Related Commands; Layer 2 Forwarding Failure; Symptom - HP 5500 SI Troubleshooting Manual

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MSTP
Use the display stp bpdu-statistics interface command to view the statistics for received and
sent BPDU packets on ports. Examine the counts of TCN/TC packets. If the switch receives a
large quantity of TCN/TC packets generated by STP, the switch has to delete MAC address
entries frequently. This results in high CPU usage.
AGNT
Examine the network management software. Frequent MIB information browsing might result
in high CPU usage.
ROUT
Use the display ip routing-table command to examine route changes. Route flapping might
cause high CPU usage.
L2X0 or L2X1 MAC address synchronization
Examine whether the network topology is stable. If the network topology is not stable, the
device has to use a lot of CPU resources to update its MAC address entries frequently.
3. If the problem persists, contact HP Support.

Related commands

This section lists the commands that you might use for troubleshooting high CPU usage.
Command
_hidecmd
display cpu-usage task [ slot slot-id ]
display interface
display ip routing-table
display stp bpdu-statistics interface

Layer 2 forwarding failure

Symptom

Layer 2 packet loss occurs between two devices on the same network segment and in the same VLAN.
Use the display interface command to see whether interfaces have received large amounts
of broadcast packets.
Identify whether a loop exists on the network. If a loop exists, examine the connections
between the devices.
Description
Enters hidden view.
Displays CPU usage information. This command is available in
hidden view.
Displays Ethernet interface information.
Displays brief information about active routes in the routing
table.
Displays the BPDU statistics for a port.
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