ALM-303046929 A Port Enters the Discarding State

Description

MSTP/4/PDISC:OID [OID] The port has been set to discarding state. (InstanceID=[INTEGER], PortInstanceID=[INTEGER], PortID=[INTEGER], IfIndex=[INTEGER], PortName=[STRING])

The link status changed, and the port enters the Discarding state.

Attribute

Alarm ID	Alarm Severity	Alarm Type
303046929	Warning	Communication alarm

Parameters

Name	Meaning
OID	Indicates the MIB object ID of the alarm.
InstanceID	Indicates the instance ID.
PortInstanceID	Indicates the ID of the instance to which the interface belongs.
PortID	Indicates the port ID.
IfIndex	Indicates the interface index.
PortName	Indicates the interface name.

Impact on the System

The link status changes, and the link exits the topology.

Possible Causes

1. The network topology changes that the port changes from the Forwarding state into the Discarding state.

2. A new link is added. After the topology calculation, the port enters the Discarding state.

Procedure

View physical devices on the network to check whether new physical connections enabled with STP are added.
- If so, go to Step 2.
- If not, go to Step 3.
Check whether the added physical link is necessary.
- If so, go to Step 3.
- If not, go to Step 4.
Run the display stp [ instance instance-id ] [ interface interface-type interface-number ] [ brief ] command to check whether the interfaces are consistent with the STP calculation results.
- If so, go to Step 6.
- If not, go to Step 5.
Correctly deploy the network topology, and then check whether the alarm is cleared.
- If the alarm is cleared, go to Step 6.
- If the alarm is not cleared, go to Step 3.
Collect alarm information and configuration information, and then contact technical support personnel.
End.

Procedure

Check the physical devices in the network topology, whether there is a new physical link with the spanning tree protocol enabled, and check whether the newly added physical link is the required physical link.