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H3C S6520X-HI Series Troubleshooting Manual Download Page 48

45 

Related commands 

This section lists the commands that you might use for troubleshooting Layer 3 forwarding failure. 

 

Command  

Description 

debugging arp packet 

Enables ARP packet debugging.

 

display arp 

Displays ARP entries. 

display

 

fib

 

Displays FIB entries 

display ip routing-table 

Displays the routing table. 

display mac

-

address

 

Displays MAC address entries 

 

Protocol flapping 

Symptom 

The switch cannot send or receive protocol packets. 

Troubleshooting flowchart 

Figure 22 Troubleshooting protocol flapping 

 

 

Solution 

To resolve the issue: 

1. 

Verify that Layer 2 is operating correctly, as described in "

Layer 2 forwarding failure

." 

2. 

Verify that Layer 3 is operating correctly, as described in "

Layer 3 forwarding failure

." 

Layer 2 packet loss occurs?

Layer 3 packet loss occurs?

Troubleshoot the 

problem

Resolved?

Troubleshoot the 

problem

Contact the support

Layer 3 protocol flapping

Yes

No

No

Yes

Resolved?

Yes

Yes

No

No

End

Software-related

packet loss occurs?

No

Yes

Collect diagnostic 

information

Summary of Contents for S6520X-HI Series

Page 1: ...reserved No part of this manual may be reproduced or transmitted in any form or by any means without prior written consent of New H3C Technologies Co Ltd Except for the trademarks of New H3C Technolog...

Page 2: ...an tray failure 9 Symptom 9 Troubleshooting flowchart 9 Solution 9 Related commands 10 Troubleshooting ACL 10 ACL application failure with an error message 10 Symptom 10 Troubleshooting flowchart 11 S...

Page 3: ...ubleshooting flowchart 30 Solution 30 Failure to send packets 32 Symptom 32 Troubleshooting flowchart 32 Solution 32 Related commands 33 Troubleshooting system management 34 High CPU utilization 34 Sy...

Page 4: ...hen you troubleshoot xxx follow these general guidelines To help identify the failure cause collect system and configuration information including Symptom time of failure and configuration Network top...

Page 5: ...es To more easily locate log information save log files to a separate folder for each member device and include their IRF member IDs in the folder names Table 1 Log and operating information Category...

Page 6: ...member device Display the diagnostic log file on the master device Sysname dir flash diagfile Directory of flash diagfile 0 rw 161321 Jul 11 2013 16 16 00 diagfile log 1038336 KB total 963860 KB free...

Page 7: ...r terminal enter n at the prompt The output from this command varies by software version Save or display diagnostic information Y save N display Y N N display clock 23 49 53 UTC Tue 01 01 2016 display...

Page 8: ...upport If an issue persists after you perform the troubleshooting procedures in this document contact H3C Support When you contact an authorized H3C support representative be prepared to provide the f...

Page 9: ...erating information If you cannot access the CLI go to step 2 2 Verify that the system software image on the switch is correct Log in to the switch through the console port and restart the switch If t...

Page 10: ...er module is in Fault state go to step 3 2 Remove and reinstall the power module to make sure the power module is installed securely Then execute the display power command to verify that the power mod...

Page 11: ...r command to verify that the power module has changed to Normal state in the new slot If the power module remains in Fault state replace the power module 4 If the issue persists contact H3C Support Ne...

Page 12: ...the new slot If the power module remains in Absent state go to step 4 3 Remove and install the power module into an idle power module slot Then execute the display power command to verify that the po...

Page 13: ...air outlet b If no air is being expelled out of the air outlet vents remove and reinstall the fan tray Then execute the display fan command to verify that the fan tray has changed to Normal state If...

Page 14: ...aining field for ACL resources insufficiency If this field displays 0 the ACL hardware resources are exhausted 2 To free hardware resources delete unnecessary ACLs 3 If the issue persists contact H3C...

Page 15: ...Command Interface display qos policy interface VLAN display qos vlan policy Global display qos policy global b If the QoS policy contains a class behavior association execute the display traffic class...

Page 16: ...packet filter If there is no configuration error 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...

Page 17: ...classifier count if match acl 3000 Sysname classifier count quit Sysname traffic behavior count Sysname behavior count accounting packet Sysname behavior count quit Sysname qos policy count Sysname q...

Page 18: ...match statistics for ACLs display diagnostic information Displays operating statistics for multiple feature modules in the system display packet filter Displays whether an ACL has been successfully a...

Page 19: ...hysical interfaces No Yes Resolved No Yes Yes No All IRF links meet the requirements Resolved No Yes Yes No Upgrade software to the same version in the fabric Resolved Yes No No Yes Same software vers...

Page 20: ...sical IRF ports 4 Verify that the IRF links meet the requirements For information about the interfaces that can be used as IRF physical interfaces see the switch installation guide or the IRF configur...

Page 21: ...ware version of the master device However the synchronization might fail when the gap between the software versions is too large For more information see the release notes 7 If the issue persists cont...

Page 22: ...ation This section provides troubleshooting information for common issues with Ethernet link aggregation Link aggregation failure Symptom Some member ports fail to be placed in Selected state and link...

Page 23: ...all physical connections are correct You can verify the physical connections against your network plan 2 Verify that all member ports are up a Execute the display interface command to display the stat...

Page 24: ...n the aggregation group does not exceed the configured maximum number of Selected ports a Execute the link aggregation selected port maximum command to set the maximum number of Selected ports allowed...

