H3C s5820x series Troubleshooting Manual

H3C S5820X & S5800 Switch Series

Troubleshooting Guide

No part of this manual may be reproduced or transmitted in any form or by any means

without prior written consent of Hangzhou H3C Technologies Co., Ltd.

The information in this document is subject to change without notice.

i

Contents

Introduction ··································································································································································· 1

Troubleshooting ACL ···················································································································································· 1

ACL application failure with an error message ············································································································· 1

Symptom ···································································································································································· 1

Solution ······································································································································································ 1

ACL application failure without an error message ········································································································ 1

Symptom ···································································································································································· 1

Troubleshooting flowchart ······································································································································· 2

Solution ······································································································································································ 2

Related commands ···························································································································································· 3

Troubleshooting IRF ······················································································································································ 4

IRF fabric establishment failure ········································································································································ 4

Symptom ···································································································································································· 4

Troubleshooting flowchart ······································································································································· 5

Solution ······································································································································································ 6

Related commands ···························································································································································· 7

Troubleshooting Ethernet link aggregation ················································································································· 8

Link aggregation failure ··················································································································································· 8

Symptom ···································································································································································· 8

Troubleshooting flowchart ······································································································································· 9

Solution ······································································································································································ 9

Related commands ························································································································································· 10

Troubleshooting ports ················································································································································· 13

Link up failure on a port ················································································································································ 13

Symptom ································································································································································· 13

Troubleshooting flowchart ···································································································································· 13

Solution ··································································································································································· 13

Related commands ························································································································································· 15

Troubleshooting other problems ································································································································ 16

Layer 2 forwarding failure ············································································································································ 16

Symptom ································································································································································· 16

Troubleshooting flowchart ···································································································································· 16

Solution ··································································································································································· 17

Related commands ················································································································································ 19

Layer 3 forwarding failure ············································································································································ 20

Symptom ································································································································································· 20

Troubleshooting flowchart ···································································································································· 20

Solution ··································································································································································· 20

Related commands ················································································································································ 21

SFP+ port not coming up ··············································································································································· 21

Symptom ································································································································································· 21

Troubleshooting flowchart ···································································································································· 22

Solution ··································································································································································· 22

Related commands ················································································································································ 22

PoE power supply anomaly ·········································································································································· 23

Symptom ································································································································································· 23

ii

Troubleshooting flowchart ···································································································································· 23

Solution ··································································································································································· 23

Related commands ················································································································································ 25

1

Introduction

This document is not specific to any software version or device model.

Troubleshooting ACL

This section provides troubleshooting information for common problems with ACLs.

ACL application failure with an error message

Symptom

The system fails to apply a packet filter or ACL-based classifiers in a QoS policy to the hardware. It also

displays the "Reason: Not enough hardware resource" message.

Solution

To resolve this problem:

1. Execute the display acl resource command, and then check the Remaining field for ACL resources

insufficiency.

If this field displays 0, the ACL hardware resources are exhausted.

2. To free hardware resources, remove unused packet filters or ACL-based classifiers from QoS

policies.

3. If the problem persists, contact H3C Support.

ACL application failure without an error message

Symptom

The system applies a packet filter or a QoS policy that contains ACLs to the hardware. However, the ACL

does not take effect.

2

Troubleshooting flowchart

Figure 1 Troubleshooting an ACL application failure

Solution

Choose a solution depending on the module that uses the ACL.

ACL used in a QoS policy

To resolve the problem when the ACL is used in a QoS policy:

1. Verify that the QoS policy is configured correctly:

a. Use one of the following commands to check the QoS policy for configuration errors,

depending on the policy application destination:

Destination Command

Interface

display qos policy interface

VLAN

display qos vlan-policy

Global

display qos policy global

Control plane

display qos policy control-plane slot

slot-number

b. If the QoS policy does not contain a class-behavior association, associate the traffic behavior

with the traffic class.

c. If the QoS policy contains a class-behavior association, execute the display traffic classifier

user-defined command and the display traffic behavior user-defined command to check for

traffic class and behavior configuration errors, respectively.

End

Failure to apply an ACL

Contact H3C Support

No

Yes

Resolved?

No

Yes

Reconfigure QoS

policy/packet filter

Yes

No

ACL rule

configured correctly?

QoS policy/packet filter

configured correctly?

Reconfigure ACL rule

Resolved?

No

Yes

3

− If they are configured incorrectly, reconfigure them.

− If they are configured correctly, go to Step 2.

2. Verify that the ACL is configured correctly.

Execute the display acl command to check whether the ACL is configured correctly.

