Stp Cost - 3Com 8807 Command Reference Manual

182 C 13: MSTP C C
HAPTER ONFIGURATION OMMANDS
Description
Use the stp compliance command to set the format of the packets that the
current port sends and receives. You can configure the format to legacy, dot1s,
or auto.
By default, the port sends the packets in the legacy format.
Example
# Set Ethernet2/1/1 to the auto mode.
<SW8800>system-view
System View: return to User View with Ctrl+Z.
[SW8800] interface Ethernet2/1/1
[3Com-Ethernet2/1/1] stp compliance auto

stp cost

Syntax
stp [ instance instance-id ] cost cost
undo stp [ instance instance-id ] cost
View
Ethernet port view
Parameter
instance instance-id: Specifies the spanning tree instance ID, ranging from 0 to
48. The Instance 0 represents CIST.
cost cost: Port path cost. Its range depends on the selected standard of path cost.
Description
Use the stp instance cost command to configure the port path cost on the
specified MSTI for the current port.
Use the undo stp instance cost command to restore the path cost on the
specified MSTI.
By default, switch calculates the path costs of a port on different MSTIs.
You may specify the instance-id parameter as 0 to configure CIST path cost of the
port. The path cost has effect on the port role selection. A port can be configured
with different path costs on different MSTIs. Thus the traffic from different VLANs
can run over different physical links, thereby implementing the VLAN-based
load-balancing. MSTP will recalculate the port role and transit its state, upon the
port path cost changes.
Related command: stp interface instance cost.
Example
# Set the path cost of Ethernet 2/1/3 on MSTI 2 to 200.
<SW8800>system-view
System View: return to User View with Ctrl+Z.
[SW8800] interface Ethernet 2/1/3
[3Com-Ethernet2/1/3] stp instance 2 cost 200