Related Commands - H3C S5150-EI Series Troubleshooting Manual

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Installation manual (73 pages)

Configuration manual (59 pages)

Command reference manual (2923 pages)

Table Of Contents

Table of Contents

Execute the display stp brief command to verify that STP does not set the state of the port

to discarding. When the port is in discarding state, it cannot forward traffic. H3C

recommends that you disable STP on the port, or configure the port as an edge port if the

port is connected to a terminal device.

If the port belongs to an aggregation group, execute the display link-aggregation verbose

command to identify the port status. When the port is an Unselected port, it cannot forward

traffic. Locate the reasons why the port is in Unselected state. For example, the attribute

configurations of the port are different from the configurations of the reference port.

If the port belongs to a smart link group, execute the display smart-link group command to

verify the port status. The port cannot forward packets if its state is standby or down. If the

port is standby, configure the port as a primary port. If the port is down, verify the causes and

resolve the problem as required. A port might go down if the uplink device is configured with

the monitor link function, the port is shut down, or the link fails.

Examine the following configurations that might cause packet loss:

VLAN configuration—Execute the display this command in Ethernet interface view to

verify that the port is in the VLAN of the packets. If it is not, add the port to the VLAN.

Blackhole MAC address entries—Execute the display mac-address blackhole

command to display blackhole MAC address entries. If the packets are discarded because

they match a blackhole MAC address entry, delete the entry. To delete the blackhole MAC

address entry, execute the undo mac-address blackhole mac-address vlan vlan-id

command.

Rate limit—Execute the display qos lr interface command to display the rate limit

configuration on the port. If rate limit is configured on the port, make sure the committed

information rate (CIR) and the committed burst size (CBS) are appropriate. To adjust the

CIR and CBS values, execute the qos lr { inbound | outbound } cir

committed-information-rate [ cbs committed-burst-size ] command.

Storm suppression—Execute the display this command in Ethernet interface view to

display the configuration of storm suppression. Storm suppression includes broadcast

suppression, multicast suppression, and unknown unicast suppression. To adjust the

suppression thresholds, execute the broadcast-suppression, multicast-suppression,

and unicast-suppression commands, respectively.

Verify that no congestion occurs by using the display qos queue interface command.

If congestion occurs, locate and resolve the problem by referencing related congestion

management documents.

If the problem persists, contact H3C Support.