{ If the ACL is configured incorrectly, reconfigure it.

{ If the ACL is configured correctly but the problem persists, contact H3C Support.

3. If the problem persists, contact H3C Support.

ACL used in a packet filter

To resolve the problem when the ACL is used in a packet filter:

1. Verify that the packet filter configuration is correct:

a. Execute the display packet-filter command.

b. If there are any configuration errors, reconfigure the packet filter.

2. Verify that the ACL configuration is correct:

a. Execute the display acl command.

b. If there are any configuration errors, reconfigure the ACL.

3. If the problem persists, contact H3C Support.

Related commands

This section lists the commands that you might use for troubleshooting ACLs.

Command Descri

p

tion

display acl resource

Displays information about hardware resources for ACL

applications.

display qos policy interface

Displays information about the QoS policies applied to an

interface or to all interfaces.

display qos vlan-policy Displays information about QoS policies applied to VLANs.

display qos policy global Displays information about global QoS policies.

display qos policy control-plane

Displays information about the QoS policies applied to the

specified control plane.

display traffic classifier user-defined Displays traffic class configurations.

display traffic behavior user-defined Displays traffic behavior configurations.

display packet-filter

Displays whether an ACL has been successfully applied to an

interface for packet filtering.

4

Troubleshooting IRF

This section provides troubleshooting information for common problems with IRF.

IRF fabric establishment failure

Symptom

An IRF fabric cannot be established.

5

Troubleshooting flowchart

Figure 2 Troubleshooting IRF fabric establishment failure

No

Yes

No

Yes

No

Yes

End

IRF fabric setup failed

No

Yes

Contact H3C Support

No

Yes

Resolved?

No

Yes

No

Yes

No

Yes

Remove excess

member chassis

Yes

No

All member IDs are unique?

Modify bindings or

reconnect physical ports

IRF fabric size allowed?

Physical IRF

connections consistent with

IRF port bindings?

No

Resolved?

IRF links up?

Bring up physical

ports/activate IRF port

configuration

Resolved?

All chassis use same

software version?

Upgrade software

version to be the same

Resolved?

Software versions

compatible?

Upgrade software Resolved?

Change member IDs

Resolved?

No

Yes

10-Gbps IRF links used?

Yes

No

Yes

Replace with 10 Gbps

or SFP+ transceiver

modules/cables

No

Resolved?

6

Solution

To resolve the problem:

1. Verify that the number of member chassis does not exceed the upper limit (nine).

If you are adding new chassis to an existing IRF fabric, use the display irf command to identify the

number of member chassis already in the chassis.

2. Verify that the member ID of each member chassis is unique:

a. Execute the display irf configuration command to view the member ID of each chassis.

b. If two member chassis use duplicate IDs, assign a unique member ID to each member.

3. Verify that the physical IRF links are connected correctly:

IMPORTANT:

W

hen you connect two neighboring IRF members, you must connect the physical ports of IRF-port 1

on one member to the physical ports of IRF-port 2 on the other.

a. Execute the display irf configuration command on each member chassis, and check the

IRF-Port1 and IRF-Port2 fields for IRF port bindings.

b. Verify that the physical IRF connections are consistent with the IRF port bindings.

c. If there are inconsistencies, reconfigure the IRF port bindings or reconnect the physical IRF

ports.

4. Verify that IRF links are 10 Gbps:

a. Verify that the transceiver modules or cables for IRF connection are labeled with 10Gbps or

SFP+.

b. Replace a transceiver module or cable if it is not for 10 Gbps connection.

5. Verify that all IRF links are up:

a. Execute the display irf topology command, and then check the Link field.

b. If the Link field for an IRF port displays DOWN, execute the display interface command, and

then check the current state field.

− If all physical ports bound to the IRF port are down, bring them up.

− If the IRF port has at least one physical port in up state, proceed to the next step.

c. Save the configuration, and then execute the irf-port-configuration active command in system

view to activate the IRF port configuration.

IMPORTANT:

A

ctivatin

g

IRF port confi

g

uration requires a reboot. To prevent confi

g

uration loss, you must save

the configuration before you execute the irf-port-configuration active command.

6. Verify that all member chassis use the same software version:

a. Execute the display version command to identify the software version of each member device.

b. Upgrade the software of all member chassis to the same version.

7

NOTE:

Typically the irf auto-update enable command can automatically synchronize a member chassis with

the software version of the master chassis. However, the synchronization might fail when the gap

between the software versions is large.

