Enabling Port State Transition Information Output - HP A5830 Configuration Manual

 dot1s—802.1s-compliant standard format
 legacy—Compatible format
By default, the packet format recognition mode of a port is auto. The port automatically distinguishes the
two MSTP packet formats, and determines the format of packets that it will send based on the recognized
format.
Configure the MSTP packet format on a port. When working in MSTP mode after the configuration, the
port sends and receives only MSTP packets of the format that you have configured to communicate with
devices that send packets of the same format.
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 working in MSTP
mode, it is 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 or a group of ports:
Step...
1. Enter system view
2. Enter
interface
view or
port
group
view
3. Configure the mode that the port uses
to recognize/send MSTP packets

Enabling port state transition information output

In a large-scale spanning tree network, 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 output of port state transition information:
Step...
1. Enter system view
2. Enable output of port state
transition information (in
STP/RSTP mode)
3. Enable output of port state
transition information (in PVST
mode)
4. Enable output of port state
transition information (in MSTP
mode)
Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view
Enter port group view
Command...
system-view
stp port-log instance 0
stp port-log vlan vlan-list
stp port-log instance { instance-id |
all }
Command...
system-view
interface interface-type interface-
number
port-group manual port-group-name
stp compliance { auto | dot1s |
legacy }
74
Remarks
—
Required
Use either command
Required
auto by default
Remarks
—
Required
Use any command
Enabled by default