbps N/A 1
Link Speed
Aggregate Size
(number of links)
Default Path
Cost Value