7. If the problem persists, contact H3C Support.

Related commands

This section lists the commands that you might use for troubleshooting IRF.

Command Descri

p

tion

display interface

Displays interface information.

Use this command to verify that each IRF port has at least one

physical port in up state.

display irf

Displays IRF fabric information, including the member ID,

role, priority, bridge MAC address, and description of each

IRF member.

display irf configuration

Displays basic IRF settings, including the current member ID,

new member ID, and physical ports bound to the IRF ports on

each IRF member device. The new member IDs take effect at

reboot.

display irf topology

Displays the IRF fabric topology, including the member IDs,

IRF port state, and adjacencies of IRF ports.

display version Displays system version information.

irf-port-configuration active Activates IRF configuration on IRF ports.

8

Troubleshooting Ethernet link aggregation

This section provides troubleshooting information for common problems with Ethernet link aggregation.

Link aggregation failure

Symptom

Link aggregation does not operate correctly.

9

Troubleshooting flowchart

Figure 3 Troubleshooting link aggregation failure

Solution

To resolve the problem:

1. Verify that all physical connections are correct.

You can verify the physical connections against your network plan.

2. Verify that all member ports are up:

Are all physical connections correct?

Are all member ports up?

Connect physical links correctly

Bring all member ports up

No

Yes

No

Yes

Attribute configurations/class-two

configurations same as the reference port?

Set attribute configurations/class-two

configurations same as the reference

port

No

Yes

Set no more than 8 member ports

Yes

No

More than 8 member ports?

Attribute configurations/class-two configurations of the

peer ports same as the peer port of the reference port?

Set attribute configurations/class-two

configurations of the peer ports same

as the peer port of the reference port

No

Yes

End

Link aggregation

failed

Link aggregation in dynamic mode?

Yes

No

Resolved?

No

Yes

Contact H3C Support

10

a. Execute the display interface command to display the status of the member ports.

b. If the member ports are down, follow the solution in "Link up failure on a port" to

troubleshoot

the problem.

3. Verify that the member ports have the same attribute configurations and class-two configurations

as the reference port:

a. Execute the display current-configuration interface command to display the configurations of

the aggregate interface and the member ports.

b. Configure the member ports to make sure they have the same attribute configurations and

class-two configurations as the reference port.

4. Identify the aggregation mode of the aggregation group.

{ If the aggregation mode is static, proceed to step 6.

{ If the aggregation mode is dynamic, proceed to step 5.

5. Verify that the peer member ports have the same attribute configurations and class-two

configurations as the peer port of the reference port:

a. Execute the display current-configuration interface command on the peer device to display the

configurations of the peer member ports.

b. Configure the peer member ports to make sure the peer ports have the same attribute

configurations and class-two configurations as the peer port of the reference port.

6. Verify that the number of member ports in the aggregation group does not exceed eight.

a. Execute the display link-aggregation verbose command to verify that the number of member

ports does not exceed eight.

If the number of member ports exceeds eight, the ports with higher port numbers are in

Unselected state.

b. Use the undo port link-aggregation group command to remove undesired member ports from

the aggregation group.

This makes sure all member ports you assign to the aggregation group can become Selected.

7. If the problem persists, contact H3C Support.

Related commands

This section lists the commands that you might use for troubleshooting Ethernet link aggregation.

Commands Descri

p

tion

display current-configuration interface Displays interface configuration.

display interface Displays Ethernet interface information.

display link-aggregation verbose

Display detailed information about the

aggregation groups that correspond to the Layer

2 or Layer 3 aggregate interfaces.

13

Troubleshooting ports

This section provides troubleshooting information for common problems with ports.

Link up failure on a port

Symptom

A port cannot go up when the port is connected to another port.

Troubleshooting flowchart

Figure 4 Troubleshooting link up failure on a port

Solution

To resolve the problem:

Physically connected?

Shut down?

Check the port

connection

undo shutdown

No

Yes

No

Cable is correct or transceiver

module matches wavelength?

Replace the cable

or fiber

No

Yes

Subcard is operating correctly

if the interface is on a subcard?

Install the subcard

again or replace a

subcard

No

Yes

A port failed to go

up

End

Yes

Resolved?

No

Enable internal loopback

testing to examine the physical

port

Contact H3C Support

Resolved?

14

1. Verify that the physical connection of the port is correct:

a. Unplug and then plug in the network cable of the port.

b. Verify that the port is up.

2. Verify that the port is not shut down:

a. Execute the display interface brief command.

b. Check whether ADM appears in the second column of the output for the port.

c. If ADM appears, use the undo shutdown command to bring up the port.

3. Verify that the speed and duplex mode of the port match those of the peer port:

a. Execute the display interface brief command.

b. Check whether the speed and duplex mode of the port match those of the peer port.

c. If they do not match, use the speed command and the duplex command to set the speed and

duplex mode for the port.

4. Examine the network cable quality or verify that the transceiver module type of the fiber port

matches the wavelength:

a. Replace the network cable with a new one, and verify that the port is up.

b. If the port is a fiber port, verify that the transceiver module type of the fiber port matches the

wavelength.

If the transceiver module information is not on the label, use the display transceiver interface

command to display the transceiver module information.

<Sysname>display transceiver interface ten-gigabitethernet 1/1/1

Ten-GigabitEthernet1/1/1 transceiver information:

Transceiver Type : 10G_BASE_SR_SFP

Connector Type : LC

Wavelength(nm) : 850

Transfer Distance(m) : 80(50um),30(62.5um)

Digital Diagnostic Monitoring : YES

Vendor Name : FINISAR CORP.

Ordering Name : SFP_XGE_SX-MM850

5. If the port is on a subcard, verify that the subcard is operating correctly:

a. Execute the display device command.

b. Check whether Normal appears in the last column of the output for the subcard.

c. If Normal does not appear in the last column, re-plug in the subcard or replace the subcard

with a subcard of the same model.

[Sysname-GigabitEthernet1/0/2]display device

Slot 1

SubSNo PortNum PCBVer FPGAVer CPLDVer BootRomVer AddrLM Type State

0 52 Ver.B NULL 003 003 018 IVL MAIN Normal

1 4 Ver.A NULL 002 NULL IVL LSW1SP4P0 Normal

2 16 Ver.A NULL 001 NULL IVL LSW1GP16P0 Normal

3 1 Ver.A NULL 000 NULL IVL LSWM1IPS10 Normal

6. Enable internal loopback testing on the port to verify that the physical port is operating correctly.

[Sysname-GigabitEthernet1/0/2]loopback internal

%Apr 26 12:40:25:309 2000 60CPWR IFNET/4/LINK UPDOWN:

GigabitEthernet1/0/2: link status is UP

15

%Apr 26 12:40:25:531 2000 60CPWR IFNET/4/LINK UPDOWN:

GigabitEthernet1/0/2: link status is DOWN

Loop internal succeeded!

7. If the problem persists, contact H3C Support.

Related commands

This section lists the commands that you might use for troubleshooting ports.

Command Descri

p

tion

display device

Displays device information.

display interface brief Displays brief interface information.

display transceiver interface

Displays key parameters of the transceiver module

installed in an interface.

loopback internal Enables loopback testing on an Ethernet interface.

16

Troubleshooting other problems

Layer 2 forwarding failure

Symptom

Layer 2 packet loss occurs between two devices on the same network segment and in the same VLAN.

Troubleshooting flowchart

Figure 5 Troubleshooting Layer 2 packet loss failure

Incoming error packets?

No

Yes

Locate the

reasons of the

failure

End

No

Yes

Layer 2 packet loss

Packets filtered by

ACLs or QoS policies?

Locate the

reasons and solve

the failure

Port blocked?

No

Yes

Port misconfigurations?

No

Locate and modify

misconfigurations

Yes

Port congestion?

No

Locate and solve

congestion

Yes

Resolved?

No

Yes

Resolved?

Contact H3C Support

Locate the

reasons and solve

the failure

17

Solution

To solve the problem:

1. Verify that no error packets have been received on the local port:

a. Execute the display interface command and check for error packets.

<H3C>display interface GigabitEthernet1/0/36

GigabitEthernet1/0/36 current state: UP

IP Packet Frame Type: PKTFMT_ETHNT_2, Hardware Address: 000f-e200-002b

……

Last 300 seconds output: 0 packets/sec 10 bytes/sec 0%

Input (total): 57 packets, 7838 bytes

0 unicasts, 50 broadcasts, 2 multicasts, 0 pauses

Input (normal): 52 packets, - bytes

0 unicasts, 50 broadcasts, 2 multicasts, 0 pauses

Input: 5 input errors, 0 runts, 0 giants, 0 throttles

5 CRC, 0 frame, - overruns, 0 aborts

- ignored, - parity errors

b. If the statistics are not zero, the following failures might occur:

− Interface hardware failure—To test such a failure, connect the cable that is connected to the

local port to a correctly operating port (for example, Port A) with the same configurations as

the local port. If Port A forwards traffic correctly, you can determine that the hardware of the

local port fails. In this event, you must replace the local port with a correctly operating port.

− Transceiver module, fiber, or twisted pair failure—To test and solve such a failure, replace

the transceiver module, fiber, or twisted pair with a good one.

− Inconsistent configurations—Verify that the configurations (such as speed and duplex mode)

of the peer are consistent with the local port. If they are inconsistent, modify the

configurations of the local port.

c. If the problem persists, contact H3C Support.

2. Verify that packets are not mistakenly filtered out by ACLs:

a. Examine the ACL and QoS policy configuration for packet filtering on the port, on the VLAN of

the port, or globally. If packets are mistakenly filtered out, modify the ACL or QoS policy

configuration.

− To display the ACL configuration on the port for packet filtering, execute the display

packet-filter command.

− To display the QoS policy configuration on the port, execute the display qos policy

command.

− To display the QoS policy configuration on the VLANs of the port, execute the display qos

vlan-policy command.

− To display the global QoS policy configuration, execute the display qos policy global

command.

b. Examine whether packets are filtered out by automatically created ACLs.

The following features automatically create ACLs:

− IP source guard—Configured by using the ip source binding or ip verify source command.

To display source guard binding entries, execute the display ip source binding or display

18

ipv6 source binding command. If IP source guard is configured but the packets match no

entry, further troubleshoot the problem based on the way the binding entries are created.

− Portal authentication—When portal authentication is configured, the port discards the

packets of unauthenticated users. To display the portal configuration of the port or the

VLANs of the port, execute the display portal interface command. To cancel the portal

configuration on the port, execute the undo portal command in Layer 2 Ethernet interface

view. To cancel the portal configuration on the VLAN of the port, execute the undo portal

server server-name command on the corresponding VLAN interface.

− EAD fast deployment—When EAD fast deployment is enabled, the port discards packets of

unauthenticated users except when the users only access a free IP. To display whether EAD

fast deployment is enabled on the port, execute the display dot1x command.

− MFF—To display the MFF configuration information of the VLAN to which the port belongs,

execute the display mac-forced-forwarding vlan command. If the output does not contain

the gateway information, examine whether the ARP snooping or DHCP snooping

configuration is correct.

3. Verify that the port is not blocked:

{ Execute the display stp brief command to determine whether STP sets the state of the port to

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

disabling STP on the port, or configuring 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.

{ Execute the display rrpp verbose command to determine whether the port is down or RRPP sets

the state of the port to blocked. When the port is in down or blocked state, it cannot forward

traffic.

− If the port is in down state, examine whether the port is physically or administratively shut

down.

− If the port is in blocked state, find the reasons. For example, the roles of the primary and

secondary port on the master node are reversed, or the broadcast storm suppression

mechanism blocks the port because SRPT failure occurs in a multi-homed subring.

{ Execute the display smart-link group command to determine whether Smart Link sets the state

of the port to standby or down. When the port is in standby or down state, it cannot forward

traffic.

If the port is in standby state, set the port as the primary port.

If the port is in down state, the follow reasons might apply, and further troubleshooting is

required:

− The uplink device is configured with Monitor link, and its uplink is down.

− The link between the local port and its peer fails.

− The local port is administratively shut down.

4. Examine the following configurations that might cause packet loss:

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

whether the port is in the VLAN of the packets. If 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

19

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.

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

If congestion occurs, locate and solve the problem by referencing related congestion management

documents.

6. If the problem persists, contact H3C Support.

Related commands

This section lists the commands that you might use for troubleshooting Layer 2 packet loss failure.

Command Descri

p

tion

display interface Displays Ethernet interface information.

display packet-filter

Displays whether an ACL has been successfully

applied to an interface for packet filtering.

display qos policy

Displays user-defined QoS policy configuration

information.

display qos policy interface

Displays information about the QoS policies applied

to an interface or all interfaces.

display qos vlan-policy

Displays information about QoS policies applied to

VLANs.

display qos policy global Displays information about global QoS policies.

display this

Displays the running configuration in the current

view.

display ip source binding/display ipv6 source binding

Displays source guard binding entries.

display portal interface Displays the portal configuration of an interface.

display dot1x Displays information about 802.1X.

display mac-forced-forwarding vlan

Displays the MFF configuration information of a

VLAN.

display link-aggregation verbose

Displays detailed information about the aggregation

groups that correspond to the aggregate interfaces.

display rrpp verbose Displays detailed RRPP information.

display smart-link group

Displays information about the specified or all smart

link groups.

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H3C s5820x series, s5800 series Troubleshooting Manual

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