HP 3100 Series User Manual

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calculation formula of IEEE 802.1t is: Path cost = 200,000,000/link speed (in 100 kbps), where
link speed is the sum of the link speed values of the Selected ports in the aggregation group.
• When multiple ports operate at a rate higher than 10 Gbps and the standard for default path
cost calculation is dot1d-1998 or legacy, the path cost of a single port or an aggregate
interface takes the smallest value. As a result, the forwarding path selected might not be
optimal. To solve this problem, use dot1t as the standard for default path cost calculation, or
manually set the path cost for a port (Configuring path costs of ports).
Configuration procedure
To specify a standard for the device to use when it calculates the default path cost:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Specify a standard for the
device to use when it
calculates the default path
costs of its ports.
stp pathcost-standard
{
dot1d-1998
|
dot1t
|
legacy
}
Optional.
legacy
by default.
Configuring path costs of ports
When the path cost of a port changes, the system re-calculates the role of the port and initiates a
state transition.
To configure the path cost of ports:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view or port
group view.
• Enter Layer 2 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 path cost of
the ports.
• In STP/RSTP mode:
stp cost cost
• In PVST mode:
stp vlan vlan-list cost cost
• In MSTP mode:
stp [ instance instance-id ] cost
cost
Use one of the commands.
By default, the system
automatically calculates
the path cost of each port.
Configuration example
# In MSTP mode, specify the device to calculate the default path costs of its ports by using IEEE
802.1d-1998, and set the path cost of Ethernet 1/0/3 to 200 on MSTI 2.
<Sysname> system-view
[Sysname] stp pathcost-standard dot1d-1998
[Sysname] interface ethernet 1/0/3
[Sysname-Ethernet1/0/3] stp instance 2 cost 200

HP 3100 Series Specifications

General

Layer	Layer 2
Jumbo Frame Support	Yes
Switching Capacity	8.8 Gbps
MAC Address Table Size	8000 entries
Management	Web interface, SNMP, CLI
Operating Temperature	0 to 45°C (32 to 113°F)
Operating Humidity	10% to 90% non-condensing
Dimensions	44(H) x 440(W) x 173(D) mm