Page 25: ...section provides troubleshooting information for common port issues Fiber port remains in down state Symptom A fiber port remains in down state Troubleshooting flowchart Figure 11 Troubleshooting fib...

Page 26: ...e are operating correctly a Use the display transceiver alarm interface command to display the alarms present on the transceiver module The device displays None if no error occurs The device displays...

Page 27: ...of the peer port b If they do not match use the speed command and the duplex command to set the rate and duplex mode for the port 2 Verify that the cable is operating correctly a Use a cable that has...

Page 28: ...1 This transceiver is NOT sold by H3C H3C therefore shall NOT guarantee the normal function of the device or assume the maintenance responsibility thereof Troubleshooting flowchart Figure 13 Troubles...

Page 29: ...bitEthernet1 0 1 transceiver device a0 register information 0000 03 04 07 00 00 00 02 00 0008 00 00 00 03 0d 00 64 00 0010 00 00 00 00 48 69 73 65 0018 6e 73 65 20 20 20 20 20 0020 20 20 20 20 00 00 0...

Page 30: ...the transceiver module is an H3C transceiver module If it is not replace it with an H3C transceiver module 2 Execute the display transceiver interface command to save the transceiver module informati...

Page 31: ...entify the error frame type a Optional Use the reset counter interface command in user view to clear the packet statistics of the port This command resets the values of each statistical field to 0 so...

Page 32: ...ing correctly 3 Verify that the port configurations are correct a Execute the display interface brief command b Determine whether the speed and duplex mode of the port match the speed and duplex mode...

Page 33: ...s the peer port and the link are correct but the issue persists perform the following tasks a Use the display diagnostic information command to collect the diagnostic information b Contact H3C Support...

Page 34: ...the port is not in the discarding state e If a port is set to the discarding state by STP examine and modify the STP related configurations to resolve the issue As a best practice configure the port...

Page 35: ...1 Examine the packet statistics of the port a Optional Use the reset counter interface command to clear the packet statistics of the port This command resets the values of each statistical field to 0...

Page 36: ...ommand to verify that the status of the port is Selected g If the status of the port is Unselected the port cannot send or receive data packets h Determine the reasons why the port becomes Unselected...

Page 37: ...buffer display stp brief Displays brief spanning tree status and statistics display transceiver alarm interface Displays the current transceiver module alarms display transceiver diagnosis Displays t...

Page 38: ...5Min Name 1 0 0 0 0 0 0 scmd 2 0 0 0 0 0 0 kthreadd 3 0 0 0 0 0 0 migration 0 4 0 0 0 0 0 0 ksoftirqd 0 5 0 0 0 0 0 0 watchdog 0 6 0 0 0 0 0 0 migration 1 7 0 0 0 0 0 0 ksoftirqd 1 8 0 0 0 0 0 0 watch...

Page 39: ...7 Attaching to process 17 khubd Iteration 1 of 5 Kernel stack c01d54a8 hub_thread 0x88c 0xa64 c006ce28 kthread 0xfc 0x12c c00588d0 do_exit 0x0 0x818 ffffffff 0xffffffff Iteration 2 of 5 Kernel stack c...

Page 40: ...wchart Figure 19 Troubleshooting high memory utilization Solution To resolve the issue 1 Execute the display system internal kernel memory pool command multiple times to identify the memory portions t...

Page 41: ...determine whether there is an issue with the memory portion you must observe the capacity change and change speed of a memory portion for a period of time The memory leak process might be slow and yo...

Page 42: ...ayer 2 forwarding failure Symptom Layer 2 packet loss occurs when the switch forwards packets to a peer on the same network segment and in the same VLAN Troubleshooting flowchart Figure 20 Troubleshoo...

Page 43: ...100 Unicast max ratio 100 PVID 1 MDI type Automdix Port link type Access Tagged VLANs None Untagged VLANs 1 Port priority 0 Last link flapping Never Last clearing of counters Never Peak value of inpu...

Page 44: ...vlan policy command To display the global QoS policy configuration execute the display qos policy global command b Verify that packets are not filtered out by ACLs automatically created by some featu...

Page 45: ...t 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 pa...

Page 46: ...urce guard binding entries display portal interface Displays portal configuration and portal running state on an interface display dot1x Displays information about 802 1X display link aggregation verb...

Page 47: ...locate the issue b Execute the display mac address command to verify that the output interfaces in the MAC address entries and ARP entry are the same If the output interfaces are not the same execute...

Page 48: ...cannot send or receive protocol packets Troubleshooting flowchart Figure 22 Troubleshooting protocol flapping Solution To resolve the issue 1 Verify that Layer 2 is operating correctly as described i...

Page 49: ...1 IPV4_MC_OSPF_5 0 0 0 100 S On SMAC 8 512 12 IPV4_MC_OSPF_6 0 0 0 100 S On SMAC 8 512 13 IPV4_UC_OSPF 0 0 0 200 S On SMAC 8 512 14 IPV4_MC_PIM 0 0 0 100 S On SMAC 8 512 15 IPV4_UC_PIM 0 0 0 100 S On...

Page 50: ...h Sysname system view Sysname switch mode 0 NORMAL MODE default 1 VXLAN MODE 2 802 1BR MODE Sysname switch mode 1 Reboot device to make the configuration take effect Sysname quit Sysname reboot Start...

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