R2511-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V5)

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Configuring the port priority
The priority of a port is an important factor in determining whether the port can be elected as the root
port of a device. If all other conditions are the same, the port with the highest priority will be elected as
the root port.
On a spanning tree device, a port can have different priorities and play different roles in different
spanning trees, so that data from different VLANs can be propagated along different physical paths to
implement per-VLAN load balancing. You can set port priority values based on your actual network
requirements.
If the port priority changes, the system re-calculates the port role and initiates a state transition.
To configure the priority of a port or a group of ports:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view or
port group view.
• Enter Ethernet interface view or Layer 2
aggregate interface view:
interface interface-type interface-number
• Enter port group view:
port-group manual port-group-name
Use one of the commands.
3. Configure the port
priority.
• In STP/RSTP mode:
stp port priority priority
• In MSTP mode:
stp [ instance instance-id ] port priority
priority
Use one of the commands.
The default setting is 128.
Configuring the port link type
A point-to-point link directly connects two devices. If two root ports or designated ports are connected
over a point-to-point link, they can rapidly transit to the forwarding state after a proposal-agreement
handshake process.
Configuration restrictions and guidelines
• You can configure the link type as point-to-point for a Layer 2 aggregate interface or a port that
operates in full duplex mode. HP recommends that you use the default setting and let the device to
automatically detect the port link type.
• The stp point-to-point force-false or stp point-to-point force-true command configured on a port in
MSTP mode is effective on all MSTIs.
• If the physical link to which the port connects is not a point-to-point link but you set it to be one, the
configuration might cause temporary loops.
Configuration procedure
To configure the link type of a port or a group of ports: