HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 2 - LAN Switching Co - Page 86

Enabling outputting port state transition information, Enabling the spanning tree feature

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MSTP provides MSTP packet format incompatibility guard. In MSTP mode, if a port is configured to recognize/send MSTP packets in a mode other than auto, and if it receives a packet in a format different from the specified type, the port becomes a designated port and remains in the discarding state to prevent the occurrence of a loop. MSTP provides MSTP packet format frequent change guard. If a port receives MSTP packets of different formats frequently, the MSTP packet format configuration contains errors. If the port is operating in MSTP mode, it will be shut down for protection. Ports disabled in this way can be re-activated after a detection interval. For more information about the detection interval, see Fundamentals Configuration Guide. To configure the MSTP packet format to be supported on a port: Step 1. Enter system view. Command system-view Remarks N/A 2. Enter Layer 2 Ethernet interface view or Layer 2 aggregate interface interface interface-type interface-number view. N/A 3. Configure the mode that the port uses to recognize/send MSTP stp compliance { auto | dot1s | legacy } packets. auto by default. Enabling outputting port state transition information In a large-scale spanning tree network, you can enable devices to output the port state transition information of all MSTIs or the specified MSTI in order to monitor the port states in real time. To enable outputting port state transition information: Step 1. Enter system view. Command system-view Remarks N/A 2. Enable outputting port state transition information. • In STP/RSTP mode: stp port-log instance 0 • In MSTP mode: stp port-log instance { instance-id | all } Use one of the commands. Enabled by default. Enabling the spanning tree feature You must enable the spanning tree feature for the device before any other spanning tree related configurations can take effect. Make sure that the spanning tree feature is enabled globally and on the desired ports. You can disable the spanning tree feature for certain ports with the undo stp enable command to exclude them from spanning tree calculation and save CPU resources of the device. 77

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77
MSTP provides MSTP packet format incompatibility guard. In MSTP mode, if a port is configured to
recognize/send MSTP packets in a mode other than
auto
, and if it receives a packet in a format different
from the specified type, the port becomes a designated port and remains in the discarding state to
prevent the occurrence of a loop.
MSTP provides MSTP packet format frequent change guard. If a port receives MSTP packets of different
formats frequently, the MSTP packet format configuration contains errors. If the port is operating in MSTP
mode, it will be shut down for protection. Ports disabled in this way can be re-activated after a detection
interval. For more information about the detection interval, see
Fundamentals Configuration Guide
.
To configure the MSTP packet format to be supported on a port:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface
view.
interface
interface-type interface-number
N/A
3.
Configure the mode that
the port uses to
recognize/send MSTP
packets.
stp compliance
{
auto
|
dot1s
|
legacy
}
auto
by default.
Enabling outputting port state transition information
In a large-scale spanning tree network, you can enable devices to output the port state transition
information of all MSTIs or the specified MSTI in order to monitor the port states in real time.
To enable outputting port state transition information:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable outputting port
state transition
information.
•
In STP/RSTP mode:
stp port-log instance 0
•
In MSTP mode:
stp port-log instance
{
instance-id
|
all
}
Use one of the commands.
Enabled by default.
Enabling the spanning tree feature
You must enable the spanning tree feature for the device before any other spanning tree related
configurations can take effect.
Make sure that the spanning tree feature is enabled globally and on the desired ports.
You can disable the spanning tree feature for certain ports with the
undo stp enable
command to exclude
them from spanning tree calculation and save CPU resources of the device.