Configuring The Path Cost Of A Port - H3C S9500 Series Operation Manual

Operation Manual – STP
H3C S9500 Series Routing Switches
After configured as an edge port, the port can fast transit from blocking state to
forwarding state without any delay. You can only set the port connecting with the
terminal as an edge port. The configuration of this parameter takes effect on all the
STIs. In other words, if a port is configured as an edge port or non-edge port, it is
configured the same on all the STIs.
If BPDU protection is enabled on the switch, the edged port is disabled when it receives
BPDU packets from the user. Only the network administrators can enable the port.
By default, all the Ethernet ports of the switch have been configured as non-edge ports.
Note:
It is better to configure the port directly connected with the terminal as an edge port,
and enable the BPDU function on the port. That is, to realize fast state-transition
and prevent the switch from being attacked.
Caution:
If STP has been enabled on the equipment connected to the switch, do not
configure the edged ports on the equipment. Otherwise the system will fail to delete
MAC address entries and ARP address entries on the port.

1.2.11 Configuring the Path Cost of a Port

Path Cost is related to the speed of the link connected to the port. On the MSTP switch,
a port can be configured with different path costs for different STIs. Thus the traffic from
different VLANs can run over different physical links, thereby implementing the
VLAN-based load-balancing.
You can configure the path cost of a port in the following ways.
I. Configuration in system view
Perform the following configuration in system view.
Chapter 1 MSTP Region-configuration
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